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- 저자 : R. Asmatulu (검색결과 2 건)
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Faisal M. S. S.,Abedin F.,Asmatulu R. 한국탄소학회 2020 Carbon Letters Vol.30 No.5
The energy demands of the world have been accelerating drastically because of the technological development, population growth and changing in living conditions for a couple of decades. A number of diferent techniques, such as batteries and capacitors, were developed in the past to meet the demands, but the gap, especially in energy storage, has been increasing substantially. Among the other energy storage devices, supercapacitors have been advancing rapidly to fll the gap between conventional capacitors and rechargeable batteries. In this study, natural resources such as pistachio and acorn shells were used to produce the activated carbons for electrode applications in a supercapacitor (or an electrical double-layer capaci�tor—EDLC). The activated carbon was synthesized at two diferent temperatures of 700 °C and 900 °C to study its efect on porosity and performance in the supercapacitor. The morphology of the activated carbon was studied using scanning electron microscopy (SEM). A solution of tetraethylammonium tetrafuoroborate (TEABF4)/propylene carbonate (PC) was prepared to utilize in supercapacitor manufacturing. The performance of the EDLC was investigated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy. Activated carbons from both the pistachio and acorn shells synthesized at 700 °C in argon gas for two hours exhibited better surface textures and porosity. There activated carbons also exhibited more capacitor-like behavior and lower real impedances, indicating that they would have superior performance compared to the activated carbons obtained at 900 °C. This study may be used to integrate some of natural resources into high-tech energy storage applications for sustainable developments.
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Electrospun Nanofibers: Preparation, Characterization and Atmospheric Fog Capturing Capabilities
M. A. Alamir,I. M. Alarifi,W. A. Khan,W. S. Khan,R. Asmatulu 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10
This study was aimed at enhancing the capability of electrospun nanofiber mats to convert atmospheric fog intofresh water effectively. The demand for clean water has been increasing worldwide, and this problem can be addressedeconomically by utilizing new technologies. It is known that atmospheric fresh water found on the earth is about 0.03 % ofthe total global fresh water, which is more than enough to meet the demand for fresh water in many locations. Althoughdesalination may produce a significant quantity of fresh water, it is a fairly costly, energy-intensive, and time-consumingprocess. In this research, the electrospinning method was used to fabricate superhydrophilic polyacrylonitrile (PAN) andpolyvinyl chloride (PVC) nanofiber mats incorporated with hydrophilic polymers of polyvinylpyrrolidone (PVP),polyethylene glycol (PEG), and chitosan at various direct current (DC) voltages, pump speeds, and tip-to-collector distances,in order to evaluate their capability of capturing fresh water from atmospheric fog. Fourier transform infrared (FTIR) andRaman spectroscopy were used to characterize the chemical structures of the nanofibers, while scanning electron microscopy(SEM) and water contact angle measurement methods were used to determine the morphology and surface hydrophobicity,respectively, of the produced nanofibers. At higher concentrations of PVP, PEG, and chitosan (e.g., 16 and 32 wt%), most ofthe electrospun nanofibers were superhydrophilic, with water contact angle values less than 5 o in 0.5 seconds. Humidifierand humidity test chamber results indicated that superhydrophilic nanofibers could absorb up to 69 % of their weight in ashorter period of time. This scalable process can be extended to capturing a larger quantity of fresh water from theatmosphere.
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