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All Journal Indonesian Journal of Chemistry Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.)
Yusuf Bramastya Apriliyanto
Department of Chemistry, Bogor Agricultural University, Chemistry Building, Wing 1, 3rd Floor, Tanjung St., IPB Darmaga Campus, Bogor 16680, Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry

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Enhancing Thermal and Mechanical Properties of UHMWPE/HA Composite as Tibial Tray Yusuf Bramastya Apriliyanto; Sri Sugiarti; Sulistioso Giat Sukaryo
Indonesian Journal of Chemistry Vol 20, No 3 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (551.859 KB) | DOI: 10.22146/ijc.44086

Abstract

A bearing material in an artificial knee joint has to have good thermal and mechanical properties to prevent wear in order to be used as a tibial tray. Despite its well-known good properties, ultrahigh molecular weight polyethylene (UHMWPE) still needs to be modified to enhance its physical strength in its use in artificial joints. In this research, composites made from UHMWPE and hydroxyapatite (HA) were prepared by mechanical alloying and hot press method and their thermal and mechanical properties were modified using gamma rays. The composites were prepared using various HA loading ratios and irradiated using gamma rays at doses of 0, 25, 50, and 75 kGy. The effects of HA loading and gamma irradiation on thermal and mechanical properties were studied by various methods. The results showed that the addition of HA enhanced the hardness of UHMWPE by 8–15% and the maximum stress up to 38%. Gamma irradiation enhanced the crystallinity by 113–172%, the melting point by 0.6–0.7%, and decreased the break elongation of composites by 23–48%. Addition of polyvinyl alcohol (5% w/w) in composites reduced their rigidity by 16–47% and hardness by 3–9%.
Novel Absorber Material Design Based on Thiazole Derivatives Using DFT/TD-DFT Calculation Methods for High-Performance Dye Sensitized Solar Cell Naufan Nurrosyid; Mirad Fahri; Yusuf Bramastya Apriliyanto; Rahmat Basuki
Indonesian Journal of Chemical Studies Vol. 1 No. 1 (2022): Indones. J. Chem. Stud., June 2022
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (362.122 KB) | DOI: 10.55749/ijcs.v1i1.5

Abstract

Thiazole derivative molecules with a low energy gap have been successfully designed using the DFT/TD-DFT calculation methods. The calculations were simulated by adding varied numbers of thiophenes (1, 2, 3, and 10) and electron donating molecules of –H, -NH2, -OCH3, and –COOH in the ethanol solvent. The best thiazole derivative was the molecule constructed using a long-conjugated bridge of 10-thiophenes, the carboxyl anchoring site, and an amine addition as the electron donating molecule with an energy gap of 1.66 eV and a strong UV-Vis absorption in the red light region (673.20 nm). These designed molecules are beneficial to be applied in the equator area such as Indonesia. Further, the profound effects of the thiophene bridge in terms of the structural and energy gaps, and the variation of electron-donating molecules affected the photonic properties have been demonstrated in this paper.
Co-Authors Mirad Fahri Naufan Nurrosyid Rahmat Basuki Sri Sugiarti Sulistioso Giat Sukaryo