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Dynamic Transport Control of Colloidal Particles by Repeatable Active Switching of Solute Gradients
Ha, Dogyeong,Seo, Sangjin,Lee, Kyunghun,Kim, Taesung American Chemical Society 2019 ACS NANO Vol.13 No.11
<P>Diffusiophoresis (DP) is described as typically being divided into chemiphoresis (CP) and electrophoresis (EP), and the related theory is well-established. However, not only the individual effect of CP and EP but also the size dependency on the resulting DP of colloidal particles has not yet been comprehensively demonstrated in an experimental manner. In this paper, we present a dynamic transport control mechanism for colloidal particles by developing a micro-/nanofluidic DP platform (MNDP). We demonstrate that the MNDP can generate transient and/or steady-state concentration gradients, making it possible to control the direction and rate of transport of colloidal particles through the individual manipulation of CP and EP by simply and rapidly switching solutions. In addition, the MNDP allows the size-dependent separation as well as fractionation of submicron particles through the individual manipulation of CP and EP, thus empirically validating the classic theoretical model for DP under the influence of electrical double layer (EDL) thickness. Furthermore, we provide theoretical analysis and simulation results that will enable the development of a versatile separation and/or fractionation technique for various colloidal particles, including biosamples, according to their size or electrical feature.</P> [FIG OMISSION]</BR>
배기 덕트 구조에 따른 압력 변화 예측 3D 프로그램 개발
하수현(Soohyun Ha),김영석(Youngseok Kim),정승연(Seungyoun Jung),김태성(Taesung Kim) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
This paper was performed to update previous 2-D pressure drop prediction program to 3-D program. In this program, t-method which is suitable to apply to optimization of duct design was used to predict a proper flow distribution in duct system. Pressure drop is calculated by Darcy-Weisbach equation and extra pressure loss is calculated with reference to the Blevins, Fried, Idelchick and Miller handbook. 3-D program is made by visual studio based on MFC. This program contains rotation, zoom-in and zoom-out functions so legibility of this program is increased.
하수현(Soohyun Ha),강동원(Dongwon Kang),김태성(Taesung Kim) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
This paper was performed to develope a prediction program for pressure drop which depends on the structure of exhaust duct. In this program, t-method which is suitable to apply to optimization of duct design was used to predict a proper flow distribution in duct system. The reliability of this program was verified through the calculation of variables in the real duct system. Pressure drop in two existing duct system was calculated by using this program and compared with experimental measurement. The calculation results are 15.8 mmAq in case 1 and 10.4 mmAq in case 2. The experimental result is 15.29 mmAq in case 1 and 10.59 mmAq in case 2. Calculation results and experimental results ware matched with relatively high accuracy with under 5% error.