Interaction forces between a poly (N-isopropylacryamide) layer grafted onto a solid surface and a hydrophobic particle

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Abstract

The interaction forces between poly (N-isopropylacrylamide) (PNIPAAm)-grafted surfaces and colloidal particles in an aqueous solution were investigated using atomic force microscopy. The measurements were conducted between a smooth silicon wafer on which PNIPAAm was terminally grafted and silica particles hydrophobized with a silanating reagent in an aqueous electrolyte solution under controlled temperature. Large repulsive forces were observed between the surfaces below the lower critical solution temperature (LCST) of PNIPAAm, while attractive forces were observed above the LCST. The magnitude of the attractive force tended to increase with the surface hydrophobicity of the particles. The temperature-induced changes in the hydration state of the grafted PNIPAAm chains are considered to greatly alter the interaction force properties. The role of the intermolecular interaction between the PNIPAAm chains and hydrophobic particles in the interaction forces is discussed.

Original languageEnglish
Pages (from-to)631-642
Number of pages12
JournalAdvanced Powder Technology
Volume18
Issue number6
DOIs
Publication statusPublished - Nov 1 2007
Externally publishedYes

Keywords

  • Atomic force microscopy
  • Colloidal particle
  • Graft
  • Hydrophobic interaction
  • Interaction force
  • N-isopropylacrylamide
  • Thermoresponsive polymers

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanics of Materials

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