Electrochemically controlled release of α, β, γ, δ-tetrakis(4-N-methylpyridyl)porphine from layer-by-layer thin films

Hiroshi Sato, Yoichi Takano, Katsuhiko Sato, Jun ichi Anzai

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The release of α, β, γ, δ-tetrakis(4-N-methylpyridyl)porphyrin (TMPyP) from layer-by-layer assembled thin films composed of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) was electrochemically controlled. The release rate of TMPyP was enhanced when a positive electrode potential (+1.2 to +1.5 V) was applied to the glassy carbon electrode on which TMPyP-loaded PAH/PAA film was coated, while the effect of lower electrode potentials (0 to +1.0 V) was negligibly small. The effect of applied potential on the release rate was more significant at pH 7.4 than in the solutions of pH 8.0 and 9.0. The electrochemically enhanced release of TMPyP was rationalized based on local pH change in the vicinity of the electrode surface, which was induced by electrolysis of H2O.

Original languageEnglish
Pages (from-to)141-144
Number of pages4
JournalJournal of Colloid And Interface Science
Volume333
Issue number1
DOIs
Publication statusPublished - 2009 May 1

Keywords

  • Controlled release
  • Electrode potential
  • Layer-by-layer film
  • Loading and release

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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