Effects of adsorption conformation on the dispersion of aluminum hydroxide particles by multifunctional polyelectrolytes

Ikuko Nishida, Yoshihiro Okaue, Takushi Yokoyama

Research output: Contribution to journalArticle

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Abstract

The influence of multifunctional polyelectrolytes on the dispersion of aluminum hydroxide particles was studied, in particular the influence of monomer units acting as functional groups, with respect to particle size and zeta potential. The conformation of polyelectrolytes adsorbed on aluminum hydroxide particles, which affects their dispersion abilities, was investigated via their adsorption isotherms and 1H NMR spectral analysis. Furthermore, the functions of monomer units were evaluated by the calculation of the interaction energies between each monomer unit and aluminum hydroxide or H2O by density functional theory. Three multifunctional polyelectrolytes were compared: a terpolymer of acrylic acid (AA), 2-acrylamide-2-methyl propane sulfonic acid (AMPS), and N-vinylpyrrolidone (NVP) (P(AA/SA/NVP)), acrylic acid homopolymer (P(AA)), and a copolymer of AA and AMPS (P(AA/SA)). The most effective dispersant was P(AA/ SA/NVP), which prevented further coagulation among the initial particles and shifted the zeta potential to the most negative value. The conformations of the adsorbed polyelectrolytes exhibited the following order of extended conformation (larger loops and longer tails): P(AA) > P(AA/SA/NVP) > P(AA/SA). From these results, we reasonably concluded that the prominent dispersing capability of P(AA/SA/NVP) was due to its preferred extended conformation on the particle surface due to a subtle balance between the moderate affinity of NVP and the relatively higher affinities ofAA and AMPS for aluminum hydroxide in an aqueous solution and the hydrophobicity of the amide groups of AMPS.

Original languageEnglish
Pages (from-to)11663-11669
Number of pages7
JournalLangmuir
Volume26
Issue number14
DOIs
Publication statusPublished - Jul 20 2010

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Aluminum Hydroxide
Hydrated alumina
acrylic acid
Polyelectrolytes
hydroxides
Conformations
aluminum
Acrylics
Adsorption
adsorption
Acids
Propane
Sulfonic Acids
Acrylamide
sulfonic acid
propane
monomers
Monomers
Zeta potential
affinity

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Effects of adsorption conformation on the dispersion of aluminum hydroxide particles by multifunctional polyelectrolytes. / Nishida, Ikuko; Okaue, Yoshihiro; Yokoyama, Takushi.

In: Langmuir, Vol. 26, No. 14, 20.07.2010, p. 11663-11669.

Research output: Contribution to journalArticle

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