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I Wayan Sutapa
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International Journal of Acta Material
Published by Universitas Halu Oleo
ISSN : -     EISSN : 30642396     DOI : https://doi.org/10.62749/ijactmat
Core Subject : Science,
Chemistry Materials Science & Nanotechnology Physics
The International Journal of Acta Material (Int. J. Act. Mat) is a bulletin for publishing original and complete papers, short communications as well as review results which aim to disseminate study results (Theoretical or Experiment) to explore of the relationship between processes, structures and properties of the frontier solid and liquid materials. The papers that have the potential for high impact and/or substantially advance the field will be sought. The process studied includes a series of material formation/manufacturing which will be achieved with the instrumentation used. The Journal also addresses a wide variety of subjects that are vital to the field, including but not limited to: Catalysis Material, Membrane Material, Solar cell, Condensed-matter physics, Electronics and device physics material, Absorbent Material, Green chemistry, Information theory and computation material, Nanomaterial, Polymer Material, Quantum physics and quantum technologies, Supramolecular material, Surface chemistry, Theoretical chemistry/physic solid material, Biofuel, Biomass Material.
Arjuna Subject : Ilmu Material (semua kategori) - Ilmu Material (Lain-Lain)
Articles 9 Documents
 1 
Search results for , issue "Vol. 2 No. 2 (2026): February 2026" : 9 Documents clear
Rapid Anisotropic Crystallization from Amorphous Bi₂Te₃ Thin Films by Microwave Annealing K. Nakagawa; T. Iwamoto; I P. A. Karya; A. J. Muhammad; T. Asano; S. Mitsudo; T. Takizawa; M. Takashir
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.v2i2.24

Abstract

We investigated the crystallization behavior of amorphous Bi₂Te₃ thin films subjected to microwave annealing using both slow and rapid heating protocols. Films were deposited by RF magnetron sputtering and annealed with 2.45 GHz microwave irradiation. Slow annealing, performed under controlled temperatures below the melting point of Te, yielded randomly oriented polycrystalline films, whereas rapid annealing with high-power short pulses resulted in strongly c-axis-oriented crystallites. X-ray diffraction (XRD) analyses confirmed enhanced crystallinity and increased Lotgering factors under rapid annealing conditions. SEM observations showed minimal grain growth, suggesting that microwave irradiation promotes preferential orientation without significant grain coarsening. These results indicate that microwave annealing provides a unique, rapid, and effective method for directional crystallization of Bi₂Te₃ thin films, which could significantly enhance their thermoelectric performance.
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.
Green Bioconversion of Asbuton Bitumen into Hydrocarbon-Rich Oil by Trichoderma sp. Based on GC–MS Characterization A. Johan; I. Sulistiyani; A. L. Giri Toba; A. H. Watoni; L. O. A. Nur Ramadhan; C. Baskar; L. O. Ahmad
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.v2i2.27

Abstract

This study presents a green bioconversion process for upgrading Buton natural bitumen (Asbuton) into hydrocarbon-rich bio-oil using Trichoderma sp. as a biological catalyst under mild conditions. The effects of composition ratio and incubation time on oil yield and physicochemical properties were investigated. The optimum condition was achieved at a 2:5 bitumen-to-fungus ratio after 25 days of incubation, producing a 4.74% yield with a density of 0.949 g cm⁻³, a viscosity of 3.83 Pa·s, a flash point of 69.6 °C, and a calorific value of 5412 Cal.g⁻¹. GC–MS analysis revealed forty peaks dominated by C16–C18 fatty acids, confirming the partial oxidative–hydrolytic depolymerization of asphaltic hydrocarbons into oxygenated aliphatic molecules. The decrease in viscosity and the appearance of long-chain fatty acids indicated efficient enzymatic degradation of heavy asphaltenes. These findings demonstrate that Trichoderma sp. effectively converts solid Buton bitumen into bio-oil under ambient conditions, highlighting its potential as a green, low-energy alternative for sustainable biofuel production.
Metamorphic Fasies of Metamorphic Rocks in the Mekongga Complex, Loea Region, East Kolaka Regency, Southeast Sulawesi Province Sugiono; Hasria; S. Asfar; L. O. Ngkoimani; Muliddin
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.v2i2.28

Abstract

Metamorphic rocks in the study area are part of the Mekongga Metamorphic Complex which is Carbon age. It was interpreted as part of the Malihan complex in southeast sulawesi arm. Administratively located in the area of Loea, Kolaka Timur district, Southeast Sulawesi. Geographically located in coordinates 121°53'0"-121°54'30"(BT) and 04°04'0"- 04°05'30" (LS). The purpose of this research is to identify the types of rock and metamorphic facies present in the Loea area. The research sample is used for petrographic analysis to determine rock types and their mineral composition. The result of petrography analysis shows that the study consisted of metamorphic rocks, namely muscovite schist, muscovite-quartz schist, and graphite-quartz schist, has texture in schistose texture, a lepidoblastic mineral form, and mineral composition that consists of quartz, muscovite, biotite, chlorite, graphite, and opaque minerals. Mineralogical data of metamorphic rock indicate that the metamorphic facies in the research area is greenschist, with muscovite, chlorite, and quartz as its constituent minerals, formed at 300˚C-400˚C.
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.
Physicochemical Characterization of Indonesian Natural Clay from Hutumuri, Ambon City, Indonesia as a Low-Cost Porous Material H. Tehubijuluw; E. K. Huliselan; R. Subagyo; R. E. Nugraha; A. A. Jalil; I. W. Sutapa; Rahayu; D. Sri; N.F. Jaafar
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.v2i2.31

Abstract

Natural clays are widely explored as low-cost and sustainable alternatives to synthetic porous materials due to their abundance, structural versatility, and potential for environmental applications. In this study, natural zeolite obtained from Hutumuri Village, Ambon, Indonesia, referred to as Hutumuri Natural Clay (HNC), was prepared and characterized to evaluate its physicochemical properties. The raw material underwent purification, particle size reduction (<2 µm), and chemical activation using hydrochloric acid. Comprehensive characterization was carried out using X-ray fluorescence (XRF), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) surface area analysis. The results revealed that HNC contains high levels of SiO2 and Al2O3, with a Si/Al ratio of 1.1, classifying it as a low-silica zeolite. XRD analysis confirmed quartz as the dominant phase, while FTIR and EDX results supported the presence of silicate, aluminate, and ferrite species. BET analysis showed a surface area of 86.002 m2/g with an average pore diameter of 7.032 nm, indicating mesoporous characteristics. These properties suggest that HNC is a promising candidate for applications in adsorption, catalysis, and other environmental remediation processes.
Potential of Water Hyacinth (Eichornia crassipes) Activated Carbon as Adsorbent for Heavy Metal Pb in Wastewater of Hapsah Hospital Bone Regency S. Kasim; I. Zahrawani
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.v2i2.32

Abstract

The water hyacinth plant is one of the plants that has potential as a bio-adsorbent. Water hyacinth has the ability to absorb heavy metals such as Pb because it has a high cellulose content of 60%, hemicellulose 8%, and lignin 17%, and has been proven effective in dealing with environmental pollution. This study aims to analyze the potential of water hyacinth as an adsorbent of lead metal ions (Pb), determine the initial and final concentration of wastewater that has been adsorbed using water hyacinth adsorbent of lead metal ions (Pb) in the wastewater of Rumah Sakit Hapsah Bone Regency, and characterize water hyacinth activated carbon before and after adsorption. The process of making water hyacinth activated carbon, characterization of water hyacinth activated carbon, analysis of lead metal (Pb) levels in wastewater using SSA, and application of water hyacinth activated carbon to wastewater. The results showed that the initial level of lead metal ions (Pb) in the wastewater of Hapsah Hospital, Bone Regency was 0.68 mg/L, and water hyacinth activated carbon showed optimal adsorption ability at a contact time of 20 minutes and mass of 2 grams. Based on the results of the research that has been done, it can be concluded that the activated carbon produced from water hyacinth has the best quality.
Study of Equilibrium and Kinetics of Ag(I) Metal Ions Adsorption on Carbon Nanofibers and Its Potential Test as X-Ray Anti-Radiation Material L. O. Ahmad; W. O. A. Sulastri; Alimin; L. O. A. N. Ramadhan; H. Ritonga; Alwahab Alwahab; S. J. Sentosa; A. A. Umar
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.v2i2.33

Abstract

X-ray radiation is an electromagnetic wave with short waves and has been widely used in the medical world, if excessive use can cause harm to the body.  The purpose of this research are to know adsorption capacity and kinetics of CNFs adsorption to Ag (I) metal ion and its potential test as X-ray anti-radiation material. This research uses liquid phase adsorption method with the help of ultrasonic wave in the process of attaching metal ion Ag (I) with CNFs as adsorbent. The result,  showed the optimum adsorption process at 60 minutes, pH 8 and concentration of 20 mg/L. Ag(I) metal ions on CNFs maximum adsorption capacity was 398.4064  mg/g, with the adsorption process followed pseudo second order adsorption kinetics model. XRD test results in decreasing intensity after attachment of Ag (I) ions on CNFs and the potentially serve as X-ray anti radiation material.
Adoption of Computational Response Surface Methodology (RSM) in Asphalt Research I W. Sutapa; Hikmayani; G. R. Lempang; L. O. Kadidae; I N. Sudiana; A. Bandjar
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.v2i2.34

Abstract

Response Surface Methodology (RSM) is a powerful statistical and computational tool used to model and optimize complex systems involving multiple variables and responses. In asphalt research, RSM has gained significant attention for its efficiency in optimizing mix design, evaluating modified asphalt properties, and analyzing the effects of processing and environmental conditions. This review highlights the application of RSM in key aspects of asphalt studies, including experimental design (CCD, BBD, factorial), mathematical modeling, response visualization, and multi-response optimization. The use of RSM enables researchers to identify optimal binder content, additive dosage, and process conditions with reduced experimental effort. Additionally, the integration of RSM with contour and 3D surface plots provides intuitive understanding of parameter interactions. Despite its advantages, RSM faces limitations such as model assumptions, sensitivity to data distribution, and challenges in field validation. Future research is encouraged to combine RSM with artificial intelligence techniques for more robust predictions and to validate laboratory models under real-world conditions. Overall, RSM remains a valuable methodology for advancing asphalt technology, especially in the development of sustainable and high-performance pavement materials.  

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