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Non-stokes drag coefficient in single-particle electrophoresis: New insights on a classical problem

Publication ,  Journal Article
Liao, MJ; Wei, MT; Xu, SX; Daniel Ou-Yang, H; Sheng, P
Published in: Chinese Physics B
January 1, 2019

We measured the intrinsic electrophoretic drag coefficient of a single charged particle by optically trapping the particle and applying an AC electric field, and found it to be markedly different from that of the Stokes drag. The drag coefficient, along with the measured electrical force, yield a mobility-zeta potential relation that agrees with the literature. By using the measured mobility as input, numerical calculations based on the Poisson-Nernst-Planck equations, coupled to the Navier-Stokes equation, reveal an intriguing microscopic electroosmotic flow near the particle surface, with a well-defined transition between an inner flow field and an outer flow field in the vicinity of electric double layer's outer boundary. This distinctive interface delineates the surface that gives the correct drag coefficient and the effective electric charge. The consistency between experiments and theoretical predictions provides new insights into the classic electrophoresis problem, and can shed light on new applications of electrophoresis to investigate biological nanoparticles.

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Published In

Chinese Physics B

DOI

EISSN

2058-3834

ISSN

1674-1056

Publication Date

January 1, 2019

Volume

28

Issue

8

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

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Liao, M. J., Wei, M. T., Xu, S. X., Daniel Ou-Yang, H., & Sheng, P. (2019). Non-stokes drag coefficient in single-particle electrophoresis: New insights on a classical problem. Chinese Physics B, 28(8). https://doi.org/10.1088/1674-1056/28/8/084701
Liao, M. J., M. T. Wei, S. X. Xu, H. Daniel Ou-Yang, and P. Sheng. “Non-stokes drag coefficient in single-particle electrophoresis: New insights on a classical problem.” Chinese Physics B 28, no. 8 (January 1, 2019). https://doi.org/10.1088/1674-1056/28/8/084701.
Liao MJ, Wei MT, Xu SX, Daniel Ou-Yang H, Sheng P. Non-stokes drag coefficient in single-particle electrophoresis: New insights on a classical problem. Chinese Physics B. 2019 Jan 1;28(8).
Liao, M. J., et al. “Non-stokes drag coefficient in single-particle electrophoresis: New insights on a classical problem.” Chinese Physics B, vol. 28, no. 8, Jan. 2019. Scopus, doi:10.1088/1674-1056/28/8/084701.
Liao MJ, Wei MT, Xu SX, Daniel Ou-Yang H, Sheng P. Non-stokes drag coefficient in single-particle electrophoresis: New insights on a classical problem. Chinese Physics B. 2019 Jan 1;28(8).

Published In

Chinese Physics B

DOI

EISSN

2058-3834

ISSN

1674-1056

Publication Date

January 1, 2019

Volume

28

Issue

8

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences