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All Journal Jurnal Rekayasa Material, Manufaktur & Energi EINSTEIN (E-JOURNAL)
., Masthura
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Aerospace Engineering Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Karakteristik Arang Kulit Durian Dan Daun Jenggelan Untuk Pembuatan Tinta Organik Ramadhani, Devi Rezky; ., Masthura; Husnah, Miftahul
Rekayasa Material, Manufaktur dan Energi Vol 7, No 2: Juli 2024
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v7i2.18962

Abstract

Printing inks contain dyes, adhesives, lubricants, plastics, surfactants and other substances. Chemical-based inks have carcinogenic, toxic, and corrosive properties that cause breathing difficulties and dizziness in humans when the substance is vaporized and inhaled, disorders of the brain, liver, and nervous system if inhaled for a long time. So an organic ink innovation is needed. This study aims (i) to determine whether durian peel charcoal and janggelan leaves can be used as a basic material for making organic ink. (ii) To determine the characteristics of organic ink made from durian skin and janggelan leaves. (iii) To determine the optimum composition of durian skin charcoal and janggelan leaves. The tests carried out are density, viscosity, surface tension and Fourier Transform Infrared (FTIR). The results obtained show that the organic ink that can be used is with a sample composition of 5 grams of durian skin charcoal, 1.5 grams of janggelan leaf extract, 96% alcohol 15 ml and distilled water 20 ml. With ink density value of 0.92 gr/cm3, viscosity value of 3.88 Cp, surface tension value of 45.802 dyne/cm. The functional groups of organic ink that have been studied are OH, CO, C=O, C ≅ C.
Material Nanopartikel Fotokatalis Fe3O4/SiO2/TiO2 Untuk Degradasi Methylene Blue Lenni, Nurma; Lubis, Ridwan Yusuf; ., Masthura
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.21752

Abstract

This study aims to synthesize Fe3O4/SiO2/TiO2 photocatalytic material using the coprecipitation method with variations in calcination temperature and to investigate the effect of calcination temperature on the material characteristics as well as its ability to degrade methylene blue. The photocatalytic material was synthesized with a mass ratio of Fe3O4/SiO2/TiO2 of 3:2:2 and calcined at temperatures of 500 ˚C, 550 ˚C, and 600 ˚C. The material characterization was performed using X-Ray Diffractometer (XRD), Scanning Electron Microscope (SEM), and Ultraviolet-Visible (UV-Vis) Spectrophotometer. XRD results showed that increasing the calcination temperature led to an increase in crystal size from 28.01 nm at 500˚C to 30.06 nm at 600˚C. SEM analysis revealed morphological changes with an increase in particle size and agglomeration at higher temperatures, resulting in a denser and more porous surface. UV-Vis results showed that the FST600 sample, calcined at 600˚C, exhibited the highest methylene blue degradation rate, at 99.26%. This study demonstrates that higher calcination temperatures improve crystal size, enhance morphology, and increase the photocatalytic performance of Fe3O4/SiO2/TiO2 in methylene blue degradation.
VARIATION OF POTATO STARCH AND BAGASSE CELLULOSE ON THE PHYSICAL AND MECHANICAL PROPERTIES OF BIOPLASTICS Sulkha, Amalia; ., Masthura; Jumiati, Ety
EINSTEIN (e-Journal) Vol. 12 No. 3 (2024): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ein.v12i3.62280

Abstract

Bioplastics are ordinary plastics that can be used, but can be decomposed by microorganisms, so they are environmentally friendly. The aim of this research is to determine the characteristics of potato starch and bagasse cellulose bioplastics and to determine variations that produce compositional characteristics with the best quality for making bioplastics using potato starch and bagasse cellulose as basic ingredients. Samples A (75% : 25%), B (50% : 50%), and C (25% : 75%) have different compositions of potato starch and bagasse cellulose. To make bioplastic, magenectic is used for one hour at a speed of 500 rpm and a temperature of 80 °C. The size of the mold is 20 x 20 x 1 cm3, and drying is carried out in an oven at 50°C for 12 hours. This research has several tests, namely physical tests including water absorption tests refers to ASTM D570-98, and the biodegradable test follows SNI 7188.7:2016. Test The mechanism includes the tensile strength test of the SNI 06-1315-2006 testing standard.
Co-Authors Jumiati, Ety Lenni, Nurma Lubis, Ridwan Yusuf Miftahul Husnah Ramadhani, Devi Rezky Sulkha, Amalia