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All Journal Journal of Mechanical Engineering Science and Technology Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Jurnal Bakti Masyarakat Manajemen Bhinneka Multidisiplin Journal
Tumpal Ojahan Rajagukguk
mahasiswa pasca sarjana program studi mesin fakultas teknik unsri
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Journal : Bhinneka Multidisiplin Journal

 1 
STUDI KASUS MORFOLOGI NANOFIBER POLIVINIL ALKOHOL (PVA) TERHADAP HIDROFOBISITAS PERMUKAAN YANG DINILAI DENGAN PENGUKURAN SUDUT KONTAK Berly, Yoga Maharesha; Rajagukguk, Tumpal Ojahan; Hendronursito, Yusup
Bhinneka Multidisiplin Journal Vol. 2 No. 4 (2025): Bhinneka Multidisiplin Journal
Publisher : Yayasan Education and Social Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53067/bmj.v2i4.71

Abstract

Nanofiber is a fiber measuring nanometers to micrometers, often used in the medical, energy, filtration, and other fields. The formation of nanofiber with the main ingredient, namely Polyvinyl Alcohol (PVA), this is because of its biodegradable, biocompatible, and chemically stable properties, but has the weakness of being easily degraded when in contact with water. This study examines the effect of electrospinning parameters on the morphology of 10% w/v PVA nanofiber, with parameters namely voltage of 10 and 12 kV, nozzle-collector distance of 10 and 15 cm. Morphological testing was carried out using a Field Emission-Scanning Electron Microscope (FE-SEM) and Contact Angle (CA) test. The test results show that PVA nanofiber has a fiber diameter with a value of NFZ.1; 80 - 406 nm, NFZ.2; 61.7 - 248.9 nm, with a continuous fiber structure and without significant defects, the resulting contact angle value of NFZ.1; 50.05o and NFZ.2; 38.75o, the contact angle value of NFZ.1 is higher than NFZ.2. The nanofiber with the smallest diameter is NFZ.2 and the largest contact angle value is NFZ.1. The results of this research show that the morphology of nanofiber significantly influences the contact angle value.
PENGARUH TEMPERATUR SINTERING KAOLIN PADA BATA TAHAN API TERHADAP UJI DENSITAS, POROSITAS DAN KUAT TEKAN Ahmiyati, Yusniar; Rajagukguk, Tumpal Ojahan
Bhinneka Multidisiplin Journal Vol. 3 No. 2 (2026): Bhinneka Multidisiplin Journal
Publisher : Yayasan Education and Social Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53067/bmj.v3i2.109

Abstract

Fire bricks possess the ability to withstand high temperatures; however, repeated use beyond their capacity can lead to failure. As construction materials, fire bricks maintain their shape and strength at extremely high temperatures. Kaolin is a natural mineral belonging to the clay group, with kaolinite as its primary constituent. The decomposition of kaolinite into metakaolinite occurs between 400 and 630°C, and metakaolin gradually promotes the formation of mullite crystals. Alumina is one of the most widely used raw materials in refractory applications due to its high heat resistance, as well as its resistance to erosion and corrosion. This study aims to analyze fire bricks produced by sintering kaolin at 700°C, while varying the compositions of kaolin, alumina, and chamotte, followed by firing at 1300°C. Density test results indicate that Sample 3 yielded the best value of 2.14 g/cm³. Porosity test results show that Sample 3 achieved the optimal value of 16.4%. Compressive strength test results demonstrate that Sample 3 produced the highest value of 34.79 N/mm². This research has the potential to serve as an alternative solution for developing fire bricks applicable in the petrochemical industry, iron and steel production, boilers, power plants, ceramics, glass, and other sectors.
Co-Authors Ahmiyati, Yusniar Anang Ansyori Anshori, Anang Berly, Yoga Maharesha Candra Birawidha, David Hadi, Agung Efriyo Herdianton, Hecci Ibrahim, Fauzi Marjuni, Teuku Prastyo, Adi Yunanto, Asep Yusup Hendronursito, Yusup