Ionic liquid as electrolyte in a self-powered controlled release system

Abstract Initial studies into the development of a self-powered controlled release system using ionic liquid electrolyte were performed via galvanic coupling of a conducting polymer doped with dye and a zinc anode. The conducting polymer employed was polypyrrole (PPy) doped with phenol red (PR) dye. The electrochemical properties of the polymer as well as the dye release process initiated by a Zn electrode were investigated. A bilayer conducting polymer structure wherein polypyrrole–polystyrene sulfonate (PPy-PSS) coated on top of PPy-PR ensured no leakage of dye, yet allowed efficient release of PR on galvanic coupling in a temperature sensitive electrolyte.

[1]  G. Inzelt,et al.  Electron and proton conducting polymers: Recent developments and prospects , 2000 .

[2]  C. Brabec,et al.  Plastic Solar Cells , 2001 .

[3]  J. Roncali.  Conjugated poly(thiophenes): synthesis, functionalization, and applications , 1992 .

[4]  R. Baughman.  Conducting polymer artificial muscles , 1996 .

[5]  G. Wallace,et al.  Use of Ionic Liquids for π-Conjugated Polymer Electrochemical Devices , 2002, Science.

[6]  A. Hillman,et al.  In Situ Electron Spin Resonance Study of n‐ and p‐Doping of Polyterthiophene , 1995 .

[7]  M. Freund,et al.  A novel layer-by-layer approach for the fabrication of conducting polymer/RNA multilayer films for controlled release. , 2006, Langmuir : the ACS journal of surfaces and colloids.

[8]  Joachim Kohn,et al.  pH triggered release of protective poly(ethylene glycol)-b-polycation copolymers from liposomes. , 2006, Biomaterials.

[9]  T. Yeu,et al.  Electrochemical Characterization of Electronically Conductive Polypyrrole on Cyclic Voltammograms , 1991 .

[10]  C. K. Chiang,et al.  Electrical Conductivity in Doped Polyacetylene. , 1977 .

[11]  P. Novák,et al.  Electrochemically Active Polymers for Rechargeable Batteries. , 1997, Chemical reviews.

[12]  J. Roncali.  Synthetic Principles for Bandgap Control in Linear pi-Conjugated Systems. , 1997, Chemical reviews.

[13]  P. Christensen,et al.  Anion movement and carrier type in polypyrrole/dodecyl sulfate , 1993 .

[14]  Robin D. Rogers,et al.  Characterization and comparison of hydrophilic and hydrophobic room temperature ionic liquids incorporating the imidazolium cation , 2001 .

[15]  S. Sukhishvili,et al.  Hydrogen-Bonded Multilayers of Thermoresponsive Polymers , 2005 .

[16]  S. Yuk,et al.  Hydrogen-bonded polymer gel and its application as a temperature-sensitive drug delivery system. , 2004, Biomaterials.

[17]  Paul M. George,et al.  Electrically Controlled Drug Delivery from Biotin‐Doped Conductive Polypyrrole , 2006 .

[18]  Geoffrey M. Spinks,et al.  Conductive Electroactive Polymers: Intelligent Materials Systems , 1997 .

[19]  B. Adhikari,et al.  Polymers in sensor applications , 2004 .

[20]  D. Macfarlane,et al.  Ionic liquids based on imidazolium, ammonium and pyrrolidinium salts of the dicyanamide anion , 2002 .

[21]  J. Reynolds,et al.  Electrochemically Induced Charge and Mass Transport in Polypyrrole/ Poly(styrene Sulfonate) Molecular Composites , 1991 .

[22]  Gordon G. Wallace,et al.  The effect of the counterion on the electrochemical properties of conducting polymers — a study using resistometry , 1994 .

[23]  M. Akashi,et al.  Loading and release of charged dyes using ultrathin hydrogels. , 2005, Langmuir : the ACS journal of surfaces and colloids.

[24]  Philip G. Whitten,et al.  A galvanic cell driven controlled release system based on conducting polymers , 2008 .

[25]  Xinyan Tracy Cui,et al.  Electrochemically controlled release of dexamethasone from conducting polymer polypyrrole coated electrode. , 2006, Journal of controlled release : official journal of the Controlled Release Society.