A role of free silanol groups of nanosilica surface in interaction with poly(vinyl pyrrolidone)

Olga Voronina, Maria Malysheva, Liudmyla Nosach, Eugeny Voronin, Vladimir Gun’ko, Barbara Charmas, Jadwiga Skubiszewska-Zięba

Abstract


In this work, a role of the number of free silanol groups at a nanosilica surface (specific surface area SBET = 250 m2/g, initial amount of silanols αОН = 0.60-0.62 mmol/g) was analyzed in interaction with poly(vinyl pyrrolidone) (PVP) vs. the degree (QTMS) of silica hydrophobization by hexamethyldisilazane at 100 oC. The value of QTMS was 0.07, 0.42, 0.67, 0.81, 0.82, and 1.0. Adsorption of PVP onto a nanosilica surface was carried out from a water and water-ethanol (1:1) solutions of the polymer. It was shown that free silanol groups play a crucial role in the adsorption of poly(vinyl pyrrolidone). The value of the maximal adsorption (monolayer capacity) on completely hydrophobic nanosilica surface is approximately by 6.5 times lower than that for unmodified nanosilica

Keywords


Nanosilica, Silanol groups, Hydrophobization, Hexamethyldisilazane, Poly(vinyl pyrrolidone) adsorption

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DOI: http://dx.doi.org/10.17951/aa.2017.72.2.51-66
Date of publication: 2018-09-10 09:42:26
Date of submission: 2018-02-15 08:37:04


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Copyright (c) 2018 Olga Voronina, Maria Malysheva, Liudmyla Nosach, Eugeny Voronin, Vladimir Gun’ko, Barbara Charmas, Jadwiga Skubiszewska-Zięba