Скачать полную версию статьи (в PDF формате)
стабилизация, реология, наночастицы, пирогенный диоксид кремния, водоугольные суспензии
«Адсорбция глицина и её влияние на электрокинетический потенциал и устойчивость суспензий многослойных углеродных нанотрубок»
PACS numbers: 61.48.De, 68.37.Lp, 68.43.Mn, 82.45.Tv, 82.70.Kj, 83.80.Hj, 87.15.Tt
Kinetics and equilibrium adsorption of glycine by carbon nanotubes (NTs) at pH 6.0 in aqueous suspension are determined. The adsorption equilibrium is reached after 60 min contact between the glycine and NTs. Several steps on the isotherm of glycine adsorption onto the NT surface are observed. It is supposed that the glycine molecules in the first monolayer are oriented flatly on the surface by their hydrocarbon part, and they are interacting electrostatically with the surface functional groups of NTs by means of the amides of glycine. Adsorption of glycine significantly influences on the NT electrokinetic potential only in the region of polymolecular adsorption, and its absolute value as a function of the amino acid concentration goes through a maximum. As shown, the adsorption of glycine can promote flocculation of the NTs???glycine suspension.