New organophilic kaolin clays based on single-point grafted 3-aminopropyl dimethylethoxysilane

Physical Chemistry Chemical Physics : PCCP
A ZahariaA Sarbu

Abstract

In this study, the organophilization procedure of kaolin rocks with a monofunctional ethoxysilane- 3 aminopropyl dimethyl ethoxysilane (APMS) is depicted for the first time. The two-step organophilization procedure, including dimethyl sulfoxide intercalation and APMS grafting onto the inner hydroxyl surface of kaolinite (the mineral) layers was tested for three sources of kaolin rocks (KR, KC and KD) with various morphologies and kaolinite compositions. The load of APMS in the kaolinite interlayer space was higher than that of 3-aminopropyl triethoxysilane (APTS) due to the single-point grafting nature of the organophilization reaction. A higher long-distance order of kaolinite layers with low staking was obtained for the APMS, due to a more controllable organiphilization reaction. Last but not least, the solid state (29)Si-NMR tests confirmed the single-point grafting mechanism of APMS, corroborating monodentate fixation on the kaolinite hydroxyl facets, with no contribution to the bidentate or tridentate fixation as observed for APTS.

References

Jul 14, 2006·Journal of Colloid and Interface Science·Sadok LetaiefChristian Detellier
Jun 21, 2007·Chemical Communications : Chem Comm·Sadok Letaief, Christian Detellier
May 16, 2008·Journal of Colloid and Interface Science·Tamer A Elbokl, Christian Detellier
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Mar 20, 2012·Journal of Colloid and Interface Science·Elisa MorettiMaurizio Lenarda
Apr 14, 2012·Physical Chemistry Chemical Physics : PCCP·Susmita Sen Gupta, Krishna G Bhattacharyya

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