Reliable Electrokinetic Characterization Procedures For Ceramic Powders

1990 ◽  
Vol 180 ◽  
Author(s):  
Jiun-Fang Wang ◽  
Richard E. Riman ◽  
Daniel J. Shanefield
Keyword(s):  
Surface Properties ◽  
Electrolyte Concentration ◽  
Polystyrene Latex ◽  
Time Dependent ◽  
Ceramic Powders ◽  
Concentration Effects ◽  
Important Method ◽  
Solids Loading ◽  
Measuring Surface ◽  
Electrokinetic Characterization

ABSTRACTMicroelectrophoresis Is An Important method for measuring surface properties of colloidal materials. In order to obtain reliable measurements, a good reference colloid must be chosen first, and both the behavior of the reference under a variety of measurement conditions and instrumental factors must be established. Polystyrene latex has proven to be a good reference material. Time-dependent, solids-loading, and electrolyte concentration effects are determined below in order to establish reproducible referencing conditions. Using these referencing conditions, surface properties of silicon nitride as a function of aging time and atmosphere are studied.

Time-dependent effects on physicochemical and surface properties of PHBV fibers and films in relation to their interactions with fibroblasts

2021 ◽  
Vol 545 ◽  
pp. 148983
Author(s):  
Łukasz Kaniuk ◽  
Sara Ferraris ◽  
Silvia Spriano ◽  
Thomas Luxbacher ◽  
Zuzanna Krysiak ◽  
...  
Keyword(s):  
Surface Properties ◽  
Time Dependent

Electrolyte concentration effects on DC voltage electrowetting

2016 ◽  
Vol 240 ◽  
pp. 126-130 ◽  
Author(s):  
Yogesh B. Sawane ◽  
Sandip M. Wadhai ◽  
A.V. Limaye ◽  
Arun G. Banpurkar
Keyword(s):  
Electrolyte Concentration ◽  
Concentration Effects ◽  
Dc Voltage

Untersuchung der elektrischen Leitfähigkeit homologer N-(4-n-Alkyloxybenzyliden)-4'-n-butylaniline im nematischen und smektischen Phasenbereich / Investigation of the Electrical Conductivity of Homologous N-(4-n-alkoxybenzylidene)-4'-nbutylanilines in the Nematic and Smectic Phases

1976 ◽  
Vol 31 (12) ◽  
pp. 1700-1706 ◽  
Author(s):  
G. Heppke ◽  
F. Schneider ◽  
A. Sterzl
Keyword(s):  
Electrical Conductivity ◽  
Chain Length ◽  
Nematic Phase ◽  
Alkyl Chain ◽  
Electrolyte Concentration ◽  
Alkyl Chain Length ◽  
Anisotropy Ratio ◽  
Concentration Effects ◽  
Smectic Phases ◽  
Nematic Phases

Abstract Investigation The electrical conductivity of the first eight homologous N-(4-n-alkoxybenzylidene)-4'-n-butylanilines is investigated in the isotropic, nematic and smectic phases using the electrolyte tetra-butylammonium picrate. The anisotropy ratio of the electrical conductivity shows pretransition behaviour in the nematic phases close to the transition to the smectic phases. This behaviour be-comes more distinct with increasing alkyl chain length of the liquid crystals. In the nematic phase of 40·4 an anisotropy ratio of V = 0.55 is determined at the lowest electrolyte concentration. Values of about V=0.05 were found in the smectic phases of several homologues. In the nematic phase, an increase of the electrolyte concentration effects an increase of the anisotropy ratio. This effect is systematically enhanced with increasing alkyl chain length.

A study of surfactant micelles with a fluorescent probe

1976 ◽  
Vol 29 (1) ◽  
pp. 1 ◽  
Author(s):  
U Khuanga ◽  
BK Selinger ◽  
R McDonald
Keyword(s):  
Fluorescence Spectra ◽  
Electrolyte Concentration ◽  
Fluorescence Probe ◽  
Fluorescence Decay ◽  
Time Dependent ◽  
Ionic Surfactants ◽  
Simple Method ◽  
Surfactant Micelles ◽  
Full Analysis ◽  
Effect Of Oxygen

The fluorescence probe technique has been used to study micelles of anionic, cationic and non-ionic surfactants. The solute was pyrene. The formation of a fluorescent excited dimer (excimer) by pyrene means that this probe can be used not only to explore intramicellar kinetics, but also to monitor the manner in which micelles change their size. The change in size of ionic surfactants with electrolyte concentration and of non-ionic surfactants with temperature is explored. We have developed a simple method involving the effect of oxygen (in air) on the fluorescence spectrum for detecting statistical distribution effects in the solubilization of pyrene in micelles. The combination of fluorescence spectra with time-dependent fluorescence intensity (fluorescence 'decay') allows a full analysis.

scholarly journals The zeta potential measurements in sandpacks saturated with monovalent electrolytes

2018 ◽  
Vol 34 (2) ◽  
Author(s):  
Luong Duy Thanh
Keyword(s):  
Zeta Potential ◽  
Surface Properties ◽  
Electrolyte Concentration ◽  
Particle Surface ◽  
Binding Constants ◽  
Sand Particles ◽  
The Difference ◽  
Group 2 ◽  
Good Agreement ◽  
Group 1

Measurements of the zeta potential in sandpacks saturated with monovalent electrolytes at six different electrolyte concentrations have been reported. The values we record are classified into two groups based on the magnitude of the zeta potential: group 1 (samples S1 and S2) and group 2 (samples S3 and S4). The measured zeta potential in magnitude in group 1 is much smaller than that in group 2 and in literature at the same electrolyte concentration. The reason for a big variation of the zeta potential between group 1 and group 2 may be due to the difference in technique of making sand particles of different size leading to change of particle surface properties. Consequently, the zeta potential that depends on the surface properties would vary. The results show that there is a gradual decrease in the zeta potential with increase in monovalent electrolyte concentration (from 10−4 M to 10−2 M). Additionally, the empirical expressions between the zeta potential and electrolyte concentration are obtained in this work for both group 1 and group 2. The obtained expression for group 2 is in good agreement with those available in literature. From the experimental data in combination with a theoretical model, the binding constants for Na+ and K+ cations are obtained for the samples of group 2 and they are in the same range reported in literature for silica-based samples. 

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