Synthesis of pH-Responsive Particles with Shape Anisotropy

Jiang, Tianying; Zukoski, Charles F.

doi:10.1021/la300376r

Synthesis of pH-Responsive Particles with Shape Anisotropy

Journal Article · Fri Mar 30 00:00:00 EDT 2012 · Langmuir

DOI:https://doi.org/10.1021/la300376r· OSTI ID:1876404

Jiang, Tianying ^[1]; Zukoski, Charles F. ^[2]

Univ. of Illinois at Urbana-Champaign, IL (United States); University of Illinois
Univ. of Illinois at Urbana-Champaign, IL (United States)

Seeded emulsion polymerization is used to produce large quantities of shape anisotropic, amphoteric particles in a size range of about 1 μm. Here, copolymer dicolloids (CDCs) containing pyridine groups are synthesized by swelling spherical, lightly cross-linked polystyrene seeds with a mixture of styrene and pH-responsive monomer 2-vinyl pyridine followed by secondary polymerization to contrast with their analogue homopolymer dicolloids (HDCs) where the swelling step is carried out with styrene alone. After the particles are coated with a nonionic surfactant to minimize van der Waals attractions, surface potentials and aggregation properties of dilute suspensions are studied as functions of pH and ionic strength. Compared to HDCs, which remain stable at all pH values studied (3 < pH < 9) up to an ionic strength of 5 M, the CDC particles show amphoteric behavior with strong attractions under conditions where dipolar interactions are expected to dominate.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: FG02-07ER46453; FG02-07ER46471

OSTI ID:: 1876404

Journal Information:: Langmuir, Journal Name: Langmuir Journal Issue: 17 Vol. 28; ISSN 0743-7463

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Ionic strength
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Polymer particles
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Synthesis of pH-Responsive Particles with Shape Anisotropy

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References (37)

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