Peter Teasdale

Molecular recognition using conducting polymers: basis of an electrochemical sensing technology—Plenary lecture

Molecular recognition principles are being increasingly used as the basis for analytical technologies. The combination of a molecular recognition approach with conducting polymer materials has been beneficial, particularly in the field of electrochemical sensing. The electrochemical sensing process usually consists of two steps: analyte recognition and signal generation. Conducting polymers are versatile materials in which molecular/analyte recognition can be achieved in a number of different ways, including the incorporation of counter ions that introduce selective interactions, using the inherent and unusual ion-exchange properties of the conducting polymers; the addition of functional groups to the monomers; and the codeposition of metals within the polymer. Specific examples of these approaches are provided. The molecular recognition properties of conducting polymers can be further refined by the application of appropriate electrochemical potentials, which can induce either large or small changes in the chemical interactions that occur at the polymers. This electroactivity, as well as their conducting properties, also provides the basis for the signal generation steps. A number of electronic signals relating to some chemical or electrochemical change within the polymer can be measured. These include the faradaic electron transfer typically used for electrochemical sensing, the catalysis of the analytically useful electron transfer by the polymer or the analyte, the change in capacitance signals induced by the analyte species and changes in the polymer resistance which can be measured by a recently developed technique. These features, combined with the molecular recognition properties, make conducting polymers a very promising material for electrochemical sensing technology.

Conductive Electroactive Polymers : Intelligent Polymer Systems, Third Edition

Introducing a new hobby for other people may inspire them to join with you. Reading, as one of mutual hobby, is considered as the very easy hobby to do. But, many people are not interested in this hobby. Why? Boring is the reason of why. However, this feel actually can deal with the book and time of you reading. Yeah, one that we will refer to break the boredom in reading is choosing conductive electroactive polymers intelligent polymer systems 3rd edition as the reading material.

Pore water sampling with sediment peepers

Abstract The use of in situ equilibrium dialysis samplers (peepers) for the collection of sediment pore waters for trace metal analysis is reviewed. Optimum peeper designs, construction and preparation procedures are described. Field deployment and sampling protocols are outlined with their utility illustrated by dissolved metal profiles obtained from field studies.

Electrochemical chromatography —packings, hardware and mechanisms of interaction

Abstract The purpose of this review is to consider the development of the liquid chromatographic technique wherein the imposition of small electrical potentials are used to induce changes in retention, in order to effect a separation. The term electrochemical chromatography is proposed for this technique in keeping with the existing nomenclature. The available mechanisms of electrochemical control over the chromatographic behaviour are discussed with their dependency upon the type of packing material. Preparation of the stationary phases and column designs are also discussed. Recent progress using conducting polymers, such as polypyrrole, as modifiers for suitable supports is given, with the conclusion that these materials may provide the foundations for the development of electrochemical chromatography into a routine and useful analytical method.

In situ characterization of conducting polymers by measuring dynamic contact angles with Wilhelmy's plate technique

Abstract Dynamic contact angle analysis with Wilhelmys plate technique was found to be useful for characterizing the chemical interactions that occur on conducting polymers. The derivatized pyrroles, 3-carboxy-4-methylpyrrole and 3-carbethoxy-4-methylpyrrole, along with pyrrole, were used to prepare polymers with a range of polarities. The predicted trend of polarity, based upon the chemical structures of the polymers, was verified with the technique. It has also been shown that the substrate employed during electropolymerization process plays a major role in determining the properties of the resultant polymer.

Transport across stand-alone conducting polypyrrole membranes containing dodecylsulfate counterions

Abstract The modification of the electrodynamic transport properties of conducting polypyrrole membranes by the use of dodecylsulfate anions during polymerization has been demonstrated. The use of small amounts of the surfactant counterion in combination with paratoluene sulfonate as the predominant anion during polymerization allows the production of conductive, mechanically stable materials with differing chemical properties. This, in turn, influences the transport characteristics and has been found to induce asymmetric transport character in the membrane.