Ir-spectral Study Of Adsorption

Category: VI Ukrainian-Polish Symposium

IR-spectral study of adsorption

of macromolecules onto pyrogenic silicas

by different surface textures

E.F. Voronin1, N.V. Guzenko1, E.M. Pakhlov1, I.F. Mironiuk1,

M.L. Malyseva2, N.N. Vlasova1

1Institute of Surface Chemistry, Ukrainian National Academy of Sciences, General Naumov st. 17, 03164 Kyiv, Ukraine

2 National Taras Shevchenko University, Kyiv, Ukraine

A series of pyrogenic highly disperse silicas was synthesized by adjustment of the hydrogen and oxygen flows and degree of a gas stream turbulence. These silicas have close specific surface value and contents of free silanol groups, but differ by hydrophilicity, which is characterized by monolayer capacity of adsorbed water (Am). The synthesized silicas (except control sample prepared by standard technology) have porosity. The differences of values Am and AB (water adsorption in the point B) as well as the presence of hysteresis are evidence of it.

The interaction of polymeric compounds (polyvinylpyrrolidone – PVP, М=12000; polyoxyethylene – POE, М=300000; and bovine serum albumin – BSA, М=68000) with a surface of the synthesized silicas from water solutions was investigated by IR-spectroscopy method. Free silanol groups, which are the main sorption and chemisorption centres of highly disperse silica surface, are displayed in IR-spectra as an intensive narrow absorbance band with a maximum at 3750 cm-1. The adsorption of the above-stated macromolecules occurs due to formation of numerous hydrogen bonds with free silanol groups. In this case the absorbance at 3750 cm-1 disappears and the wide band at 3350cm-1 characterizing indignant silanol groups appears.

It has been fixed that in every case after adsorption of examined compounds in enough quantity to form monolayer in IR-spectra the complete disappearance of free silanol groups absorbance band is observed. It means that free silanol groups of all synthesized silicas are accessible to interaction with the large molecules, and macroporosity of samples does not preclude with this.



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