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000056608 084__ $$2WoS$$aChemistry, Physical
000056608 1001_ $$0P:(DE-Juel1)VDB3419$$aZhang, Z.$$b0$$uFZJ
000056608 245__ $$aSynthesis of poly(ethylene glycol) (PEG)-grafted colloidal silica particles with improved stability in aqueous solvents
000056608 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2007
000056608 300__ $$a446 - 455
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000056608 440_0 $$03193$$aJournal of Colloid and Interface Science$$v310$$x0021-9797
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000056608 520__ $$aThe known grafting procedures of colloidal silica particles with poly(ethylene glycol) (PEG) lead to grafting layers that detach from the silica surface and dissolve in water within a few days. We present a new grafting procedure of PEG onto silica with a significant improvement of the stability of the grafting layers in aqueous solvents. Moreover, the procedure avoids any dry states or other circumstances leading to strong aggregation of the particles. To achieve the improved water stability, Stöber silica particles are first pre-coated with a silane coupling agent (3-aminopropyl)triethoxysilane (APS) to incorporate active amine groups. The water solubility of the pre-coating layer was minimized using a combination of APS with bis-(trimethoxysilylpropyl)amine (BTMOSPA) or bis-(triethoxysilyl)ethane (BTEOSE). These pre-coated particles were then reacted with N-succinimidyl ester of mono-methoxy poly(ethylene glycol) carboxylic acid to form PEG-grafted silica particles. The particles form stable dispersions in aqueous solutions as well as several organic solvents.
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000056608 65320 $$2Author$$aPEG
000056608 65320 $$2Author$$agrafting
000056608 65320 $$2Author$$acolloidal silica
000056608 65320 $$2Author$$awater stability
000056608 65320 $$2Author$$abridged silanes
000056608 65320 $$2Author$$aSi-29 NMR
000056608 7001_ $$0P:(DE-Juel1)129438$$aBerns, A. E.$$b1$$uFZJ
000056608 7001_ $$0P:(DE-Juel1)133857$$aWillbold, S.$$b2$$uFZJ
000056608 7001_ $$0P:(DE-Juel1)130577$$aBuitenhuis, J.$$b3$$uFZJ
000056608 773__ $$0PERI:(DE-600)1469021-4$$a10.1016/j.jcis.2007.02.024$$gVol. 310, p. 446 - 455$$p446 - 455$$q310<446 - 455$$tJournal of colloid and interface science$$v310$$x0021-9797$$y2007
000056608 8567_ $$uhttp://dx.doi.org/10.1016/j.jcis.2007.02.024
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