A simple method for measuring water diffusion coefficients in conducting polymers

1994 ◽  
Author(s):  
P. Passiniemi
Keyword(s):  
Conducting Polymers ◽  
Diffusion Coefficients ◽  
Water Diffusion ◽  
Simple Method

scholarly journals Water diffusion in atmospherically relevant α-pinene secondary organic material

2015 ◽  
Vol 6 (8) ◽  
pp. 4876-4883 ◽  
Author(s):  
Hannah C. Price ◽  
Johan Mattsson ◽  
Yue Zhang ◽  
Allan K. Bertram ◽  
James F. Davies ◽  
...  
Keyword(s):  
Diffusion Coefficients ◽  
Organic Material ◽  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Water Diffusion ◽  
Direct Measurements ◽  
Atmospherically Relevant

We report the first direct measurements of water diffusion coefficients in secondary organic aerosol.

Water Absorption Characteristics of Obatanpa and Mamaba Maize Hybrids (Zea mays)

2006 ◽  
Vol 2 (3) ◽  
Author(s):  
Ahmad Addo ◽  
Ato Bart-Plange ◽  
Komla Dzisi
Keyword(s):  
Zea Mays ◽  
Diffusion Coefficient ◽  
Water Absorption ◽  
Diffusion Coefficients ◽  
Type Equation ◽  
Water Diffusion ◽  
Energy Of Activation ◽  
Absorption Kinetics ◽  
Maize Hybrids ◽  
Absorption Characteristics

Water absorption characteristics of two newly-released maize hybrids, Obatanpa and Mamaba, during soaking were measured at four temperatures of 30, 40, 50 and 60ºC. The absorption kinetics followed the Fick's law of diffusion during the first hours of soaking. The values determined for water diffusion coefficients varied from 7.31 x 10-12 to 9.33 x 10-12 m2/s and from 6.30 x 10-12 to 8.25 x 10-12 m2/s for Obatanpa and Mamaba respectively. An Arrhenius–type equation was used to relate the diffusion coefficient of Obatanpa and Mamaba to temperature, and the energy of activation for Obatanpa and Mamaba was estimated. The values determined were 6.54 kJ/mol and 6.82 kJ/mol for Obatanpa and Mamaba respectively.

Calculation of Surface Self-Diffusion Coefficients from AES Data on Decay of Thin Metal Films

2005 ◽  
Vol 237-240 ◽  
pp. 727-732 ◽  
Author(s):  
I. Beszeda ◽  
Dezső L. Beke ◽  
E.G. Gontier-Moya ◽  
Yuri S. Kaganovsky ◽  
D. Ianetz
Keyword(s):  
Thin Films ◽  
Diffusion Coefficients ◽  
Kinetic Data ◽  
Metal Films ◽  
In Situ Monitoring ◽  
Simple Method ◽  
Self Diffusion ◽  
Auger Signal ◽  
Equilibrium Calculations

We propose a simple method for calculation of surface self-diffusion coefficients using kinetic data on the decay of thin films – void growth and transformation of the island shape to the equilibrium. Calculations are made taking into account equilibrium wetting angle of the film on a substrate. The kinetic data on the decay of Pd thin films on sapphire and silica substrates were obtained using Auger electron spectroscopy. By in situ monitoring the intensity of the Auger signal from the film, three different stages of the decay could be distinguished. The surface self-diffusion coefficients were calculated for the temperature range 583 – 823 K. The values of the surface diffusion coefficients and the activation energies are discussed compared to those obtained by other methods.

scholarly journals Brain-water diffusion coefficients reflect the severity of inherited prion disease

Neurology ◽  
2010 ◽  
Vol 74 (8) ◽  
pp. 658-665 ◽  
Author(s):  
H. Hyare ◽  
S. Wroe ◽  
D. Siddique ◽  
T. Webb ◽  
N. C. Fox ◽  
...  
Keyword(s):  
Prion Disease ◽  
Diffusion Coefficients ◽  
Water Diffusion ◽  
Brain Water

Deconvolution of Compartmental Water Diffusion Coefficients in Yeast-Cell Suspensions Using Combined T1 and Diffusion Measurements

2002 ◽  
Vol 156 (1) ◽  
pp. 52-63 ◽  
Author(s):  
Matthew D. Silva ◽  
Karl G. Helmer ◽  
Jing-Huei Lee ◽  
Sam S. Han ◽  
Charles S. Springer ◽  
...  
Keyword(s):  
Yeast Cell ◽  
Diffusion Coefficients ◽  
Water Diffusion ◽  
Cell Suspensions ◽  
And Diffusion

Inverse analysis of the transient bound water diffusion in wood

Holzforschung ◽  
2005 ◽  
Vol 59 (1) ◽  
pp. 38-45 ◽  
Author(s):  
Wiesław Olek ◽  
Patrick Perré ◽  
Jerzy Weres
Keyword(s):  
Experimental Data ◽  
Diffusion Coefficients ◽  
Inverse Analysis ◽  
Bound Water ◽  
Water Diffusion ◽  
European Species ◽  
Alternative Approach ◽  
Transfer Problems ◽  
Bound Water Content ◽  
Water Diffusion Coefficient

Abstract The methods so far applied to determine the bound water diffusion coefficient in wood do not provide credible results on this coefficient as well as on the boundary condition. An alternative approach based on the concept of solving the inverse transfer problems was recently applied. Two European species were investigated in the present study. A series of sorption experiments was performed and followed by the numerical identification of the coefficients. Several case studies were carried out for the constant and bound water content dependent diffusion coefficients. The obtained results were validated by comparison to a set of experimental data.

Empirical Dissolution Rate Law for the Glass R7T7 Contacting Halite- and Silica-Saturated Brines

1991 ◽  
Vol 257 ◽  
Author(s):  
B. Grambow ◽  
W. Lutze ◽  
R. Müller
Keyword(s):  
Time Dependence ◽  
Dissolution Rate ◽  
Diffusion Coefficients ◽  
Water Diffusion ◽  
Square Root ◽  
Borosilicate Glasses ◽  
Rate Law ◽  
Apparent Diffusion Coefficients ◽  
Apparent Diffusion

ABSTRACTWe report on the time dependence of release of glass constituents during static dissolution experiments with the COGEMA glass R7T7 in saline MgCl2 and NaCl dominated solutions at temperatures between 110 and 190°C. The experiments were performed at high S/V values to ensure silica saturation almost from the start of the tests. The results show a square root of time dependence indicating diffusion as rate-controlling with apparent diffusion coefficients similar to that of water diffusion in alkali silicate, borosilicate glasses or long-term weathered obsidians.

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