Welcome to BiNEL - The Kwon Research Group @ SNU
Welcome to Biophotonics and Nano Enigneering Laboratory at Seoul National University. BINEL is established in August 2006 to deliver various technological innovations through multidiciplinary research in photonics and bio/micro/nanotechnology. With firm base on photonics and micro/nanofabrication, our research interest spans in a wide range of topics such as nanobiotechnology, BioMems, micro total analysis systems and microfluidics.
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We are recruiting undergraduate students who are interested in structural color display using Biomemtic and self-assembly.
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Programmable magnetic microacturator on Nature Materials, 2011. 10 [read]
Polymeric microcomponents are widely used in microelectromechanical systems (MEMS) and lab-on-a-chip devices, but they suffer from the lack of complex motion, effective addressability and precise shape control1,2. To address these needs, we fabricated polymeric nanocomposite microactuators driven by programmable heterogeneous magnetic anisotropy. Spatially modulated photopatterning3 was applied in a shapeindependent manner to microactuator components by successive confinement of self-assembled magnetic nanoparticles in a fixed polymer matrix. By freely programming the rotational axis of each component, we demonstrate that the polymeric microactuators can undergo predesigned, complex two- and three-dimensional motion
Inside Cover articles on small, 2011. 8 [read]
In this communication, we report an optofl uidic synthesis method for generating magnetochromatic microspheres with dynamically controlled size and color. By combining microfluidic droplet generation with magnetic self-assembly and photopolymerization, we synthesize monodisperse magnetochromatic microspheres having a tailored size and photonic stop-band. By virtue of real-time amplitude modulation of the external magnetic fi eld, we can actively control the nanoscale interparticle spacing of the superparamagnetic CNCs within individual magnetochromatic microspheres during the polymerization. Active in situ control of the interparticle spacing allows for heterogeneous color distribution in a single synthesis environment without a loss of throughput. To our knowledge, this is the fi rst microsphere synthesis approach to yield heterogeneous chromatic microspheres in a onestep process that allows for real-time color variation during fabrication. Furthermore, we demonstrate the generation of structural color pattern using patterned magnets. Reversible structural color tuning techniques utilizing superparamagnetic CNCs have recently been demonstrated, but no method has both instantaneous color tuning and reversible patterning capabilities. Our structural color patterning process using magnetochromatic microspheres and patterned magnets is simple, fast, and reversible, making inexpensive structural color patterning applications feasible
Cover page on Nature Materials 2010. 8 [read]
News&Views in Nature Materials 2010. 8 [read]
Structural Color Printing on Nature Photonics 2009. 9 [read]
Many creatures in nature, such as butterflies and peacocks, display unique brilliant colours, known as ‘structural colours’, which result from the interaction of light with periodic nanostructures on their surfaces. Mimicking such nanostructures found in nature, however, requires state-of-the-art nanofabrication techniques that are slow, expensive and not scalable. In this article, we demonstrate high-resolution patterning of multiple structural colours within seconds, based on successive tuning and fixing of colour using a single material along with a maskless lithography system. We have invented a material called ‘M-Ink’, the colour of which is tunable by magnetically changing the periodicity of the nanostructure and fixable by photochemically immobilizing those structures in a polymer network. We also demonstrate a flexible photonic crystal for the realization of structural colour printing. The simple, controllable and scalable structural colour printing scheme presented may have a significant impact on colour production for general consumer goods.
Inside Cover and Hot articles on Lab on a Chip 2009. 7 [read]
We demonstrate the microfluidic sorting of directionally oriented (anisotropic) microstructures by their orientational state in solution using the concept of railed microfluidics. After being injected into a microfluidic channel, the microstructures rotate and flip in various directions. In order to sort microstructures in an organized way, we designed the microstructures and the microchannel to allow for orientation-based control of microstructure movement. In order to sort microstructures based on their rotation, we used a wedge shaped fin on the microstructures and a Y-shaped railed microfluidic channel. For sorting flipped particles, we use a double-railed microfluidic channel that has grooves on both its top and bottom surfaces. By integrating the two sorting methods we demonstrated high throughput, autonomous sorting into four different orientational states: unrotated–unflipped, rotated–unflipped, unrotated–flipped, and rotated–flipped. Here we not only demonstrate orientational assembly of directionally dependent microstructures, but also present design considerations for future work
Front Cover and Hot articles on Lab on a Chip 2009. 6 [read]
3D fabrication of hybrid microstructures is demonstrated using optofluidic maskless lithography and a membrane-controlled height-tunable microfluidic channel. The method allows for high-throughput synthesis of hybrid 3D microstructures and in situ biomaterial patterning.
Cover page on Nature Materials 2008. 7 [read]
Research Highlights in Nature 2008. 6. 26 [read]
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