Particles, colloidal

Collimation Collimators (+)-CoUinusin S. collinus Tb 365 Colloidal particles Colloidal silica Colloidal silver Colloidal state Colloidal sulfur Colloid mills Colloids... 

In a study of the viscosity of a solution of suspension of spherical particles (colloids), suggested that the specific viscosity rjsp is related to a shape factor Ua-b in the following way ... 

Saxena A., Sachin K, Bohidar H.B., Verma A.K. 2005. Effect of molecular weight heterogeneity on drug encapsulation efficiency of gelatin nano-particles. Colloids and Surfaces B Biointerfaces 45,42-48. 

Studies performed on CdS [282, 283] have revealed the importance of the microstructure, i.e., crystal structure, crystallite size, and geometrical surface area, in both the control of band structure and the concentration and mobility of charges, in relation to the photocatalytic performance of the photocatalyst. It has been shown also that the solubility product of CdS colloids prepared from acetate buffer aqueous solutions of suitable precursors increases from 7.2x 10 for large particles to about 10 for small (< 2.5 nm) particle colloids, this increase invoking a positive shift on the cathodic corrosion potential [284]. 

Buesseler KO, Bauer JE, Chen RF, Eglinton TI, Gustafsson O, Landing W, Mopper K, Moran SB, Santschi PH, Vernon Clark R, Wells ML (1996) An intercomparison of cross-flow filtration techniques used for sampling marine colloids overview and organic carbon results. Marine Chem 55 1-31 Buffle J, Perret D, Newman M (1992) The use of filtration and ultrafiltration for size fractionation of aquatic particles, colloids, and macromolecules. In Enviroiunental particles. Buffle J, van Leeuwen HP (eds) Lewis Publishers, Boca Raton FL, pl71-230... 

The values of kj calculated by Bacon and Anderson (1982), and used in most models of Th scavenging, varied with particle concentration and ranged from 0.2 to 1.2 Such values are appreciably longer than expected from sorption rates onto particle surfaces. The discrepancy can be explained if dissolved Th is initially sorbed to surfaces of very small particles (colloids) that pass through the typical filters (0.1-0.4 im) used to separate dissolved from particulate fractions (Santschi et al. 1986). 

Bagchi, P., and Birnbaum, S.M. (1981) Effect of pH on the adsorption of immunoglobulin G on anionic poly(vinyltoluene) model latex particles./. Colloid Interface Sci. 83, 460 178. 

Nyffenegger, R., Quellet, C., and Rieka, J. (1993) Synthesis of fluorescent, monodisperse, colloidal silica particles./. Colloid Interface Sci. 159, 150-157. 

Pelizzetti [496] has reviewed the analysed seawater, including particles, colloids, and trace elements, along with their speciation (66 references). 

Figure 1. Schematic of an FFF channel with the separation mechanism for normal FFF shown in detail. Reprinted from [7] Beckett, R. and Hart, B. T. Use of field flow fractionation techniques to characterize aquatic particles, colloids and macromolecules . In Environmental Particles. Vol. 2, IUPAC Series on Analytical and Physical Chemistry of Environmental Systems. Series eds. Buffle, J. and van Leeuwen, H. P., pp. 165-205. Copyright 1993 IUPAC. Reproduced with permission...

Suspended particles in natural and wastewaters vary in diameter from 0.001 to about 100 pm (1 10 9 to 10 4 m). For particles smaller than 10 pm, terminal gravitational settling will be less than about 10 2 cm sec 1. The smaller particles (colloids) can become separated either by settling if they aggregate or by filtration if they attach to filter grains. 

Buffle, J., D. Perret and M. Newman (1992), The use of Filtration and Ultrafiltration for Size Fractionation of Aquatic Particles, Colloids and Macromolecules", in J. Buffle and H.P. v. Leeuwen, Eds., IUPAC Series in Environmental Physical and Analytical Chemistry, Lewis Publ., Chelsea, Ml. 

Higuchi T, Yabu H, Shimomurab M (2006) Simple preparation of hemispherical polystyrene particles. Colloids Surf A Physicochem Eng Asp 284-285 250-253... 

Organosol. A mixture of polymer and plasticizer used for niolding. Organosol comes from the words organic and solvent. The polymer, which is the organic and is typically PVC, in fine particles is rrtixed as a colloid in plasticizer plus a little solvent. It-all forms goo that can be put in a mold. With a little heat, the solvent evaporates, and the plasticizer and polymer-particle colloid form a gel, the final product. 

B. Vincent The Stability of Non-Aqueous Dispersions of Weakly Interacting Particles. Colloids Surfaces 24, 269 (1987). 

Kandori, K. Tamura, S. Ishikawa.T. (1994) Inner structure and properties of diamondshaped and spherical a-Fe203 particles. Colloid Polym. Sci. 272 812-819 Kandori, K. Uchida, S. Kataoka, S. Ishikawa, T. (1992) Effects of silicate and phosphate on the formation of ferric oxide hydroxide particles. J. Mater Sci. 27 719-728 Kandori, K. Yasukawa, A. Ishikawa,T. (1996) Influence of amines on formation and texture of uniform hematite particles. J. Colloid Interface Sci. 180 446-452 Kaneko, K. Inouye, K. (1974) Electrical properties of ferric oxyhydroxides. Bull. Chem. 

Regazzoni, A.E. Matijevic, F. (1983) Formation of uniform colloidal mixed cobalt nickel ferrite particles. Colloids Surfaces 6 189—... 

FTIR analysis of well-defined a-Fe203 particles. Colloids Surfaces A. 134 281-197... 

Abstract A colloidal solution of titanium dioxide (TiO ) nanoparticles was prepared by the solvothermal method and dip-coated onto a polypropylene fabric with TMOS binder. The prepared TiO particles, colloidal solution and the coated fabrics were characterized by X-ray diffraction, SEM and TEM. The results showed that the TiO particles prepared by the solvothermal method were composed of anatase which uniformly coated the snbstrate. Photocatalysis induced bactericidal properties of coated fabrics were tested by measuring the viability of Escherichia coli. It was fonnd that solvothermally prepared TiO coatings have the ability to kill E. coli. This nniqne property of TiO makes it an ideal candidate in producing self-sterilizing protective masks and in providing bactericidal and self-cleaning properties to a variety of snrfaces. 

Two classes of grinding equipment are used to prepare dispersions. The first, the colloid mill, does not effect a particle size reduction but does break down aggregates of fine particles. Colloid mills are used for such powders as clays, precipitated whiting, etc. Sometimes these mills are used to process zinc oxide but for dipped mbber products that is not satisfactory. 

Radford, S.J., Dickinson, E. (2004). Depletion flocculation of caseinate-stabilized emulsions what is the optimum size of the non-adsorbed protein nano-particles Colloids and Surfaces A Physicochemical and Engineering Aspects, 238, 71-81. ... 

Water for use in homes, agriculture, and industry is generally obtained from freshwater lakes, rivers, or underground sources. The water you drink must be purified to remove solid particles, colloidal material, bacteria, and other harmful impurities. Important steps in a typical purification process include preliminary filtration, sedimentation, sand filtration, aeration, and sterilization (Figure 14.11). 

If inter-particle colloidal interactions are assumed to be negligible at high dilution, then a structure factor S(Q) can be defined by... 

Filtration (water treatment) Refers to the physical separation of particles, colloids, or other contaminants from water by passing the liquid through permeable or semipermeable materials (compare with microfiltration, nanofiltration, reverse osmosis, and ultrafiltration). 

Figure 11.1. A conceptual diagram of the size-composition continuum of organic matter in the ocean. The seawater concentration of total organic carbon (TOC) in various size fractions increases with decreasing size of particles, colloids, and dissolved molecules. The percentages of carbon characterized as specific molecules, such as amino acids and neutral sugars, decreases with decreasing size. Most of the organic carbon resides in the ocean as small molecules that have not been structurally characterized.

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