Indonesia Conference Directory

Corresponding Author
Ahmad Sohib

Institutions
Research Centre for Physics, Indonesian Institute of Sciences
Kawasan Puspiptek Serpong Gd. 442 Tangerang Selatan,
Banten 15314, Indonesia
*) asohib[at]outlook.com

Abstract
Lithium titanate is one of potential materials applied as anode material for energy storage device. The material however has poor electrical conductivity and inferior diffusion property. This study is aimed to synthesize LTO doped zirconium at titanium site to its properties and performance. In this work, a facile solid state reaction is employed to prepare Li4Ti5-xO12Zrx (x=0, 0.025, 0.05, and 0.075). Starting materials were stoichiometrically calculated and mixed by utilizing mortar for an hour than followed by calcination at 800oC for three hours. The XRD pattern reveals that lithium titanate was observed while some impurities such as rutile-TiO2 and zircon silicate still appear in all samples. The cell with LTOZr 0.05 provides the highest conductivity value of the assembled cells, 0.15 mS/cm. The CD test confirm that the highest capacity of the cells, 135.0 mAh/g, is achieved by the cell based LTOZr 0.05. In addition, CV measurement also exhibits that the current peak of the cells become sharper and the polarization degree become shorter as increasing amount of zirconium.

Keywords
lithium titanate; zirconium; Lithium ion battery

Topic
Material Science

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

Corresponding Author
Luh Suriati

Institutions
Warmadewa University

Abstract
Abstract: Edible coating is biodegradable and eco-friendly packaging that current developments. Constituent components of edible coatings in the form of hydrocolloid (polysaccharides, proteins), lipids and composite. The edible coating serves as a protective material which is packed from outside influences also functions as a matrix of antimicrobial agents. Synthetic preservatives that many outstanding raises concerns of the community to use it, because of the high risk on health. One of the potential natural ingredients as an edible coating and also as a natural preservative is Aloe Vera gel. Aloe Vera is a polysaccharide that contains many components of bioactive, but the disadvantage easily becomes diluted. Aloe Vera gel should be kept on the proper environmental conditions. This research aims to know the influence of storage temperatures against characteristics of fillet Aloe Vera that potential as an edible coating. This study used a randomized complete design. Color fillet Aloe Vera clear white initially when stored at room temperature turns pink on day 2. While stored at cold temperatures the color change on day 4. The gel is stored at cool temperatures have pH and moisture content are relatively stable, decreased severity is also lower compared to store at room temperature

Keywords
Keywords: keyword 1; Edible coating 2; gel 3; Aloe vera 4; fillet 5; biodegradeable

Topic
Material Science

Link: https://ifory.id/abstract/Yh2TtnNzKZpM

Corresponding Author
RINI SETIATI

Institutions
3Geological Engineering Department, Faculty of Earth Science and Technology, Trisakti University, Jakarta

Abstract
Salawati Basin has 0.5 BBO and 0.1 TCFG oil and gas resources respectively. Hydrocarbon is generated from Tertiary and Pre-Tertiary source rock. Several source rock studies have been conducted, such as in Sirga Formation (Late Oligocene), Kais Formation (Middle Miocene), and Klasafet Formation (Late Miocene). Lack of knowledge in characteristics and thermal modelling study or source rock in Sirga Formation and Pre-Faumai, also curiosity to observe basin reverse polarity occurence is intriguing to be researched further. The purposes of this research are to know: a.) Sirga Formation and Pre-Faumai Formation source rock characteristics to generate hydrocarbon in Salawati Basin; b.) Maturity values based on %Ro, Tmax and 1D basin modelling. Research methodology was carried out using petroleum geochmistry analysis, including: TOC, Rock Eval Pyrolisis, kerogen typing, vitrinite reflectance (%Ro) from 9 cutting samples. Based on TOC parameter, organic-rich materials in both formations show good to very good quantity. On the other hand, PY parameter shows fair to good potency quality as source rock to generate hydrocarbon. Kerogen type composition dominated NFA which indicates oxidizing marine or lacustrine depositional environment. Crossplots between HI and Tmax shows kerogen mixture type II/III which indicates transition environment (fluvio-deltaic) depositional environment. Sirga Formation and Pre-Faumai (Oligocene) show low level maturity based on %Ro and Tmax. On the contrary, based on 1D basin modelling maturity of the source rock on Warir-1X well and WIR-1A (outside research area) show higher level maturity (early to mid-mature) since Middle Pliocene and progressed into late maturity stage on oil generation since Early Pleistocene. Depocenter, generally act as mature kitchen where hydrocarbon generated. Basin polarity reversal occurred since Pliocene and changed basin configuration i.e depocenter from on southern area becoming on northern area

Keywords
Salawati Basin, characteristics, maturity, 1D basin modelling, basin polarity reversal

Topic
Material Science

Link: https://ifory.id/abstract/u2cvGpgdKPMY

Corresponding Author
FITRI NURZAKIAH FUADI

Institutions
Pendidikan Dasar Pascasarjana, Universitas Pendidikan Indonesia
Pendidikan Dasar Pascasarjana, Universitas Pendidikan Indonesia
Pendidikan Guru Sekolah Dasar, Universitas Pendidikan Indonesia

Abstract
This study aims to get an overview of students conceptual changes about water properties. The study samples were fifth grade elementary school students who had obtained water properties in their schools. The quasi-experimental method was used to obtain the data. This design consisted of two groups namely the experimental group and the control group. The instrument used was a written test with the five-tier test method. KIT IPA was used as a learning media. The experimental class was given a learning treatment with a practicum-based Predict-Observe-Explain (POE) model and the control class did not learn through practicum-based Predict-Observe-Explain (POE) model. The results showed that there were generally significant differences in conceptual changes between the experimental class and the control class. Practical activities using the Predict-Observe-Explain (POE) model were one way to convey the correct concept of the concept of water properties. In the process of mastering the concept, students went through the stages of thinking starting from the stages of predicting, observing and giving an explanation of a phenomenon. This shows that practical activities with the use of the Predict-Observe-Explain (POE) model provided better conditions to provide students with a correct understanding of the concept.

Keywords
Conceptual Changes, The Properties of Water, Predict-Observe-Explain Model

Topic
Material Science

Link: https://ifory.id/abstract/xdQEwC6Kmt3P

Corresponding Author
Zulkarnain Jalil

Institutions

1Department of Physics, Syiah Kuala University, Banda Aceh 23111, Indonesia
2Department of Mechanical Engineering, Syiah Kuala University, Banda Aceh 23111, Indonesia
3Department of Physics, Jakarta State University, Jakarta, Indonesia

Abstract
The objective of this study is to improve the hydrogen desorption temperature and the hydrogen desorption capacity. The material preparation was done through mechanical alloying technique. In this method, the milling of the material was carried out within 5 hours, 10 hours and 15 hours, ball to powder ratio was 10:1. The catalyst was inserted by 10 wt%SiC. From XRD measurements revealed that the sample was successfully reduced to a nanocrystalline scale. The phase MgH2 as the main phase, and followed by Ni and SiC phase as the minor phase. The microscopy observation with SEM showed the irregular particle shape, the particle size in the sample is not homogeneous because of the agglomeration effect during milling. The hydrogen release capacity was obtained in the samples which were milled for 10 hours at the weight of 5 wt% Ni-SiC catalyst with release of 2.6 wt% within 16 minutes.

Keywords
Magnesium, hydrogen storage, mechanical alloying, catalyst, desorption

Topic
Material Science

Link: https://ifory.id/abstract/hfKQARG4Ee3w

Corresponding Author
Arif Rahman

Institutions
Universitas Negeri Jakarta

Abstract
The synthesis of a composite series of Kaolin / Zeolite LTA were synthesized out through crystalline phase mixing and heating process at various temperatures. The composite syntesized were characterized by using SEM, XRD and FTIR, TGA and surface area analyzer. XRD analysis showed that crystal structure and amorphous phaseformed due to heating. The increasing of calcination temperature decreases LTA crystallinity significantly in line with increasing of temperature. Meanwhile FTIR spectroscopy provides information on changes in functional groups due to heating. TGA provides information on the amount of mass lost during heating due to the release of functional groups on LTA zeolite. Meanwhile N2 physisorption showed information on decreasing surface area due to increased temperature as a result of decreasing of pore volume due to heating. The calcination temperature of composites changes the composite pore structure

Keywords
composite, Kaolin/Zeolite LTA

Topic
Material Science

Link: https://ifory.id/abstract/yNtuF7h9LM6P

Corresponding Author
Dicky Rezky Munazat

Institutions
(a)Department of Physics, Universitas Indonesia, Depok 16424, Indonesia
*budhy.kurniawan[at]sci.ui.ac.id
(b)Research Center for Metallurgy and Materials, Indonesian Institute of Sciences (LIPI), Gedung 470, Puspiptek, South Tangerang 15314, Banten, Indonesia

Abstract
Polycrystalline La0.7Sr0.2Ba0.1Mn1-xNixO3 (x = 0.02 and 0.05) has been successfully synthesized by sol-gel method. This research aims to investigate the effects of low nickel substitution on the correlation between structure, microstructure, and electrical transport behavior. From Rietveld refinement result, crystal structure both samples were found to be Rhombohedral with R-3c (167) space group. Low nickel substitution at Mn-site shows that the Mn-O-Mn bond angle decreases and the Mn-O bond length increase which linked Jahn-Teller distortion, double exchange, core-shell model, and percolation model. Scanning electron microscope (SEM) result reveals that nickel substitution leads to smaller grain size. Temperature-dependent resistivity ρ(T) has been measured at 15-285 K with zero field cooling. The ρ(T) increases with decreasing grain size because of the enhancement of the grain boundary effect with the increase in the nickel content. The Curie temperature (TCMod) and the temperature of the metal-insulator transition (TM-I) moves to lower temperatures with increasing nickel substitution content. Percolation model can describe the electrical behavior of both samples based on electron-electron, electron-magnon, and electron-phonon scattering, and Kondo-like spin dependent scattering at low temperature and adiabatic small polaron hopping at high temperature.

Keywords
Nickel Substitution, Mix Valance Manganite, Percolation Model, Resistivity

Topic
Material Science

Link: https://ifory.id/abstract/xvdDfk8tEgPL

Corresponding Author
Muhamad Saepudin Wahab

Institutions
Metallurgy and Material, Indonesia University

Abstract
Dye plays a very important role in the Dye Sensitized Solar Cell (DSSC) application because the sunlight that comes in is captured and absorbed by dye. More light absorbed, the higher value of efficiency obtained. Therefore, dye plays a very vital role to increasing this efficiency value. For increasing the absorption of dye, this topic studied about effect of reduced graphene oxide (rGO) to DSSC Performance. its obtained through the hummers modified method which will be combined with dye in the ratio of wt% rGO-dye 0,1: 1; 0,3: 1; and 0,5: 1 respectively. Thickness Variation of rGO on the ITO transparent glass to enhance efficiency of DSSC also studied. The result show power conversion efficiency of the DSSC with the rGO-dye 0,1:1 (0,008%), rGO-dye 0,3:1 (0,019%), and rGO-dye 0,5:1 (0,0073%), which was higher than that of the DSSC without the rGO (0,0046%). ZnO nanorod as photoanode obtained by chemical bath deposition which is growth in temperatur 0 degree Celcius and Platina (Pt) as the counter electrode. SEM, UV-Vis and XRD were used to characterization of rGO and ZnO.

Keywords
DSSC,reduced graphene oxide, ZnO

Topic
Material Science

Link: https://ifory.id/abstract/NrLBXmynM2CD

Corresponding Author
Umar Faruq

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia
*budhy.kurniawan[at]sci.ui.ac.id

Abstract
The effect of sintering temperature on the structure and morphology of Ca0.95La0.02Bi0.03MnO3 was investigated by X-ray diffraction and Scanning Electron Microscopy. The sample was prepared by sol-gel method. Their homogeneity was confirmed using X-ray diffraction. Rietveld refinement of X-Ray diffraction results showed that the sample sintered at 1100 C for 12 h are single phase and have an orthorhombic structure with Pnma space group. While the samples were sintered at 900 C and 1000 C did not show a single phase due to another peak is found. For the lattice parameter, crystal volume increases with increasing sintering temperature. The largest crystal volume was reached at sintering temperature 1100 C which is equal to 208.535 Å. For the angle of the Mn-O-Mn bond, the sample was sintered at 1000 C has the largest value obtained 152.778 (deg) while at 1100 C is 152.702 (deg) and 900 C is 151.652 (deg). For the average Mn-O bond length shows relatively the same value for all sintering temperature. Scanning Electron Microscopy was used to study the morphology of the materials, grain size increases with increasing sintering temperature.

Keywords
CaMnO3, Sintering temperature, Sol-gel method, Lattice parameter

Topic
Material Science

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

Corresponding Author
Mega Novita

Institutions
a) Faculty of Engineering and Informatics, Universitas PGRI Semarang, Jl. Sidodadi-Timur No.24 Semarang, Central Java 50232, Indonesia
*novita[at]upgris.ac.id
b) Faculty of Mathematics, Natural Science and Information Technology Eduation, Universitas PGRI Semarang, Jl. Sidodadi-Timur No.24 Semarang, Central Java 50232, Indonesia
c) Lembaga Penelitian dan Pengabdian Kepada Masyarakat, Universitas PGRI Semarang, Jl. Lontar No.1 Semarang, Central Java 50232, Indonesia
d) School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen Sanda, Hyogo 669-1337 Japan

Abstract
We performed an investigation on (alpha)-Al(_{2})O(_{3}): Mn(^{3+}) material based on first-principles calculations without referring to any experimental parameter for the first time. In order to estimate the lattice relaxation effect due to Mn(^{3+}) substitution, we carried out a geometry optimization using Cambridge Serial Total Energy Package (CASTEP) code. Next, the molecular orbitals (MO) were calculated using the discrete variational-X(alpha) (DV-X(alpha)) method while the multiplet energies were calculated discrete variational multi-electron (DVME) method. Since, the multiplet energies are generally overestimated, here we also used the energy corrections to improve the accuracy. We thus compared our calculated results with the observed data reported by McClure et. al., (1962). The results shows that by considering both of the lattice relaxation effect and the energy corrections, the agreement between our calculated results and the observed data is improved.

Keywords
Mn3+, a-Al2O3, first-principles, DV-Xa, DVME

Topic
Material Science

Link: https://ifory.id/abstract/WXfJLqx83BA7

Corresponding Author
Afrizal Afrizal

Institutions
Departmen Chemistry of Universitas Negeri Jakarta

Abstract
Research and development of liquid crystal of cholesteryl acrylate growing up now. The aim of this research is to synthesis composites and polymerizations of cholesteryl acrylate with dopan of indium tin oxide (ITO). The blending process of cholesterol acrylate and ITO was performed using casting solution technique at 75&

Keywords
Cholesteryl acrylate, composite, photopolymerization, UV curing, characteristic and conductivity

Topic
Material Science

Link: https://ifory.id/abstract/Cbet8vBuKngP

Corresponding Author
Susilawati -

Institutions
Universitas Wijaya Kusuma Surabaya

Abstract
Rhizosphere microorganisms such as phosphate solubilizing bacteria have been widely reported as bacteria that have the ability as phosphate solvents and promote growth. The purpose of this research was to isolate the indigenous bacteria from waste Maja fruit and evaluate whether these could enhance the viability of deteriorating rice seeds. The method used in the first stage of isolation, and evaluation of germination of rice seeds using a completely randomized design. It was revealed that three isolates are isolate 1-1, isolat1-2, and isolate 1-4 were able to solubilise phosphate and produce indole. The Result showed that the three isolates were able to increase the persentage of germination by up to 39,33%, the uniformity of germination by up to 40,76% and germination rate by up 10,46%/d.

Keywords
Phosphate solubilizng bacteria; Waste maja fruit; Viability; Rice seeds

Topic
Material Science

Link: https://ifory.id/abstract/fYE3n8pZwRTX

Corresponding Author
Siska Titik Dwiyati

Institutions
Pendidikan Teknik Mesin, Universitas Negeri Jakarta

Abstract
The purpose of this research was to study tensile properties of 3D printing ABS material with axial and lateral direction. The specimen was printed according to ASTM D 632-02 by layer thickess variations around 0.1 mm, 0.2 mm and 0.3 mm. Moreover, three specimens was made for each printing direction. Tensile test was performed using Zwick Roell Series Z 021 machine. Then, the fracture surface was studied with scanning electron microscope (SEM). Based on the research from 6 variations layer of 3D printing, the optimal result was found on the axial direction of 0,3 mm thickness layer with tensile strength 30,6 MPa and ultimate tensile strength 550,81 N. The voids were seen at the fracture surface.

Keywords
3D printing, tensile properties

Topic
Material Science

Link: https://ifory.id/abstract/9V7Xjr3wJKbz

Corresponding Author
dhawud sabilur razaq

Institutions
(a) Department of Physics, Universitas Indonesia, Depok 16424, Indonesia
* budhy.kurniawan[at]sci.ui.ac.id
(b) Research Center for Metallurgy and Materials, Indonesian Institute of Sciences (LIPI), Gedung 470, Puspiptek, South Tangerang 15314, Banten, Indonesia

Abstract
A systematic study of the La0.7Ba0.1Sr0.2Mn0.85Cu0.15O3 manganites have been conducted, mainly to understand the influence of sintering temperature on structure, microstructure, and electrical transport properties in the materials. Polycrystalline sample of La0.7Ba0.1Sr0.2Mn0.85Cu0.15O3 were prepared using sol-gel method and sintered at 1100 °C and 1200 °C. X-ray diffraction result shows that sintering temperature does not affect the crystal structure of the materials which remain rhombohedral with R-3c space group. a more detailed examination shows that sintering temperature change the unit cell volume, bond length, and bond angle of the samples. The electrical resistivity decreases followed by the decrease in the grain size with the increase in sintering temperature. Analysis using theoretical model shows that both samples can be well explained using percolation model. Fitting result suggests that the transport properties of the materials at low temperature were governed by the scattering and interaction between electron, phonon, and magnon. At high temperature, the electrical transport of the samples were governed by the hopping of polarons.

Keywords
Structure; Electrical Transport; Sintering; Percolation Model; Manganites

Topic
Material Science

Link: https://ifory.id/abstract/QhkW6jvTfrCw

Corresponding Author
Zulkarnain Jalil

Institutions

1Department of Physics, Syiah Kuala University, Banda Aceh 23111, Indonesia
2Department of Mechanical Engineering, Syiah Kuala University, Banda Aceh 23111, Indonesia
3Department of Physics, Jakarta State University, Jakarta, Indonesia

Abstract
MgH2 is one of the most promising material for hydrogen storage application, since its reversible and able to store hydrogen in large amounts of 7.6wt%. In this study, nickel and silicon oxide catalysts were used to reduce the operational temperature of MgH2. The silicon oxide used in this study was extracted from rice husks ash. The composition of MgH2 + 10wt% SiO2 + 5wt% Ni was prepared by mechanical alloying technique, by varying milling time 1, 5, 10 and 15 hours. XRD results indicate a decrease in particle size with longer milling time. MgH2 was obtained as the main phase followed by Ni and SiO2. SEM results showed that the longer milling time, the more particle size is homogeneous. Furthermore, thermal investigation using DSC showed that the desorption temperature obtained was in the range of values of 331,8 0C to 342,3 0C. The addition of 10wt% SiO2 and 5wt% Ni have improved sorption temperature and kinetic of MgH2.

Keywords
Magnesium, hydrogen storage, mechanical alloying, catalyst, desorption

Topic
Material Science

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

Corresponding Author
Muhammad Arsyad

Institutions
a) Mechanical Engineering Department, Politeknik Negeri Ujung Pandang, Jalan Perintis Kemerdekaan KM.10 Tamalanrea, Makassar 90245, Indonesia
b) Mechanical Engineering Department, Univeristas Brawijaya, Jalan M.T. Haryono No.167 Malang 65145, Indonesia
* arsyadhabe[at]poliupg.ac.id

Abstract
The objectives of research is to determine the effect of long soaking of coconut fiber in alkaline solution to the tensile strength of coconut fiber. The testing stages include preparation, soaking, drying, testing, and analysis. The materials used consist of coconut fiber, alkali solution, aquades, tensile test equipment, and furnace. Coconut fiber is soaked in an alkali solution with a concentration of 20% for 1, 5, 7, 9, and 11 hours. Then, the coconut fiber was rinsed with aquades before being dried in a furnace at 90oC for 5 hours. Furthermore, tests of mechanical properties include a single fiber tensile of coconut fiber with ASTM. Based on the results and discussion, it can be concluded that (a) the alkali treatment decreases the amount of hemicellulose and cellulose in coconut fiber, (b) the maximum tensile strength obtained at 7 hour treatment is 223.907 N/mm2.

Keywords
soaking; alkali; tensile; coir

Topic
Material Science

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

Corresponding Author
RINI SETIATI

Institutions
Petroleum Engineering Departement , FTKE, Universitas Trisakti , Jakarta

Abstract
Pore volume of foam cement is a main factor affected compressive strength in the addition axial load design. Foam agent material used in this research is Sika-aer as a replace the nitrogen gasses. This research study used mix composition cement 1 : silica sand 0.25 : water 0.5and foam agent 0.03% - 0.15% BWOC. The purpose of this study is provide alternative cementing product beside lightweight cement in oil and gas industry with foam cement to mitigate loss circulations. Compressive strength testing was carried out with different time periods and pore volume testing were carried out on each addition/change in foam agent concentrations every cement slurry mixture. Characteristics of bubbles on cement slurry is one of many factors that influences compressive strength parameters. Compressive strength foam cement depends on size, diameters and relationship between bubbles on the cement slurry. This laboratory study produced compressive strength values between 1078 psia – 3745 psia and pore volume values between 15 cc – 17 cc in 5 samples core foam cement with different foam agent concentrations Sika-aer.

Keywords
foam cement, pore volume, compressive strength, bubbles, Sika-aer

Topic
Material Science

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

Corresponding Author
Riser Fahdiran

Institutions
Department of Physics, State University of Jakarta

Abstract
We employed molecular dynamics simulation to explore the melting dynamics of Gold thin film due to ultrashort high-intensities laser irradiation. The film has dimension of 10 nm x 10 nm in lateral periodic condition and thickness 10 nm with free condition. The system is suppressed by the laser energy slightly above melting threshold and simulated under homogeneous and instantaneous energization. Within several ps the system already melt and the evolution are followed based on trajectory of each atom dynamics. During the expansion of the film, we also performed the local structure change based on Common Neighbor Analysis (CNA) method. Structure factor analysis indicated that the film is melted completely at the end of simulation, t = 20 ps.

Keywords
Melting; Thin Film; Gold; Molecular Dynamics

Topic
Material Science

Link: https://ifory.id/abstract/YAXrh2bxwgf8

Corresponding Author
LISA SAMURA

Institutions
a) Petroleum Engineering Department, Trisakti University,
Jalan Kyai Tapa no 1, Jakarta 11440, Indonesia
*cahayarosyidan[at]trisakti.ac.id
b) Sekolah Tinggi Teknologi Tekstil Bandung, Jalan Jakarta
no.31, Bandung , 40272, Indonesia

Abstract
Textile materials, especially yarns formed from polymers such as polyester during deformation, have viscoelastic properties, namely a combination of elastic and viscous properties. Several studies have been conducted to model viscoelastic on textile materials, especially yarns. In this study, modeling is done by fitting data through experiments which are then modeled with a theory of the modification of the Maxwell model as a reference in making predictions through the data fitting method. The results of the data fitting prediction in the form of exponential curves have a regression value that approaches the experimental curve (R^2 = 0.999 and 0.999).

Keywords
Viscoelastic ; data fitting ; Maxwell Model

Topic
Material Science

Link: https://ifory.id/abstract/42RwTzBygdvj

Corresponding Author
Setia Budi

Institutions
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Jakarta Timur 13220, Indonesia

Abstract
Nanostructured films of polyaniline were successfully synthesised using electrodeposition technique on stainless substrates. Fourier transform infrared spectroscopy, and X-ray diffraction investigation indicated that the electrodeposited polyaniline was an emeraldine phase. The influence of electrodeposition potentials on morphology, Brumauer-Emmet-Teller surface area and impedance values of the films were determined based on a scanning electron microscope, surface area analyser, and electrochemical impedance spectroscopy measurements, respectively. The films were composed by nanofiber polyaniline with diameter range from 10 to 60 nm. An increase of electrodeposition potential reduced the polyaniline diameter that produced high surface area films which resulted in high specific capacitance and low impedance values. This work shows the role of electropolymerization potential in controlling the necessary properties of the electrodeposited polyaniline films.

Keywords
nanostrcutured film, polyanilin, electrodeposition potential, BET surface area, impedance

Topic
Material Science

Link: https://ifory.id/abstract/C4GXKTZrjb9z

Corresponding Author
RINI SETIATI

Institutions
Geology Department, FTKE, Universitas Trisakti

Abstract
A new thinking of gas play in Tawun formation East Java Basin is a result of an integrated research of mud volcano from surface to subsurface data, overpresured and Hele-Shaw analog modeling. The presence of methane gas seepage in the mud volcano proves the existence gas associated with mud and overpressured zones. Analysis of C isotope of samples of gas seepage of mud-volcano indicate thermogenic methane gas at the level of thermal maturity equivalent to the peak of petroleum formation. The overpressured mud zone has a potential to be an unconventional gas reservoir with high gas storage capacity. Mud-gas-play is defined as the accumulated gas which is trapped in the overpressured zone. Gas accumulations have a tendency to be concentrated upper part of overpressure zone. Type of the reservoir and how the gas storage are the differences from the conventional of gas play concept. Reservoir geometry of mud-gas-play is a chamber shaped which cross sediment layer. Gas is trapped in rocks with very low bearing capacity which have high pressure. Two mechanisms of gas trapped in overpressured shale are dissolved and adsorbed. The gas storage capacity of the mud based on adsorption analysis at temperature 65 degree celcius ranges from 812 scf/ton up to 3,217 scf/ton. The unconventional gas reservoirs of overpressured mud zone is proposed as a new hydrocarbon play: mud-gas-play (MGP).

Keywords
mud volcano, overpressured, adsorption, mud gas play

Topic
Material Science

Link: https://ifory.id/abstract/K8Xqg3QPmzb6

Corresponding Author
Mega Novita

Institutions
a) Faculty of Engineering and Informatics, Universitas PGRI Semarang, Jl. Sidodadi-Timur No.24 Semarang, Central Java 50232, Indonesia
*novita[at]upgris.ac.id
b) Lembaga Penelitian dan Pengabdian Kepada Masyarakat, Universitas PGRI Semarang, Jl. Lontar No.1 Semarang, Central Java 50232, Indonesia
c) School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen Sanda, Hyogo 669-1337 Japan

Abstract
Ruby, or the trivalent chromium ion activated in alumina crystal ((alpha)-Al(_{2})O(_{3}): Cr(^{3+})), needless to say, is a beautiful gemstone and known as the first solid-state laser in history. The so-called "ruby pressure scale" using its fluorescence lines is particularly popular in high-pressure science because of the simplicity and the accuracy of optical measurements in the diamond-anvil cell (DAC) experiments. Therefore, here performed first-principles band-structure calculations on the effect of external pressure on ruby bond length without referring to any experimental parameter. Cambridge Serial Total Energy Package (CASTEP) code was utilized to estimate the lattice relaxation effect as the external pressure applied which results in the ruby bond length. Firstly, we carried out the structural optimization of the pure (alpha)-Al(_{2})O(_{3}) crystal and then followed by the geometry optimization of (alpha)-Al(_{2})O(_{3}): Cr(^{3+}). The results show that Al-O bond lengths of the pure (alpha)-Al(_{2})O(_{3}) crystal and Cr-O bond lengths of (alpha)-Al(_{2})O(_{3}): Cr(^{3+}) decreased as the applied pressure increased.

Keywords
pressure, first-principles, CASTEP, a-Al2O3

Topic
Material Science

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

Corresponding Author
Syamsul Hakim

Institutions
Magister Pendidikan IPA Universitas Mataram

Abstract
The study of semiconductor material is a basic experiment. This study aims to identify the effect of SnO2 doped Indium sol-gel color and the effect of the number of slicks on the thin film spread evenly on the glass transparent. The variation of SnO2 doping Indium is 0, 5, 10, 15, 20, and 25%. The technique used in making thin films uses the sol-gel spin coating technique. Spin coating is a technique that is simple, economical, and produces a fairly good thin film. The manufacturing process kind of three stages namely substrate washing, sol-gel making, and thin film growth done respectively. The results showed that sol gel with doping variations had different colors, the higher doping percentage, the clearer sol-gel solution was. The coating results of the thin films have increased, the more coated the surface of the layer looks more evenly with the number of 1, 2, 3, and 4 slicks respectively. The increase doping variations influence to the transparent color of sol-gel be increased. The increase number of slick effect to the thin films more thickness and smooth.

Keywords
Sol-gel, Spin Coating, thin Films, SnO2, Indium

Topic
Material Science

Link: https://ifory.id/abstract/KDZ2rGedQAPn

Corresponding Author
Ikhwan Nur Rahman

Institutions
a) Departement of Physics, Faculty of Mathematics and natural Sciences, Universitas Indonesia, Depok 16424, Indonesia
*budhy.kurniawan[at]sci.ui.ac.id
b) Research center for Metallurgy and Materials, Indonesian Institute of Science (LIPI), Gedung 470, Puspitek, South Tangerang 15314, Banten, Indonesia

Abstract
Bulk polycrystalline sample of La0.8Ag0.2MnO3 has been successfully synthesized by the sol gel method. Structural, morphology, electrical properties and magnetoresistance has been investigated. Refinement results from XRD at room temperature showed a single phase material with a rhombohedral crystal structure and R-3c space group. Electrical transport showed by comparison of experimental data with theoretical model, the sample undergo a metal-insulator transition at TM-I accompanying the ferromagnetic-paramagnetic transition. Data for temperature dependence of resistivity has been fitted using the formula ρ(T)= ρ_FM f+ 〖(1-f)ρ〗_PM, ρFM is resistivity of the ferromagnetic region, ρPM is resistivity of the paramagnetic region and f is the volume fraction of ferromagnetic phase. Result of fitted data is in good agreement with experimental data. MR measurements in the range of magnetic field 0-1 T, measurements were carried out at temperatures of 15 K, 100 K, 200 K and 285 K, the results showed a decrease in resistivity.

Keywords
electrical transport; magnetoresistance; percolation model

Topic
Material Science

Link: https://ifory.id/abstract/c8JkTUnaBRjE

Corresponding Author
Soni Setiadji

Institutions
[1]Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung, Jl. A.H. Nasution No.105 Bandung, West Java, 40614, Indonesia.
[2]Department of Chemistry Education, UIN Sunan Gunung Djati Bandung, Jl. Cimincrang, Cimenerang, Panyileukan, Bandung, West Java, 40292, Indonesia.
[3]Master Program in Computational Science, Faculty of Mathematic and Natural Science, Institut Teknologi Bandung, Jl.Ganesha No. 10, Bandung, West Java, 40132, Indonesia

Abstract
NaX zeolite is a synthetic zeolites with faujasite framework that has large pores, which it is largely used as adsorbents. NaX zeolite was synthesized using silica which was extracted from elephant grass. The silica was isolated from elephant grass using its ash with conventional ignition method, with NaOH as solvent. The extracted silica purity is 86,33%. NaX zeolite was synthesized with 3.5 Na2O : Al2O3 : 2.9 SiO2 : 150 H2O as molar ratio in hydrothermal condition at 90 °C for 15 hours. Synthesized zeolite were then characterized using FT-IR to confirm the formation of zeolite based on chemical bonding that appears on the spectrum, XRD to confirm the framework structure of the formed zeolite, and SEM to obtain its morphology. Based on those analysis, it is known that the result of synthesis process is zeolite with NaX crystal structure and octahedral morphology with crystal sizes range 1-5 µm.

Keywords
silica extraction, elephant grass, zeolite synthesis, NaX zeolite, hydrothermal method

Topic
Material Science

Link: https://ifory.id/abstract/eNPYKBDtxX3R

Corresponding Author
Agus Setyo Budi

Institutions
aDepartment of Physics, Universitas Negeri Jakarta
Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia
bDepartment of Physics Education, Universitas Negeri Jakarta
Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia

Abstract
The aim of this research to investigate the influence of temperature and additive effect of coconut shell charcoal on the density and porosity of ceramic membranes based on zeolite and soil. With the addition of additives in the form of charcoal can reduce the density of ceramic membranes. It can also increase porosity of ceramics and clay based zeolite membranes. The results of the study show that based on the results of the Scanning Electron Microscopy (SEM), it can be seen that the largest pore size is owned by samples containing 80% zeolite and 10% additional. The number of pores produced depends on how much additive content is contained in the sample. The conclusion is that there is a tendency for the temperature to rise and the more additives contained in the sample, the more pores produced.

Keywords
Temperature; additive coconut shell charcoal; density; porosity.

Topic
Material Science

Link: https://ifory.id/abstract/GmABPfLEYy6R

Corresponding Author
Agus Setyo Budi

Institutions
aDepartment of Physics, Universitas Negeri Jakarta
Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia
bDepartment of Physics Education, Universitas Negeri Jakarta
Jl. Pemuda 10, Rawamangaun, Jakarta 13220, Indonesia

Abstract
In this research, we investigate the mechanical behaviour of zinc sodium phosphate glass system with the various concentration of chromium oxide doped. The glass system was synthesized using the melt quenching technique. The concentration of chromium oxide varying from 0.5% to 2.5%. Longitudinal and shear ultrasonic velocities were measured in different compositions of the glass system at temperature range between 270 K and 323 K. From the transit time data and density, we found that all the mechanical behaviour for these glasses decrease as the Cr2O3 content increase, which indicates a weakening of the binding energy in the network.

Keywords
Chromium oxide, Ultrasonic velocities, zinc sodium phosphate glass

Topic
Material Science

Link: https://ifory.id/abstract/M9zRQV2wd4XT

Corresponding Author
Anita Eka Putri

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia
*vivi[at]sci.ui.ac.id
b) Departement ofPhysicsEducation, Universitas Muhammadiyah Prof. Dr. Hamka, Jakarta Timur 12130, Indonesia

Abstract
The photocatalytic performance of Zinc oxide nanorods (ZnO NRs) still needs to be improved. One method that could be used to enhance the photocatalytic activity of ZnO NRs is by adding the noble metals nanoparticles and transition metals dopings. In this work,we synthesized nanocomposites of ZnO NRs/Au and Co-doped ZnO NRs/Au nanoparticles (NPs) by using ultrasonic spray pyrolysis and hydrothermal methods on the glass substrate. The microstructural, morphological, and optical properties of both nanocomposites were characterized by using XRD, FESEM and UV-Vis and PL spectroscopy. The photocatalytic performance was evaluated through the degradation of methylene blue (MB) under UV radiation. The results show that the pure ZnO NRs only degrades 28.8%, while the ZnO NRs/Au NPs could degrades 37.3%. Furthermore, the Co doped ZnO NRs/Au NPs also increases the degradation rate up to 46.5%. Based on these results, we conclude that the presence of Au on ZnO NR-s surface could enhance the photocatalytic activity due to its role as an electron sink that reduces the recombination rate of electrons and holes while the incorporation of Co in ZnO NRs could also enhance the number of crystal defects that beneficial for enhancing the photocatalytic activity of ZnO NRs.

Keywords
ZnO NRs/AuNPs nanocomposite; Co-doped; electron sink; photocatalytic activity; recombination

Topic
Material Science

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

Corresponding Author
Iwan Sugihartono

Institutions
(1)Program Studi Fisika, FMIPA Universitas Negeri Jakarta, Jl. Rawamangun Muka No. 01, Jakarta Timur 13220, Indonesia
(2)Research Center for Physics, Indonesian Institute of Sciences, Banten 15314, Indonesia

Abstract
We have synthesized ZnO nanorods by hydrothermal at 95 oC for two hours on different substrates ie glass, ZnO and ITO. Morphologically, the average diameter of ZnO nanorods on glass, ZnO, ITO are 117.6 um, 133 um, 98.4 um, respectively. According to international centre for diffraction data (ICDD) number 01 079 0207, the ZnO nanorods on all substrates possess a polycrystalline wurtzite structure. Optically, ZnO nanorods on a glass substrate have strongest excitonic related ultraviolet (UV) emission. Its predicted, the ZnO seed layer deposited on glass substrate has optimum crystal structure and suppress defects related visible emission.

Keywords
ZnO nanorods, different substrate, polycrystalline wurtzite, UV emission

Topic
Material Science

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

Corresponding Author
Hasniah Aliah

Institutions
a) Department of Physics, UIN Sunan Gunung Djati Bandung, Jl. A H Nasution 105, Bandung 40614, Indonesia
*hasniahaliah[at]uinsgd.ac.id
b) Center for Applied Nuclear Science and Technology, BATAN, Jl. Taman Sari 71 Bandung 40132, Indonesia
c) Department of Physics Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi 229 Bandung 40154, Indonesia
d)Center of Research, UIN Sunan Gunung Djati, Jl. A.H. Nasution 105 Bandung 40164, Indonesia
e) Department of Physics Education, UIN Sunan Gunung Djati Bandung, Jl. A.H. Nasution 105 Bandung 40164, Indonesia

Abstract
This report has been written based on research aimed to know electrical characterize, structure, and morphology of ceramic nanocomposites. Materials are used to consist of Indonesia local minerals are jarosite and manganite minerals as sources oxide iron, mangan, and oxide zinc is from commercial. The third materials were mixed by using precipitation method whereas the ceramic nanocomposite was fabricated by using a screen printing method and fired at 600 °C temperature with a furnace. Sample structure and morphology had been examined by using XRD and SEM respectively. The result of the characterization indicated that a sample was fabricated measured nanometer scale with three phases on diffraction peaks and had hexagonal-spinel structures. The sample also had high porosity. The electrical charracteristic of the sample was examined with an electrical tester had to function R-T in ambient and alcohol environments. Resistance value had been known in ambient and alcohol environments were different. The difference in resistance value indicated that a sample had a very different response in both of the environments. Nanometre size and high porosity of the sample were very supported to be processed gas adsorption. So, a sample had a high level of response. Therefore, nanocomposite ceramic had been fabricated potentially for application in the sensor field, especially as an alcohol gas sensor.

Keywords
Nanocomposite, Jarosite, Manganite, Spinel, Alcohol gas sensor

Topic
Material Science

Link: https://ifory.id/abstract/pZ7Hf2qgFdwT