Indonesia Conference Directory

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
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
Efendi Mabruri

Institutions
Research Center for Metallurgy and Materials, Indonesian Institute of Sciences

Abstract
The high alloyed austenitic stainless steels such as Fe-15Cr-25Ni type alloys are used in severe environment where a good combination of corrosion resistance and mechanical properties is required in a wide range of elevated temperatures. The high temperature stability of austenitic stainless steels correlates with microstructure of the steels consisted of (-matrix with stable second phases. The alloying elements incorporated into the alloys modify the second phase precipitation and affect the properties. Recently, it is found that the addition of W and Nb into the Fe-15Cr-25Ni steel improved the mechanical propertires and corrosion resistance of the alloys. In this work subsequence investigation has been conducted to clarify the effect of heat treatment on the pitting resistance of the developed Fe-15Cr-25Ni-2W-2Nb steel. The steels were prepared by induction melting following with hot forging and heat treatment. Both the temperature of solution treatment and of aging were varied and the cyclic polarisation were measured on each samples of difference heat treatment temperature. The observation by SEM was taken on some samples for microstructural confirmation. In general, the solution treated sampel had higher pitting potential than the aged ones. The pitting potential increased with the increasing solution treatment temperature. The SEM images showed the precipitation high Nb containing precipitates.

Keywords
pitting resistance, high alloyed austenitic stainless steel, heat treatmen, solution treatment, aging

Topic
Minerals and Complex Materials

Link: https://ifory.id/abstract/7tAHbxhrMcje

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
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
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