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All Journal Reaktor Jurnal Kimia Riset Industria: Jurnal Teknologi dan Manajemen Agroindustri Indonesian Journal of Biotechnology and Biodiversity Jurnal Teknik Kimia Indonesia Makara Journal of Technology Prosiding Seminar Nasional Rekayasa dan Teknologi (TAU SNAR- TEK) Jurnal Polimesin
Praswasti Pembangun Dyah Kencana Wulan
Departemen Teknik Kimia, Fakultas Teknik, Universitas Indonesia
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EVALUATING ACETONE AND METHANOL FOR ELECTROPHORETIC DEPOSITION OF SS 316L COATED WITH HYDROXYAPATITE/MULTIWALLED CARBON NANOTUBES DENTAL IMPLANTS: A FOCUS ON CORROSION RESISTANCE Valmelina, Ersyi Arini; Wulan, Praswasti Pembangun Dyah Kencana; Whulanza, Yudan; Adin, Mehmet Şükrü
Jurnal Kimia Riset Vol. 9 No. 1 (2024): June
Publisher : Universitas Airlangga, Campus C Mulyorejo, Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkr.v9i1.56784

Abstract

Dental implants offer a reliable solution for replacing damaged tooth roots. This research investigates the comparative performance of acetone and methanol as suspension media in the fabrication of stainless steel type 316L-based dental implants using the Electrophoretic Deposition (EPD) method, a technique known for its simplicity and cost-effectiveness. Voltage variations of 20V, 30V, and 40V were applied to both acetone and methanol suspensions for a duration of 20 minutes. The morphology of the Hydroxyapatite/Multiwalled Carbon Nanotube (HA/MWCNT) coatings was meticulously characterized using Scanning Electron Microscopy (SEM). Corrosion resistance was evaluated through Potentiodynamic Polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS) techniques. Remarkably, at 30V, a homogeneous and crack-free coating was achieved, demonstrating superior corrosion resistance. This was further corroborated by the resistance values of 23.891 Ω and 114.990 Ω for the acetone and methanol samples, respectively. Additionally, the corrosion rates of 0.075 (mmpy) and 0.0004 (mmpy) for the acetone and methanol samples further emphasized the superiority of methanol as a suspension medium. These findings unequivocally establish methanol as the optimal choice for achieving superior deposition quality and corrosion resistance in the context of the EPD method for stainless steel type 316L-based dental implants.
Hydrogen co-firing simulation for emission reduction and efficiency in an 880 MW combined cycle power plant Mulyadi, Eka Octaviyatna; Wulan, Praswasti PDK
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.6735

Abstract

This study evaluates the environmental and performance impacts of hydrogen co-firing with natural gas in an 880 MW Combined Cycle Power Plant (CCPP) in Jakarta, Indonesia. CO₂ emissions were estimated using the IPCC Tier-2 Method, while Aspen Plus simulation analyzed combustion performance under 10% and 20% hydrogen blending. Fuel composition was determined through Gas Chromatography analysis and processed using a weighted average method. The results show that hydrogen blending significantly reduces CO₂ emissions to approximately 10% at 10% hydrogen and 20% at 20% hydrogen, equivalent to 409,420 tons annually. NOₓ emissions increased moderately, by about 2.16% at 20% hydrogen, due to higher flame temperatures, yet remained far below  regulatory limit of 400 mg/Nm³. Thermal efficiency improved from 54.08% (baseline) to 56.88% and 60.06% with 10% and 20% hydrogen, respectively, although net power output slightly declined. These findings highlight the role of hydrogen as a transitional energy carrier, capable of decarbonizing gas-fired power plants while improving efficiency with manageable environmental trade-offs. Although the study is based on steady-state simulations without pilot-scale validation, the integration of actual operational data strengthens its applicability. Hydrogen co-firing presents a technically viable pathway for reducing CO₂ emissions in the power sector.
Co-Authors Adin, Mehmet Şükrü Anindya Adiwardhana Anondho Wijanarko Desi Heltina Dianursanti Eva Fathul Karamah Fajril Ambia Hanung Adi Nugroho Hardi Putra Heri Hermansyah Hidayanto, Ariyo Prabowo Irvina Kamalitha Zunaidi Ismail Marzuki Josia Simanjuntak Josia Simanjuntak Kamarza Mulia, Kamarza Kitakawa, Naomi Shibasaki Maemonah, Maemonah Mahmud Sudibandriyo Misri Gozan Mohammad Nasikin Momoji Kubo Momoji Kubo, Momoji Mubarokah Nuriaini Dewi Mulyadi, Eka Octaviyatna Muryanto Muryanto Muryanto Muryanto, Muryanto Naomi Shibasaki-Kitakawa Naomi Shibasaki-Kitakawa, Naomi Prolessara Prasodjo, Prolessara Rita Arbianti Roekmijati Soemantojo Roekmijati Soemantojo, Roekmijati Roekmijati W. Soemantojo Roekmijati W. Soemantojo, Roekmijati W. Safaat, Muhammad Slamet . Soemantojo, Roekmijati Widaningroem Tania Surya Utami Tiara Aninditha Toshiy Yonemoto Toshiy Yonemoto, Toshiy Valmelina, Ersyi Arini Vita Andrianty Vita Andrianty, Vita Wahyu Widodo Widodo W Purwanto Widodo Wahyu Purwanto Widodo Wahyu Purwanto Wijanarko, A. Yudan Whulanza Yuliusman Yuliusman Yuswan Muharam