Electrostatic interactions in concentrated colloidal dispersions

2017 ◽  
Vol 19 (35) ◽  
pp. 23849-23853 ◽  
Author(s):  
Håkan Wennerström
Keyword(s):  
Explicit Expression ◽  
Electrostatic Interactions ◽  
Pair Interaction ◽  
Colloidal Dispersions ◽  
High Concentration ◽  
Colloidal Spheres ◽  
Effective Pair

An explicit expression, free from adjustable parameters, is derived for the effective pair interaction between charged colloidal spheres at high concentration in a medium containing an electrolyte.

Order and Disorder in Ni-Pt Single Crystals

2011 ◽  
Vol 172-174 ◽  
pp. 593-601 ◽  
Author(s):  
Bernd Schönfeld ◽  
Markus Engelke ◽  
Andrei V. Ruban
Keyword(s):  
Monte Carlo ◽  
Single Crystals ◽  
Nearest Neighbor ◽  
Intermetallic Phase ◽  
Pair Interaction ◽  
Range Order ◽  
Large Contribution ◽  
Local Maxima ◽  
Order And Disorder ◽  
Effective Pair

Single crystals of Ni-25.6 at.% Pt and Ni-87.8 at.% Pt were investigated by diffuse x-ray scattering for states of thermal equilibrium (923 K and 603 K, respectively). The separated short-range order scattering showed local maxima at 100 positions. Effective pair interaction parameters, as determined by the inverse Monte Carlo method, show a strong composition dependence of the nearest-neighbor interaction parameter. First-principles calculations are consistent with this finding and reveal a large contribution due to lattice strain. Based on values of the ordering energy, NiPt3with L12structure was considered as a plausible new intermetallic phase, with Monte Carlo simulations giving an order-disorder transition temperature of 650 K. A single crystal of Ni-75.2 at.% Pt, quenched from 1073 K and aged at 613 K, showed L12-type ordering, reaching a long-range order parameter of 0.50(4) after 800 h.

Ordering energy and effective pair interaction in ordering alloys of noble metals

1974 ◽  
Vol 17 (6) ◽  
pp. 772-774
Author(s):  
V. M. Dement'ev ◽  
�. V. Kozlov
Keyword(s):  
Noble Metals ◽  
Pair Interaction ◽  
Effective Pair

Diffusion of Colloidal Spheres in Rod-Networks: Hydrodynamic Screening and Electrostatic Interactions

2008 ◽  
Author(s):  
Kyongok Kang ◽  
Jan K. G. Dhont ◽  
A. Wilk ◽  
A. Patkowski ◽  
Albert Co ◽  
...  
Keyword(s):  
Electrostatic Interactions ◽  
Colloidal Spheres ◽  
Hydrodynamic Screening

scholarly journals High-concentration zeta potential measurements using light-scattering techniques

2010 ◽  
Vol 368 (1927) ◽  
pp. 4439-4451 ◽  
Author(s):  
Michael Kaszuba ◽  
Jason Corbett ◽  
Fraser Mcneil Watson ◽  
Andrew Jones
Keyword(s):  
Light Scattering ◽  
Zeta Potential ◽  
Electrophoretic Mobility ◽  
Electrostatic Interactions ◽  
Theoretical Models ◽  
High Concentration ◽  
Sample Concentration ◽  
High Concentrations ◽  
Laser Doppler Electrophoresis ◽  
Key Parameter

Zeta potential is the key parameter that controls electrostatic interactions in particle dispersions. Laser Doppler electrophoresis is an accepted method for the measurement of particle electrophoretic mobility and hence zeta potential of dispersions of colloidal size materials. Traditionally, samples measured by this technique have to be optically transparent. Therefore, depending upon the size and optical properties of the particles, many samples will be too concentrated and will require dilution. The ability to measure samples at or close to their neat concentration would be desirable as it would minimize any changes in the zeta potential of the sample owing to dilution. However, the ability to measure turbid samples using light-scattering techniques presents a number of challenges. This paper discusses electrophoretic mobility measurements made on turbid samples at high concentration using a novel cell with reduced path length. Results are presented on two different sample types, titanium dioxide and a polyurethane dispersion, as a function of sample concentration. For both of the sample types studied, the electrophoretic mobility results show a gradual decrease as the sample concentration increases and the possible reasons for these observations are discussed. Further, a comparison of the data against theoretical models is presented and discussed. Conclusions and recommendations are made from the zeta potential values obtained at high concentrations.

Short-range order structure and effective pair-interaction energy in Ni–Si alloys

2007 ◽  
Vol 55 (16) ◽  
pp. 5382-5388 ◽  
Author(s):  
Takumi Hasegawa ◽  
Keiichi Osaka ◽  
Toshihiko Takama ◽  
Haydn Chen
Keyword(s):  
Interaction Energy ◽  
Short Range ◽  
Short Range Order ◽  
Pair Interaction ◽  
Range Order ◽  
Order Structure ◽  
Pair Interaction Energy ◽  
Effective Pair
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