Indonesia Conference Directory

Corresponding Author
Hartatiek Hartatiek

Institutions
Department of Physics
Universitas Negeri Malang

Abstract
Polyvinyl alcohol (PVA)/Hydroxyapatite (HAp) composite nanofiber was obtained by electrospinning technique using a PVA polymer solution. Variations in the composition of PVA /HAp composite are (100: 0, 90:10, 85:15, 80:20, 75:25, 70: 30 %v). The PVA/HAp composite nanofiber was analyzed including nanostructure, porosity and tensile strength. The characterization of nanostructures using scanning electron microscopy (SEM) showed that the average diameter in the range of 173-234 nm, porosity in the range of 68-77%. The tensile strength test showed that the strain was in the range of 106.9 - 125.5% and tensile strength in the range of 9.77 - 15.85 MPa. This characteristic of PVA/HAp composite nanofiber can be applied as a scaffold in bone tissue engineering.

Keywords
nanostructure, porosity, tensile strength, polyvinyl alcohol, hydroxyapatite, nanofiber

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/djqvFD8u4baP

Corresponding Author
Irwanto Irwanto

Institutions
Department of Electrical Engineering Vocational Education, UNTIRTA, Indonesia

Abstract
Information needs for ones color perception are needed in the fields of medicine, engineering, astronomy, biomedicine and so on. The demand for accurate assessment of color perception must be met by the perception detection tool used. Ishiharas test, as a perception detection tool that is still used today has insufficient accuracy. This research aims to create a system that can detect a shift in ones color perception, relative to the average color perception of a number of respondents. Through plotting the respondents perception points, in the CIE coordinate system (Commission International de IEclairage) XYZ can be calculated the average euclidean distance, ED, relative to the reference point and the distribution of x and y groups of perception points around the point of reference. Both size, euclidean distance and distribution are used as indicators of average color perception so that an assessment of ones color perception is given based on the results of comparison between color perception points and color perception indicators. The tool used to do the test is Delphi version 7.0 software. the research material used is the RGB (Red, Green, Blue) color image format. The results of a persons color perception study are divided into three levels, namely: (1) "normal" assessment if euclidean (ED) perceptions are smaller than the euclidean (ED) average (2) the "somewhat normal" assessment if the distribution of x and y is smaller rather than the color of perception and the distribution of x and y (3) the assessment is "abnormal" if the color of perception is greater than the max distribution of x and y. A new perception point assessment that is in level one is used to up-date prevailing perception indicators. Up-dating condition constraints affect the quality of the threshold average perception specifically and the quality of the results of the perception detection system in general.

Keywords
Colour Perception, Spectral Characterictics, Detection Model

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/vWQzeBZdN9CL

Corresponding Author
Agus Jatmiko

Institutions
(1) Department of Materials Engineering, Faculty of Mechanicals and Aerospace Engineering, ITB
(2) Research Center for Nanoscience and Nanotechnology, ITB
(3) Department of Engineering Physics, Faculty of Technological Industry, ITB (*Corresponding author: purwa[at]tf.itb.ac.id)

Abstract
Alzheimer is a disease that slowly destroys memory and cognitive ability. There are 46 million Alzheimer patients around the world and 22 million of them are in Asia. The number of Alzheimer’s patients are expected to increase fourfold in 2050. Magnetic Resonance Imaging (MRI), with contrast agent can be used as early detection of this disease. However, enzyme ligand that used for MRI media contrast is neurotoxic. On the other hand, research on PET contrast agent used dimethylaminobenzyl ligand has not widely studied yet. This contrast agent is a promising alternative of ligand because it will be able to interact with Amyloid protein. The strategy of this research is to design magnetite-based MRI contrast coated with dimethylaminobenzyl-chitosan as its ligand. The modified chitosan showed a new peak at 353 nm in UV-Vis result compared with normal chitosan. This result proved that chitosan was modified by dimethylaminobenzaldehyde. FTIR spectrum of encapsulated nanoparticles indicated strong spectrum of iron oxide and 1,4 disubstituted benzene. XRD analysis shows that the nanoparticle formed is D-Magnetite with crystal size 13 + 4 nm. Lastly TEM image shows dark spheres inside the membrane. While, XRD analysis result showed that the size of dark sphere is 12 + 4 nm, which is in range of crystal size for magnetite. Gyration radius of modified chitosan is 6 nm and very close to the thickness of the membrane. This result proved that the modified chitosan is encapsulating the magnetite.

Keywords
Alzheimer, Amyloid-β, β-sheet, MRI contrast agent, Fe3O4 nanoparticles, modified chitosan

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/hEdGZJ7PnaTp

Corresponding Author
Wahyu Dwi Handoko

Institutions
1Departement of Physics, Faculty of Sciences
Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia

2Departement of Chemistry, Faculty of Sciences
Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia

3Departement of Physics Education, Faculty of Teacher Training and Education
University of Palangka Raya, Palangka Raya, Indonesia

4Departement of Physics, Faculty of Mathematics and Natural Sciences
University of Palangka Raya, Palangka Raya, Indonesia

Abstract
A stacked sieve tool has been made to sort natural sands which will ultimately be used to produce functional materials such as zircon, zirconia, LFP, and polymer-based composite fillers. This stacked sand sieve was intended to replace conventional sieves that had several disadvantages, including unstable speed, inefficient time in processing large amounts of sand and relatively greater costs incurred. This stacked sieve exhibited the following characters: 1) composed of two sieves, 2) can be assembled easily to change the size of the sieve, 3) had 3 variations of the sieve slope, and 4) used a gasoline motor to produce a sift speed of 25 cm/s and 36 cm/s. The sieve slopes were manually adjusted by positioning the sieves according to the available slots on the device. The sizes of the filter on the sieves made were 1, 3 and 5 mm. The effectiveness of the stacked sieve was tested using a 50 kg ordinary natural sand. The test results showed that the sieve product increased if it used a speed of 25 cm/s. Furthermore, the maximum sieve yield was obtained if the upper and lower sieves were at the same slopes, which was 38˚, and their sizes were 5 and 1 mm respectively, which was 0.82 kg/s. Keyword: natural sand; stacked siever; siever slopes; siever speed

Keywords
natural sand; stacked siever; siever slopes; siever speed

Topic
Minerals and Complex Materials

Link: https://ifory.id/abstract/X7Nc3rzmG2dx

Corresponding Author
Nadiya Miftachul Chusna

Institutions
(a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia
(b) Research Center of Minerals and Advanced Materials, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5 Malang 65145, Indonesia
*sunaryono.fmipa[at]um.ac.id

Abstract
Series of ferrogel samples have been successfully fabricated by using the freezing-thawing role. The filler used in ferrogel is magnetic material of Mn0.25Fe2.75O4/Ag which is synthesized by the co-precipitation method and chemical reduction. Whereas, the matrix used in ferrogel is a polymer composite of Carboxymethyl Cellulose (CMC) and Polyvinyl Alcohol (PVA). The characterization of Mn0.25Fe2.75O4/Ag powder was carried out by using X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Vibrating Sample Magnetometer (VSM), and antibacterial activities. While the Mn0.25Fe2.75O4/Ag-CMC / PVA ferrogel was successfully characterized by antibacterial activity using the agar diffusion method. The XRD pattern of the powder of Mn0.25Fe2.75O4/Ag illustrates the peaks owned by Fe3O4 and silver phases. The morphology of the Mn0.25Fe2.75O4/Ag powder using TEM characterization shows the particles size of the Fe3O4 and Ag is 5.03 and 4.34 nm respectively. Meanwhile, the magnetization hysteresis curve of Mn0.25Fe2.75O4/Ag showed a decrease from 20.74 emu / g to 15.53 emu / g along with the addition of Ag material. Through the agar diffusion method, samples of Mn0.25Fe2.75O4/Ag powder and Mn0.25Fe2.75O4/Ag -CMC/PVA ferrogel showed excellent antibacterial activity as indicated by the widening of zones that were not overgrown with bacteria around the sample. Thus, the Mn0.25Fe2.75O4/Ag powder and Mn0.25Fe2.75O4/Ag-CMC/PVA ferrogel is potential for use in the biomedical field.

Keywords
ferrogels; magnetic properties; antibacterial; chemical reduction

Topic
Functional Materials

Link: https://ifory.id/abstract/MZugEKtyxh9D

Corresponding Author
Fakhrotun Nisa

Institutions
a) Department of Chemistry, Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia
*nfakhrotun[at]gmail.com

Abstract
Oxovanadium(IV) complexes with nitrogen donor ligand have been reported such as [VO(bpy)₂]SO₄ and [VO(phen)₂]SO₄. Generally, the complexes used bidentate N,N ligands. On the other side, tridentate ligands can increase the stability of complexes due to chelate effect. So in this study, two vanadyl complexes with nitrogen donor tridentate ligands have been synthesized namely 2,2,2",6-terpyridine and 2,6-bis(pyrazol-3-yl)pyridine. The difference between the two ligands is the two pyridine rings at terpyridine replaced by the pyrazol ring. These complexes have been synthesized from VOSO₄ and the ligand with 1:1 mole ratio. The dark green and light blue solid products obtained with 84% and 80% yields. Elemental analysis result showed 44.62% C, 3.07% H, 10.99% N, and 7.55% S (calculated: 44.41% C, 3.20% H, 10.36% N, and 7.89% S) indicating the formula of C₁₅H₁₁N₃O₅SV.½H₂O or [VO-terpy]SO₄.½H₂O. The other result is 31.12% C, 3.31% H, 16.51% N, and 7,46% S (calculated: 30.84% C, 3.50 % H, 16.35% N, and 7.47% S) for C₁₁H₉N₅O₅SV.3H₂O or [VO-bpp]SO₄.3H₂O. Both oxovanadium(IV) complexes are 2:2 electrolytes based on molar conductivity values of 238 and 212 S cm² mol⁻¹ respectively. The appearance of 150 amu and 139 amu peaks in the ESI-MS spectra were giving evidence of cationic complexes. Thermal stability of complexes were analyzed by TG. These complexes are paramagnetic because their magnetic moment values of 1.73 BM and 1.69 BM due to the presence of one unpaired electron. Interestingly, [VO-bpp]SO₄.2½H₂O complex has a thermochromic effect.

Keywords
Vanadyl complexes; Tridentate ligand; Terpyridine ligand; Bpp ligand

Topic
Minerals and Complex Materials

Link: https://ifory.id/abstract/nNqXP4Vy7rEQ

Corresponding Author
Yunita Anggraini

Institutions
(a) Magnetic and Photonic Research Group, Dept. of Physics
Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia
*nita.anggr[at]students.itb.ac.id

Abstract
The role of anion and alkyl chain length of cation on the thermophysical properties of imidazolium-based ionic liquid have been studied. The data were obtained from references and the NIST database. The studied parameters consist of melting temperature (Tm), glass transition temperature (Tg), decomposition temperature (Td), and enthalpy of fusion (∆Hm). The variations of Tm with anions in [C16Mim][A] with A= Br, Cl, BF4, PF6, and TFO are generally decreased with increasing anion radius, except for A= PF6, due to strong hydrogen bonds for the sake of an F atom. The values of critical temperatures (Tm, Tg, and Td) generally show a strong variation with the number of carbon atom or alkyl chain length (the number of n in [CnMim][A] for A = BF4, NTf2, and PF6). The variation of Tm in the number of n shows the non-monotonous variations. This characteristic is the result of the combination of interaction potentials in the crystalline and liquid phases. The variation of Tg in the number of n shows even-odd alternation, presumably due to competition between electrostatic and van der Waals forces. Many kinds of ILs have a relatively high value of Td, which means that it can be kept in the liquid state above 400 °C, which makes them have excellent catalytic activity and dynamic properties. The variation of Td with n looks different with Tm. It is seemingly that the variation of ∆Hm with n follows the Tm. This behavior in accordance with the thermodynamic relation between ∆Hm, Tm, and entropy (S) of the system.

Keywords
Ionic liquid, Imidazolium, melting temperature (Tm), glass temperature (Tg), decomposition temperature (Td), heat of fusion (∆Hm)

Topic
Functional Materials

Link: https://ifory.id/abstract/gBQWYNwDLnhy

Corresponding Author
Dian Ahmad Hapidin

Institutions
Institut Teknologi Bandung

Abstract
Nebulizers are commonly used device for generating aerosols. In medical fields, the medical-grade nebulizers are used as drug delivery via inhalation. This involves the aerosolization of drugs in solution or suspension forms. In aerosol research field, commonly laboratory-grade nebulizers have a slightly different design to those of medical nebulizers as they optimize the aerosol generation stability and production rate with less deposition. This paper will discuss the utilization of medical grade nebulizer to generate aerosol from various solutions and suspension, which are usually used in aerosol research, i.e. NaCl, gliserin, dioctyl sebacate (DOS), and polystyrene latex (PSL). The size distribution of the aerosol was measured using scanning mobility particle sizer (SMPS). We found that the concentration of NaCl and gliserin solutions directly affected the geometrical mean diameter (GMD) and geometrical standard deviation (GSD) of the generated aerosol. The test using PSL particles depicted that the medical nebulizer had a relatively high aerosol deposition, which increased the suspension concentration over time.

Keywords
Aerosol, Nebulizer, Monodisperse, Polystyrene latex

Topic
Synthesis and Characterization Techniques

Link: https://ifory.id/abstract/crpUgq3mwYuJ

Corresponding Author
Husain Ahmad

Institutions
a) Department of Physics, Faculty of Sciences, Institut Teknologi Sepuluh Nopember (ITS), Surabaya, Indonesia.
b) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Makassar (UNM), Makassar, Indonesia.
c) Department of Physics, Faculty of Mathematics and Natural Science, Universitas Palangka Raya, Palangka Raya, Indonesia.
d) Synchrotron Light Research Institute (Public Organisation), Nakhon Ratchasima, Thailand.
*suminar_pratapa[at]physics.its.ac.id

Abstract
The technical aspect of EXAFS fitting data analysis has been studied. This paper presents a comparison of the technical EXAFS data analysis using Artemis software. A set of EXAFS data from magnetite/silica core-shells was used for the benchmarking. Three approaches of analysis will be discussed in this paper namely approach A, B, and C. The analysis will only be focused on the fitting process of experimental and model data. The technical analysis of the approach A was that the selection of the photoelectron scattering path was chosen only the single scattering and all of the fitting parameters was used “guess” action. Meanwhile, approach B was similar to approach A, but k and r parameters from the Fourier transform were manually adjusted to obtain a better fitting result. The disadvantages of these two approaches are: (1) the experimental data might be formed by single and multiple scattering, (2) the action to fitting the parameters might not only “guess” because the software does not have the physical sense to the resulting values, and (3) the Fourier transform parameters should be correctly chosen before the fitting process. In the last approach, C, we demonstrated how the analysis should be performed to acquire reasonable results. The scattering path should be chosen by matching with the peak position of the experimental data. Moreover, the scattering paths might be single or multiple. Lastly, the action fitting parameters not only “guess” but can also be “edit”, “deff” etc. depending on the values and fitting results.

Keywords
EXAFS data analyses; Artemis software; EXAFS data; Scattering path; fitting parameters.

Topic
Synthesis and Characterization Techniques

Link: https://ifory.id/abstract/V4RAnDTP6FvE

Corresponding Author
Friska Hasugian

Institutions
Department of Chemistry, Bandung Institute of Technology
Ganesha Street 10, Bandung 40132, Indonesia friskahasugian100[at]gmail.com

Abstract
4,7 diazadecanediamide ligand is a ligand that has 4 Nitrogen atoms and 2 Oxygen atoms as donor atoms. This ligand has two amide groups which are capable of rearranging from Ni-O to Ni-N when reacting with the central ion Ni (II) so that it can form 2 different complex structures namely [Ni(C8H18N4O2)(H2O)2]2+and [Ni(C8H16N4O2)].3H2O. This ligand also reacts with central ion Cu (II) to form complexes [Cu(C8H18N4O2)(Cl)]+ and [Cu2 (C8H18N4O2)2(C2H8N2)2]Cl4. Then synthesizing the VO (II) complex with 4,7 diazadecanediamide ligand by mixing 0,95 g (4,37 mmol) solid of VOSO4.3H2O in 1 ml of water and 0,9 g (4,45 mmol) ligand in 20 ml hot ethanol. The green complex precipitate formed was filtered, washed and dried in a desiccator containing silica gel and then weighed and obtained a precipitated mass of 1,22 g. The precipitate was analyzed and obtained data on levels of C, H, N and S as follows: C 17,55% (17,02); H 4,80% (3,90); N 10,10% (9,92) and S 9,71% (11,34). Data in parentheses are theoretical calculation data from the complex VO(II). The result of the TGA measurement shows complexes containing two hydrate molecules. The result of FTIR spectrum measurement indicates the presence of new bond formed in the complex, namely the V-N bond observed at wave number 603 cm-1. The vanadyl complex formed has a chemical formula [(VO)2(C8H18N4O2SO4).2H2O], Mr=564 g/mol). The complex is paramagnetic, with a spin only magnetic moment value of 2.02 BM.

Keywords
vanadyl, diazadecanediamide

Topic
Minerals and Complex Materials

Link: https://ifory.id/abstract/t7ne3TuZPJKH

Corresponding Author
Dhewa Edikresnha

Institutions
a)Departement of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

b)Research Center of Bioscience and Biotechnology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

c)Department of Pharmaceutics, School of Pharmacy, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

Abstract
Electrospinning was employed to produce composite fibers mat consisting of PVP (polyvinylpyrrolidone)/CA (Cellulose Acetate) and Garlic Extract. The electrospun nanofiber mats for all variations show uniform and beaded free fibers. The average fiber diameter of composite fiber decreased along with the increasing applied voltage. The broad FTIR peak representing the stretching vibrations of O-H in hydroxyl groups of phenols and the sharp peak at 1014 cm-1 is the characteristic peak of garlic extract, which indicates the existence of S=O group and proving the presence of organosulfur compounds such as alliin, allicin dan diallyl disulfide. The characteristic peak shifted to a higher wavenumber after being synthesized into fibers. During the electrospinning process, the condition of cone jet in the tip of the needle was recorded and it was confirmed that when the applied voltage was from 12 to 14 kV there is intermittent squirt of solution indicating that the removal rate of the solution due to the applied voltage is smaller than the feed rate of solution. The concentration of garlic extract in the fibers was also examined and it was found that fibers with larger diameter contained larger concentration of garlic extract.

Keywords
Nanofibers, Polyvinylpyrrolidone, Cellulose Acetate, Garlic Extract, Electrospinning, Composite,

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/jq3T7CPFEGLM

Corresponding Author
Rakhmawati Muliana Putri

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia
*) ferry[at]fi.itb.ac.id
b) Department of Chemistry, Universitas Pertamina, Jalan Teuku Nyak Arief, Simprug, Jakarta 12220, Indonesia
c) National Center for Sustainable Transportation Technologi, Istitut Tekniologi Bandung, Jl. Ganesha 10, Bandung 40132, Indonesia
d) Research Center for Nanosciences and Nanotechnology (RCNN), Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132, Indonesia

Abstract
Polyethylene oxide (PEO) is a polymeric material that has been widely used as solid polymer electrolytes (SPEs) for all-solid lithium ion battery (LIB) due to its excellent chemical stability. However, its low ionic conductivity at room temperature can be a significant problem that hampers the performance of the LIBs. Polyvinyl alcohol (PVA), due to its amorphous structure, is one of the polymers that is expected to improve the ionic conductivity of SPEs. In this study, we added polyvinyl alcohol (PVA) as a composite polymer to PEO based SPEs, with a varied amount of LiOH. The homogeneous solution was cast to form a thin and transparent SPE membrane. Characterization by X-Ray Diffraction (XRD) revealed the semi-crystalline properties of all samples. Ionic conductivity of SPEs composites was determined through AC impedance measurement using Electrochemical Impedance Spectroscopy (EIS). Among all samples that were studied, the sample with 4 wt. % LiOH revealed the highest ionic conductivity that reached 2.18 × 10-5 S.cm-1 at room temperature.

Keywords
lithium ion batteries (LIBs), solid polymer electrolytes (SPEs), polyethylene oxide (PEO), polyvinyl alcohol (PVA)

Topic
Minerals and Complex Materials

Link: https://ifory.id/abstract/pf4Y9zCnkmTW

Corresponding Author
Dhewa Edikresnha

Institutions
a)Departement of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

b)Research Center of Bioscience and Biotechnology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

c)Department of Pharmaceutics, School of Pharmacy, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

Abstract
By means of electrospinning, composite fibers mat built from PVP (polyvinylpyrrolidone) and CA (Cellulose Acetate) with garlic extract as active agent and glycerin as additive has been successfully produced. The electrospun nanofiber mats for all variations show some cluster with branches of fibers as the effect of glycerin. The average fiber diameter of composite fiber decreased along with the increasing applied voltage from 12 to 15 kV. However, the average diameter reduced when the applied voltage increased afterwards. In the FTIR study, a sharp peak at 1014 cm-1 as the characteristic peak of garlic extract, which attributes to the existence of S=O group and proving the presence of organosulfur compounds such as alliin, allicin dan diallyl disulfide, was found. In the composite fibers of PVP/CA/Glycerin/Garlic, the characteristic peak of garlic shifted to a higher wavenumber 1036 cm-1.

Keywords
Polyvinylpyrrolidone, Cellulose Acetate, Glycerin, Garlic Extract, Electrospinning, Composite Fibers

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/uwrUbRPLtNah

Corresponding Author
Masruroh Masruroh

Institutions
Department of Physics, Faculty of Mathematics and Natural Science, Brawijaya University, Jln. Veteran, Malang 65145, Indonesia

Abstract
Nitrogen plasma treatment of a polystyrene layer in a vacuum chamber resulted in changes in its hydrophobicity properties. The purpose of this work was to investigate the effect of chamber pressure on nitrogen plasma treatment on the hydrophobicity properties of polystyrene surfaces. The plasma character was diagnosed by optical emission spectroscopy (OES) determining the plasma parameters, i.e. electron temperature (Te) and the electron density (Ne). Boltzmann plot method, ratio, and Stark Broadening were utilized to calculate the parameters. The hydrophobicity properties of polystyrene surfaces were measured by contact angle measurements, and polar groups studied with FTIR. The plasma diagnostic results showed that higher the chamber pressure resulted in greater intensity of the emission spectrum. The spectrum exhibits the highest intensity at the wavelength of 385.715 nm, indicating the existence of NII or N2+ ion species. The increase of the chamber pressure declined the electron temperature but increased the electron density. Results of the FTIR measurements indicated the presence of the new CH3 groups that are polar groups causing the surface to change characteristic, from hydrophobic to hydrophilic.

Keywords
Diagnostic plasma, chamber pressure, Electron Temperature, Electron Density, and polar groups.

Topic
Synthesis and Characterization Techniques

Link: https://ifory.id/abstract/H9tcvBNJqYRk

Corresponding Author
Lila Dina Wulansari

Institutions
(a) Department of Physics, Faculty of Science, Institut Teknologi Sepuluh Nopember (ITS), Sukolilo, Surabaya 60111, Indonesia
*suminar_pratapa[at]physics.its.ac.id
(b) Laboratory of Biocomposites Technology, Institute of Tropical Forestry and Forest Product, Universiti Putra Malaysia, 43400 UPM

Abstract
Polyethylene glycol (PEG)/zircon (ZrSiO4) composites with various zircon sizes have been fabricated using liquid method. The study was aimed to enhance the thermo-mechanical properties of the PEG matric around its glass temperature. The zircon powder were prepared varying the calcination temperatures, i.e. 500 ºC, 1000 ºC, and 1200 ºC and were analyzed using FTIR and XRD. The powders exhibited pure zircon, increase of particle size and decrease of lattice parameter by increasing calcination temperature. Meanwhile, the PEG/zircon composites and the pure PEG sample have been analyzed using FTIR, XRD, and DMA. Analyses of the FTIR and XRD data confirmed the successful synthesis of the composites. DMA analysis revealed the storage moduli, loss moduli, and tan delta characters from the PEG/zircon composites. The maximum storage moduli and glass transition temperature (Tg) were achieved by the 5 wt% zircon calcined at 500 ºC, while the maximum loss moduli were achieved by the 5 wt% zircon calcined at 1200 ºC.

Keywords
Dynamic-mechanical properties; PEG/zircon; Glass transition; Storage and loss moduli

Topic
Synthesis and Characterization Techniques

Link: https://ifory.id/abstract/eWYZdyfmqG7U

Corresponding Author
Septia Refly

Institutions
(a) Department of Physics, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia
(b) Department of Chemistry, Universitas Pertamina, Jl. Teuku Nyak Arief, Simprug, Jakarta 12220, Indonesia
(c) National Center for Sustainable Transportation Technology, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia
(d) Research Center for Nanoscience and Nanotechnology, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia
*ferry[at]fi.itb.ac.id

Abstract
Dealing with the high price of lithium-ion batteries (LIBs) constituent materials, researchers around the world are seeking for the new source to assure sustainability of battery production. Valuable metals from spent LIBs can be used as a secondary source for LIB cathode production, which can be recovered through metal extraction in the form of acid leaching process of the cathode material. This action is not only economically beneficial but also able to reduce environmental and health hazards due to heavy metals contained in LIBs waste. In this study, citric acid was used as a leaching agent to extract Li, Co, Ni, and Mn metals from the active material cathode LiNi1/3Co1/3Mn1/3O2 (NCM 111). The addition of sucrose as a reducing agent was able to increase leaching efficiency, indicated by the increase of metal ion concentration in the filtrate. Based on this study, optimal conditions of the leaching process are the citric acid concentration of 1.2 M, reaction temperature of 80 ⁰C, reductant dosage of 0.5 g/g, the reaction time of 90 minutes, stirring speed of 400 rpm and solid to liquid ratio of 20 g/L. Transition metal ions in the filtrate are then co-precipitated to obtain salt precipitate through oxalate co-precipitation process. The dried precipitate had a crystalline structure of MC2O4⋅2H2O (M = Co, Mn, Ni), as was confirmed by XRD analysis. Organic acids leaching and oxalate co-precipitation process were able to recover valuable metals from spent LIBs through an environmentally friendly procedure.

Keywords
Lithium ion batteries (LIBs), NCM 111, Recycle, Citric acids, Oxalate co-precipitation

Topic
Functional Materials

Link: https://ifory.id/abstract/zVJ9Q4PARCDF

Corresponding Author
Yayat Iman Supriyatna

Institutions
(1) Research unit for Mineral Technology - Indonesian Institute of Sciences
(2) Metallurgical and Material Departement - University of Sutan ageng Tirtayasa
(3) Phisics Major - Lampung University

Abstract
AISI 1020 steel is widely applied as the main material for construction and piping systems on ships. This research was conducted to investigate the effect of electroplating Cu-Mn current density on the corrosion rate of AISI 1020 steel in a 3% NaCl corrosive medium. Corrosion rate testing was carried out using the weight loss method with immersion of samples in a corrosive NaCl medium for 168 hours and variations in current densities of 35, 45, 55, 65 and 75 mA/cm2. The results showed that the greater current density applied the lower corrosion rate. This is because an increase in electroplating current density will also increase Cu and Mn ions deposited in steel, where deposits of these ions will improve the corrosion resistance of steel. The lowest corrosion rate was obtained at 0,053 mm/y at a current density of 75 mA/cm2. XRD characterization results showed that peaks formed at current densities of 35 mA/cm2 are almost the same as the results of steel characterization after electroplating current density of 75 mA/cm2, but with a lower intensity. The results of the metallurgical microscope analysis show that the formed layer is thicker with increasing electroplating current density.

Keywords
corrosion rate, current density, electroplating, NaCl, Cu-Mn

Topic
Minerals and Complex Materials

Link: https://ifory.id/abstract/YpGMtkanJNrm

Corresponding Author
Muhammad Anshory

Institutions
(a) Departement of Physics, Universitas Gadjah Mada, Sekip Utara BLS 21, Yogyakarta 55281, Indonesia
*adib[at]ugm.ac.id
(b) Research Center for Physics, Indonesian Institute of Sciences (LIPI), Tangerang Selatan 15314, Indonesia

Abstract
Recently, two-dimensional (2D) materials have been studied due to its unique properties and potentials for electronic devices. Tin Selenide (SnSe) is a promising material to be developed in many fields by identifying its electronic structure. In this study, we investigate the effect of layer-dependent electronic properties of SnSe using first-principles calculations based on density functional theory (DFT). We firstly optimized layer dependent of the lattice constant and atomic distortion and then calculate the electronic structure-related parameter including band structure and density of electron (DOS). We find that the calculated band gap decreases with increasing the layers of SnSe which is not dependent on fully relativistic calculation by turning spin orbit coupling (SOC). However, we identify substantial spin splitting in the band structure under the presence of the SOC, making this multilayer is promising for spintronics.

Keywords
SnSe; spin splitting; layer-dependent; density-functional theory

Topic
Theoretical and Analysis in Materials

Link: https://ifory.id/abstract/bVyRtn9HN8CE

Corresponding Author
Erric Wijaya

Institutions
STIE Indonesia Banking School Jakarta

Abstract
Penelitian ini bertujuan untuk mendeskripsikan penerapan CAPM (Capital Asset Pricing Model) dalam pemilihan saham untuk melakukan investasi. Investasi di pasar modal umumnya memiliki tingkat pengembalian yang lebih tinggi dibandingkan dengan investasi di pasar uang. Investor terkadang kesulitan menentukan saham mana yang akan menghasilkan return yang besar dengan risiko yang kecil. Mendeskripsikan penerapan CAPM dengan cara mengelompokan saham-saham sektor perbankan yang efisien dan tidak efisien berdasarkan metode CAPM. Metode penelitian yang digunakan dalam penelitian ini adalah model CAPM yaitu untuk melihat return dan risiko yang relevan, serta untuk mencari estimasi tingkat keuntungan yang diharapkan oleh investor (expected return) pada setiap aset apabila pasar modal dalam keadaan seimbang. Metode dalam pemilihan sample adalah purposive sample method dan menghasilkan 40 perusahaan sektor perbankan terdaftar di Bursa Efek Indonesia selama periode Agustus 2016- Juli 2018. Hasil penelitian ini menunjukkan bahwa terdapat 31 saham efisien dari 40 saham sektor perbankan. Saham yang efisien adalah saham-saham dengan tingkat pengembalian individu lebih besar dari tingkat pengembalian yang diharapkan. Dapat diketahui bahwa terdapat 31 saham perbankan dengan tingkat pengembalian rata-rata positif dan 9 saham perbankan dengan tingkat pengembalian rata-rata negatif.

Keywords
CAPM, Beta, Expected Return

Topic
Manajemen Keuangan

Link: https://ifory.id/abstract/9pb6QXWdcPq7

Corresponding Author
Jaya Addin Linando

Institutions
Universitas Islam Indonesia

Abstract
All businesses without any exception are subject to the environmental influences. University as a business should also be aware to the effect of environmental changes. Namely there are at least nine vital components made up the environmental factors which are: Demography; Social and Cultural; Development and Regional Economy; Monetary and Fiscal Policies; Information and Processing Technologies; Natural Environment; Industry and Sectoral Policies; Governmental; Domestic and International Political. This paper would like to specifically examine International Program Universitas Islam Indonesia (IP UII) with a hope that the discussions can result on some general knowledge for other universities as their consideration to deal with the surrounding environmental factors. The method used in this paper is exploratory with most of the data are secondary data. The business implication and recommendation are stated in the last part of this paper.

Keywords
Environmental Analysis, Education, Universities, IP UII

Topic
Manajemen Strategi

Link: https://ifory.id/abstract/YLUQ2xw9d7KG

Corresponding Author
Tri Siwi Agustina

Institutions
Faculty of Economic and Business,
Airlangga University

Abstract
The purpose of this study was to determine the effect of workload pressure and person-job fit which were felt by lecturers on creativity, moderated by innovation trust in “X” University in Surabaya-s Lecturers. The population in this study were all lecturers of “X” University in Surabaya, with a total of 90 lecturers. Considering the population was still within the scope of research, the sample collection used in this study was a census, which-s take the entire population, so that the total sample was the number of all lecturers at “X” University in Surabaya. Census techniques were chosen with consideration of a relatively small population. The analysis techniques which were used was partial testing and moderator regression test using SPSS. The results of this study indicate that workload pressure and person-job fit had a positive influence on lecturer creativity. In addition, innovation trust also has been able to moderate person-job fit of creativity in “X” University in Surabaya, and it can be interpreted that person-job fit supported by innovation trust on creativity was a moderating effect.

Keywords
Workload Pressure, Person-Job Fit, Creativity, Innovation Trust

Topic
Environmental Integrated Management and Policy Making

Link: https://ifory.id/abstract/N3tqZYvT2FfQ

Corresponding Author
Muhammad Ubaidillah Al Mustofa

Institutions
(a)Faculty of Economics and Business, Universitas Airlangga, Surabaya, Indonesia

Abstract
This paper investigates the impact of the Lapindo mudflow disaster that occurred in Porong, Sidoarjo. It also evaluated the accountability of PT Lapindo Brantas Company and the government. In Islam, wealth welfare is protected as the purpose of Sharia. Thus, any action that may contradicts with this principle is prohibited. This research focuses on the aspect of wealth welfare in the Lapindo mudflow disaster area, especially the area outside the affected map, which has gotten very little attention from the government. This research is a Qualitative research that applies case study approach using informants from the communities outside the affected map and Public Appraisal Service Office (KJJP). Findings show that these communities suffer from several problems, and their biggest problems are the decreasing value of their assets (land, buildings, etc.), lower income and economic losses. The government has only paid more attention to the area of the affected map, even though the impact is also felt by the community outside the affected map. Those communities located outside the affected area do not receive any compensation. This paper expects the regional government, to look for better solutions to tackle down the overall impact of Lapindo Mudflow.

Keywords
Maqashid Shariah, Lapindo Mudflow, Disaster Management

Topic
Environmental Impact Assessment

Link: https://ifory.id/abstract/PrCnfMFE4b9g

Corresponding Author
Radian Salman

Institutions
Faculty of Law, Universitas Airlangga

Abstract
By referring to the data of Capital Investment Coordination Board throughout the year 2018, the realization of foreign capital investment (Penanaman Modal Asing or PMA) has reached a value of 293.7 trillion rupiahs. Java Island is still categorized as one of the biggest foreign capital investment destination compared to other destinations. Meanwhile, tertiary sector (i.e., sectors of electricity, gas and water; construction; commerce and reparations; hotels and restaurants; transport, warehousing and telecommunications; housing, industrial areas and office space; and other services) are recorded much more superior than the primary and secondary sectors. However, there has been significant worries about the emerging foreign capital investment that will subsequently contribute to the downfall of the sector of micro, small and medium enterprises (Usaha Mikro Kecil dan Menengah or UMKM) in indonesia. In contrast, the change of Investment Negative List (Daftar Negatif Investasi or DNI) does not affect the development of UMKM because the rate of competitiveness between domestic and foreign investment is basically different. The efforts to balance between PMA and the development of UMKM should be based on the Principles for Responsible Investment (PRI). Some related principles, such as society, environment, and government should be a concern for the foreign investors in PMA. This article tries to analyze the regulations either in the region or national in order to make an easy climate of business (ease of doing business) and to protect UMKM by accommodating PRI in regulation formations especially for PMA. The first issue focused on the national regulation formations while the second issue stressed on the local regulation analysis, especially in Java island which has more foreign investment.

Keywords
foreign capital investment, responsible investment, government, national and local regulation

Topic
Environmental Laws and Regulations

Link: https://ifory.id/abstract/vZE6nX7Cfa8t

Corresponding Author
Raras Kirana Wandira

Institutions
Faculty of Economics and Business, Universitas Airlangga

Abstract
This study was performed to determine the influence of consumers environmental concern on negative emotions resulted after consumers bought product with excessive packaging. Survey was held among 230 Taipei residents. Data were analyzed using the partial least square technique. Analysis shows that environmental concern influences negative emotions namely guilt, regret, and shame in the context of purchasing product with excessive packaging. This study contributes by giving more understanding about what make consumers feel negative emotion after purchase excessive product packaging products that are harmful for our environment.

Keywords
Excessive Product Packaging, Environmental Concern, Guilt, Regret, Shame

Topic
Industrial and Hazardous Waste Management

Link: https://ifory.id/abstract/YRqJmefyjrkc

Corresponding Author
Siti Nuraini

Institutions
Airlangga University

Abstract
Besides being surrounded by two volcanoes, Banyuwangi Regency also has a coastal, lowland, and highland topology. In order to minimize the number of victims in the event of a disaster, cooperation between the PHC and the community is needed, in this case the relevant parties must be empowered to become a community that cares about the environment and is responsive to disasters that may arise in its territory. This research shows that Banyuwangi Regency has four potential natural disasters, namely tsunamis, landslides, floods and volcanic eruptions. As many as 67% of PHC at the District Level in Banyuwangi Regency have the potential for flooding, 42% of PHC have potential tsunamis, 22% of PHC have potential landslides and 7% of PHC have potential for volcanic eruptions. The conclusions of this study are predictions about the potential disasters that may occur in the work area of each PHC can be used as a basis for consideration to encourage innovative programs in efforts to develop health center services that support more effective planning of regional activities and budgets. and efficient in accordance with the conditions and problems of each region.

Keywords
disaster, early warning development, public health center (PHC) services

Topic
Environmental Integrated Management and Policy Making

Link: https://ifory.id/abstract/UTNa6FjKvpYR

Corresponding Author
M Khoerul Mubin

Institutions
FAKULTAS EKONOMI DAN BISNIS UNIVERSITAS AIRLANGGA

Abstract
The 1997 East Asian Financial Crisis and the 2008 Global Financial Crisis make systemic risk one of the focuses of research that continues to grow and makes the financial sector the center of analysis. The relationship between financial institutions can cause rapid spread of liquidity, insolvency, and losses experienced by an institution due to the spillover effect. The banking crisis is one of the sources of the financial crisis. This study attempts to analyze how the influence of bank-s internal variabels and macroeconomics on systemic risk. Measurement of risk contribution uses the conditional value-at-risk (CoVaR) model of Adrian dan Brunnermeier (2016). The results of the study show that there are influences between internal banking and macroeconomic variabels on systemic risk in Indonesia. Liquidity, leverage, and ROA have an effect on and are positively related to systemic risk, but in this case the ROA variabel does not significantly influence while the deposit and size variabels significantly influence and are negatively related. The results of this study refute the doctrine of "Too Big To Fail" which has been valid. In macroeconomic variabels, namely the exchange rate and interbank money market interest rates (PUAB) have a positive relationship with the economic situation of a country that will affect the performance of the financial system in the country

Keywords
Systemic Risk; Delta-CoVaR; Banking

Topic
Modeling, Simulation and Optimization

Link: https://ifory.id/abstract/r8bkQAJYw4KU

Corresponding Author
Stefanus Muryanto

Institutions
Department of Chemical Engineering,
Universitas 17 Agustus 1945 Semarang

Abstract
Phosphorus (P) is the eleventh most abundant element on Earth and is essential for life, but its presence in surplus quantities is problematic. Excessive P is responsible for eutrophication of water bodies which causes deterioration of aquatic environments, naturally and economically. Also, excess of P instigates operational problems for industrial facilities due to scale formation and accumulation, which may considerably hamper heat and mass transfer and translates into substantial financial loss. In many cases, the major component of the scale is a phosphate mineral (MgNH4PO4.6H2O), widely known as struvite. In contrast, due to its low solubility and its P content, struvite is an excellent fertilizer. The primary source of P is the phosphate rock, a non-renewable resource, of which about 80% is used as raw material for fertilizers. In line with increasing global population, demand for fertilizers increases rapidly, resulting in the dwindling availability of P world-wide. Thus serious attention is paid for P recovery and reuse. This paper focuses on P recovery from wastewater through crystallization of struvite. Firstly, a brief description of the theory of crystallization is presented. Then, basic research on crystallization of struvite is discussed. Finally, the different processes for P recovery as struvite are described.

Keywords
crystallization, Phosphorus, struvite

Topic
Biology

Link: https://ifory.id/abstract/VDTB3Q6ZKfnc

Corresponding Author
Meilany Nonsi Tentua

Institutions
(a) Teknik Informatika, Fakultas Teknik, Universitas PGRI Yogyakarta, Indonesia
(b) Department of Computer Science and Electronics, FMIPA UGM, Yogyakarta, Indonesia

Abstract
Abstract. The number of available job portals causes abundant information. Therefore, a system of recommendations is needed by job seekers to find jobs that fit their profile. Offering job vacancies on job portals are changing every time because there are always additional job search data and job opening data. Multi-agents system is a technology that can be used to handle information changes. This article proposed a recommendation system is expected to help job seekers to get jobs in accordance with the field of science they have. The system will monitor what work is offered by online job portals. From the results of observations, the job content offered will be used as a reference so that if new content is entered, the agent will automatically provide input to the job seeker. Based on the results of the implementation of the recommendation system using a multi-agent system can provide search results that are in accordance with what is inputted by the user based on the profile they have. These search results can recommend jobs that match the job seeker profile.

Keywords
multi-agents system, recommender system

Topic
Computer Engineering

Link: https://ifory.id/abstract/nEvzfkpXKQJZ

Corresponding Author
Wahyu Adistya Rindarti

Institutions
Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia

Abstract
The operational phase of the road project is considered successful when this type of facilities can improve the communitys life. One of the criteria for the project that is said to be successful is by applying the concept of sustainable development, consisting of three aspects, namely economic, environmental, and social aspect. This paper discusses social aspects regarding the role of the community participation in road construction projects. In the existing practice, community participation was applied at the environmental impact assessment, considered as a form of formality to get building permits. Previous researches on community participation have been carried out in several areas such as public buildings and urban planning. However, still limited research has been conducted in the area of road construction process. This paper investigates community participation criteria using mean analysis. The first conclusions from this research, there are 20 criteria for community participation to achieve a sustainable highway project in Surabaya.

Keywords
road, community participation, sustainable development

Topic
International Symposium of Civil, Environmental, and Infrastructure Engineering

Link: https://ifory.id/abstract/ZDrny4UdYAK7

Corresponding Author
Mira Anjar Gita

Institutions
Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia

Abstract
As the second largest city in Indonesia, Surabaya has quite big number of apartment building which is increasing from year to year. As the other construction project, apartment project can be considered as successful if is completed on time according to the time, cost and quality. However, it is not sufficient for the property developer only think a success from a short term, but also in the long-term that is related to product and market success. With regard to that, a green design potentially affects the success of the project in the long-term. This paper is an initial step of the research to develop a conceptual framework to investigate relationship between green design and the success components design from the developers- perspective in Surabaya. This research can help stakeholders understand whether a green design positively affects the success of the apartment projects in the long-term

Keywords
developer, green design, market success, product success

Topic
International Symposium of Civil, Environmental, and Infrastructure Engineering

Link: https://ifory.id/abstract/Lrme8jhqnRFy