A Comparative Study on the Adsorption of Triton X-100 and Tween 20 onto Latexes with Different Interfacial Properties
✍ Scribed by A. Martı́n-Rodrı́guez; M.A. Cabrerizo-Vı́lchez; R. Hidalgo-Álvarez
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 195 KB
- Volume
- 187
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
are very effective in sterically stabilizing emulsions and dis-In this paper we have studied the adsorption of two nonionic persions. Most of their applications are related to colloidal surfactants, Triton X-100 and Tween 20 (polyoxyethylene (20) science. To be effective in the above-mentioned applications sorbitan monolaurate) onto latexes with different interfacial propthe surfactant must be adsorbed in the appropriate amount erties. Four different samples of polystyrene beads were used in and orientation for the optimal desired effect. For this reason, this study. A hydrophobic sample was prepared by conventional the adsorption of nonionic surfactants and their effects on emulsion polymerization of styrene. Hydrophilic polymer colloids the stability of the complexes so formed have been widely
were prepared by the emulsifier-free emulsion copolymerization studied. It is well known that the adsorption of surfactants of styrene and 2-hydroxyethylmethacrylate in different proporto colloidal dispersion modifies the interparticle interaction tions and acrylic acid. In all cases potassium persulfate was used as initiator. In order to consider the mechanism of the adsorption and therefore their colloidal stability (1-3). There are also at the different liquid-solid interfaces, adsorption isotherms under many works on the effect of the surface polarity on the different pH and ionic strength conditions were performed. Elecamount of surfactant adsorbed (4-6).
trokinetic characterization and colloidal stability of bare hy-
Another important reason to study the effect of the adsorpdrophobic and hydrophilic latexes and the surfactant-latex comtion of nonionic surfactants onto latexes is a consequence of plexes were compared to understand the effect of the nonionic their application in the development of immunoassays. Nonsurfactant on the electric double layer structure. The results ionic surfactants are used to suppress nonspecific interactions showed that Tween 20 and Triton X-100 are adsorbed in the same of the complementary antigen and to increase the stability of way on surfaces with different polarity but in different amounts.
the sensitized particles in the reaction medium (7).