Bonded Water In Suspensions
BONDED WATER IN SUSPENSIONS
OF CARBOSILES AND SILICA MODIFIED
WITH THE ADSORBED PEG MOLECULES
V. V. Turov1, R. Leboda2, V. M. Gun`ko1, J. Skubiszewska-Zięba2
1Institute of Surface Chemistry, NAS, Pr.Nauki 31, 252022 Kiev, Ukraine
2Dep. of Chemical Physics, Faculty of Chemistry, Maria Curie-Skłodowska University, Pl. Marii Curie-Skłodowskiej 3, 20-031 Lublin, Poland
The plot of gS = f(CPEG) dependence for all adsorbents is shown in Fig.1.
Carbonized silicas (CS) are complex carbon-mineral adsorbents, which may be utilized as polymer fillers, supports of stationary phases in gas and liquid chromatography as well as adsorbents capable of stable bonding either
of polar or of nonpolar molecules. Surface properties of CS adsorbents may be regulated by appropriate modification of their surface consisting in adsorption of polymer molecules especially of polyethylene glycol (PEG) molecules. Such adsorbents may be widely used in different fields of techniques and technology.
The aim of this paper was determination of characteristics of water layers bonded on the surface of initial silica and CS differ of carbon deposit concentration as well as of the changes occurring in these layers during adsorption of PEG molecules on the surface of this silica.
The measurements were performed by 1H NMR spectroscopy method together with the procedure of liquid phase freezing. By means of this method, there can be determined from the temperature dependence of NMR signal intensity at T
It may be concluded that for A-300 and CS4 (silica and mozaic structure of the surface) the proportional increasing of the free surface energy of adsorbents at the initial stage of the polymer adsorption there is take place. For CS40 (carbon surface) gS remain constant in wide region of CPEG.
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