scholarly journals dc electrokinetics for spherical particles in salt-free concentrated suspensions including ion size effects

2011 ◽  
Vol 13 (43) ◽  
pp. 19437 ◽  
Author(s):  
Rafael Roa ◽  
Félix Carrique ◽  
Emilio Ruiz-Reina
Keyword(s):  
Size Effects ◽  
Spherical Particles ◽  
Concentrated Suspensions ◽  
Ion Size

scholarly journals Ion size effects on the electrokinetics of salt-free concentrated suspensions in ac fields

2012 ◽  
Vol 387 (1) ◽  
pp. 153-161 ◽  
Author(s):  
Rafael Roa ◽  
Félix Carrique ◽  
Emilio Ruiz-Reina
Keyword(s):  
Size Effects ◽  
Concentrated Suspensions ◽  
Ion Size ◽  
Ac Fields

The formation of thymidine-based T-tetramers with remarkable structural and metal ion size effects

2011 ◽  
Vol 9 (4) ◽  
pp. 1030-1033 ◽  
Author(s):  
Qun Luo ◽  
Dayong Wu ◽  
Shixiong Liu ◽  
Daihua Tang ◽  
Yong Huang ◽  
...  
Keyword(s):  
Size Effects ◽  
Metal Ion ◽  
Ion Size

Suspensions with a tunable effective viscosity: a numerical study

2012 ◽  
Vol 693 ◽  
pp. 345-366 ◽  
Author(s):  
L. Jibuti ◽  
S. Rafaï ◽  
P. Peyla
Keyword(s):  
Effective Viscosity ◽  
Volume Fraction ◽  
Numerical Study ◽  
Spherical Particles ◽  
Dimensionless Number ◽  
Particle Rotation ◽  
Concentrated Suspensions ◽  
Sheared Suspensions ◽  
Neutrally Buoyant ◽  
Universal Behaviour

AbstractIn this paper, we conduct a numerical investigation of sheared suspensions of non-colloidal spherical particles on which a torque is applied. Particles are mono-dispersed and neutrally buoyant. Since the torque modifies particle rotation, we show that it can indeed strongly change the effective viscosity of semi-dilute or even more concentrated suspensions. We perform our calculations up to a volume fraction of 28 %. And we compare our results to data obtained at 40 % by Yeo and Maxey (Phys. Rev. E, vol. 81, 2010, p. 62501) with a totally different numerical method. Depending on the torque orientation, one can increase (decrease) the rotation of the particles. This results in a strong enhancement (reduction) of the effective shear viscosity of the suspension. We construct a dimensionless number $\Theta $ which represents the average relative angular velocity of the particles divided by the vorticity of the fluid generated by the shear flow. We show that the contribution of the particles to the effective viscosity can be suppressed for a given and unique value of $\Theta $ independently of the volume fraction. In addition, we obtain a universal behaviour (i.e. independent of the volume fraction) when we plot the relative effective viscosity divided by the relative effective viscosity without torque as a function of $\Theta $. Finally, we show that a modified Faxén law can be equivalently established for large concentrations.

Ion size effects on the streaming potential of narrow charged pores

2001 ◽  
Vol 3 (12) ◽  
pp. 2493-2496 ◽  
Author(s):  
Javier Cervera ◽  
Jose´ A. Manzanares ◽  
Salvador Mafe´
Keyword(s):  
Size Effects ◽  
Streaming Potential ◽  
Ion Size
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