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All Journal TEKNIK Jurnal Teori dan Aplikasi Fisika
Roniyus Marjunus
Jurusan Fisika, Universitas Lampung
Astronomy Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Physics

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Variasi Doping Pb Terhadap Pertumbuhan Fase Superkonduktor BPSCCO-2223 Pada Kadar Ca = 2,10 mol Menggunakan Metode Pencampuran Basah Ade Setiawan; Suprihatin Suprihatin; Roniyus Marjunus
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 2 (2022): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v10i2.295

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Pengaruh Variasi Komposisi Aerogel Silika Terhadap Sifat Fisis Pada Pembuatan Biofoam Chandra Gumilang; Roniyus Marjunus; Agus Riyanto; Sutiarno
Jurnal Teori dan Aplikasi Fisika Vol. 14 No. 01 (2026): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v14i01.430

Abstract

Biofoam is a type of bioplastic that can be used as an alternative packaging product to replace styrofoam. Biofoam still has a high value of water absorption, so silica aerogel is added as a hydrophobic agent. The purpose of this study was to determine the effect of adding silica aerogel to the functional groups of biofoam, crystal structure, density and water absorption. The method used in this research is thermopressing. The thermopressing method is a method where all the ingredients, started from fiber, starch, silica aerogel and PVA, were mixed to form a dough and then pressed for 3 minutes at 150℃ using a thermopressing tool. In relation to the characteristic results obtained from the FTIR analysis, it was found the presence of silica aerogel functional groups at wave numbers 1058.60 cm-1 and 925.83 cm-1. Apart from silica, the functional groups of cellulose and starch are also found. Furthermore, the results of the crystal structure analysis found silica and cellulose phases with different phase weight percent values. Where the weight percent of the phase for silica increases and the weight percent for the cellulose phase decreases with the addition of silica composition. The results of the physical density test showed that the density value decreased with increasing silica composition. The results of the analysis of water absorption show that the value of water absorption increases with increasing silica composition, this is because silica has morphological properties in the form of an ultraporous solid material that is able to absorb more water, and the phase separation method is not carried out on silica to obtain silica. with high hydrophobic properties. Keywords: Biofoam, silica airgel, water absorption  
Analysis of Fine Glass Waste Addition as a Filler Material for Sand Substitution on the Properties of Mortar Products Suharto Suharto; Muhammad Amin; Muhammad Al Muttaqii; Roniyus Marjunus; Nuzullia Fitri; Suhartono Suhartono
TEKNIK Vol 42, No 3 (2021)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i3.32686

Abstract

Inorganic glass waste can replace sand in mortar production due to its SiO2 content being greater than 70%. This study aims to analyze the increase in mortal product agility due to the substitution of sand and reducing environmental pollution. The fine glass waste used is restrained on 80 and 120 mesh sieves. The fine glass waste substitution variations are 0, 10, 20, 30, 40, and 50% of the sand weight. The results show that fine glass waste could be used as a material for sand substitution because of the content of SiO2 of 73.8%. The results from XRD indicate that the phase of fine waste glass is amorphous. The mortar was printed with a 5x5x5 cm cube mold, and it was soaked for 7, 14, and 21 days. Based on the results, the compressive strength with a high value of 13.58 MPa at 20% fine glass waste substitution and 120 mesh. The density of 2.8±0.8 g/cm3, porosity 4.40±0.001%, and absorption 2.83±0,0009%. The compressive strengths, density, porosity, absorption, XRF and XRD characterization were evaluated. The results showed that the SiO2 compound in waste glass with the right composition of 20% could significantly increase the compressive strength. Phase formation of Calcite (CaCO3), Quartz (SiO2), and Portlandite (Ca(OH)2) was formed from the results of XRF characterization
Co-Authors Ade Setiawan Agus Riyanto Chandra Gumilang Muhammad Al Muttaqii Muhammad Amin Nuzullia Fitri Suharto Suharto Suhartono Suhartono Suprihatin Suprihatin Sutiarno