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Electrowetting-on-Dielectric Device Controlled by Embedded Undulating Electrode for Liquid Transport
Lee, Sin-Hyung,Lee, In-Ho,Kim, Jiyoon,Keum, Chang-Min,Yu, Eui-Sang,Lee, Sin-Doo American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.6
<P>We demonstrated a new architecture of an electrowetting-on-dielectric (EWOD) device to transport a liquid droplet by the spatial modulation of an electric field produced using an embedded undulating electrode. The undulating electrode was constructed on an array of dielectric microstructures with different periods in region by region to generate a gradually varying lateral electric field. The contact angle of a droplet of water on the EWOD surface was found to decrease monotonically from 120 degrees to about 50 degrees with increasing the strength of the electric field. The transport of the water droplet was driven by the surface wettability gradient produced by means of the amplitude modulation of the electric field in space but not in time. Our EWOD configuration allows the flexibility in design, the simplicity in driving scheme, and the high accuracy in position for the liquid transport.</P>
Lee, Sin-Hyung,Park, Hea-Lim,Kim, Min-Hoi,Kang, Sujie,Lee, Sin-Doo American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.33
<P>We demonstrate the physical pictures of the localization of the conductive filaments (CFs) growth in flexible electrochemical metallization (ECM) memristors through an interfacial triggering (IT) into the polymer electrolyte. The IT sites (ITSs), capable of controlling the pathways of the CF growth, are formed at the electrode-polymer interfaces via the Ostwald ripening at low temperatures (below 230 °C). The injection and migration of metal ions and the resultant CF growth are found to be effectively controlled through the ITSs with the local electric field enhancement. The reliability, uniformity, and switching voltage of the device are much improved by the presence of the ITSs. Our flexible ECM memristor exhibits a high mechanical flexibility and a stable memory performance under repeated bending deformations.</P> [FIG OMISSION]</BR>
Combinatorial color arrays based on optical micro-resonators in monolithic architecture.
Lee, In-Ho,Lee, Sin-Hyung,Keum, Chang-Min,Kim, Se-Um,Lee, Sin-Doo Optical Society of America 2014 Optics express Vol.22 No.12
<P>We demonstrate two types of combinatorial color arrays based on the Fabry-Perot (FP) micro-resonators in monolithic architecture. Optical micro-resonators corresponding to color elements are constructed using a soluble dielectric material between two transreflective layers by transfer-printing in either a pattern-by-pattern or a pattern-on-pattern fashion. The color palette depends primarily on the thickness and the refractive index of a dielectric material embedded in the micro-resonator. A self-defined lateral gap between two adjacent color elements provides the functionality of light-blocking by the underlying background layer. A prototype of a liquid crystal display incorporated with our combinatorial color array is also demonstrated. This monolithic integration of different FP micro-resonators leads to a versatile platform to build up a new class of color arrays for a variety of visual applications including displays and coloration devices.</P>
Lee, Sang-Wook,Noh, Ji-Yoon,Park, Seung Chul,Chung, Jin-Ho,Lee, Byoungho,Lee, Sin-Doo American Chemical Society 2012 Langmuir Vol.28 No.20
<P>We develop a biomimetic cell-on-membrane architecture in close-volume format which allows the interfacial biocompatibility and the reagent delivery capability for on-chip bioassays. The key concept lies in the microfluidic engraving of lipid membranes together with biological cells on a supported substrate with topographic patterns. The simultaneous engraving process of a different class of fluids is promoted by the front propagation of an air–water interface inside a flow-cell. This highly parallel, microfluidic cell-on-membrane approach opens a door to the natural biocompatibility in mimicking cellular stimuli-response behavior essential for diverse on-chip bioassays that can be precisely controlled in the spatial and temporal manner.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2012/langd5.2012.28.issue-20/la3010695/production/images/medium/la-2012-010695_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la3010695'>ACS Electronic Supporting Info</A></P>
Wide-Viewing Display Configuration of Heilix-Deformed Ferroelectric Liquid Crystals
Lee, Ju-Hyun,You, Doo-Hwan,Park, Jae-Hong,Lee, Sin-Doo,Yu, Chang-Jae The Korean Infomation Display Society 2000 Journal of information display Vol.1 No.1
We propose on a novel vertical configuration (VC) for a helix-deformed ferroelectric liquid crystal (HDFLC) display that has fast response, high contrast, analog gray scale capability, and wide-viewing characteristics. In contrast to a conventional HDFLC in a planar geometry, smectic layers arrange themselves parallel to the substrates, and thus, extremely uniform alignment of molecules in large area is naturally achieved in our new configuration without additional processes such as the rubbing and/or electric field treatment. Moreover, with a proper design of electrode patterns on the same substrate, multidomain switching is easily realized without employing any complex process of alignment. Our new VC-HDFLC is expected to provide a viable technology to produce a next-generation large area LCD suitable for processing the dynamic image at a video-rate.
Lee, Sang-Wook,Park, Seung Chul,Lim, Yongjun,Lee, Byoungho,Lee, Sin-Doo WILEY-VCH Verlag 2010 ADVANCED MATERIALS Vol.22 No.37
<B>Graphic Abstract</B> <P>Quasi-periodic colloidal networks are constructed on the basis of polymorphic meniscus convergence (MC) in an air-cavity-embedded, nano-colloidal system. Depending on the flow associated with the air-cavities, the colloidal particles are self-organized into nanowires through binary MC, Y-junctions through ternary MC, and X-junctions through quaternary MC. The colloidal networks in either square or hexagonal form reflect the flow symmetry according to the air-cavity deformation. <img src='wiley_img_2010/09359648-2010-22-37-ADMA201001336-content.gif' alt='wiley_img_2010/09359648-2010-22-37-ADMA201001336-content'> </P>