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All Journal Jurnal Penelitian Sains Indonesian Journal of Chemistry
Aditia Warman
Department Of Physics, Faculty Of Mathematics And Natural Sciences, Universitas Sumatera Utara, Jl. Bioteknologi No. 1, Medan 20155, Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Mathematics Physics

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Analisis Sistem Kristal dan Unsur serta Topografi Permukaan Batu Api dengan Metode XRD dan SEM-EDS Perdinan Sinuhaji; Kerista Sebayang; Syahrul Humaidi; Susilawati Susilawati; Aditia Warman
Jurnal Penelitian Sains Vol 19, No 2 (2017)
Publisher : Faculty of Mathtmatics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (305.229 KB) | DOI: 10.56064/jps.v19i2.474

Abstract

Analisis Sistem Kristal dan Unsur serta Topografi Permukaan Batu Api dengan Metode XRD dan SEM-EDSPerdinan Sinuhaji, Kerista Sebayang, Syahrul Humaidi, Susilawati, dan Aditia WarmanFMIPA Universitas Sumatera Utara, Medan, Sumatera Utara, IndonesiaAbstract: A research on the analysis of the crystal system and elements as well as the surface morphology of flint with methods of XRD and SEM-EDS. Flint has a hexagonal crystal system with lattice parameters, a = 4.8850 Å, b = 4.8850 Å and c = 5.3713 Å and  =  = 90o, 120o with  = density  = 3. 957 gr/cm3. Flint from Ende-Flores NTT has elements: oxygen (O) 47.56 Mass%, magnesium (Mg) 6:42 Mass%, aluminium (Al) 5:50 Mass%, silica (Si) 30.63 Mass%, and fe-rum (Fe) 9.90 Mass% with square microstructural irregular, uniform solids.Keywords: flint, elemental composition, microstructure and crystal systemEmail: perdinansinuhaji@gmail.com
Preparation of Biodegradable and Low-Cost Lignin-Based PVOH Carbon Fibers Prepared by Electrospinning Amir Hamzah Siregar; Aditia Warman; Mahyuni Harahap; Grace Nainggolan; Dellyansyah Dellyansyah; Saharman Gea
Indonesian Journal of Chemistry Vol 21, No 6 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.66606

Abstract

A polyvinyl alcohol (PVOH)/lignin nanofiber was prepared by the electrospinning method as a precursor for biodegradable and low-cost carbon fibers. PVOH 15% was dissolved in water, and various concentration of lignin (5, 10, 15, 20, and 25%) was added. The presence of lignin in PVOH solution increased the viscosity and conductivity. From SEM analysis, PVOH solution produced smooth fiber, whereas the addition of lignin produced fibers in bead forms. The presence of lignin above 20% in PVOH did not produce spun-fiber. FTIR analysis confirmed that lignin was able to form hydrogen bonds with PVOH. TGA analysis showed that PVOH/lignin nanofibers had the highest residual mass, i.e., 40% at 600 °C. The morphology of the carbon fibers showed flake forms with many pores and had 58.07% carbon content.
Co-Authors Amir Hamzah Siregar, Amir Hamzah Dellyansyah Dellyansyah Grace Nainggolan Kerista Sebayang Mahyuni Harahap Perdinan Sinuhaji Saharman Gea Susilawati Syahrul Humaidi, Syahrul