ORCID Profile
0000-0002-6204-7520
Current Organisations
Imperial College London
,
Nanyang Technological University
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Publisher: Elsevier BV
Date: 08-2002
Publisher: IEEE
Date: 05-2006
Publisher: Wiley
Date: 06-2016
Abstract: In this work, particle lateral migration in s le-sheath flow of viscoelastic fluid and Newtonian fluid was experimentally investigated. The 4.8-μm micro-particles were dispersed in a polyethylene oxide (PEO) viscoelastic solution, and then the solution was injected into a straight rectangular channel with a deionised (DI) water Newtonian sheath flow. Micro-particles suspended in PEO solution migrated laterally to a DI water stream, but migration in the opposite direction from a DI water stream to a PEO solution stream or from one DI water stream to another DI water stream could not be achieved. The lateral migration of particles depends on the viscoelastic properties of the s le fluids. Furthermore, the effects of channel length, flow rate, and PEO concentration were studied. By using viscoelastic s le flow and Newtonian sheath flow, a selective particle lateral migration can be achieved in a simple straight channel, without any external force fields. This particle lateral migration technique could be potentially used in solution exchange fields such as automated cell staining and washing in microfluidic platforms, and holds numerous biomedical applications.
Publisher: IOP Publishing
Date: 05-12-2001
Publisher: Springer Science and Business Media LLC
Date: 24-03-2006
Publisher: Springer Science and Business Media LLC
Date: 11-08-2004
Publisher: Emerald
Date: 03-2004
DOI: 10.1108/02602280410515842
Abstract: This paper presents the development of a haptic device working with magnetorheological (MR) fluids. The computer screen is portioned in various segments and the controllable software monitors the attributed values of the voltage to the screen. The motion of a cursor on the computer screen is controlled by the MR actuator. A resistance force, the strength of which depends on the cursor position, would be generated and perceived by the user. The performance of the device is tested and verified with finite element analysis.
Publisher: Springer Science and Business Media LLC
Date: 09-2003
Publisher: American Scientific Publishers
Date: 04-2012
Abstract: Sorting of particles such as cells is a critical process for many biomedical applications, and it is challenging to integrate it into an analytical microdevice. We report an effective and flexible dielectrophoresis (DEP)-based microfluidic device for continuous sorting of multiple particles in a microchannel. The particle sorter is composed of two components-a DEP focusing unit and a Movable DEP Trap (MDT). The trap is formed by an array of microelectrodes at the bottom of the channel and a transparent electrode plate placed at the top. The location of the trap is dependent on the configuration of voltages on the array and therefore is addressable. Flowing particles are first directed and focused into a single particle stream by the focusing unit. The streamed particles are then sorted into different fractions using the movable trap by rapidly switching the applied voltage. The performance of the sorter is demonstrated by successfully sorting microparticles in a continuous flow. The proposed DEP-based microfluidic sorter can be implemented in applications such as s le preparation and cell sorting for subsequent analytical processing, where sorting of particles is needed.
Publisher: IOP Publishing
Date: 04-2002
Publisher: Springer Science and Business Media LLC
Date: 16-06-2004
Publisher: Springer Science and Business Media LLC
Date: 05-2003
Publisher: SPIE
Date: 11-2002
DOI: 10.1117/12.469066
Publisher: Elsevier BV
Date: 2003
Publisher: Elsevier BV
Date: 04-2004
Publisher: Elsevier BV
Date: 08-2004
Publisher: IOP Publishing
Date: 18-04-2001
Publisher: IOP Publishing
Date: 08-04-2005
Publisher: Elsevier BV
Date: 02-2007
Publisher: Springer Science and Business Media LLC
Date: 03-2003
Publisher: SPIE
Date: 02-07-2001
DOI: 10.1117/12.432732
Publisher: IOP Publishing
Date: 28-04-2006
Publisher: Elsevier BV
Date: 2003
Publisher: Elsevier BV
Date: 08-2017
Publisher: IOP Publishing
Date: 04-2006
Publisher: World Scientific Pub Co Pte Lt
Date: 20-12-2005
DOI: 10.1142/S0217984905010359
Abstract: This paper presents a numerical solution for the four-phase traveling dielectrophoresis (DEP) using a novel meshless method - weighted least square finite difference (LSFD) scheme. The exact boundary condition and nonuniform point distribution were used in the calculation. Numerical results including the electrical potential, electrical field, traveling DEP forces and particle behavior are presented. Although the LSFD scheme was originally proposed in solving incompressible viscous flow, it is further demonstrated in this paper that the method is also well suited for solving all kinds of DEP problems in which extremely high gradient of electric field exists in the computational domain, e.g. edges of the electrodes. The LSFD method enables the computational ease of free point/mesh distribution in these areas and hence save the computational efforts.
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Hejun Du.