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The employed dispersion medium in this case was acetone.
In any case, the dispersion of the organomodified clays in a waterborne resin requires the initial dispersion of the particles in a compatible solvent-based dispersion medium. The nature of solvents, therefore, and their compatibility with the clay modifier and the water could determine the quality of this dispersion and the final nanocomposite structure.
We also offer a simple algebraic method for determination, under given temperature and external pressure, of the average volumetric mass density of the LD components--of the maximum sediment and the maximum emergent, as well as the dispersion medium, without using pycnometers as discussed by Westwood and Kabadi [4] or densitometers as discussed by Puttmer et al.
There is not a physical theory, yet, for the quantitative determination of the dispersion phase and the dispersion medium of LD.
The analysis of the radial particle structure given rests on measurements of the SAXS intensities at different contrasts of the density of the particles with respect to the dispersion medium. For spherical symmetric particles with radius [R.sub.i] the scattering amplitude [A.sub.i](q) is given by (8):
For the contrast-variation measurements, the mass density of aqueous dispersion medium was raised by adding sodium chloride or sucrose to the latex dispersions.
Similarly, the DFC-PC samples had maximum solubility of about 50.2% in 1.0M NaCl solution and more than 80% in 0.1M NaCl dispersion medium. At the lower salt (0.1M NaCl) concentration, the solubility of both FFC-PC and DFC-PC samples increased slightly in the [P.sup.H] range 8.0-10.5 indicating the "salting-in" effect while at higher salt concentration (1.0M NaCl), the solubility decreased which revealed the "salting-out" effect on the complex protein system.
Colloids may be divided into two major classes: the type that readily goes into solution is called a lyophilic (solvent-loving) colloid (hydrophilic if the dispersion medium is water), and the type prepared from sparingly soluble substances is called a lyophobic (solvent-hating, hydrophobic in the case of water) colloid.
Metallic sols have especially bright color, owing to the great difference in densities and, consequently, in the refraction indices of the dispersed phase and the dispersion medium. In general, the color of sols may be very intense, even more so than the color of molecular solutions.
The use of surfactants in polymerization bath is believed to create a reactor vessel in the dispersion medium via micelle formation in which the mono-mer is confined in a limited environment and to im-prove the polymer's physical properties like solubili-ty in organic solvents conductivity stability and pro-cessibility [11].
The hydrophobic portions adsorb to the particle surfaces and the hydrophilic portions extend into the water-based dispersion medium, creating the steric barrier.
For this purpose, they used a dispersion medium comprised of dimethylsulfoxide and ethanol.