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NUMERICAL STUDY ON ELECTROPHORETIC MOTION OF A BIO-POLYMER THROUGH A NANO-PORE
수레수 알라파티(Suresh Alapati),서용권(Yong Kweon Suh) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
In this work, the electrophoretic motion of dsDNA molecule represented by a polymer through an artificial nano-pore in a membrane is simulated using the numerical method combining the lattice Boltzmann and Langevin molecular dynamic method. The polymer motion is represented by Langevin molecular dynamics technique while the fluid flow is taken into account by fluctuating lattice-Boltzmann method. The hydrodynamic interactions between the polymer and solvent in a confined space with a membrane having a hole are considered explicitly through the frictional and the random forces. The electric field intensity over the space is obtained from a finite difference method. Initially, the polymer is placed at one side of the space, and an electric field is applied to drive the polymer to the other side of the space through the nano-pore. In future, we plan to study the effect of the polymer size and the electric field on the electrophoretic velocity.
Suresh Alapati(수레수알라파티),Sangmo Kang(강상모),Yong Kweon Suh(서용권) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.11
Translocation of biopolymers such as DNA and RNA through a nano-pore is an important process in biotechnology applications. The translocation process of a biopolymer through an artificial nano-pore in the presence of a fluid solvent is simulated. The polymer motion is simulated by Langevin molecular dynamics (MD) techniques while the solvent dynamics are taken into account by lattice-Boltzmann method (LBM). The hydrodynamic interactions are considered explicitly by coupling the polymer and solvent through the frictional and the random forces. From simulation results we found that the hydrodynamic interactions between polymer and solvent speed-up the translocation process. The translocation time τ<SUB>T</SUB> scales with the chain length N as τ<SUB>T</SUB><SUP>∝</SUP> N<SUP>α</SUP>. The value oj scaling exponents(α) obtained from our simulations are 1.29 ± 0.03 and 1.41 ± 0.03, with and without hydrodynamic interactions, respectively. Our simulation results are in good agreement with the experimentally observed value of α, which is equal to 1.27 ± 0.03, particularly when hydrodynamic interaction effects are taken into account.
Mixing in a Microchannel by using Induced-charge Electro-osmosis
전영훈(Young Hun Jeon),허영근(Young Gun Heo),정원혁(Won Hyuk Jung),수레수 알라파티(Suresh Alapati),서용권(Yong Kweon Suh) 한국가시화정보학회 2010 한국가시화정보학회지 Vol.8 No.4
This paper presents an experimental study on the performance of a micro-mixer using AC electro-osmotic flow. The microchannel is made of PDMS for the side and top walls and glass patterned with ITO for the bottom wall. We first investigated the effect of the applied potential as well as the frequency on the slip velocity. We have found that the slip velocity is roughly proportional to the applied voltage in line with the Helmholtz-Smoluchowski equation and there is an optimum frequency at which the slip velocity becomes maximized. To find the optimum parameters for mixing device we tested our device for various design parameters. It turned out that the best mixing effect is obtained approximately when the electrode angle is 30°, electrode width 200 ㎛, and the frequency of power supply 700 ㎐.