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All Journal Rotasi Science and Technology Indonesia
Lamura, M. Danny Pratama
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics

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Analisis Perbandingan Kontak Mekanik pada Permukaan Sinusoidal dengan Variasi Kondisi Pelumasan Menggunakan Metode Elemen Hingga Anwar, Syaiful; Lamura, M. Danny Pratama; Jamari, Jamari; Bayuseno, Athanasius Priharyoto
ROTASI Vol 27, No 1 (2025): VOLUME 27, NOMOR 1, JANUARI 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.1.1-7

Abstract

Studi tentang kontak antara dua permukaan sangat menarik untuk dipelajari karena berhubungan dengan gesekan, pelumasan, dan keausan. Mekanika kontak berperan sangat penting dalam bidang tribologi. Penelitian ini bertujuan untuk mengetahui fenomena-fenomena yang terjadi pada pemodelan entrapped oil dalam kondisi kontak kering dan kontak berpelumas pada geometri sinusoidal. Proses simulasi dilakukan menggunakan Finite Element Method (FEM) dengan bantuan software Abaqus CAE 2020. Bentuk geometri dimodelkan sebagai axisymmetric 2D dengan ukuran elemen 0,01 untuk plat kaku dan 0,0005 untuk model geometri. Penelitian dilakukan pada model dengan ketinggian 2 mm dan memiliki kedalaman cavity 0,02 mm yang diberikan tekanan (0,5 MPa - 640 MPa) dari bawah model. Penelitian ini meninjau hasil von Mises stress, contact area, dan deformasi pada setiap kondisi variasi. Hasil penelitian menunjukkan bahwa model sinusoidal pada kontak berpelumas menghasilkan nilai von Mises stress, contact area, dan deformasi yang lebih kecil dibandingkan model sinusoidal pada kontak kering. Pada parameter tegangan von Mises, variasi kondisi pelumasan yang diterapkan menghasilkan perbedaan sebesar 28,41%. Sementara itu, untuk parameter area kontak dan deformasi, perbedaan kondisi pelumasan memberikan perbedaan hasil masing-masing sebesar 42,79% dan 16,46%. Analisis ini sangat penting bagi para peneliti untuk memahami pengaruh signifikan pelumas dalam kontak mekanik.
Preparation of Polyacrylonitrile-Polyethersulfone Nanofibers Loaded with Reduced Graphene Oxide from Palm Kernel Shell forWastewater Filtration Dani, Rahma; Almafie, Muhammad Rama; Mataram, Agung; Lamura, M. Danny Pratama; Akhsan, Hamdi; Marlina, Leni; Fudholi, Ahmad; Ismail, Ahmad Fauzi; Sriyanti, Ida
Science and Technology Indonesia Vol. 11 No. 2 (2026): April
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.2026.11.2.457-480

Abstract

The development of Polyacrylonitrile (PAN)–Polyethersulfone (PES) nanofiber membranes loaded with Reduced Graphene Oxide (rGO) offers an innovative and sustainable solution for water filtration. This study synthesized and characterized PAN–PES loaded rGO nanofiber membranes using an electrospinning technique. A PAN–PES mixture (8:2 mass ratio) at 10–20 wt% served as the matrix, with 48 mg of rGO added. The membranes were analyzed using scanning electron microscopy, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), mechanical testing, water absorption, immersion resistance, and clean water permeability (CWP). The resulting nanofibers exhibited defect-free, bead-free, and uniform morphology with diameters ranging from 389 to 757 nm. FTIR confirmed hydrogen bonding between PAN–PES and rGO, while XRD showed sharp peaks with a maximum crystallinity of 33.52%. The membrane displayed a Young’s modulus of 57.83 MPa and remained stable after 32 days of immersion. It demonstrated superhydrophilic behavior with a contact angle of 72.4o to 74.3o, sustaining a stable water flux at 6.0 bar for 60 min, yielding a permeability of 3.25 to 23 L/m2.h.bar and an equilibrium water content of 69 to 91%. Surface morphology before and after wastewater filtration revealed effective contaminant capture and strong antifouling resistance. These results confirm that PAN–PES loaded rGO nanofiber membranes possess excellent mechanical stability, high permeability, and superior wettability, providing a promising pathway for advanced, sustainable water filtration applications.
Co-Authors Agung Mataram Ahmad Fauzi Ismail Ahmad Fudholi Almafie, Muhammad Rama Atanasius Priharyoto Bayuseno Dani, Rahma Hamdi Akhsan Ida Sriyanti J. Jamari Leni Marlina Syaiful Anwar