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All Journal Program Kreativitas Mahasiswa - Penelitian Jurnal Aplikasi Fisika KOVALEN: Jurnal Riset Kimia ALCHEMY Jurnal Penelitian Kimia DedikasiMU: Journal of Community Service Einstein's: Research Journal of Applied Physics Jurnal Pengabdian Kepada Masyarakat (JAPIMAS) Jurnal Analis Kesehatan Kendari Jurnal Aplikasi Fisika International Journal of Acta Material
La Agusu
Department Of Physic, Faculty Of Mathematics And Natural Sciences, Halu Oleo University, Kampus Hijau Bumi Tridharma, Anduonohu, Kendari, Sulawesi Tenggara 93232, Indonesia
Religion Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Social Sciences

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Investigation of the Mineral Content of Laterite Soil and Nickel Ore in the Nickel Mining Area of PT Vendoura Inti Perkasa, Bahodopi District, Morowali Regency W. S. Nurjannah; L. Agusu; R. Eso
International Journal of Acta Material Vol. 2 No. 2 (2026): February 2026
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i2.25

Abstract

This study aims to identify and analyze the mineral composition of lateritic soils in a nickel mining area. Sampling was conducted vertically at 50 cm intervals, reaching 700 cm and covering four laterite soil layers: topsoil, limonite, saprolite, and bedrock. The materials were dried, crushed, and sieved using a 200-mesh screen. The samples were then analyzed for elemental content using X-ray fluorescence (XRF) and for mineral composition using X-ray diffraction (XRD). The XRF results show that SiO₂ and MgO are more concentrated in the bedrock and saprolite layers, while Fe and Al₂O₃ are more dominant in the topsoil and limonite layers. The presence of goethite (hydroxide) in the limonite layer at both points indicates hydrated iron oxides typical of lateritic profiles. Hematite (oxide) was found in the limonite rock at Point 1, while antigorite and chrysotile (silicates) were found at Point 2. In the saprolite layer, hematite was identified at Point 1 and goethite at Point 2. In the bedrock, lizardite was found at Point 1 and olivine at Point 2, suggesting a parent material of weathered ultramafic or metamorphic origin. The presence of goethite confirms typical characteristics of lateritic soils rich in hydrated iron oxides.
Synthesis and Characterization of NaOH-Doped ZnO Metal Oxide Thin Films for Electron Transport Layer in Dye-Sensitized Solar Cells (DSSCs) W. S. Arsyad; H. A. Hangkea; I. Saleh; I N. Sudiana; L. Agusu; I. Usman
International Journal of Acta Material Vol. 2 No. 2 (2026): February 2026
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i2.30

Abstract

Research on the manufacture of ZnO thin films as electron transport layers has been carried out. The ZnO coating was prepared by sol-gel method. At the time of making the solution precursor, the doping given was 0.72%, 1.09%, and 1.45% by weight. Each hkl index changes at an angle of 2θ which causes the mean crystal size to decrease from 57.57 nm, 35.94 nm to 24.01 nm for doping concentrations of 0.72%, 1.09% and 1.45%, respectively. The measurement results using the LCR meter show that the resistance of the ZnO thin layer increases with the addition of NaOH doping from 125.49 Ω.cm, 462.93 Ω.cm and 3192.8 Ω.cm for doping are 0.72%, 1.09% and 1.45% NaOH respectively. The results of the analysis of the UV-Vis spectrometer, the slit energy value decreased with the increase in the doping of NaOH given, namely 2.03 eV, 2.026 eV, 2.025 eV and 2.024 for samples without doping are 0.72%, 1.09% and 1.45% sequentially. The results of the morphological analysis using SEM showed that the grains with sizes and shapes tended to be the same in all thin film samples.
UJI AKTIVITAS ANTIOKSIDAN SENYAWA METABOLIT SEKUNDER DARI EKSTRAK KULIT BATANG PALIASA (Kleinhovia hospita Linn) Imran; Angga Febrian; Zainal Syam Arifin; Thamrin Azis; I Wayan Sutapa; Nohong; La Agusu; Syahrir; Alwahab
Jurnal Analis Kesehatan Kendari Vol. 7 No. 2 (2025): Jurnal Analis Kesehatan Kendari : June 2025
Publisher : Politeknik Bina Husada Kendari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46356/jakk.v7i2.351

Abstract

This study aims to test the antioxidant activity of secondary metabolite compounds contained in paliasa (Kleinhovia hospita Linn) stem bark extract. This plant is traditionally known to have health benefits, but research on the antioxidant activity of its stem bark is still limited. Extraction was done using a maceration method using a methanol solvent, followed by liquid-liquid fractionation using n-hexane and ethyl acetate to separate compounds based on their polarity. Phytochemical screening showed that the n-hexane fraction contained alkaloids and terpenoids, while the ethyl acetate fraction contained alkaloids, flavonoids, tannins, and saponins. The antioxidant activity of both fractions was tested using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) method with absorbance measurements at a wavelength of 517 nm. The test results showed that the ethyl acetate fraction had an IC50 value of 51.7687 ppm, while the n-hexane fraction had an IC50 value of 60.5442 ppm. Based on the classification of antioxidant activity, both fractions are categorized as strong antioxidants (IC50 between 50-100 ppm). For comparison, vitamin C has an IC50 value of 14.3421 ppm, indicating strong antioxidant activity. The results of this study indicate that paliasa bark extract, especially the ethyl acetate fraction, has the potential as a source of natural antioxidants that can be further developed in the pharmaceutical, cosmetic, and food industries as an alternative to synthetic antioxidants with toxicity risks.
Co-Authors . Yuliana A. J. Muhammad A. Ndita A. T. Nurwahida Ahmad Zaeni Al Jalali Muhammad Alimin Alimin Alimin Alimin Alimin, Alimin Alwahab Amiruddin Andi Tendri Ampa Andi Tenri Ampa Angga Febrian Ardin Anton Arman C. C. N. Taswito Darwin Ismail Elfianti. A, Warda F. Nishimura F. S. Palobang Fahmiati Fahmiati Fitrianti Gusti Adhi Wibawa H. A. Hangkea H. Kikuchi Herdianto Herdianto Husein Husein I Nyoman Sudiana I P. A. Karya I W. Sutapa I Wayan Sutapa I. Saleh I. Saleh I. Usman IDA USMAN Imran Imran Imran Imran Indriana Kartini Intan Intan Irawati Irawati Ismail Saleh K. Nakagawa Karmila Karmila Kasman L. Ardan L. O. M. Darusman L. O. Rusman L.A. Kadir La Aba La Aba La Ode Ahmad La Ode Ahmad Nur Ramadhan La Ode Rusman La Ode Rusman La Ode Safiuddin La Ode Safiuddin Lina Lestari M. Nalis M. Nalis M. Z. Muzakkar M.Pd Prof. Dr. I Nyoman Sudiana . Mardiana Napirah Muhammad Anas Muhammad Arohman Muhammad Zamrun F Mukhsar . Muzakkar, Muhammad Zakir Ni Putu Sri Widiasih Nohong Nurlian Oktavian, Putri R. Eso Risal Day Rosliana Eso Ruslan Ruslan S. Misudo S. Mitsudo Saenuddin, Saenuddin Safaani, Jamhir Sri Juari Santosa Syahrir T. Asano T. Azis T. Iwamoto T. Nishiumi Tahir THAMRIN AZIS W. O. Nurtia W. O. Sukmawati W. S. Arsyad W. S. Arsyad W. S. Nurjannah Waode Sukmawati Arsyad Y. Fujii Y. Ishikawa Y. Ishikawa Y. Tatematsu Y. Terui Yahya Yahya Yuliana Yuliana Yumna Wati Yustin Biringgalo Zainal Syam Arifin