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All Journal Science and Technology Indonesia Journal of Science and Applicative Technology Indonesian Mining Journal Jurnal Ilmu Fisika ALKIMIA : Jurnal Ilmu Kimia dan Terapan Jurnal Teori dan Aplikasi Fisika JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI Logic : Jurnal Rancang Bangun Dan Teknologi Indonesian Mining Journal
Sipahutar, Wahyu Solafide
Program Studi Teknik Material, Institut Teknologi Sumatera, Lampung Selatan 35365, Indonesia
Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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Binder Influence on Barium Hexaferrite: Comparative Analysis of PVA and Silicone Rubber in Sintered Magnets Sipahutar, Wahyu Solafide; Putrie, Gustya Salma; Putri, Faiza Armalia; Farhan, Abi; Hafid, Muhamad
Jurnal Ilmu Fisika Vol 17 No 2 (2025): September 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.2.135-145.2025

Abstract

This study explores the impact of binder types—polyvinyl alcohol (PVA) and silicone rubber (SR)—on the physical, magnetic, and mechanical properties of barium hexaferrite (BaFe12O19), synthesized via mechanical alloying and sintered at 1100°C. SEM-EDX confirmed the formation of BaFe12O19 with an average particle size of around 0.7 µm. VSM results showed a saturation magnetization (Ms) of 71.17 emu/g, remanent magnetization (Mr) of 47.8 emu/g, and coercivity (Hc) of 0.33 T. The addition of PVA reduced density (3.13–3.07 g/cm³), increased porosity (17.72%–18.47%), and decreased magnetization (0.93–0.80 mT). In contrast, SR enhanced densification, leading to higher density (3.65–3.57 g/cm³), lower porosity (6.95%–7.51%), and significantly higher hardness (232.9–438.92 HV). SR also improved mechanical strength, while PVA proved more effective in reducing shrinkage and improving magnetization. These results underscore the significant role of binder type and concentration in optimizing the properties of sintered barium hexaferrite, with SR excelling in mechanical strength and PVA in magnetization.
The Effect of Volume Fraction Variation on The Mechanical Properties of Epoxy-based Sugarcane Fiber Composites Anisa Fitri; Bayu Prasetya; Muhammad Yasin Siregar; Ahmad Andryan Prakoso; Wahyu Solafide Sipahutar
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 2 (2025): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i2.85-92

Abstract

The use of natural fibers as reinforcement in composite materials offers an environmentally friendly alternative to synthetic fibers. Among them, sugarcane fiber (bagasse), an agro-industrial byproduct rich in cellulose, hemicellulose, and lignin, holds considerable potential but remains underutilized. This study aims to evaluate the effect of varying sugarcane fiber volume fractions (50%, 60%, and 70%) on the mechanical properties of epoxy resin-based composites. The composites were fabricated using the hand lay-up method, followed by mechanical testing including tensile tests (ASTM D3039) and bending tests (ASTM D790). The results showed that the highest tensile strength of 26.43 MPa was achieved by the E70 sample, while the E50 sample exhibited the highest bending strength at 142.53 MPa. Fractographic analysis revealed that structural defects such as voids, fiber pull-out, and debonding significantly influenced the mechanical performance of the composites. While fiber volume fraction has a notable impact on tensile and bending strengths, the relationship is not strictly linear due to variations in fiber-resin distribution and interfacial bonding quality. These findings suggest that sugarcane fiber-based epoxy composites, particularly with a 50% volume fraction, have strong potential for application in lightweight structural components, furniture panels, or automotive interior parts. Future research may focus on improving interfacial bonding through chemical treatments or hybridization with other natural fibers to further enhance performance.
Eyebrow Cream Preparation Formulation Based on Activated Carbon from Elaeis guineensis Jacq. Shells Annisaa Siti Zulaicha; Deviana Safitri; Iwan Syahjoko Saputra; Wahyu Solafide Sipahutar; Yunita Fahni
ALKIMIA Vol 10 No 1 (2026): ALKIMIA
Publisher : SCIENCE AND TECHNOLOGY FACULTY OF UNIVERSITAS ISLAM NEGERI RADEN FATAH PALEMBANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19109/7p42db04

Abstract

This study aims to utilize palm kernel shell waste as a source of activated carbon for the formulation of safe and sustainable eyebrow cream. Activated carbon was obtained through pyrolysis and physical activation at 800°C, then characterized using proximate analysis, SEM-EDX, XRD, and FTIR to determine its structure, composition, and purity. The characterization results showed that the activated carbon had 100% carbon purity, a porous amorphous structure, and a predominance of C=C groups, indicating a non-polar surface with high adsorptive potential. The activated carbon was then formulated into four variations of eyebrow cream using the hot emulsification method and evaluated through organoleptic, homogeneity, pH, and smudge resistance tests. All formulas showed physical stability for four weeks, a semi-solid texture, homogeneity without granules, and increased color with increasing activated carbon concentration. The pH value of all formulas was 5, within the safe range for skin. This study shows that palm kernel shell activated carbon not only meets the characteristics of stable and safe cosmetic pigments but also provides a natural coloring alternative that supports the concepts of clean beauty, green cosmetics, and the circular economy. Thus, palm kernel shell waste activated carbon has great potential to be developed as an active ingredient in decorative cosmetics, particularly natural-based eyebrow creams.
Pengaruh waktu milling terhadap Sifat mikro struktur dan magnet dari NdFeB dengan proses Wet dan Dry milling Wahyu Solafide Sipahutar; William Wiliiam; Muljadi Muljadi
Jurnal Teori dan Aplikasi Fisika Vol. 9 No. 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.265

Abstract

Making of magnets from NdFeB flakes by Wet and dry milling to determine the microstructure, physical and magnetic properties of the milling time variation is 16, 24, and 48 hours. The milling powder is then analysed to determine the particle size with PSA and XRD to determine the phase formed. Then the compacting process with isotropy printing for making pellet test samples with a pressure of 7 tons for 2 minutes. Then the pellet sample, given annealing temperature with a variation of 150 and 170 ?C, then a measurement of magnetic properties with a Gauss Meter. The results obtained by the smallest optimum particle size with 48 hours of milling time at a diameter of 90% 4.7 ?m, while the results of dry milling at a diameter of 90% amounted to 60.85 ?m. The best method to get the smallest particle size is the Wet milling method. XRD results with Wet and Dry milling phases that appear only Nd2Fe14B phase. As milling time increases, the resulting density increases. The largest magnetic flux testing with dry milling method with 48 hours of milling time for temperatures 170 ?C temperature obtained 468.5 Gauss and the addition of annealing temperature the magnetic properties of the material is getting better.
Cellulose Impact on Bioplastic Performance: A Study on Mechanical Strength, Physical Properties, and Degradation of Water Hyacinth and Kepok Banana Peel-derived Materials Faiza Armalia Putri; Aditya Rianjanu; Wahyu Solafide Sipahutar
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 02 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i02.407

Abstract

Plastics, primarily made of synthetic polymers, are difficult to degrade by microbes, resulting in waste management challenges. Bioplastics are a viable alternative to conventional plastics' environmental problems. They are crucial for circular economy transformation and sustainability goals. To address this issue, researchers investigated the formation of bioplastics from kepok banana peels (Musa acuminata) and water hyacinth (Eichhornia crassipes). This study will investigate the mechanical properties, degradation rate, water absorption, and functional groups of these bioplastics. Various cellulose concentrations (0%, 4%, 8%, 12%, and 16%) are used throughout the manufacture. The results show that cellulose content has a substantial influence on the mechanical characteristics, degradation rate, and water absorption of bioplastics. Bioplastics having 12% cellulose had the best mechanical properties with a tensile strength of 2.551 MPa. Bioplastics containing 4% cellulose, on the other hand, degrade the fastest, losing 63.181% of their mass. This high degradation rate corresponds to the maximum amount of water absorption, which reaches 54.93%. Furthermore, the FTIR study shows that no novel functional groups were discovered in the bioplastics. In conclusion, using kepok banana peel starch and water hyacinth to generate bioplastics shows potential as a solution to the problems that traditional plastics face. This research shows that changing the cellulose content in bioplastics can cause changes in mechanical qualities, breakdown rate, and water absorption. More studies in this area might pave the way for more ecologically friendly and sustainable alternatives to existing plastics. Keywords: Bioplastic, Banana peel starch, Water hyacinth, Cellulose, FTIR  
Co-Authors Abdul Muhyi Aditya Rianjanu Ahmad Andryan Prakoso Andryan Prakoso, Ahmad Anisa Fitri Anisa Fitri Anisa Fitri Anisa Fitri Annisaa Siti Zulaicha Anrokhi, Mohamad Samsul Astri Aulia Suwanda Azwar Manaf Bahfie, Fathan Bayu Prasetya Bayu Prasetya Deviana Safitri Diah Susanti Eka Nurfani Erik Prasetyo Fahmi, Achmad Gus Faiza Armalia Putri Fajar Aditya Julyatmojo Fajar Nurjaman Farhan, Abi Fathar Fathan Mubin Fathar Fathan Mubina Hadi Teguh Yudistira, Hadi Teguh Hafid, Muhamad Haloho, Trivendi Hanifah, Istiara Rizqillah Iwan Syahjoko Saputra Kardo Rajagukguk, Kardo Mochamad Ghulam Isaq Khan Muhamad Fatikul Arif Muhammad Saeful Fadlan Muhammad Yasin Siregar Muhammad Yasin Siregar Muljadi Muljadi Oji Kuncoro Darma Putra Okky Fajar Tri Maryana Pasaribu, Joshua Leonardo Phasa, Agita Prasetya, Bayu Putra, Oji Kuncoro Darma Putri, Faiza Armalia Putrie, Gustya Salma Quratul Aini Rianjanu, Aditya Rio Ardiansyah Murda Risa Nurin Baiti Riyan Ferdiyanto Sena Maulana Tarmizi Taher Widi Astuti William Wiliiam Yunita Fahni