Electrical response characteristics of two kinds of membrane were studied; one membrane is composed of poly vinyl chloride (PVC) with dioctyl phenylphosphonate (DOPP) as a plasticizer, and the other is a membrane used as the transducer part of a multichannel taste sensor, which contains PVC, DOPP and a negatively charged lipid. These two membranes exhibited unusual behavior, namely, that the membrane electric potentials did not become saturated with increasing NaCl concentration. The electric potential tends to saturate in conventional polymer membranes. The PVC/DOPP membrane was found to respond to NaCl more sensitively than the lipid/PVC/DOPP membrane. Good quantitative agreement with the observed data was obtained using a theory in which the surface electric potential and the diffusion potential within the membrane are both taken into account. It was shown that the lipid/PVC/DOPP membrane changes from the weakly charged state to the fully charged state by dissociation of H+ from the lipid with increasing NaCl concentration.
|Number of pages||12|
|Journal||Sensors and Materials|
|Publication status||Published - 1997|
All Science Journal Classification (ASJC) codes
- Materials Science(all)