Cation latexed

A few commercial cationic latexes are offered, eg, by Du Pont Showa and Denki. These are stabilized with quaternary ammonium surfactants. 

Cationic latexes, 19 855 Cationic metallocene complexes, 16 90 Cationic monomers, of water-soluble polymers, 20 475-482 Cationic nickel ligand complexes,... 

A cationic latex particle of 60 nm diameter was modified with cobalt phthalo-cyaninetetrasulfonate (CoPcTs) via an ionic bond (13). The immobilized CoPcTs exhibited extremely high catalytic activity in autoxidation of 1-decanethiol. 

Figure 14. Changes in stability of an anionic polystyrene latex (particle diameter = 52.7 nm) admixed with a cationic latex (particle diameter = 43.4 nm). N+ and N. = the number concentration of the cationic and anionic latices, respectively (-A-) 10 3 mol dm 3 sodium chloride solution (-O-) 2 X 10 3 mol dm 3 sodium...

Figure 15. Scanning electron micrograph illustrating the heterocoagulation of cationic latex particles (diameter = 0.43 fj/n) onto a negatively charged latex particle (diameter = 2.14 pm)...

Delair T, Meunier F, Elaissari A, Charles MH, Pichot C (1999) Amino-containing cationic latex-oligodeoxyribonucleotide conjugates application to diagnostic test sensitivity enhancement. Colloids Surf A Physicochem Eng Asp 153 341-353... 

Comprised of a swellable polymer and a novel cationic latex particle. 

Effect of Surfactant Structure on the Electrodeposition of Cationic Latexes... 

The effect of emulsifier structure on the electrodeposition of cationic latexes has been investigated. The electrocoating performance of these systems can be correlated with the reducibility of the emulsifier. 

Latexes stabilized with fully ionized groups such as sulfonate ions are well known in the coatings field. But, they have not been utilized in electrodeposition because they do not cut off current. This is not the case for certain cationic latexes. An electrodeposition process based on sulfoniiim stabilized colloids has been reported (4). The sulfonium ion, like the analo-... 

Clear curves with a single relaxation time could also be observed spectrophotometrically by mixing the anionic latex with an excess amount of cationic latex. The reciprocal relaxation time measured spectrophotometrically under the same experimental condition as in Figure 1 (0.0094 s ) is in good agreement with the value obtained by microscopy (0.0091 s ). This shows that the relaxation phenomena observed spectrophotometrically correspond to the binary association of particles of opposite charges provided that the spectrophotometry can be carried out at the very initial stage. 

We could obtain the first-order rate constant k j (=1/t) at various concentrations of the cationic latex by the° first-order analysis. We will subsequently discuss the association process between oppositely-charged latex particles using spectrophotometric data obtained in water. The second-order rate constant k, for the... 

Figure 4.29 gives an IllustrationThe system Is a homodlsperse cationic latex with surface charge 14.2 pC cm at pH = 6.0. It Is seen that the maximum In transposes Into the zeta potentials If the Helmholtz-Smoluchowskl (HS) equation 14.3.4) is used. Application of O Brien-White (OBW) theory (fig. 4.26) implies an improvement. Now, together with double layer polarization. K is accounted for, but the maximum fully disappears only if K Is also Included. In this case this was done in terms of a theory by Semenlkhin and Dukhin (SD) where the diffuse layer was assumed to extend down to the peirtlcle surface and to contain mobile Ions everywhere 2) similar observation was made by... 

S2.7nm) with sulfete-groups on the surfoce the cationic latex was also polys ene (diameter 43.4 nm) with surface amidine groups. It can be seen from Fig. 24 that the system becomes completely unstable when the ratio N / N+ + W ) reaches 0.25. 

Fig. 25. Scanning electron micrograph showing the heteiocoagulaiion ot cationic latex particles (radius = 22 nm) onto a negatively charged particle (radius = t. 07...

Devries, E.F.A., Schasfoort, R.B.M., Vanderplas,)., and Greve,). (1994) Nucleic acid detection with surface plasmon resonance using cationic latex. Biosensors i Biodectronics, 9 (7),... 

Autoxidation reactions of organic compounds are quite widespread and Co(lll) is among the most generally active metal ions serving as a catalyst in such reactions [36]. Cobalt—phthalocyanine tetrasulfonate bound cationic latexes have been... 

An elegant example of SPE method based on ion-exchange retention was used for inline preconcentration of inorganic anions. A single capillary containing a preconcentration zone (adsorbed layer of cationic latex particles) and a separation zone (fused-silica modified by adsorption of a cationic polymer) was used. Analytes were retained in the preconcentration zone and eluted isota-chophoretically into the separation zone by means of an eluotropic gradient. This approach was used to determine nitrate in Antarctic ice cores at the 2.2-11.6 p,g L" level. 

Xu et al. heterocoagulated cationic PMMA latex particles of an estimated 150-200 nm in diameter with various clays, Montmorillonite (GelWhite GP and Cloisite Na+) and (fluoro)hectorites (Laponite RD, RDS, B, S, JS), having plate dimensions between 25 and 600 nm. No details on the stable colloidal armored structures were reported. Mass coagulation was induced in order to obtain a nanocomposite bulk material, which was further analyzed [23]. Chen et al. [24] added Ti02 and SiOi/TiOi nanoparticles with a positive surface charge at a very low pH of 0-2 to both anionic and cationic latexes based on PMMA. A bulk nanocomposite blend was analyzed. 

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