Artificial Muscles: A Tool To Quantify Exchanged Solvent during Biomimetic Reactions

作者：Otero Toribio F^*; Martinez Jose G

来源：Chemistry of Materials, 2012, 24(21): 4093-4099.

DOI：10.1021/cm302847r

• artificial muscle
• reaction
• solvent exchange
• apparent solvation number
• apparent hydration number

Artificial muscles (bending or linear) from films of conducting polymers are faradic and biomimetic gel motors consuming the same charge to move through the same space in a specific electrolyte. The driven volume variation of the film requires the exchange with the electrolyte of a number of counterions, defined by the charge, and solvent molecules during reactions. Working in aqueous solution with different anions using bilayer (polypyrrole/tape) bending artificial muscles, the charge consumed to describe a constant angle changes with the anion. Volume variations in the polypyrrole film due to the anionic exchange are calculated from the involved charge and the crystallographic radius of every anion. A parallel exchange of water molecules is required to explain the described angles. The number of solvent molecules exchanged between the polymeric membrane and the electrolyte at the same time that an anion (apparent solvation number) or when an electron was extracted from the chains (apparent hydration number) during the reaction was calculated. The use of artificial muscles (bending or linear) as a tool for the quantification of the number of solvent molecules accompanying the electrochemical reactions in p-doping n-doping conducting polymers is proposed.

• 出版日期2012-11-13