This title appears in the Scientific Report :
2007
Please use the identifier:
http://dx.doi.org/10.1063/1.2737446 in citations.
Please use the identifier: http://hdl.handle.net/2128/19090 in citations.
Diffusion of spheres in isotropic and nematic networks of rods: Electrostatic interactions and hydrodynamic screening
Diffusion of spheres in isotropic and nematic networks of rods: Electrostatic interactions and hydrodynamic screening
Translational diffusion of a small charged tracer sphere in isotropic and nematic suspensions of long and thin charged rods is investigated as a function of ionic strength and rod concentration. A theory for the diffusive properties of a small sphere is developed, where both (screened) hydrodynamic...
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Personal Name(s): | Kang, K. |
---|---|
Wilk, A. / Patkowski, A. / Dhont, J. K. G. | |
Contributing Institute: |
Weiche Materie; IFF-7 |
Published in: | The @journal of chemical physics, 126 (2007) S. 214501 |
Imprint: |
Melville, NY
American Institute of Physics
2007
|
Physical Description: |
214501 |
DOI: |
10.1063/1.2737446 |
PubMed ID: |
17567202 |
Document Type: |
Journal Article |
Research Program: |
Kondensierte Materie |
Series Title: |
Journal of Chemical Physics
126 |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/19090 in citations.
Translational diffusion of a small charged tracer sphere in isotropic and nematic suspensions of long and thin charged rods is investigated as a function of ionic strength and rod concentration. A theory for the diffusive properties of a small sphere is developed, where both (screened) hydrodynamic interactions and charge interactions between the tracer sphere and the rod network are analyzed. Hydrodynamic interactions are formulated in terms of the hydrodynamic screening length. As yet, there are no independent theoretical predictions for the hydrodynamic screening length for rod networks. Experimental tracer-diffusion data are presented for various ionic strengths as a function of the rod concentration, both in the isotropic and nematic states. Orientational order parameters are measured for the same ionic strengths as a function of the rod concentration. The hydrodynamic screening length is determined from these experimental data and scaling relations obtained from the above mentioned theory. For the isotropic networks, a master curve is found for the hydrodynamic screening length as a function of the rod concentration. For the nematic networks the screening length turns out to be a very sensitive function of the orientational order parameter. |