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INDONESIA
Chemistry and Materials
Published by The Center for Science Innovation
ISSN : 2828271X     EISSN : 28282310     DOI : https://doi.org/10.56425/cma
Core Subject : Science,
Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology
Chemistry and Materials is a peer-reviewed journal published by The Center for Science Innovation (Pusat Inovasi Sains). The journal covers all aspects of Chemistry and Materials including synthesis, characterization, and applications. Theoretical and computational studies are also welcome.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 52 Documents
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Synthesis of α-Fe2O3 and α-Fe2O3/SiO2 Composite from Geothermal Waste by Sol-Gel Method and Their Characterization Mulmeyda, Rinda; Reinardo Ramawijaya Widakusuma; Sabrina Putri Chaerani; Agus Purwanto; Rifqi Almusawi Rafsanjani; Habib Muhammad Zapar; Bagaskoro Pranata Ardhi
Chemistry and Materials Vol. 4 No. 1 (2025)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v4i1.91

Abstract

Iron oxide materials, especially hematite (α-Fe2O3), have many important applications. Improving the characteristics and physical properties of hematite has been widely developed, one of which is to combine it as a composite structure with porous materials such as silica (SiO2) as α-Fe2O3/SiO2 composite. This research aims to synthesize α-Fe2O3 particles and α-Fe2O3/SiO2 composites. The α-Fe2O3/SiO2 composite was successfully synthesized by using geothermal waste as an alternative source of silica prepared by the sol-gel method. Both synthesized samples were characterized by X-ray diffraction, scanning electron microscopy equipped with energy dispersive spectroscopy, and X-ray fluorescence techniques. The results showed that silica composites on hematite structure slightly affect the morphology, color, or particle size compared to α-Fe2O3.
Morphology-Dependent Antioxidant Activity of Gold Nanoparticles Prepared Using Different Electrolyte Concentrations Abd Aziz, Azri Farhanah; Suliasih, Babay Asih
Chemistry and Materials Vol. 4 No. 1 (2025)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v4i1.93

Abstract

Antioxidants play a crucial role in protecting the body from oxidative stress by neutralizing free radicals. The synthesis of antioxidant-active materials, such as gold nanoparticles (AuNPs), offers significant advantages due to their unique physicochemical properties. In this study, AuNPs were successfully synthesized using the electrodeposition method on indium-tin oxide substrates, with varying Na₂SO₄ electrolyte concentrations. Scanning electron microscopy analysis confirmed that the synthesized AuNPs exhibited a round to slightly irregular morphology, with an average particle size ranging from 48 to 65 nm. X-ray diffractometer characterization revealed that the nanoparticles possessed a face-centered cubic crystal structure, confirming their high purity. Antioxidant activity was evaluated using the DPPH assay, where AuNPs synthesized with 0.5 M Na₂SO₄ exhibited the highest DPPH inhibition of 72.39%. This enhanced antioxidant performance is attributed to the smaller particle size, which increases the available surface area for free radical neutralization. These findings highlight the potential of electrodeposited AuNPs as effective antioxidants and provide valuable insights into optimizing nanoparticle synthesis for biomedical and nanotechnological applications.

Page 6 of 6 | Total Record : 52

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