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DIELECTRIC PROPERTIES of BENTONITE PASTES AS A FUNCTION of TEMPERATURE
Author(s) -
TONG C.H.,
LENTZ R.R.
Publication year - 1993
Publication title -
journal of food processing and preservation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.511
H-Index - 48
eISSN - 1745-4549
pISSN - 0145-8892
DOI - 10.1111/j.1745-4549.1993.tb00230.x
Subject(s) - bentonite , dielectric , materials science , loss factor , water content , composite material , dielectric loss , moisture , dielectric heating , conductivity , penetration depth , mineralogy , chemistry , optics , geotechnical engineering , optoelectronics , geology , physics
Dielectric properties [dielectric constant (ε′) and loss factor (ε″)] of 8% and 10% (w/v) bentonite pastes at 2450 MHz were measured from ‐ 25C to 90C by the cavity perturbation technique. the dielectric constant decreased as moisture content decreased and temperature increased (temperature ≤ OC). the relationships between loss factor, moisture content, and temperature were not straightforward due to the ionic loss (d.c. conductivity). Because of the similarities between bentonite pastes and most food materials in dielectric constant, loss factor, and penetration depth, bentonite pastes can be good model food systems to study microwave heating.