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All Journal Jurnal Fisika dan Terapannya GEMBIRA (Pengabdian Kepada Masyarakat) Hayyan Journal
Sukmawati Said
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Religion Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Education Engineering Law, Crime, Criminology & Criminal Justice Medicine & Pharmacology Physics Social Sciences

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Sintesis Koloid Nanopartikel Bismut: Peran Citrus limon dan Optimasi Daya serta Waktu Pemanasan Gelombang Mikro Utami, Ni Wayan Mega Savira; Wahyuna Nur; Sukmawati Said
JFT : Jurnal Fisika dan Terapannya Vol 12 No 2 (2025)
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v12i2.60550

Abstract

This study successfully synthesized bismuth nanoparticle colloids using citrus limon extract through a microwave heating method. Microwave heating was used as the main factor controlling the particle formation process, so variations in power and heating time were examined to determine their effect on the characteristics of the resulting nanoparticles. The synthesis was carried out by dissolving bismuth powder (Bi(NO₃)₃·5H₂O) into citrus limon extract. The mixture was then heated using microwaves at powers of 100, 300, 450, 600, and 800 W for 1, 3, 5, 7, and 10 minutes. Characterization was performed using UV-Vis, XRD, and TEM to observe the optical properties, crystal structure, and particle morphology and size. The results show that the optimum condition was achieved at 800 W for 5 minutes, marked by a change in the color of the solution to black and maximum absorbance at a wavelength of 272 nm (2,680 a.u.). XRD analysis showed diffraction peaks at 2θ = 27.4°; 38.1°; and 40.0°, corresponding to the hkl planes (012), (104), and (110), confirming the characteristic trigonal crystalline structure of bismuth based on JCPDS standard No. 44-1246. TEM images show a dominant spherical particle morphology with an average size of 33.19 nm. These results prove that microwave heating is capable of accelerating and stabilizing the synthesis of citrus limon extract-based bismuth nanoparticle colloids, producing stable nanoparticles with good morphology.
A Comparative Study of Nanocellulose Isolation Methods from Palm Fiber for Functional Material Applications Sukmawati Said; Mega Savira Utami, Ni Wayan; Nur, Wahyuna
Hayyan Journal Vol. 3 No. 1 (2026): February
Publisher : Education and Talent Development Center of Indonesia (ETDC Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51574/hayyan.v3i1.4818

Abstract

The high cellulose content and abundance of oil palm fiber make it an exceptionally promising sustainable source for nanocellulose production in advanced material science. This study executes a thorough comparative analysis of different isolation strategies covering chemical, mechanical, and enzymatic approaches to derive nanocellulose specifically for functional material development. We aim to clarify how each distinct isolation path dictates the final structural integrity, morphology, and thermal stability of the extracted nanocellulose. By synthesizing data through a systematic literature review, this research evaluates critical metrics such as the crystallinity index and fiber diameter, which directly influence the performance of functional composites. Our analysis reveals that while chemical techniques like acid hydrolysis are superior for achieving high crystallinity, mechanical processes like high-pressure homogenization provide enhanced aspect ratios despite their heavy energy demands. Additionally, enzymatic methods offer a greener pathway, though they often trade speed for environmental benefits. Ultimately, this comparative review serves as a strategic roadmap for researchers to select the most appropriate isolation method based on intended applications, ranging from high-strength bio-composites to flexible electronic components.
PELATIHAN PEMBUATAN LILIN SEDERHANA UNTUK MENGHEMAT ENERGI PADA MALAM HARI DI PANTI ASUHAN NURSIAMATU KOTA MAKASSAR Sukmawati Said; Ihfa Indira Nurnaifah; Ni Wayan Mega Savira Utami; Wahyuna Nur
Jurnal Gembira: Pengabdian Kepada Masyarakat Vol 4 No 02 (2026): APRIL 2026
Publisher : Media Inovasi Pendidikan dan Publikasi

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Abstract

Program Pengabdian kepada Masyarakat (PKM) ini bertujuan untuk memberikan keterampilan praktis sekaligus meningkatkan pemahaman mengenai konservasi energi bagi penghuni Panti Asuhan Nursiamatu di Kota Makassar. Konsumsi listrik yang tinggi pada malam hari seringkali menjadi beban operasional bagi lembaga sosial. Metode yang digunakan dalam kegiatan ini adalah lokakarya partisipatif, yang terdiri dari pemaparan teori dasar fisika pembakaran dan praktik langsung pembuatan lilin dengan bahan yang mudah didapat. Peserta dilatih untuk memformulasi lilin yang tahan lama sebagai sumber penerangan alternatif saat pemadaman listrik atau penggunaan terbatas di malam hari. Hasil kegiatan menunjukkan peningkatan signifikan pada keterampilan peserta (85%) dan kesadaran yang lebih baik terhadap efisiensi energi. Inisiatif ini tidak hanya menawarkan solusi teknis untuk penerangan, tetapi juga menumbuhkan semangat kewirausahaan dan kemandirian bagi anak-anak panti asuhan.
Co-Authors Ihfa Indira Nurnaifah Mega Savira Utami, Ni Wayan Ni Wayan Mega Savira Utami Nur, Wahyuna Utami, Ni Wayan Mega Savira Wahyuna Nur