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RISS 인기검색어
- 검색키워드
- 저자 : Lily Nari Kim (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Kim, Lily Nari,Kim, Eun-Geun,Kim, Junhoi,Choi, Sung-Eun,Park, Wook,Kwon, Sunghoon Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
We have developed magnetically controllable gold nanoparticles by synthesizing superparamagnetic $Fe_3O_4$ core/gold shell nanoparticles. The core/shell particles have the capability of forming gold 1D chains in the presence of an external magnetic field. Here we demonstrate dynamic and reversible self-assembly of the gold 1D chain structures in an aqueous solution without any templates or physical or chemical attachment. The spatial configuration of gold chains can be arbitrarily manipulated by controlling the direction of a magnetic field. This technique can provide arbitrary manipulation of gold 1D chains for fabrication purpose. To demonstrate this capability, we present a technique for immobilization of the gold particle chains on a glass substrate.
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Single exposure fabrication and manipulation of 3D hydrogel cell microcarriers
Kim, Lily Nari,Choi, Sung-Eun,Kim, Junhoi,Kim, Hyoki,Kwon, Sunghoon Royal Society of Chemistry 2011 Lab on a chip Vol.11 No.1
<P>We present a simple and high-throughput method for fabricating free-floating hydrogel cell microcarriers using single exposure UV patterning. We also demonstrate magnetic manipulation of the free-floating cell microcarriers using a magnetic nanoparticle-embedded structure for an active agitation and a solution exchange.</P> <P>Graphic Abstract</P><P>We present a simple and high-throughput method for fabricating free-floating hydrogel cell microcarriers using single exposure UV patterning. We also demonstrate magnetic manipulation of the cell microcarriers using a magnetic nanoparticle-embedded structure for an active agitation and a solution exchange. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0lc00369g'> </P>
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Lily Nari Kim,Eun-Geun Kim,김준회,Sung-Eun Choi,박욱,권성훈 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
We have developed magnetically controllable gold nanoparticles by synthesizing superparamagnetic Fe3O4 core/gold shell nanoparticles. The core/shell particles have the capability of forming gold 1D chains in the presence of an external magnetic field. Here we demonstrate dynamic and reversible self-assembly of the gold 1D chain structures in an aqueous solution without any templates or physical or chemical attachment. The spatial configuration of gold chains can be arbitrarily manipulated by controlling the direction of a magnetic field. This technique can provide arbitrary manipulation of gold 1D chains for fabrication purpose. To demonstrate this capability, we present a technique for immobilization of the gold particle chains on a glass substrate.
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In Situ Fabrication and Actuation of Polymer Magnetic Microstructures
Su Eun Chung,Jiyun Kim,Sung-Eun Choi,Kim, Lily Nari,Sunghoon Kwon IEEE 2011 Journal of microelectromechanical systems Vol.20 No.4
<P>We demonstrate a single-exposure in situ magnetic actuator fabrication technique using magnetic nanoparticles (MNs) containing UV curable polymer in a Polydimethylsiloxane (PDMS) channel. Microstructures with a 3-D anchored cantilever as well as free-floating components are fabricated in a single step at a single site without the use of a sacrificial layer. By controlling the location of high oxygen concentration area through PDMS substrate patterning, we can create partially bound and free-floating movement-restricted structures. This allows us to create complex magnetic actuators, such as a 3-D anchored cantilever, motor type, and rail-guided magnetic actuators. The actuating performance of UV photopatterned magnetic microstructures depends on the MN concentration in photopolymer resin and magnetic field intensity. The measured translational velocity of magnetic microactuators with a 1 : 10 MN concentration is 140 μm/s under 1400 G of magnetic field in poly(ethylene glycol) diacrylate resin. Also, we demonstrate selective magnetic actuation of heterogeneous structures composed of magnetic and nonmagnetic parts self-assembled in railed microfluidic channels. Only magnetic parts from the assembly selectively actuated due to the magnetic field without response to the flow. Therefore, we have developed a versatile magnetic microstructure fabrication method that is very simple and fast, enabling rapid in situ fabrication and actuation.</P>
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