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Modification of hydrophilic/hydrophobic character of tio2 surface using selected silane coupling agents

Siwińska-Stefańska K., Krysztafkiewicz A., Jesionowski T.

Physicochemical Problems of Mineral Processing

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2007

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Vol. 41

205-214

EN

In the studies R-213 titanium white was used, produced by Chemical Works Police S.A. Modification of titanium dioxide surface was conducted in order to alter its physicochemical properties. In this aim for modification organic coupling agents were employed, containing vinyl, amine and metacryloxy functional groups. Effects of concentration of the silane coupling agent (0.5, 1 or 3 weight parts) on dispersive properties and on morphology of TiO2 particles were examined. In the studies advantage was taken of SEM and NIBS techniques. For the obtained in this way products elemental composition, particle size distribution, BET specific surface area and rate of sedimentation in water were examined. Surface modification changes hydrophilic/hydrophobic character of the obtained preparations, promoting also agglomeration of TiO2 particles.

PL

W badaniach wykorzystano biel tytanową R-213 produkowaną przez Zakłady Chemiczne Police S.A. Modyfikację powierzchni ditlenku tytanu prowadzono w celu zmiany jej charakteru fizykochemicznego. W tym celu do modyfikacji zastosowano organiczne związki wiążące z następującymi grupami funkcyjnymi: winylową, aminową i metakryloksy. Badano wpływ stężenia silanowego związku wiążącego (0,5; 1 i 3 cz.wag.) na właściwości dyspersyjne i morfologię cząstek TiO2. W badaniach wykorzystano techniki SEM i NIBS. Dla otrzymanych w ten sposób produktów określono skład elementarny, rozkład wielkości cząstek, powierzchnię właściwą BET oraz tendencję do sedymentacji w wodzie. Modyfikacja powierzchni zmienia charakter hydrofilowo-hydrofobowy otrzymanych preparatów, jednocześnie przyczyniając się do aglomeracji cząstek TiO2.

2

Precipitation methods of coloured silicates and oxides - highly dispersed pigments

Klapiszewska B., Krysztafkiewicz A., Jesionowski T.

Polish Journal of Chemical Technology

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2006

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Vol. 8, nr 4

106-108

EN

Studies were performed on the production of highly dispersed green pigments, chromium(III) and nickel(II) silicates and oxides in emulsion systems. Appropriately selected parameters in which the process was conducted permitted to obtain pigments of optimum utility properties. The obtained pigments were subjected to a physicochemical analysis, i.a., their principal physicochemical properties were established, the including particle size, particle size distribution and the morphology of the particle surface.

3

Application of reduced chromate solutions for precipitation of silicate pigments

Klapiszewska B., Krysztafkiewicz A., Jesionowski T.

Polish Journal of Chemical Technology

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2003

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Vol. 5, nr 4

31-33

EN

New method was worked out for utilisation of postgalvanic refuse containing chromates(VI) Chromates contained in the refuse solution were reduced to chromium(III) compounds using hydrogen peroxide or hydrazine. The obtained chromium(III) hydroxide was subsequently passed to a solution using sulphuric acid. The studies pertained production of pigments, chromium(III) silicates obtained by precipitation from solutions of chromium metasilicate and chromium sulphate. The obtained pigments were analysed using, modern investigative techniques: SEM technique in studies on morphology and DLS technique in studies on particle size and particle tendency to form agglomerate structure.