Journal
SOFT MATTER
Volume 6, Issue 3, Pages 635-640Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b914997j
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Funding
- Japan Society for the Promotion of Science [20750182, 18004]
- Royal Society Wolfson Research Merit Award
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Submicron-sized sterically-stabilized lightly cross-linked poly(2-vinylpyridine) latexes were synthesized by non-aqueous dispersion polymerization using a hydrophobic polydimethylsiloxane macromonomer and used to prepare millimetre-sized 'liquid marbles'. These 'liquid marbles' exhibited long-term stability when transferred onto the surface of liquid water provided that the solution pH was pH 4.9 or above. In contrast, the use of more acidic solutions (pH < 2.9) led to immediate 'liquid marble' disintegration and spontaneous dispersal of the poly(2-vinylpyridine) particles in their protonated microgel form. Moreover, the liquid marbles on the surface of water immediately disintegrated on addition of acid. Thus the critical minimum pH required for long-term 'liquid marble' stability correlates closely with the known pK(a) value of 4.7 for poly(2-vinylpyridine) chains.
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