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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Journal of Technomaterial Physics
Dini Rizqi Dwi Kunti Siregar
Universitas Syiah Kuala
Astronomy Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Porous Ceramics: The Role of Coffee Grounds and Rice Husk Ash in Physical and Mechanical Properties Fauzi; Evi Yufita; Afwandi Taga S; Rinaldi Romar; Musvira; Dini Rizqi Dwi Kunti Siregar; Endi Suhendi; Elin Yusibani
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 15 No. 2 (2025)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v15n2.p117-131

Abstract

This research investigates the role of spent coffee grounds (SCGs) and rice husk ash (RHA) as additives in clay mixtures for the production of porous ceramics. Three sample variations were tested. The first involved mixing SCGs with clay in weight percentages of 0:100, 5:95, 10:90, 15:85 and 20:80 %wt, using particles sized between 80 and 100 mesh. In the second variation, SCGs were replaced with RHA in similar proportions. The third variation used a fixed 10%wt SCG content, combined with varying RHA percentages (0, 5, 10, 15 and 20)%wt. Physical properties (density, porosity, water absorption) and mechanical properties (compressive strength) were evaluated. The results show that increasing the proportion of organic filler significantly decreases both density and compressive strength—by up to 45% and 97%, respectively—due to the reduced clay content. Conversely, porosity and water content increase with higher filler content. Among all samples, the clay–RHA mixture exhibited the highest compressive strength. Meanwhile, the combination of SCGs with 10%RHA produced ceramics with the lowest density, indicating the most porous structure.
Real-Time Ethanol Monitoring System for Palm Sap Fermentation Using a MiCS-5524 Gas Sensor and Arduino Uno Dini Rizqi Dwi Kunti Siregar; M Syukri Surbakti; Fadhli; zakaria; Susilawati; Hikmal Akbar
Journal of Technomaterial Physics Vol. 8 No. 1 (2026): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v8i1.23866

Abstract

This study aims to develop a real-time alcohol monitoring instrument for palm sap fermentation using the MiCS-5524 gas sensor integrated with an Arduino Uno. The system consists of the MiCS-5524 sensor, an Arduino Uno microcontroller, and a 16×2 I2C LCD for real-time display. Sensor calibration was performed using ethanol solutions at 10%, 20%, 30%, 40%, 50% and 60% to establish a linear regression model relating sensor resistance to ethanol concentration. Fermentation monitoring was carried out for 72 hours, with measurements taken every 24 hours. Sensor outputs were converted from ADC values into voltage, resistance, and ethanol concentration using the calibration equation. The calibration yielded a strong linear correlation (R² = 0.982). Fermentation tests showed a consistent increase in ethanol concentration, reaching 53.9% after 72 hours. Comparison with a digital alcohol meter produced relative errors ranging from 2.8% to 6.4%, demonstrating good accuracy, low drift, and stable sensor response. Overall, the developed instrument effectively measures ethanol concentration in palm sap fermentation in real time. Its simple configuration, low cost, and reliable performance make it suitable for small-scale palm sap processing, quality control, and laboratory applications. Further improvements, such as environmental compensation and IoT-based monitoring, are recommended to enhance system performance.
Co-Authors Afwandi Taga S Elin Yusibani Endi Suhendi Evi Yufita Fadhli Fauzi Fauzi Hikmal Akbar M Syukri Surbakti Musvira Rinaldi Romar Susilawati zakaria