Colloidal stability of bare and polymer-grafted silica nanoparticles in ionic liquids

Langmuir : the ACS Journal of Surfaces and Colloids
Kazuhide UenoMasayoshi Watanabe

Abstract

The colloidal stability of bare and poly(methyl methacrylate) (PMMA)-grafted silica nanoparticles was studied in 1-alkyl-3-methylimidazolium ([C(n)mim])-based ionic liquids (ILs) with different anionic structures. The theoretical estimation of the colloidal interaction between monodispersed bare silica particles by using the Derjaguin-Landau-Verwey-Overbeek theory indicates that bare silica particles cannot be stabilized and they rapidly form aggregates in all the ILs used in this study. The instability of bare silica particles was experimentally confirmed by dynamic light scattering measurement and in situ transmission electron microscopy observations by utilizing the negligible vapor pressure of ILs. This evidence suggests that electrostatic stabilization is inefficient in ILs because of the high ionic atmosphere and the resulting surface-charge screening. The PMMA-grafted silica particles exhibited long-term colloidal stability in [C(4)mim][PF(6)] and [C(n)mim][NTf(2)], which are compatible with the grafted PMMA. On the other hand, the PMMA-grafted particles could not be stabilized in [C 4mim][BF 4] due to the poor solubility of the grafted PMMA in the IL. Effective steric stabilization is important for obtaining stable coll...Continue Reading

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Citations

Jan 6, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Kazuhide Ueno, Masayoshi Watanabe
Mar 23, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Keigo KinoshitaHiroshi Yanagimoto
Feb 11, 2010·Physical Chemistry Chemical Physics : PCCP·Kazuhide UenoMasayoshi Watanabe
Apr 10, 2010·Physical Chemistry Chemical Physics : PCCP·Kazuhide UenoKazue Kurihara
Mar 17, 2012·Physical Chemistry Chemical Physics : PCCP·Evert VanechtJan Fransaer
Jan 24, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Jacob SmithRob Atkin
Feb 27, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Kazuhide UenoMasayoshi Watanabe
Mar 13, 2014·Colloid and Polymer Science·Małgorzata WiśniewskaVladimir M Gun'ko
Apr 15, 2014·Physical Chemistry Chemical Physics : PCCP·Istvan SzilagyiMichal Borkovec
Jul 7, 2014·Journal of Colloid and Interface Science·J A SmithO Werzer
Oct 21, 2014·Chemical Communications : Chem Comm·Wei WangZhiqiang Cao
Dec 16, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Lang G Chen, Harry Bermudez
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Dec 17, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Kazuhide UenoMasayoshi Watanabe
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