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미세유체 칩 내에서 유전영동 집게(Dielectrophoretic Tweezers) 를 이용한 단백질A와 면역 글로불린 G의 결합에 관한 연구
곽태준,이재우,윤대성,이상우,Kwak, Tae Joon,Lee, Jae Woo,Yoon, Dae Sung,Lee, Sang Woo 대한의용생체공학회 2013 의공학회지 Vol.34 No.3
The 'Dielectrophoretic Tweezers(DEP Tweezers)' can be used as a facile, economical toolkit for quantitative measurement of chemical and biological binding forces related to many biological interactions within a microfluidic device. Our experimental setup can probe the interaction between a single receptor molecule and its specific ligand. Immunoglobulin G(IgG) functionalized on polystyrene microspheres has been used to detect individual surface linked Staphylococcus protein A(SpA) molecules and to characterize the strength of the noncovalent IgG-SpA bond. It was measured and compared with the existing measurements. Measured single binding force of between Goat, Rabbit IgG and SpA were $17{\pm}7pN$, $74{\pm}16pN$. This work can be used to investigate several different ligand-receptor interactions and antigen-antibody interactions.
미세유체칩내 electrode의 opening window형태에 따른 유전전기영동력 특성 규명
이재우,곽태준,윤대성,이상우,Lee, Jaewoo,Kwak, Tae Joon,Yoon, Dae Sung,Lee, Sang Woo 대한의용생체공학회 2013 의공학회지 Vol.34 No.4
Dielectrophoresis(DEP) is useful in manipulation and separation of micro-sized particles including biological samples such as bacteria, blood cells, and cancer cells in a micro-fluidic device. Especially, those separation and manipulation techniques using DEP in combination of micro fabrication technique have been researched more and more. Recently, it is revealed that a window structure of insulating layer in microfluidic DEP chip is key role in trap of micro-particles around the window structure. However, the trap phenomenon-driven by DEP force gradient did not fully understand and is still illusive. In this study, we characterize the trap mechanism and efficiency with different shapes of window in a microfluidic DEP chip. To do this characterization, we fabricated 4 different windows shapes such as rhombus, circle, squares, and hexagon inside a micro-fluidic chip, and performed micro-sized particles manipulation experiments as varying the frequency and voltage of AC signal. Moreover, the numerical simulation with the same parameters that were used in the experiment was also performed in order to compare the simulation results and the experimental results. Those comparison shows that both results are closely matched. This study may be helpful in design and development of microfluidic DEP chip for trapping micro-scaled biological particle.
NiFe/Cu/NiFe/IrMn 스핀밸브 박막소자의 자화 용이축에 따른 형상 자기이방성
최종구(Jong-Gu Choi),곽태준(Tae-Joon Kwak),이상석(Sang-Suk Lee),심정택(Jung-Taek Sim) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.2
The GMR-SV (giant magnetoresistance-spin valve) device depending on the micro patterned features according to two easy directions of longitudinal and transversal axes has been studied. The GMR-SV multilayer structure was Ta(5 ㎚)/NiFe(8 ㎚)/Cu(2.3 ㎚)/NiFe(4 ㎚)/IrMn(8 ㎚)/Ta(2.5 ㎚). The applied anisotropy direction of the GMR-SV thin film was performed under the magnitude of 300 Oe using by permanent magnet during the deposition. The size of micro patterned device was a 1 × 18 ㎛² after the photo lithography process. In the aspects of the shape magnetic anisotropy effect, there are two conditions of fabrication for GMR-SV device. Firstly, the direction of sensing current was perpendicular to the magnetic easy axis of the pinned NiFe/IrMn bilayer with the transversal direction of device. Secondly, the direction of shape magnetic anisotropy was same to the magnetic easy axis of the free NiFe layer with the longitudinal direction of device.