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All Journal Jurnal Teori dan Aplikasi Fisika Journal of Technomaterial Physics Makara Journal of Science
Simon Sembiring
Department of Physics, University of Lampung, Jl. Prof. Soemantri Brodjonegoro No. 1 Bandar Lampung 35145
Astronomy Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Pengaruh Penambahan Alumina (Al2O3) 0, 10, dan 15 wt% terhadap Karakteristik Konduktivitas Listrik dan Mikrostruktur Cordierite (2MgO.2Al2O3.5SiO2) Berbasis Silika Sekam Padi Oktivianty, Shella Windi; Sembiring, Simon; Simanjuntak, Wasinton; Karo-Karo, Pulung
Jurnal Teori dan Aplikasi Fisika Vol 4, No 2 (2016): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v4i2.1339

Abstract

Penelitian ini dilakukan untuk mengetahui pengaruh penambahan alumina terhadap karakteristik fisis, mikrostruktur, dan konduktivitas listrik cordierite. Silika diperoleh dari sekam padi melalui metode sol-gel sedangkan alumina dan magnesium berasal dari MERCK. Cordierite disintesis melalui metode padatan dengan suhu sintering 1200oC. Hasil Pengukuran menunjukkan bahwa penambahan alumina mengurangi densitas, menambah porositas, dan menurunkan nilai konduktivitas listrik sampel. Karakterisasi dengan Scanning Electron Microscopy (SEM) menunjukkan adanya bentuk yang tidak beraturan, pori yang semakin banyak dan aglomerasi yang semakin besar pada sampel dengan penambahan alumina.
The Use of Carbon Dioxide Released from Coconut Shell Combustion to Produce Na2CO3 Simanjuntak, Wasinton; Sembiring, Simon; Zakaria, Wan Abbas; Pandiangan, Kamisah D
Makara Journal of Science Vol. 18, No. 3
Publisher : UI Scholars Hub

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Abstract

In this investigation, sodium carbonate (Na2CO3) was produced by reacting the CO2 released from coconut shell combustion with NaOH solution with molar concentrations of 6.5, 7.0, 7.5, and 8.0 M. The main purpose of the study was to assess the potential of the proposed method for mitigation of the CO2 gas released into the atmosphere by the coconut shell industry. The Na2CO3 powder produced was oven-dried at 110 oC and subsequently characterized using FTIR, XRD, and SEM/EDS techniques. Thermal analysis was also carried out using DTA/TGA to investigate the thermal mechanisms of sodium carbonate formation. The experimental results show that the concentration of NaOH influences the mass of sodium carbonate produced, with the highest mass of 190.6 g obtained using 7.0 M NaOH solution. The FTIR analyses show the existence of O-H, C-O, C=O, and CO3 -2, confirming the formation of Na2CO3. The C-S functional group was also detected most likely due to the presence of the sulfur that naturally exists in the coconut shell. The formation of Na2CO3 is also supported by the presence of C, Na, and O on the EDS results and the presence of the thermonatrite (Na2CO3.H2O) phase, as seen by the XRD. The XRD analysis of the sintered sample at 450 oC indicates the transformation of thermonatrite into sodium carbonate and sodium oxide, which is in accordance with the results of DTA/TGA analysis. Based on the results obtained, it is concluded that the proposed method can be applied to mitigation of CO2 gas released by the coconut shell industry.
X-ray Diffraction Phase Analyses of Mullite Derived from Rice Husk Silica Sembiring, Simon; Simanjuntak, Wasinton
Makara Journal of Science Vol. 16, No. 2
Publisher : UI Scholars Hub

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Abstract

X-ray Diffraction Phase Analyses of Mullite Derived from Rice Husk Silica
THE USE OF THE RIETVELD METHOD TO STUDY THE PHASE COMPOSITION OF CORDIERITE (Mg2Al4Si5O18) CERAMICS PREPARED FROM RICE HUSK SILICA Simanjuntak, Wasinton; Sembiring, Simon
Makara Journal of Science Vol. 15, No. 1
Publisher : UI Scholars Hub

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Abstract

This research presents the use of the Rietveld method to study the phase composition of cordierite (MG2AL4SI5O18) ceramics prepared from rice husk silica, after the samples were sintered at 1300, 1400 and 1500 °C. The formation of cordierite is temperature-dependent as indicated by the relative phase composition obtained from x-ray diffraction patterns for the cordierite and spinel increased markedly with increasing temperature, i.e, from 38.98 to 54.15 wt% and from 11.81 to 17.99 wt % following the increase in temperature from 1300-1500 °C, respectively. The above values were obtained with the aid of the Rietveld method, carried out until the goodness of fit values (GoF) reached below 2, which is considered a satisfactory value to reveal the real phase composition. Different plots produced by refinement using the Rietveld method also reveal a reasonable fit between the observed and the calculated plot, demonstrating the usefulness of the method for calculating the quantity of phase composition in the sintering process
Preliminary Study on Functional Groups Characteristics of Asphalt Containing Rice Husk Silica Sembiring, Simon
Journal of Technomaterial Physics Vol. 1 No. 1 (2019): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v1i1.826

Abstract

In this research, asphalt composite was produced by combining asphalt and rice husk silica. The ratio of asphalt and silica were 1:1.5; 1:1.7; and 1:1.9 respectively and calcined at temperature of 150 oC. Functional group characteristics of asphalt composites were examined by FTIR and XRD. The FTIR and XRD studies revealed that the main Functional groups are Si-O-Si, C-H, and structure amorph of silica.
Co-Authors Oktivianty, Shella Windi Pandiangan, Kamisah D Pulung Karo-Karo Wan Abbas Zakaria Wasinton Simanjuntak