Electrical modeling of membrane hydration and movement of protective gloves in conductive solution.
Zeng-S; Beard-RB; Berardinelli-SP
J Clin Eng 1996 Nov; 21(6):456-465
An electrical circuit model of protective barrier membranes used to isolate a glove wearer from a surrounding conductive solution has been developed as a 12-loop equivalent circuit. The total effective parallel conductance (G) and capacitance (C) of a latex or nitrile glove, donned and then immersed in a conductive solution or body fluid is represented by 22 conductance-capacitance elements. This circuit simulates the frequency dependency of the G and C, and the nonlinear relationships between G and C and membrane interfacial area. Results from this circuit model illustrate that the frequency dependence is attributable to the multiple-impedance layers formed by glove membrane hydration, and the nonlinear relationships of the G and C to interfacial area caused by the wet outer glove membrane surface. The frequency dependency and the nonlinear relationships seriously affect the accuracy and sensitivity of electrical glove testers using the G, conductance rate dG/dt, or quality factor Q as the penetration indicator. Some necessary considerations for the designs of these three types of glove testers are suggested.
Electrical-properties; Gloves; Testing-equipment; Nitriles; Protective-materials; Protective-clothing
Shengke Zeng, NIOSH/DSR, 1095 Willowdale Rd., Morgantown, WV 26505
Journal of Clinical Engineering