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Moisture adsorption by milk whey protein films (2002)

Yoshida, C. M. P. ; Antunes, A. C. B. ; Antunes, A. J.

Oxford UK : Blackwell Science Ltd.

International journal of food science & technology 37 (2002), S. 0

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ISSN: 1365-2621

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Process Engineering, Biotechnology, Nutrition Technology

Notes: Edible films, using whey protein as the structural matrix, were tested for water vapour diffusion properties. Whey protein films were prepared by dispersing 6.5% whey protein concentrate (WPC) in distilled water with pH kept at 7.0. Glycerol was the plasticizer agent. Film slabs (13.5 × 3.5 cm) were put in a chamber at 25 °C and 75% relative humidity, being held in vertical planes for different periods of time. The mass gain was determined throughout the experiment. We show that moisture adsorption by milk whey protein films is well described by a linear diffusion equation model. After an adsorption experiment was performed the solution of the diffusion equation was fitted to the data to determine the diffusion coefficient of the material.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1365-2621.2002.00585.x

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Effect of Ta2O5 doping on the electrical properties of 0.99SnO2·0.01CoO ceramic (2000)

Antunes, A. C. ; Antunes, S. M. ; Pianaro, S. A. ; [et al.]

Springer

Journal of materials science 35 (2000), S. 1453-1458

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ISSN: 1573-4803

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract The effect of Ta2O5 doping in 0.99SnO2·0.01CoO on the microstructure and electrical properties of this ceramic were analyzed in this study. The grain size was found to decrease from 6.87 μm to 5.68 μm when the Ta2O5 concentration increased from 0.050 to 0.075 mol%. DC electrical characterization showed a dramatic increase in the current loss and decrease in the non-linear coefficient with the increase of the Ta2O5 concentration. The conduction mechanism is by thermionic emission and the potential barriers are of Schottky type, separated by a thin film.