Colloids polyethylene glycols

The stabilizing of aqueous latexes succeeded by using emulsifiers (anionic, nonionic) and/or their mixture, steric stabilizators (polyvinyl alcohol (PVOH), hydroxyethyl cellulose, polyethylene glycol, new protective colloids etc.), and polymerizable surfaces active agents, in general. Vinyl acetate (VAc) emulsion homopolymers and copolymers (latexes) are widely used as binders in water-based interior and exterior architectural paints, coatings, and adhesives, since they have higher mechanical and water resistance properties than the homopolymers of both monomers [2, 4, 7]. 

Vandegriff KD, McCarthy M, Rohlfs RJ, et al. Colloid osmotic properties of modified hemoglobins chemically cross-linked versus polyethylene glycol surface-conjugated. Biophys Chem 1997 69 23. 

To measure the pH, remove 5-mL aliquots from the stock of colloidal gold, and add two drops of 1% polyethylene glycol. Do not add the PEG to the colloidal gold stock. Discard aliquots after reading pH. 

Polyethylene glycol has been used as reducing and stabilizing agent for Au NPs. The stability of the resulting Au colloids and the reaction rates are dependent on polymer molar mass. The Au NPs are characterized using UV-Vis, analyzing the plasmon bands [108]. 

Vinogradov, S., E. Batrakova, and A. Kabanov. 1999. Polyethylene glycol)-polyethyleneimine NanoGel particles Novel drug delivery systems for antisense oligonucleotides. Colloids Surf B Biointerfaces 16 291. 

Li N, Zhang S, Li X et al (2009) Effect of polyethylene glycol (PEG-400) on the l-butyl-3-methylimidazolium tetrafluoroborate-in-cyclohexane ionic liquid microemulsion. Colloid Polym Sci 287(1) 103-108... 

Metal complexes prepared by reacting less than one mole of an alkanolamine with an excess of a polyhydric alcohol, such as polyethylene glycol 200—400 or glycerol, reportedly impart a greater degree of thixotropy to systems containing protective organic colloids (501). 

Kollicoat IR is a unique polymer for pharmaceutical applications prepared by a graft polymerization process of polyethylene glycol (25%) with polyvinyl alcohol (75%). Kollicoat IR dissolves quickly in water and aqueous solutions of acid and alkali and reduces the surface tension of aqueous solutions to allow the solutions to have high spray rates. The polymer film is very flexible, not tacky, and easily colored. The polymer can be used as instant release coating, pore former, binder, protective colloid, etc. 

An elegant example of the analysis of colloid surfaces containing covalently attached hydrophilic species has been provided by Brindley et al who studied the surface chemistry of polystyrene colloids with surface grafted polyethylene glycol groups [39]. These colloids were prepared by surfactant-free copolymerization of styrene with PEG using potassium persulphate as an initiator. The XPS analysis of these microparticles is shown in Fig. 11. 

Glidants and lubricants boric acid, colloidal silica, hydrogenated vegetable oils, magnesium stearate-polyethylene glycols, stearic acid, talc. 

The colloidal gold should be diluted in PBS without calcium and magnesium containing 1% BSA or 0.01% polyethylene glycol (mol wt 20,000), or in TBS plus 1% BSA or 0.01% polyethylene glycol (mol wt 20,000). Let the picric acid/water stand it will keep indefinitely at room temperature. Do not let the picric acid dry since the powder is explosive. 

The sonication was carried out in a Bandelin Sonopuls HD 3200 system with 200 W input power and working frequency of 20 kHz, 50% amplitude. In the experiments, 2 g of cobalt carbonyl (5.8 mmol) were dissolved in 100 ml of the deionized water (sample 1) or in a water-alcohol (1 1 volume) mixture (sample 2) until the formation of colloidal solution. Then 0.5 g of polyethylene glycole was added to the mixture. The resulted solution was purged with argon for 10 min before the ultrasonication and also during the reaction. The high-intensity Ti horn with a diameter of 6 mm and tip surface area of 113 mm was used. The ultrasonication was carried out for 40 min. The resulted solutions were... 

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