Measurement of electrophoretic mobility

A measurement of electrophoretic mobility /v, gives x = 0.02 cm s-1, where v is the velocity observed under a field, and x the mobility. Calculate the zeta potential of the colloid concerned. (Bockris)... 

The of normal RBCs suspended in dextran solutions can be determined from measurements of electrophoretic mobility (u), fluid viscosity (Tf), and the dielectric constant (c) (29). 

In situ estuarine measurements of electrophoretic mobility would be interestingly completed by estimations of the effect of ionic strength and of some specified dissolved components of sea water on the sampled particles. 

Beside of the progress in the theory of a particle movement in the zetameter measurement cell, there was progress in particle measurement techniques. New models of zetameters enable automatic measurement of electrophoretic mobility on the basis of the shift of light wave scattered on the particle that moves in the electric field [82]. This technique is called photon correlation spectroscopy (PCS). To increase the sensitivity of the measurement, it is supported by multiangle electrophoretic light scattering (ELS). This combination, allows one also to measure the particle size distribution of the dispersed phase [83]. 

Dalgleish, D.G. 1984. Measurement of electrophoretic mobilities and zeta-potentials of particles from milk using laser Doppler electrophoresis. J. Dairy Res. 51, 425 138. 

The assembly of multilayers on SBH particles was observed by measurements of electrophoretic mobility (Fig. 1). Z-potential measurements were taken after each adsorption step. The reversal of charge showed the growth of nanofilms onto surface of SBH microparticles. 

Other types of interactions (complexation, adsorption, coacervation) may be of concern for the performance of water-soluble cellulose macromolecules. Only illustrative recent examples will be discussed here. The complexation of various additives (low-molecular solutes, surfactants, other macromolecules) with cellulose derivatives has been investigated using a variety of methods including dialysis [106], osmometry [107], and measurements of electrophoretic mobility... 

A set of equilibrium constants has been determined (18) which is compatible with experimental observations. These constants can now be used to make generalizations and to predict adsorption isotherms and the fixed surface charge of FeOOH as a function of pH and other solution variables. A satisfactory agreement between model calculations and experimental results (adsorption data and measurements of electrophoretic mobility) is obtained. 

James and Healy (26) have shown with measurements of electrophoretic mobility that in systems of a colloid oxide and metal ions two... 

One significant application of ADSEP electrophoresis is direct measurement of electrophoretic mobilities as demonstrated in the present work. Capillary zone electrophoresis (CZE) is normally used to measure the electrophoretic mobility of solutes in free solution. Several undesirable features of CZE are absent in the present version of ADSEP, namely ... 

Use of surface speciation models for prediction of adsorption and transport requires specification of the mode of bonding and speciation of oxyanions on oxide surfaces. FTIR spectroscopy (especially ATR and DRIFT) offers the potential to establish symmetry of surface species, protonation, and determination of monodentate or bidentate bonding. Determination of surface speciation is greatly enhanced when the spectroscopic information is combined with measurements of electrophoretic mobility (EM), calculation of point of zero charge and proton balance measurements before and after adsorption. We review adsorption of phosphate, carbonate, boron, selenate and selenite on Fe and A1 oxides. New preliminary spectra and EM and proton balance information for arsenate and arsenite adsorption on amorphous Fe and A1 oxide suggest that HASO4 and H2ASO3 are the dominant surface species. 

Measurement of Electrophoretic Mobility of Microcapsules. We measured the electrophoretic mobility of poly(L-lysine-a/r-terephthalic acid) microcapsules with... 

In Equation 8.15 the surface potential, xj/Q, is usually equated to C, the zeta potential as determined from measurements of electrophoretic mobility. The two quantities are by no means always identical, but in view of the experimental difficulties of assessing j/o, zeta potential may be used as a close approximation. C is the experimentally accessible potential difference between the bulk solution and the electrokinetic slipping plane or plane of shear which is situated in the diffuse layer close to the immobile Stern layer. (The meaning of these planes in molecular terms when a long chain hydrophilic non-ionic surfactant is adsorbed at the globule surface is not clear). 

Adsorbent materials are used medicinally to absorb toxins in vivo. The enterotoxin of Pseudomonas aeruginosa is implicated in the aetiology of diarrhoea adsorbents such as kaolin are used to decrease the toxicity of such agents by removal of the toxin by adsorption. Armstrong and Clarke have investigated the adsorption sites on kaolin by measurement of electrophoretic mobility in the presence of surfactants and other materials as a function of pH [58]. In particular they studied the uptake of gentian violet on to koalin treated with anionic and cationic agents. Kaolin pretreated with cetrimide showed a marked decrease in adsorptive capacity. On the other hand, when pretreated with sodium hexadecyl sulphate the adsorptive capacity was increased (Fig. 9.22). 

Simultaneous measurements of electrophoretic mobility, self-diffusion coefficient, and fluorescence-detected linear dichroism indicate that, with a polymer... 

Kameyama, K., Takagi, T., Measurement of Electrophoretic Mobility of SDS Simple Micelles and mixed Micelles with a Non-ionic Surfactant, Octaethylene Glycol Dodecyl Ether, by Electrophoretic Light Scattering with the Correction for Electroosmotic Flow, J. Colloid Interface Sci, 1990, 140, 517-524. 

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