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- 저자 : Ench, R. Michael (검색결과 5 건)
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Fabrication of highly efficient coatable polarizer from tolane-based smectic reactive mesogen
He, Rui,Oh, Enche,Ye, Yang,Wen, Pushan,Jeong, Kwang-Un,Lee, Seung Hee,Li, Xiang-Dan,Lee, Myong-Hoon Elsevier 2019 Polymer Vol.176 No.-
<P><B>Abstract</B></P> <P>This work is aimed to fabricate ultra-thin coatable polarizers on a single substrate based on “host-guest” effect between highly ordered smectic reactive mesogen (RM) and dichroic dye. We designed and synthesized a new tolane-based RM with a highly ordered smectic A phase at room temperature. Polymerizable “host-guest” mixture was formulated from the host RM, dichroic dye and additives, then spin-coated on a single substrate having an alignment layer. Subsequent in-situ photopolymerization by UV irradiation successfully resulted in a coatable polarizer with good polarizing properties. The fabricated coatable polarizer showed a dichroic ratio (DR) of 16.4 and a degree of polarization (DOP) of 99.3% with the thickness of 4 μm. The resulting coatable polarizer possessed a considerable solvent resistance, good thermal stability and robust mechanical properties. Moreover, we prepared a TN-mode LC cell by using the prepared coatable polarizers inside the cell (in-cell), in which the coatable polarizers acted as a polarizer and an alignment layer, simultaneously. The resulting TN cell with in-cell polarizers exhibited a decent electro-optical behavior. We believe that the coatable polarizer proposed in this study possesses practical application potential in ultra-thin LCDs or flexible OLEDs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Reactive mesogen with smectic A phase was synthesized for coatable polarizer. </LI> <LI> Coatable polarizer was fabricated on a single substrate by “host-guest” method. </LI> <LI> Coatable polarizer exhibits considerable optical property and excellent stability. </LI> <LI> LCD with in-cell structure was demonstrated by using the prepared coatable polarizer. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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황순욱,최경호,박용헌,R.Michael Ench,Alex M.Bates,이상철,권오성,이동하 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.3
Proton Exchange Membrane Fuel Cells (PEMFC) are the most appropriate for energy source of small robot applications. PEMFC has superior in power density and thermodynamic efficiency as compared with the Direct Methaol Fuel Cell (DMFC). Furthermore, PEMFC has lighter weight and smaller size than DMFC which are very important factors as small robot power system. The most significant factor of mobile robots is weight which relates closely with energy consumption and robot operation. This research tried to find optimum specifications in terms of type, number of cell, active area, cooling method, weight, and size. In order to find optimum 500W PEMFC, six options are designed in this paper and studied to reduce total stack weight by applying new materials and design innovations. However, still remaining problems are thermal management, robot space for energy sources, and so on. For a thermal management, design options need to analysis of Computational Fluid Dynamics (CFD) for determining which option has the improved performance and durability.
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Daniel Chin Hao Koo,Nee Nee Tan,Qi Hwa Ng,Siti Kartini Enche Ab Rahim,Siew Chun Low,Ryan Yow Zhong Yeo 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.4
The high photocatalytic activity of environmentally benign Keggin-type polyoxometalate (POM) was introducedinto polyethersulfone (PES) membrane to promote membrane anti-fouling and self-cleaning functionality. NeatPES and POM/PES hybrid membranes were synthesized via phase inversion method. X-ray diffraction (XRD) andattenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy proved the success of synthesizingKeggin-type POM. The traits of the membranes were evaluated using scanning electron microscopy (SEM), ATRFTIR,contact angle measurement, porosity and porometer. The hydrophilicity of all the POM/PES hybrid membraneswas enhanced and resulted in the reduction of contact angle of the membrane (52.21±0.1101o, 45.11±0.6657o and50.30±0.1054o) for 0.025, 0.05 and 0.1wt% POM/PES hybrid membranes, respectively, compared to that of the neatPES membrane (57.30±0.0817o). Additionally, all the POM/PES hybrid membranes showed excellent anti-fouling andself-cleaning characteristics as compared to that of the neat PES membrane. 0.05 wt% POM/PES hybrid membraneoutstood all the other membranes, which marks the HA rejection at 77.12% and was able to achieve flux recovery ratio(FRR) of 111.34% with temporal superhydrophilicity effect in just merely 150 seconds at 254 nm UV irradiation.
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황순욱(S. W. Hwang),최경호(G. H. Choi),박용헌(Sam. Park),R. Michael Ench,Alex M. Bate,이상철(S. C. Lee),권오성(O. S. Kwon),이동하(D. H. Lee) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
Proton Exchange Membrane Fuel Cells (PEMFC) are the most appropriate for energy source of small robot applications. PEMFC has superior in power density and thermodynamic efficiency as compared with the Direct Methaol Fuel Cell (DMFC). Furthermore, PEMFC has lighter weight and smaller size than DMFC which are very important factors as small robot power system. The most significant factor of mobile robots is weight which relates closely with energy consumption and robot operation. This research tried to find optimum specifications in terms of type, number of cell, active area, cooling method, weight, and size. In order to find optimum 500W PEMFC, six options are designed in this paper and studied to reduce total stack weight by applying new materials and design innovations. However, still remaining problems are thermal management, robot space for energy sources, and so on. For a thermal management, design options need to analysis of Computational Fluid Dynamics (CFD) for determining which option has the improved performance and durability.
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황순욱,최경호,박용헌,이상철,권오성,이동하,Hwang, S.W.,Choi, G.H.,Park, Sam.,Ench, R. Michael,Bates, Alex M.,Lee, S.C.,Kwon, O.S.,Lee, D.H. 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.suppl3
Proton Exchange Membrane Fuel Cells (PEMFC) are the most appropriate for energy source of small robot applications. PEMFC has superior in power density and thermodynamic efficiency as compared with the Direct Methaol Fuel Cell (DMFC). Furthermore, PEMFC has lighter weight and smaller size than DMFC which are very important factors as small robot power system. The most significant factor of mobile robots is weight which relates closely with energy consumption and robot operation. This research tried to find optimum specifications in terms of type, number of cell, active area, cooling method, weight, and size. In order to find optimum 500W PEMFC, six options are designed in this paper and studied to reduce total stack weight by applying new materials and design innovations. However, still remaining problems are thermal management, robot space for energy sources, and soon. For a thermal management, design options need to analysis of Computational Fluid Dynamics (CFD) for determining which option has the improved performance and durability.
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