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All Journal Jurnal Metalurgi dan Material Indonesia Indonesian Journal of Energy
Adhi Satriyatama
Institut Teknologi Bandung
Automotive Engineering Chemistry Energy Engineering Industrial & Manufacturing Engineering

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Komposit Grafit-Polistirena Diperkuat Poliuretan sebagai Penyerap Gelombang Akustik : Fabrication of Polyurethane Composite Foam with Graphite-Polystyrene Filler for Improved Sound Absorption Adhi Satriyatama; Haris Amaldi; M. Maulana Ibrahim; Aditianto Ramelan
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 3 (2019): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Noise, harshness, and vibration (NHV) are problems encountered when driving a vehicle. This can cause serious problems for drivers if exposed to NHV for a long time. In order to avoid the NHV, vehicle are equipped with acoustic tile which functions to absorb vibration from the sound wave and reduce the noise caused by the vehicle’s engine. Polyurethane foam is commonly used as a sound absorption material because of its high sound absorption efficiency. The study aimed at investigating polystyrene (PS) and graphite (G) fillers with polyurethane matrix for improving acoustic property. The research started with optimization of composite that characterized using sound absorption intensity parameters at frequencies of 50 Hz-6000 Hz, and the optimum results obtained at matrix/filler 92.8%wt. The composite morphology is analyzed using SEM-EDX, optical microscopy, and the density. Mechanical test is conducted using Universal Testing Machine (UTM) and achieved the optimum compressive strength at 60G/40PS with 0.65 MPa. The absorption of acoustic waves property was tested in the frequency range 50 Hz-6300 Hz using an impedance tube and obtained the optimum composition at 0G/100PS.
Facing Indonesia’s Future Energy with Bacterio-Algal Fuel Cells Intan Subadri; Adhi Satriyatama; Ignatius D. M. Budi
Indonesian Journal of Energy Vol. 3 No. 2 (2020): Indonesian Journal of Energy
Publisher : Purnomo Yusgiantoro Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33116/ije.v3i2.87

Abstract

The energy crisis has become a global issue that has plagued almost all parts of the world. MFCs (Microbial Fuel Cells) is an alternative technology because of its ability to convert waste into electrical energy. The bacterio-algal fuel cell (BAFCs) is kind of an effort for increasing the economic value and carbon capture capability of MFCs. In this case, algae used as a catholyte and organic substrate containing anode-reducing exoelectrogenic bacteria acted as anolyte. This research will examine the potential of algae in BAFCs as an alternative energy for Indonesia's future. By photosynthesis reaction, bacterio-algal fuel cells are operated in a self-sustaining cycle. It can be configured in single, dual chambers, and triple chambers. The performance of bacterio-algal fuel cells is strongly influenced by the bacterial and algae species in each compartment. Factors involved in bacterial-algal fuel cells are also analyzed and assessed: electrode materials, membrane, carbon sources, and algae pretreatment, including the operational parameter, such as pH and temperature. Bacterio-algal fuel cells are recommended to be used to convert algae into electricity by scaling-up and integrating the devices. Organic substrate could be obtained from municipal wastewater. Algae as by-product could be harvested and converted into certain products. Algal Fuel Cell is the solution to produce electricity and reduce CO2 pollution at the same time. Also, an algal fuel cell is potential for sustainable use in the future. By integrating the algal fuel cell in the factory that produces high-concentrated wastewater, the fuel cell can purify the wastewater so that it is safe to be drained to the environment and also can make an integrated electricity production for the whole factory. Some ways to improve the power production are proposed to improve the power generation from BAFCs since this technology offers clean, affordable, sustainable energy, and in-line with SDGs.
Co-Authors Haris Amaldi Ignatius D. M. Budi Intan Subadri M. Maulana Ibrahim Ramelan, Aditianto