Low Frequency Dielectric Dispersion of Microporous Membranes in Electrolyte Solution

✍ Scribed by Ørjan G. Martinsen; Sverre Grimnes; Jan Karlsen

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 102 KB
• Volume: 199
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1997.5331

✦ Synopsis

a capacitive admittance component when measuring on

The electrical properties of microporous membranes in 1 mM charged microporous membranes in a four-electrode cell. KCl solution have been in vestigated in the frequency range 1 This paper focuses on the detection of such lateral double mHz to 1 kHz, using a four-electrode measuring cell. An alphalayer polarization in microporous polycarbonate membranes, dispersion centred around 0.1 Hz was detected and this was aswhereas the possible correlation to human sweat ducts is a sumed to be caused by counterion relaxation effects in the pores topic for further investigation.

of the membrane. Schwarz theory was used to provide a rough estimate on the results to be expected from the measurements.

II. THEORY This study is part of a project of which the objective is to reveal the contribution from the electrical properties of the sweat ducts to the total electrical properties of the epidermal stratum corneum.

Takashima (5) deduces the expression for the dielectric

Although the phase angles measured on the membranes were small increment of a suspension of long cylinders by transforming (õ2.9Њ), more data are needed before any conclusions regarding the relations for ellipsoids from rectangular to cylindrical human skin can be drawn.