http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김민준,( Srikanth Turlapati ),( Somen Debnath ),( Nandiraju V. S. Rao ),윤동기 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
To generate large optical texture, we have utilized chemically modifying substrates using self-assembled monolayers (SAM) having molecule-phobic characteristic. A droplet on the substrate treated by SAM exhibited large focal conic domains. And an in-plane electric field spread out droplet that finally changed to uniform thin film. The liquid crystalline molecules in the film exhibited uniaxial orientation in the same direction of the electric field, resulting in linearly polarized light emission due to fluorescence of the molecules. The highly aligned B7 film with large area was characterized by depolarized transmitted light microscopy (DTLM) and fluorescence polarizing microscopy (FPM). And the B7 film will provide great opto-electronic applications such as a linearly polarized light emission film and a fast light modulator.
Highly Polarized Fluorescent Illumination Using Liquid Crystal Phase
Gim, Min-Jun,Turlapati, Srikanth,Debnath, Somen,Rao, Nandiraju V. S.,Yoon, Dong Ki American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.5
<P>Liquid crystal (LC) materials are currently the dominant electronic materials in display technology because of the ease of control of molecular orientation using an electric field. However, this technology requires the fabrication of two-polarizers to create operational displays, reducing light transmission efficiency below 10%. It is therefore desirable to develop new technologies to enhance the light efficiency while maintaining or improving other properties such as the modulation speed of the molecular orientation, Here we report a uniaxial-oriented B7 smectic liquid crystalline film, using fluorescent bent-core LC molecules, a chemically modified substrate, and an in-plane electric field. A LC droplet under homeotropic boundary conditions of air/LC as well as LC/substrate exhibits large focal conic like optical textures. The in-plane electric field induced uniaxial orientation of the LC molecules) in which molecular polar directors are aligned in the direction of the electric field. This highly oriented LC film exhibits linearly polarized luminescence and microsecond time-scale modulation characteristics. The resultant device is both cheap and easy to.fabricate and thus has great potential for electro-optic applications, including LC displays, bioimaging systems, and optical communications.</P>
Ramakrishna N. Hegde,Srikanth S. Rao,R. P. Reddy 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.11
The pool boiling characteristics of dilute dispersions of CuO nanoparticles in water were studied at atmospheric pressure on a vertical heating surface. Experimental investigation of different weight concentrations of nanoparticles revealed significant enhancement in heat flux and deterioration in pool boiling. Out of many reasons, nanoparticles coating the heater surface was believed to be the reason behind this. Subsequent inspection of the heater surface showed nanoparticles coating the surface, forming a porous layer. To substantiate the nanoparticle deposition and its effect on heat flux, an investigation was performed by measuring the surface roughness of the heater surface before and after the experiment. While SEM images of the heater surface revealed nanoparticle deposition, measurement of surface roughness of the heater surface confirmed it. Formation of the porous layer on the heater surface as revealed by SEM images provided an excellent location for nucleation sites enhancing heat transfer. However, deterioration in nucleate boiling at different weight concentrations indicated some phenomenon is working behind this