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All Journal Jurnal Teknik ITS Jurnal Matematika & Sains Program Kreativitas Mahasiswa - Karsa Cipta JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN Syntax Literate: Jurnal Ilmiah Indonesia INFOKUM Eduvest - Journal of Universal Studies Sewagati
Sutarsis Sutarsis
Institut Teknologi Sepuluh Nopember Surabaya
Aerospace Engineering Arts Humanities Computer Science & IT Education Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Mechanical Engineering Neuroscience Public Health Social Sciences Other

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Synthesis of PLA/PLGA Biocomposite with Variation of Silane Coupling Agent as Reinforcement for Bone Plate Applications Hartanto, Denny; Purniawan, Agung; Sutarsis, Sutarsis
Syntax Literate Jurnal Ilmiah Indonesia
Publisher : Syntax Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/syntax-literate.v10i4.58624

Abstract

This research investigated the synthesis of polylactic acid (PLA) and poly(lactic co-glycolic acid) (PLGA) bio-composites with nano-hydroxyapatite (nHA) fillers for bone plate applications, focusing on the effects of different silane coupling agents and polymer ratios. The research analyzed how various silane coupling agents (3-MPS, APTES, Vinyl Silane) and PLA compositions influenced structural, morphological, mechanical, biodegradation, and biocompatibility properties. Materials were characterized using FTIR, SEM, tensile and compression testing, weight loss analysis, and MTT assay. FTIR confirmed successful nHA surface modification with silane agents through the presence of Si-O-Si and NH2 functional groups. SEM revealed that Vinyl Silane produced samples with fewer voids and better filler distribution, while increased PLGA content resulted in more homogeneous structures. Mechanical testing demonstrated that composites with Vinyl Silane exhibited superior tensile (6.98 MPa) and compressive strength (8.19 MPa), while samples with 20% PLGA content achieved the highest values (7.18 MPa tensile, 8.28 MPa compressive). Biodegradation analysis showed that PPnHA8020-APTS samples achieved optimal degradation time (5.1 months), aligning with bone healing timelines. All bio composites demonstrated cell viability above 80%, exceeding ISO 10993-5 standards, with PPnHA9010-APTS showing the highest biocompatibility (86.76%). The research established that optimized PLA/PLGA/nHA bio composites, particularly with Vinyl Silane coupling agent and 20% PLGA content, offer promising properties for biodegradable bone implant applications, combining adequate mechanical strength with appropriate degradation rates and excellent biocompatibility.
ELECTROCHEMICAL PERFORMANCES OF NITROGEN-DOPED CARBON/MNO2 COMPOSITE SUPERCAPACITOR ELECTRODE IN KI-ADDED NA2SO4 ELECTROLYTE Sutarsis, Sutarsis; Abyan, Demas Muhammad; Kussuma, Fahrul Ardian Firmanda; Pradesar, Yusuf; Purniawan, Agung
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 2 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i2.77816

Abstract

In this study, Nitrogen-doped Activated Carbons (NAC) with different Nitrogen concentrations (NAC1, NAC2, NAC3) and Manganese Dioxide (MnO2) were composited to make the hybrid active material for supercapacitor electrodes to improve the energy density of NAC by adding the pseudo-redox capacitive properties of NAC/MnO2 composite electrode. NAC active material was made from the pyrolyzing biomass carbon and Polyaniline mixture at 800 °C in a nitrogen atmosphere for 2 hours. NAC/MnO2 hybrid material was synthesized by heating NAC: MnO2 with a ratio of 5:1 at 400 °C for 2 hours. Peaks analysis of X-ray diffraction of NAC/MnO2 powder shows that the MnO2 phase was formed as a composite with NAC. The electrochemical performance of the NAC3/MnO2 electrode exhibited the highest capacitance of 168 Fg-1 at a scan rate of 5 mVs-1 in Potassium Iodide (KI)-added Na2SO4 electrolyte. According to the Cycle Voltammetry (CV) measurement, the NAC3/MNO2 composite electrode shows hybrid capacitive behavior consisting of pseudo-redox and double-layer electrostatic energy storage mechanisms in KI-added Na2SO4 electrolyte. NAC3/MnO2 composite electrode demonstrates a high energy density of 22 Whkg-1 at 5 mVs-1.
Innovative Investigation and Strategy for Improving the Performance of 70% Alumina Refractory Roofs Against Thermal-Slag Corrosion and Extreme Temperatures in Electric Arc Furnaces (EAF) in the Nickel Matte Production Process Rohadi, Anggoro; Sulistijono, Sulistijono; Noerochim, Lukman; Sutarsis, Sutarsis; Purwaningsih, Hariyati
Eduvest - Journal of Universal Studies Vol. 5 No. 12 (2025): Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v5i12.52513

Abstract

This study investigates the performance of 70% alumina refractories on the roof of an Electric Arc Furnace (EAF) in the nickel matte smelting process. The methods used include material characterization through X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), and Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX), thermodynamic simulation using FactSage, and thermal stress simulation based on Finite Element Analysis (FEA). The results of the study show a significant decrease in Al₂O₃ content to below 16% in the corrosion zone, as well as an increase in Fe₂O₃ which triggers the formation of corrosive hercynite (FeAl₂O₄) and magnesium spinel (MgAl₂O₄) phases. FactSage simulations confirmed the stability of these phases at temperatures of 1200–1400 °C. FEA results identified maximum stress concentrations in the central zone of the roof, approaching the strength limit of the refractory material. Based on these findings, the proposed mitigation strategies include: optimizing the brick geometry design to reduce stress (most realistic in the short term), increasing the alumina content and decreasing Fe₂O₃ in the refractory material (potentially effective, but requires economic evaluation), and controlling the furnace temperature distribution (most technically challenging). This study provides a comprehensive approach to designing more reliable and durable EAF refractories.
Co-Authors Abdul Ghofur Abyan, Demas Muhammad Addien Wahyu Wiranata Agung Purniawan Agung Purniawan, Agung Alfreda Krisna Altama Amaliya Rasyida Dian Mughni Fellicia Frengki Mohamad Felayati Hariyati Purwaningsih Hartanto, Denny Indra Bagas Pramasta Jatimurti, Wikan Kussuma, Fahrul Ardian Firmanda Lukman Noerochim Moh Faried Pradesar, Yusuf Rieco Malik Darmawan Rizky Akbar Wiradhika Rochman Rochiem Rohadi, Anggoro Royyan Wafi Pujiyanto Salsah, Rizka Putri Sony Junianto Sulistijono Sulistijono Vicky, Widia Anggia Widia Anggia Vicky Winarto Hadi Candra Yan Alamanda Ilfahmi Yogie Arisandi Trisnawan