Biomedical subjects
Publications and source records attributed to R A Dryfe.
Potentiometric investigations using pressed zeolite discs are reported. Potential measurements have been performed in non-aqueous solutions--this is the first report, to our knowledge, of potentiometric detection of ions in non-aqueous media with zeolite materials. Nernstian behaviour is also displayed in aqueous solutions for ions that are only able to penetrate a fraction of the internal volume of the zeolite employed.
The silicalite-modified water/organic interface represents a novel system, which is of potential utility for electroanalytical studies. As a means of investigating the analytical potential of this interface the facilitated transfer of various alkali and alkaline earth metal ions have been investigated using voltammetric methods. Additionally, the size selective transfer of tetraalkylammonium ions across this modified interface has been studied and a possible adsorption process that may be a step in the overall transfer has been identified.
The use of the scanning electrochemical microscope (SECM) to probe the kinetics of charge-transfer processes at bilayer lipid membranes (BLM) is presented. Analysis of the SECM tip response demonstrates that an unmodified BLM behaves as an insulator, whereas a BLM doped with iodine shows some positive feedback. The SECM technique thus allows one to probe processes at a BLM and determine the kinetics of the charge-transfer process. The SECM can also be used to determine the shape of the BLM.