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All Journal Science and Technology Indonesia Indonesian Journal of Chemistry Journal of Community Service and Empowerment Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) Babakti : Journal of Community Engangement
Yusuf Bramastya Apriliyanto
Department of Chemistry, Bogor Agricultural University, Chemistry Building, Wing 1, 3rd Floor, Tanjung St., IPB Darmaga Campus, Bogor 16680, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Environmental Science Materials Science & Nanotechnology Physics Social Sciences Other

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Journal : Indonesian Journal of Chemistry

 1 
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%.
Immobilization of Cerium(IV) Oxide onto Reduced Graphene Oxide in Epoxy Resin Matrix as Radar Absorbing Composite for X-band Region Bolilanga, Patricya Inggrid Wilhelmina; Basuki, Rahmat; Apriliyanto, Yusuf Bramastya; Prasojo, Agus Eko; Lazuardy, Ardyan; Anitasari, Reza; Putri, Riyanti; Sasongko, Nugroho Adi; Santiko, Arief Budi
Indonesian Journal of Chemistry Vol 24, No 6 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.94404

Abstract

The rGO/CeO2/epoxy composite has been successfully prepared as radar absorbing material (RAM) for the X-band (8–12 GHz) region. The reduced graphene oxide (rGO) originated from pencil graphite oxide (GiO) was synthesized through the modified Hummer method. The synthesis of rGO/CeO2/epoxy was conducted by immobilization of cerium(IV) oxide into rGO (rGO/CeO2) via hydrothermal method and followed by composited the rGO/CeO2 with epoxy resin matrix. Morphological analysis by SEM-EDX indicates that the rGO/CeO2 structure appears to be a tangled layer of edges randomly aggregated, and CeO2 is uniformly anchored on the rGO surface. From the diffractogram result of the XRD instrument, rGO exhibits changes in crystallinity, indicating a transformation of the interlayer structure from multilayer GiO to a single layer of rGO. The presence of Ce–O was indicated at wavenumber 553 cm−1 of rGO/CeO2 by FTIR. The microwave absorbing performance of rGO/CeO2/epoxy conducted by vector network analyzer (VNA) showed that the RL value of the composite was −3.22 dB (47% of electromagnetic wave absorption) at a frequency of 9.25 GHz at the thickness of 1 mm composite. The composite has the promising prospect of being developed as a captivating candidate for the new type of microwave absorptive materials.
Co-Authors Ananda, Dea Dwi Anggi Khairina H H ANGGI KHAIRINA HANUM HASIBUAN Anitasari, Reza Arief Budi Santiko, Arief Budi ARIYANTI, DITA Aura Puja Lestari Azimatur Rahmi Bolilanga, Patricya Inggrid Wilhelmina Cahyorini Kusumawardani Dewi Anggraini S Elva Stiawan Fahri, Mirad Gunaryo Ida Ayu Putu Sri Widnyani Istiqomah, Tiara Jati, Andreas Ary Chrisna Kurniadi, Tedi Lazuardy, Ardyan M. Sulthon Nurharmansyah P Mayori, Ersha Mentari Zikri Anty Minandre Wiratama Mirad Fahri Moch. Rizki Fajri Nareswari, Vania Agatha Noviyan Darmawan Nugroho Sasongko Jati, Nugroho Sasongko Nurrosyid, Naufan Prasojo, Agus Eko Putra, M. Sulthon Nurharmansyah Putri, Riyanti Rahmat Basuki Rahmawati, Fani Salsabila, Fidela Aurellia Sandri, Azzahra Septaningsih, Dewi Sulistioso Giat Sukaryo Tedi Kurniadi Tiarani, Sekar Ilma Wiana, Regita Andriani Yunita, Amalia