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All Journal Jurnal Teknologi Pertanian Andalas METAL : Jurnal Sistem Mekanik dan Termal Journal of Applied Agricultural Science and Technology Journal of Fibers and Polymer Composites
Firman Ridwan
Jurusan Teknik Mesin, Universitas Andalas
Agriculture, Biological Sciences & Forestry Automotive Engineering Computer Science & IT Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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The Effect of Aluminum Addition Ratio as Filling Material of PLA Toward PLA Filament Electrical Conductivity on 3D Printing Applications Firman Ridwan; Zuliantoni Zuliantoni
METAL: Jurnal Sistem Mekanik dan Termal Vol 8, No 1 (2024): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.8.1.1-5.2024

Abstract

 The electronic waste of daily electronic goods evokes environmental pollution because electronic waste is difficult to decompose in nature and it is also toxic to the environment and humans. The way to minimize environmental pollution from electronic waste is by making polymer composites for conductive material purposes. Polylactic acid (PLA) has the potential as a polymer matrix. PLA has a non-toxic advantage and it is easily decomposed in nature because PLA is made from organic material.The extruder machine is used to make PLA filament with aluminum filling. When made the filaments, the ratio of each mixture was varied to obtain a filament with a mixture ratio that produced the best conductivity. The four-point probe test tool is used to measure the resistivity of each specimen to find out which specimen with the mixture ratio has the best conductivity value.The electrical conductivity obtained from the ratio of 10% Al is 6.78 S/m; 20% Al is 10 S/m; 30% Al is 31.44 S/m; 40% Al is 24.15 S/m. The best electrical conductivity results was obtained in the 70% PLA and 30% Al mixture ratio with an electrical conductivity value is 31.44 S/m while the lowest electrical conductivity was obtained in the 90% PLA and 10% Al mixture ratio with an electrical conductivity value is 6.67 S/m
The Effect of Using Cellulose Nanofiber from Kapok (Ceiba pentandra, L) as Reinforcement on The Properties of Recycled Papers Rezekinta, Fransiska Angelina; Kasim, Anwar; Syafri, Edi; Ridwan , Firman; Chaniago , Irawati; Ichiura, Hideaki
Journal of Applied Agricultural Science and Technology Vol. 8 No. 4 (2024): Journal of Applied Agricultural Science and Technology
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jaast.v8i4.327

Abstract

Recycling is important for achieving environmentally sustainable products and waste reduction. The trend has led to the addition of reinforcement to recycling process to ensure the effective usage of wasted papers. Therefore, this study was conducted to determine the effect of using cellulose nanofiber (CNF) synthesized from kapok fibers as reinforcement in recycled papers. CNF was applied at different concentrations of 2, 4, 6, 8, and 10% of recycled paper production and the analysis was conducted by testing tensile index, density, and brightness. Moreover, X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and UV-Vis analysis were used to determine the characteristics of the paper. The results showed that CNF addition influenced tensile index, brightness, and density of recycled papers. This was observed from an increase in tensile strength by up to 76.32% and density at approximately 0.58 g/cm3 for 10% CNF addition. Meanwhile, the brightness level was reduced due to the compact nature of paper produced. The trend led to the conclusion that the addition of CNF could impact the characteristics of recycled papers.
Enhancement of Aluminum-Air Battery Performance Using Rice Husk-Derived Carbon Quantum Dots and Carbon Nanotubes Zakky, Muhammad Ammar; Ridwan, Firman; Agusto, Dean Bilalwa; Wismalqi, Wismalqi; Gusriwandi, Gusriwandi
Journal of Fibers and Polymer Composites Vol. 4 No. 2 (2025): Journal of Fibers and Polymer Composites
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jfpc.v4i2.403

Abstract

The development of sustainable, high-performance energy storage systems is crucial for addressing the challenges associated with renewable energy integration and the limitations of conventional lithium-ion batteries. This study investigated the potential of an innovative electrolyte membrane for aluminum-air batteries, incorporating carbon quantum dots (CQDs) derived from rice husk charcoal and carbon nanotubes (CNTs) within a polyvinyl alcohol (PVA) matrix. CQDs were synthesized using a microwave-assisted technique, and CNTs were added to enhance the structural and conductive properties of the membranes. Three distinct membrane compositions were prepared: a base solution of PVA, HCl, and glycerol; a base solution with CQDs; and a base solution with CQDs and CNTs. Fourier Transform-Infrared (FT-IR) spectroscopy revealed enhanced intermolecular interactions and successful integration of the carbon nanomaterials within the polymer network. X-ray diffraction (XRD) analysis indicated a reduction in crystallite size from 11.27 nm (base membrane) to 9.65 nm (–14.36%) with CQDs and further to 8.29 nm (–26.47%) with CQDs + CNTs, suggesting improved amorphous characteristics that reinforce the membrane structure and facilitate ionic conductivity. Electrochemical impedance spectroscopy (EIS) demonstrated an increase in ionic conductivity from 4.98501 mS/cm (base membrane) to 5.51837 mS/cm with CQDs and 6.35292 mS/cm (+27.4%) with CQDs + CNTs. These findings highlight the synergistic effect of CQDs and CNTs in optimizing the ion migration pathways and charge transport within the electrolyte membrane. The utilization of rice husk charcoal as a precursor for CQDs aligns with sustainable practices and promotes the use of renewable resources. This study presents a promising approach for the development of advanced electrolyte membranes for aluminum-air batteries, contributing to efficient, environmentally friendly, and cost-effective energy storage solutions.
The Effect of Aluminum Addition Ratio as Filling Material of PLA Toward PLA Filament Electrical Conductivity on 3D Printing Applications Ridwan, Firman; Zuliantoni, Zuliantoni
METAL: Jurnal Sistem Mekanik dan Termal Vol. 8 No. 1 (2024): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.8.1.1-5.2024

Abstract

 The electronic waste of daily electronic goods evokes environmental pollution because electronic waste is difficult to decompose in nature and it is also toxic to the environment and humans. The way to minimize environmental pollution from electronic waste is by making polymer composites for conductive material purposes. Polylactic acid (PLA) has the potential as a polymer matrix. PLA has a non-toxic advantage and it is easily decomposed in nature because PLA is made from organic material.The extruder machine is used to make PLA filament with aluminum filling. When made the filaments, the ratio of each mixture was varied to obtain a filament with a mixture ratio that produced the best conductivity. The four-point probe test tool is used to measure the resistivity of each specimen to find out which specimen with the mixture ratio has the best conductivity value.The electrical conductivity obtained from the ratio of 10% Al is 6.78 S/m; 20% Al is 10 S/m; 30% Al is 31.44 S/m; 40% Al is 24.15 S/m. The best electrical conductivity results was obtained in the 70% PLA and 30% Al mixture ratio with an electrical conductivity value is 31.44 S/m while the lowest electrical conductivity was obtained in the 90% PLA and 10% Al mixture ratio with an electrical conductivity value is 6.67 S/m
E-NOVEL PRODUKSI FILM PATI: KARAKTERISASI PRODUKSI FILM PATI DARI LIMA JENIS PATI BERBEDA Rezekinta, Angelina; Kasim, Anwar; Syafri, Edi; Chaniago, Irawati; Ridwan, Firman
Jurnal Teknologi Pertanian Andalas Vol 27 No 2 (2023)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jtpa.27.2.259-266.2023

Abstract

The process of producing starch film using the casting method required a significant amount of time to obtain the desired film product. Therefore, this study was conducted to reduce the production time required for the starch film. The study used five varieties of starch: bengkoang starch, talas starch, glutinous rice flour, wheat flour, and MOCAF flour. The process involved homogenizing the starch and glycerol mixture utilizing a stirrer, followed by heating using a microwave and a compression process to accelerate the evaporation of water in the starch film. For the final drying stage, samples that had gone through this process were dried using a cabinet dryer. The result showed that the developed method of starch film requires only 60 minutes of the time needed compared to conventional casting method, which usually takes 5-48 hours. Furthermore, it was observed that starch film production using glutinous rice flour resulted in the highest tensile strength.
Enhancing Ionic Conductivity and Stability of Electrolyte Membranes: A Study on CQD-GO Composites for Aluminum-Air Batteries Ezi Puspita Dewi; Ridwan, Firman; Agusto , Dean Bilalwa; Wismalqi; Gusriwandi
METAL: Jurnal Sistem Mekanik dan Termal Vol. 9 No. 2 (2025): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.9.2.78-88.2025

Abstract

The development of efficient and sustainable energy storage technologies is crucial to address the depletion of fossil fuels and environmental pollution. This study focuses on the synthesis and characterization of a novel electrolyte membrane based on the integration of Carbon Quantum Dots (CQDs) derived from coconut-shell charcoal into a Graphene Oxide (GO) matrix for application in aluminum-air batteries. The CQDs were synthesized using a simple, low-cost, and environmentally friendly hydrothermal method, whereas the GO-based membrane was prepared via a solution casting technique. The physical and electrochemical properties of the resulting CQD-GO composite membranes were systematically investigated using various characterization techniques, including Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Electrochemical Impedance Spectroscopy (EIS), and Scanning Electron Microscopy (SEM). The results revealed that the incorporation of CQDs significantly enhanced the ionic conductivity, reduced the internal resistance, and improved the interfacial stability of the membrane compared with pristine GO. The synergistic effect between the CQDs and GO was attributed to the formation of hybrid conductive pathways and the enhanced ion mobility within the membrane structure. Furthermore, the CQD-GO membrane exhibited excellent stability in the electrochemical environment typically encountered in aluminum-air batteries. These findings highlight the potential of integrating biomass-derived CQDs with GO to develop high-performance electrolyte membranes for advanced energy storage applications, paving the way for more efficient and environmentally friendly aluminum-air batteries.
Co-Authors Abral, Hairul Ade Hendra Agusto , Dean Bilalwa Agusto, Dean Bilalwa Aminuyati Angelina Rezekinta Anwar Kasim Anwar Kasim Arif Novriheldi Benny Dwika Leonanda Chaniago , Irawati Diki Zuhury Edi Syafri Edi Syafri Eka Satria Ezi Puspita Dewi Fico Trianda Ravelli Fransiska Angelina Rezekinta Gusriwandi Gusriwandi Gusriwandi Hendery Dahlan, Hendery Ichiura, Hideaki Irawati Chaniago Muhammad Yusra R Mutya Ratna Wardani Refki Harvendri Rezekinta, Angelina Rezekinta, Fransiska Angelina Ryan Rahman Syafri, Edi Wismalqi Wismalqi, Wismalqi Yul Hizhar Zakky, Muhammad Ammar Zuliantoni, Zuliantoni