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Visualization and label-free quantification of microfluidic mixing using quantitative phase imaging
Park, GwangSik,Han, Dongsik,Kim, GwangSu,Shin, Seungwoo,Kim, Kyoohyun,Park, Je-Kyun,Park, YongKeun OSA OPTICAL SOCIETY OF AMERICA 2017 Applied optics Vol.56 No.22
<P>Microfluidic mixing plays a key role in various fields, including biomedicine and chemical engineering. To date, although various approaches for imaging microfluidic mixing have been proposed, they provide only quantitative imaging capability and require exogenous labeling agents. Quantitative phase imaging techniques, however, circumvent these problems and offer label-free quantitative information about concentration maps of microfluidic mixing. We present the quantitative phase imaging of microfluidic mixing in various types of polydimethylsiloxane microfluidic channels with different geometries; the feasibility of the present method was validated by comparing it with the results obtained by theoretical calculation based on Fick's law. (C) 2017 Optical Society of America</P>
Physical and Magnetic Characteristics of Carbon Nanotubes Radiated by Proton Beams
Chung-Jong Yu,Jae yong Kim,Euikwoun Kim,Kyoohyun Han,Suil Suh,Yoon man Lee 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
Single-walled carbon nanotubes were radiated by proton beams with energy of 35.7 MeV at the Bragg peaks, and magnetic force gradient images and topography were simultaneously measured by using a Nanoscope IV scanning probe microscope while changing the tip distance from the sample. The results show that the magnetic force gradient images become unclear as the scan height increases from 10 nm from the surface of the specimen and completely disappear at 50 nm. When the CNTs were radiated by proton beams, however, clear magnetic force gradient images were observed even at higher scan heights (100 nm) while very little change was noticed in the physical properties, including the tube shapes. It is interesting to note that magnetic force gradient images were not changed by reversing the magnetization of the tip, which reflects an induction of magnetism on the carbon nanotubes.