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Pengaruh Molaritas dalam Teknik Spray terhadap Performa Fotodetektor Berbasis ZnO Okky Fajar Tri Maryana; Anisa Fitri; Mohamad Samsul Anrokhi; Wahyu Solafide Sipatuhar; Eka Nurfani
Jurnal Teori dan Aplikasi Fisika Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.2706

ZnO:Fe thin films has been successfully carried out by a simple spray pyrolysis method. The thin film was grown on ITO (Indium Tin Oxide) substrate with a metal-semiconductor-metal (MSM) structure. ZnO:Fe thin film characters as photodetector application include morphological structure, and electrical properties. SEM image results show the molarity difference can affect the particle size. The Current-Voltage (I-V) characterization shows that different solvent effects and molarity give different sensitivity. Sample ZnO:Fe 0.5M Ethanol has the highest sensitivity compared to other samples because it has a fairly low current and high bright current.

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 : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.2695

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 μm, while the results of dry milling at a diameter of 90% amounted to 60.85 μm. 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.

Evaluation of surface properties of betung bamboo (Dendrocalmus asper) strands under various heat treatment duration and temperature Risa Nurin Baiti; Sena Maulana; Wahyu Solafide Sipahutar; Rio Ardiansyah Murda; Fajar Aditya Julyatmojo; Astri Aulia Suwanda; Muhammad Saeful Fadlan
Journal of Science and Applicative Technology Vol 5 No 2 (2021): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i2.457

The abundance, rapid growth characteristics and good mechanical properties have made betung bamboo as good alternative materials to replace the slow growing wood. To adress the susceptibility to insects and water attack, the making of bamboo composites, using resin as matrix, has been widely practiced. Thus, the surface properties of bamboo strands are crucial to determine the optimum interaction with resin. This study evaluate the effect of heat treatment to improve the surface properties of bamboo strands, such as the wettability and the color change. Beforehand, the freshly cut bamboo was cut, cleaned and sand-grinded. The heat treatment was done at 140o and 160oC for 1, 2, and 3 hours. After cooling down to room temperature, the contact angle of bambooâ€™s surface was measured by sessile drop methode. The wettability was indicated by constant of contact angle change rate, K. Besides, the change of color was also determined. After the experiments, it was obtained that the bamboo surface tends to be more hydrophobic and has darker color with longer duration of heat treatment. Higher temperature and longer duration of heat treatment can cause more evaporation of liquid inside bamboo and decrease hydrophilicity of the surface.

Analisis Sifat Mekanik dari Struktur Seluler yang Difabrikasi dengan Printer 3D Abdul Muhyi; Riyan Ferdiyanto; Kardo Rajagukguk; Wahyu S. Sipahutar; Muhamad Fatikul Arif
Journal of Science and Applicative Technology Vol 7 No 1 (2023): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v7i1.370

Struktur ringan berbentuk cellular (seluler) atau foam (busa) dalam beberapa tahun terakhir sangat banyak dikembangkan terutama karena perkembangan cepat dari Printer 3D, sehingga desain rumit dapat difabrikasi dengan mudah. Struktur seluler mempunyai rasio kekuatan terhadap massa dan kekakuan yang tinggi, serta dapat diaplikasikan pada struktur ringan dengan ketahanan impak yang tinggi. Dalam tulisan ini, dilakukan uji tekan terhadap enam jenis struktur seluler dengan fraksi volume 10%. Jenis struktur seluler yang divariasikan adalah Cubic, Gyroid, Honeycomb 3D, Rectilinear, Honeycomb, dan Rectilinear 45o. Hasil yang didapat menunjukkan bahwa struktur kompleks jenis Cubic mempunyai kekuatan maksimal terbaik dan juga mempunyai penyerapan energi yang terbaik berdasarkan pengujian yang dilakukan, diikuti dengan struktur Gyroid dan Honeycomb 3D. Struktur yang mempunyai topologi dua dimensi yaitu, Rectilinear 0o, Rectilinear 45o, dan Honeycomb tidak mempunyai kekuatan dan karakteristik penyerapan energi yang baik. Hasil ini dapat digunakan sebagai panduan desain struktur ringan yang mempunyai karakteristik kekuatan dan penyerapan energi mekanik yang tinggi.

DAMPAK PENINGKATAN PANAS DAN JENIS REDUKTAN TERHADAP SAPROLIT: STUDI PENDAHULUAN Bahfie, Fathan; Manaf, Azwar; Astuti, Widi; Nurjaman, Fajar; Prasetyo, Erik; Susanti, Diah; Sipahutar, Wahyu Solafide
Indonesian Mining Journal Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol27.No1.2024.1533

Indonesia significantly contributes to the global electric vehicle battery market due to its substantial medium- and low-grade nickel reserves. This study utilized saprolitic nickel ore from Halmahera, Maluku, Indonesia. However, the research on saprolite needs some improvements due to its complex mineral composition, which affected on the roasting process significantly. Therefore, a thorough understanding of the properties of laterite ores is critically important, particularly concerning laterite pre-reduction processes. The ore was finely sieved to a particle size of less than 100 mesh and then heated at temperatures of 250, 900, and 1150°C with the variation of reductant (anthracite and palm kernel charcoal). Extensive mineralogical analysis was conducted using X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS). The analysis of saprolite showed that it contains about 1.82% nickel, 30.47% iron, 10-20% magnesium, 4.86% aluminum, and 8.1% silicon by weight. Its mineral composition is mainly 53.1% goethite, 38.3% lizardite, and 8.7% quartz. The study found that goethite in saprolite was transformed into hematite around 250°C. At 900°C, the forsterite was crystallized, and at 1150°C, the ferronickel was formed. The transformation of lizardite is important as it affected on nickel diffusion within the iron matrix, which impacted on the material's properties. A thermal upgrading method with reductants like anthracite and palm kernel charcoal was used at lower temperatures to enhance the properties of saprolite. These findings provided valuable insights into saprolite's mineralogical composition and behavior, potentially offering improvements in various industrial processes and applications.

DAMPAK PENINGKATAN PANAS DAN JENIS REDUKTAN TERHADAP SAPROLIT: STUDI PENDAHULUAN Bahfie, Fathan; Manaf, Azwar; Astuti, Widi; Nurjaman, Fajar; Prasetyo, Erik; Susanti, Diah; Sipahutar, Wahyu Solafide
Indonesian Mining Journal Vol 27 No 1 (2024): Indonesian Mining Journal, April 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol27.No1.2024.1533

Indonesia significantly contributes to the global electric vehicle battery market due to its substantial medium- and low-grade nickel reserves. This study utilized saprolitic nickel ore from Halmahera, Maluku, Indonesia. However, the research on saprolite needs some improvements due to its complex mineral composition, which affected on the roasting process significantly. Therefore, a thorough understanding of the properties of laterite ores is critically important, particularly concerning laterite pre-reduction processes. The ore was finely sieved to a particle size of less than 100 mesh and then heated at temperatures of 250, 900, and 1150°C with the variation of reductant (anthracite and palm kernel charcoal). Extensive mineralogical analysis was conducted using X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS). The analysis of saprolite showed that it contains about 1.82% nickel, 30.47% iron, 10-20% magnesium, 4.86% aluminum, and 8.1% silicon by weight. Its mineral composition is mainly 53.1% goethite, 38.3% lizardite, and 8.7% quartz. The study found that goethite in saprolite was transformed into hematite around 250°C. At 900°C, the forsterite was crystallized, and at 1150°C, the ferronickel was formed. The transformation of lizardite is important as it affected on nickel diffusion within the iron matrix, which impacted on the material's properties. A thermal upgrading method with reductants like anthracite and palm kernel charcoal was used at lower temperatures to enhance the properties of saprolite. These findings provided valuable insights into saprolite's mineralogical composition and behavior, potentially offering improvements in various industrial processes and applications.

Electrospun Rare-Earth Metal Oxide (CeO2 ) Nanofiber for the Degradation of Congo Red Aqueous Dyes Rianjanu, Aditya; Haloho, Trivendi; Pasaribu, Joshua Leonardo; Fahmi, Achmad Gus; Nurfani , Eka; Sipahutar, Wahyu Solafide; Yudistira, Hadi Teguh; Taher, Tarmizi
Science and Technology Indonesia Vol. 10 No. 1 (2025): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.1.123-130

The persistent presence of organic dyes like Congo Red (CR) in wastewater poses a significant environmental challenge. In this study, CeO2 nanofibers (CeO2-NF) were successfully synthesized via electrospinning followed by calcination as potential photocatalysts for the degradation of CR pollutants in aqueous solutions. The synthesized nanofibers were characterized using field emission scanning electron microscopy coupled with energy dispersive X-Ray Spectroscopy (FESEM-EDS) for morphological and elemental analyses, X-Ray Diffraction (XRD) for crystalline structure, and Fourier transform infrared (FTIR) spectroscopy for molecular properties. Photocatalytic degradation experiments were conducted under UVC light irradiation, with the CeO2-NF1, CeO2-NF2, and CeO2-NF3 samples achieving CR degradation percentages of 95.6%, 96.9%, and 95.2%, respectively, after 130 minutes of reaction time. Kinetic analysis revealed that the photocatalytic degradation followed pseudo-first-order kinetics, with rate constants of 0.020 min-1, 0.024 min-1, and 0.025 min-1 for CeO2-NF1, CeO2-NF2, and CeO2-NF3, respectively, highlighting the superior performance of CeO2-NF3. These results indicate that CeO2NF could serve as an effective material for the photocatalytic degradation of organic dyes, offering a promising approach for wastewater treatment applications.

Mechanical Properties of Sugarcane Bagasse Fiber Composites: Epoxy vs Polyester Resin Matrices Prasetya, Bayu; Solafide Sipahutar, Wahyu; Andryan Prakoso, Ahmad; Fitri, Anisa
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 01 (2025): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v7i01.186

This study aims to evaluate the mechanical properties of sugarcane bagasse bagasse fiber-reinforced composites using two types of matrix resins (i.e epoxy and polyester). The composites were fabricated using the hand lay-up method, with sugarcane bagasse bagasse fibers serving as the natural reinforcement. The tests conducted included visual fracture analysis, tensile testing, and flexural testing. The results showed that the epoxy-based composite achieved a tensile strength of 26.43 MPa, slightly higher than the polyester-based composite at 26.06 MPa. In the flexural test, the epoxy matrix composite exhibited a flexural strength of 89.53 MPa, significantly higher than the polyester matrix at 49.12 MPa. These findings indicate that the type of matrix resin has a significant influence on the mechanical performance of natural fiber composites, particularly in applications requiring high flexural strength.

Effect of Coconut and Sugarcane Fiber Volume Fraction Variations on the Tensile Properties of Epoxy Matrix Composites Fitri, Anisa; Bayu Prasetya; Muhammad Yasin Siregar; Quratul Aini; Wahyu Solafide Sipahutar; Fathar Fathan Mubina
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 01 (2025): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v7i01.192

Materials are continually being developed for sustainable applications. Agricultural wastes such as sugarcane bagasse and coconut fiber show great potential as reinforcing agents in polymer composites. This study investigates the effect of varying volume fractions of sugarcane and coconut fibers on the tensile properties of epoxy matrix composites. Four fiber composition ratios were prepared, maintaining a total fiber volume fraction of 50% and matrix fraction of 50%, specifically: 25:25, 20:30, 10:40, and 0:50 (coconut fiber: sugarcane fiber, respectively). All fibers underwent alkali treatment using a 5% NaOH solution to improve interfacial bonding with the epoxy matrix. Composite fabrication was performed via hand lay-up, and tensile tests followed ASTM D3039 standards using a Universal Testing Machine (UTM). The results indicated that the composite with 20% coconut fiber and 30% sugarcane fiber (sample B) exhibited the highest tensile strength of 30.48 MPa and the highest elastic modulus of 2.29 GPa, albeit with a low strain at failure (0.01), suggesting brittle behavior. In contrast, the balanced composition (25:25) demonstrated more stable mechanical performance, achieving a tensile strength of 28.31 MPa and a higher strain of 0.04, indicating improved toughness. The lowest tensile strength, 15.56 MPa, was observed in the 10:40 composition (sample C). Failure analysis revealed modes such as matrix cracking, fiber-matrix debonding, and fiber pull-out, which varied according to fiber composition. In conclusion, this study demonstrates that a balanced volume fraction of coconut and sugarcane fibers yields epoxy composites with optimal tensile strength and a favorable balance between strength and toughness.

Tensile Strength of Epoxy Hybrid Composites Reinforced with Coconut and Sugarcane Fibers Siregar, Muhammad Yasin; Fathar Fathan Mubin; Wahyu Solafide Sipahutar; Anisa Fitri; Mochamad Ghulam Isaq Khan
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 02 (2025): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v7i02.193

The use of hybrid composites reinforced with natural fibers has gained increasing attention as a sustainable alternative to synthetic materials, offering advantages in both environmental impact and mechanical performance. This study explores the tensile properties of epoxy-based hybrid composites reinforced with coconut and sugarcane fibers at various volume fractions. The natural fibers were pretreated using a 5% NaOH alkaline solution to enhance interfacial bonding with the matrix. Composite specimens were fabricated by the hand lay-up method, maintaining a total fiber content of 50% and an epoxy matrix of 50%, with varying ratios of coconut to sugarcane fiber. Tensile tests were performed according to ASTM D3039 standards. The results showed that alkali treatment improved fiber wettability, as indicated by a decrease in contact angle, which contributed to stronger fiber-matrix adhesion. The highest ultimate tensile strength (31.02 MPa) was achieved at a 30:20 coconut-to-sugarcane fiber ratio. Hybrid composites with balanced fiber proportions demonstrated superior tensile performance compared to single-fiber composites. These findings indicate that optimizing the ratio of coconut and sugarcane fibers can significantly enhance the mechanical properties of natural fiber-reinforced epoxy composites for engineering applications

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