Dielectric Relaxation of Colloidal Particle Suspensions at Radio Frequencies Caused by Surface Conductance

1995 ◽  
Vol 99 (2) ◽  
pp. 780-789 ◽  
Author(s):  
G. Blum ◽  
H. Maier ◽  
F. Sauer ◽  
H. P. Schwan
Keyword(s):  
Dielectric Relaxation ◽  
Colloidal Particle ◽  
Surface Conductance ◽  
Particle Suspensions ◽  
Radio Frequencies

Slot coating flows of non-colloidal particle suspensions

AIChE Journal ◽  
2016 ◽  
Vol 63 (3) ◽  
pp. 1122-1131 ◽  
Author(s):  
Diego M. Campana ◽  
Luis D. Valdez Silva ◽  
Marcio S. Carvalho
Keyword(s):  
Colloidal Particle ◽  
Particle Suspensions ◽  
Coating Flows ◽  
Slot Coating

Rheological Study of Two-Dimensional Very Anisometric Colloidal Particle Suspensions: From Shear-Induced Orientation to Viscous Dissipation

Langmuir ◽  
2013 ◽  
Vol 29 (17) ◽  
pp. 5315-5324 ◽  
Author(s):  
A. M. Philippe ◽  
C. Baravian ◽  
V. Bezuglyy ◽  
J. R. Angilella ◽  
F. Meneau ◽  
...  
Keyword(s):  
Viscous Dissipation ◽  
Colloidal Particle ◽  
Two Dimensional ◽  
Particle Suspensions ◽  
Rheological Study

Erratum: Dielectric relaxation in CH3X molecules at radio frequencies

1980 ◽  
Vol 58 (11) ◽  
pp. 1658-1658
Author(s):  
Robert S. Struk ◽  
Robin L. Armstrong
Keyword(s):  
Dielectric Relaxation ◽  
Radio Frequencies

scholarly journals H2O/D2O Contrast Variation for Ultra-Small-Angle Neutron Scattering to Minimize Multiple Scattering Effects of Colloidal Particle Suspensions

2018 ◽  
Vol 2 (3) ◽  
pp. 37 ◽  
Author(s):  
Akira Otsuki ◽  
Liliana de Campo ◽  
Christopher Garvey ◽  
Christine Rehm
Keyword(s):  
Neutron Scattering ◽  
Multiple Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Colloidal Particle ◽  
Scattered Intensity ◽  
Particle Suspensions ◽  
Scattering Effects ◽  
Multiple Scattering Effects ◽  
Q Values

This study investigated the use of solvent contrast (H2O/D2O ratio) as a means to optimize the ultra-small-angle neutron scattering (USANS) signal. By optimizing the signal, it was possible to reduce the undesirable effects of coherent multiple scattering while still maintaining a measurable scattered intensity. This result will further enable the use of USANS as a probe of the interactions between colloidal particles and their structures within concentrated suspensions as well as particle dispersion/aggregation. As a model system, we prepared silica colloidal particle suspensions at different solid concentrations. USANS curves were measured using the classical Bonse–Hart double crystal diffractometer while varying the scattering length density of the aqueous phase, thus varying the contrast to the silica particles. As a means of assessing the impact of multiple scattering effects on different q-values, we analyzed the scattered intensity at different contrasts at three different q values. The data were then used to determine the match point of the silica particle suspensions from the expected square root dependence of the scattered intensity with solvent composition, to analyze any differences associated with the solid concentration change, and to determine the optimum H2O/D2O ratio in terms of high transmission (TSAS > 80%) and high enough scattering intensity associated with the contrast of the system. Through this investigation series, we confirmed that adjusting the contrast of the solvent (H2O/D2O) is a good methodology to reduce multiple scattering while maintaining a strong enough scattering signal from a concentrated suspension of silica particles for both USANS and rheometric USANS (rheo-USANS) experiments.

Double Dielectric Relaxation of Non-Confocal Membrane-Covered Ellipsoidal Particle Suspensions

1975 ◽  
Vol 30 (12) ◽  
pp. 1675-1679 ◽  
Author(s):  
Hideo Ichimura ◽  
David Feinstein ◽  
Richard F. Schwartz
Keyword(s):  
Dielectric Constant ◽  
Dielectric Relaxation ◽  
The Other ◽  
Complex Dielectric Constant ◽  
Particle Suspensions ◽  
Ellipsoidal Particle ◽  
Shape Factors ◽  
Ellipsoidal Particles

Abstract The complex dielectric constant of suspensions of membrane-covered ellipsoidal particles is formulated in terms of the complex dielectric constant of the interior, the membrane and the medium, the volume ratios p and q, and the shape factors n1 and n2. It is not necessary for the two ellipsoidal interfaces (one between the interior and the membrane, the other between the membrane and the medium) to be confocal, nor for the thickness of the membrane to be uniform. The result is factorized to demonstrate double relaxation.In addition, the blurring mechanism of multiple relaxation is naively explained.

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