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Duy-Nam Phan,Rina Afiani Rebia,Yusuke Saito,Davood Kharaghani,Muzamil Khatri,Toshihisa Tanaka,Hoik Lee,Ick Soo Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.85 No.-
The synthesis of composite nanofibers comprised of polyacrylonitrile (PAN), zinc oxide, and hinokitiol(HT) was introduced for bactericidal exertion and dye removal. The ZnO-HT-PAN_H showed better dye-removing or antibacterial results in comparison with using either zinc oxide or HT embedded in PANnanofibers. The resulted PAN nanofibers containing mere ZnO were proved to be holding nanoparticlesloosely, which was undesirable for dye removal on account of the irretrievable distribution of particlesinto the liquid environment. With the gluing effect of HT, ZnO nanoparticles were bound together andthus the dye adsorption was improved. In the present study, all samples were characterized by SEM-EDS,TEM, FTIR, XRD, XPS, tensile testing, and water contact angle. The antibacterial properties were assessedagainst Escherichia coli and Staphylococcus aureus, presenting superior inhibition zones, revealing thesynergistic actions of HT and zinc oxide. The dye removing effects, evaluated against reactive blue 19 andreactive red 195 throughout 26 h, also exhibited improved adsorption without leaching phenomena. Themaximum adsorption capacity of ZnO-HT-PAN_H was 267.37 and 245.76 mg/g for RB 19 and RR 195,respectively. The composite nanofibers with antibacterial properties and dye adsorption capacity alsoshowed excellent self-cleaning performance under UV radiation.
A Concurrent Triple-band RF Energy Harvesting Circuit for IoT Sensor Networks
Luong Duy Manh,Phan Thi Bich,Nguyen Thuy Linh,Nguyen Huy Hoang,Tran Xuan Nam,Koichiro Ishibashi 대한전자공학회 2021 IEIE Transactions on Smart Processing & Computing Vol.10 No.2
In this paper, a concurrent triple-band RF energy harvesting circuit is proposed. The proposed circuit incorporates a triple-band microstrip antenna combining a low-loss diplexer and three compact RF rectifiers. The proposed circuit operates concurrently at three popular frequency bands: GSM-900, GSM-1800, and 2.45 GHz. To improve output voltage and efficiency, three rectifiers are connected in a stacked topology. The simulated and measured results demonstrate that the circuit operates well in concurrent bands. Moreover, the proposed circuit exhibits a low-complexity structure and compactness in size. These advantages make the circuit a strong potential candidate for running low-power devices in IoT sensor networks.
Azeem Ullah,Sana Ullah,Tanzeel Areeb,Muhammad Umar,Phan Duy Nam,Rashid Masood,Soonjee Park,김익수 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11
Polysaccharides from different sources have found their applications in the wound care for their inherent abilitiesof gelling, biocompatibility, biodegradability, and antibacterial activity. Considering the low cost, ease of processing,abundance in nature and therapeutic benefits of the polysaccharides we developed psyllium, alginate and chitosan (PAC)composite fibers and modelled their physical properties namely; tenacity, linear density and absorption in both distilled waterand saline solution; using Box-Behnken (BB) technique of Response Surface Methodology (RSM). The PAC fibers wereproduced using an in house developed wet spinning module; briefly the dope solutions containing psyllium and alginate wereextruded into a hydrolyzed chitosan and CaCl2. The produced fibers were acetone washed to remove the polar solvent; in thiscase water; and later dried in air. The present work aimed at the development of statistical models for physical properties:linear density, tenacity, antibacterial efficacy and liquid absorption; of the composite PAC fibers. The factors underconsideration were the raw material concentration namely; alginate and psyllium in dope solution and calcium chloride(CaCl2) and hydrolysed chitosan in the coagulation bath. The experimental work was designed and analyzed using Minitab®17 statistical software. Regression models using the under consideration factors were successfully developed.