Professor


 

Huan-Jang Keh Professor

葛煥彰 教授

phone:(02)3366-3048
fax:(02)23623040

email: huan

office:208

 

Lab Info

Colloid and Interface Laboratory

104A; 305

(02)3366-3015; (02)3366-3053

Education Background

B.S.Ch.E. National Taiwan University,1978
M.S.Ch.E. University of Florida, 1980
Ph.D.Ch.E.Carnegie Mellon University,1984


Research Topic

Locomotion of Colloidal Particles

Colloidal particles can be driven to move by the application of a non-uniform field (such as temperature, solute concentration, electric potential, etc.) that interacts with the interfacial region at the surface of each particle. These phenomena are known as ''phoretic motions'', which include electrophoresis of charged particles, thermocapillary motion of fluid droplets, thermophoresis of aerosol particles, and osmophoresis of semi-permeable vesicles. Theoretical studies of the particle-particle and particle-wall interactions in various phoretic motions are currently under way. Applications of this work are found in colloidal separations, processing of materials, and motility of biological cells.



 

Dynamics of Polymers at Interfaces

The adsorption of polymers to particle surfaces plays an important role in the control of the stability/flocculation behavior of colloidal suspensions. The attachment of polymers to porous membranes offers the possibility of manipulating permeability and negating adverse effects of pore-size distribution on membrane separations. Our current work includes the analysis of the motion of a particle surrounded by an adsorbed polymer layer within a small pore. The electrokinetic phenomena of a polymer-coated particle and in a pore bearing a layer of adsorbed polyelectrolytes on its inside wall are also under investigation.




Recent Research Topic

1.Thermophoretic motion of nonspherical aerosol particles (2/3) 非球形氣膠粒子之熱泳 (2/3) Huan J. Keh, sponsored by National Science Council, NSC 97-2221-E-002-075-MY3, NT$ 974,000, 8/1/2009-7/31/2011.


Honor


1.Outstanding Special-Contract Researcher Award (傑出特約研究員獎), National Science Council, ROC, 2005
 
2.Tenured Distinguished Professor (終身職特聘教授), National Taiwan University, 2006-now
 
3.Executive Committee member, Asia-Oceania Top University League on Engineering (AOTULE), 2007-now (Chairperson, 2009-2010).
 
4.Academic Award (學術獎), Ministry of Education, ROC, 2008.
 
5.Board member, Taiwan Institute of Chemical Engineers (台灣化學工程學會理事), 2008-now.
 
6.Executive Committee member, Global Engineering Deans Council (GEDC), 2009-now.
 

 
The Representative Publication Recent 5-years Publication

1. Y. W. Wan and H. J. Keh, “Slow Rotation of an Axially Symmetric Particle about Its Axis of Revolution Normal to One or Two Plane Walls”, Comp. Mod. Eng. Sci. 74, 109-137 (2011) (SCI).

2. H. J. Keh and T. F. Cheng, “Sedimentation of a Charged Particle in a Charged Cavity”, J. Chem. Phys. 135, 214706-1-10 (2011) (SCI,EI).

3. T. H. Hsieh and H. J. Keh, “Thermophoresis of an Aerosol Sphere with Chemical Reactions”, Aerosol Sci. Technol. 46, 361-368 (2012) (SCI,EI).

4. Y. C. Chang and H. J. Keh, “Creeping-Flow Rotation of a Slip Spheroid about Its Axis of Revolution”, Theor. Comp. Fluid Dyn. 26, 173-183 (2012) (SCI,EI).

5. T. C. Lee and H. J. Keh, “Creeping Motion of a Fluid Drop inside a Spherical Cavity”, Eur. J. Mech. B/Fluids 34, 97-104 (2012) (SCI,EI).

6. Y. Y. Wu and H. J. Keh, “Electrokinetic Flow and Electric Current in a Fibrous Porous Medium”, J. Phys. Chem. B 116, 3578-3586 (2012) (SCI,EI).

7. Y. C. Chang and H. J. Keh, “Effects of Thermal Stress Slip on Thermophoresis and Photophoresis”, J. Aerosol Sci. 50, 1-10 (2012) (SCI,EI).

8. T. H. Hsieh and H. J. Keh, “Motion of a Colloidal Sphere with Interfacial Self-Electrochemical Reactions Induced by a Magnetic Field”, J. Chem. Phys. 136, 174702-1-7 (2012) (SCI,EI).

9. P. Y. Huang and H. J. Keh, “Diffusiophoresis of a Spherical Soft Particle in Electrolyte Gradients”, J. Phys. Chem. B 116, 7575-7589 (2012) (SCI,EI).

10. Y. W. Wan and H. J. Keh, “Axisymmetric Diffusiophoresis of a Colloidal Particle of Revolution in Nonelectrolyte Gradients Normal to One or Two Plane Walls”, Int. J. Heat Mass Transfer 56, 138-146 (2013) (SCI,EI).

11. H. Y. Yeh and H. J. Keh, “Axisymmetric Creeping Motion of a Prolate Particle in a Cylindrical Pore”, Eur. J. Mech. B/Fluids 39, 52-58 (2013) (SCI,EI).

12. T. H. Hsieh and H. J. Keh, “Magnetohydrodynamic Motion of a Colloidal Sphere with Self-Electrochemical Surface Reactions in a Spherical Cavity”, J. Chem. Phys. 138, 074105-1-8 (2013) (SCI,EI).

13. T. C. Lee and H. J. Keh, “Axisymmetric Thermocapillary Migration of a Fluid Sphere in a Spherical Cavity”, Int. J. Heat Mass Transfer 62, 772-781 (2013) (SCI,EI).

14. T. C. Lee and H. J. Keh, “Slow Motion of a Spherical Particle in a Spherical Cavity with Slip Surfaces”, Int. J. Eng. Sci. 69, 1-15 (2013) (SCI,EI).

15. W. J. Chen and H. J. Keh, “Electrophoresis of a Charged Soft Particle in a Charged Cavity with Arbitrary Double-Layer Thickness”, J. Phys. Chem. B 117, 9757-9767 (2013) (SCI,EI).

16. Y. J. Chang and H. J. Keh, “Sedimentation of a Charged Porous Particle in a Charged Cavity”, J. Phys. Chem. B 117, 12319-12327 (2013) (SCI,EI).

17. T. C. Lee and H. J. Keh, “Thermocapillary Motion of a Spherical Drop in a Spherical Cavity”, Comp. Mod. Eng. Sci. 93, 317-333 (2013) (SCI,EI).

18. Y. S. Chiu and H. J. Keh, “Sedimentation Velocity and Potential in a Concentrated Suspension of Charged Soft Spheres”, Colloids Surfaces A 440, 185-196 (2014) (SCI,EI).

19. G. Y. Chen and H. J. Keh, “Start-Up of Electrokinetic Flow in a Fibrous Porous Medium”, J. Phys. Chem. C doi: 10.1021/jp4110568 (2014) (SCI,EI).

20. T. C. Lee and H. J. Keh, “Electrophoresis of a Spherical particle in a Spherical Cavity”, Microfluidics Nanofluidics doi: 10.1007/s10404-013-1276-8 (2014) (SCI,EI