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All Journal Jurnal Penelitian Sains Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat 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
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Law, Crime, Criminology & Criminal Justice Mathematics Physics Social Sciences

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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.
Briquettes manufacturing: mechanisation of briquette productions at SME santan coco Saharman Gea; Diana Alemin Barus Diana; Elisa Julianti Elisa; Aditia Warman Aditia
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 2 (2019): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (569.885 KB) | DOI: 10.32734/abdimastalenta.v4i2.3547

Abstract

The fabrication of briquettes is required to be introduced extensively to society in order to provide additional economic value for charcoal crafters to increase their income. The SME Santan Coco as partnership enterprise of community service under supervising of Universitas Sumatera Utara has been producing briquettes since 2018 resulted from waste of coconut milk production. However, the methodology of producing briquettes can be considered to be insufficient. The production is started by the addition of charcoal powder with adhesives compounds which is followed manual stirring. The moulding process involves by using a lever utilizing body-weight, which produces two briquettes. The charcoal powder is obtained by manually crushing the charcoal, so that its granular size is not uniform. The briquette production is very slow due to the equipment used produces two briquettes. On the other hand, the preparation of raw materials into the moulding equipment requires longer time, as well as removing the ready-to-use briquette from the mould. The prepared mixture must be printed immediately, so that the adhesive is not dried. The final product fabricated by the partner shows that the granular sizes are different which affects the density parameters, productions volume accounted for 50 kg per day. Therefore, a mechanism of briquette production is proposed and introduced to the partner, which involves from charcoal breaking, mixing and molding briquettes. A charcoal crusher uses a hammer mill system with 12 eyes, equipped with a filter. The mixing of adhesive substances utilizes a ribbon blade mixing system, while the briquette printing is designed with a screw system. After being implemented, a very significant increase in production up to 500 kg of wet briquettes per day with higher density and more uniform as well as neater granular size has been obtained.
Co-Authors Amir Hamzah Siregar, Amir Hamzah Dellyansyah Dellyansyah Diana Alemin Barus Diana Grace Nainggolan Julianti, Elisa Kerista Sebayang Mahyuni Harahap Perdinan Sinuhaji Saharman Gea Susilawati Syahrul Humaidi, Syahrul