Results 251 to 260 of about 13,762 (298)

Interdiffusion in a polydisperse polymer blend

The Journal of Chemical Physics, 2004
We present a theoretical description of interdiffusion in a binary blend of polymers that exhibit polydispersity in length. The diffusion equations are formulated in terms of the volume fractions and the chain concentrations of the components. This choice of variables is equivalent to the assumption that the local molecular weight distributions of the ...
Victor V, Yashin, Anna C, Balazs
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Interdiffusion in Lead Selenide

Journal of Applied Physics, 1970
A theoretical model has been developed to explain the movement of a p-n junction in PbSe by the interdiffusion process. This model, which is a modification of an interdiffusion theory due to Brebrick, has one value for the diffusion coefficient in p-type material and another value in n-type material.
R. W. Brodersen, J. N. Walpole, A. R. Calawa   +2 more
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Nanoscale Effects in Interdiffusion

Defect and Diffusion Forum, 2007
Diffusion on the nano/atomic scales in multilayers, thin films has many challenging features even if the role of structural defects can be neglected and ‘only’ the effects related to the nano/atomic scale raise. Different examples for diffusional nanoscale effects we have discovered recently will be summarized in this paper.
Z. Erdélyi, G.A. Langer, A. Csik, D.L. Beke   +3 more
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Interdiffusion In Amorphous Multilayered Materials

Annual Review of Materials Research, 1987
Artificially layered materials made by thin film deposition are of particular interest, and become distinct from macroscopic composites, when the layer thicknesses approach atomic or molecular dimensions. Such materials are the subject of much current research because of their novel properties: elastic (1), electronic (2, 3), magnetic (4 ...
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Interdiffusion in Polymer Film by Ellipsometry

Journal of Colloid and Interface Science, 1999
The long-time approximation for the time-dependence concentration of solvent into film is derived. The interdiffusion coefficients for different temperatures and the different polystyrene molecular weights were calculated by using asymptotic formulae and time-dependence concentrations of solvent into polymer films.
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The interdiffusion of niobium and molybdenum

Journal of the Less Common Metals, 1966
Abstract The interdiffusion of niobium and molybdenum has been studied over the temperature range 1400°–2375°C. Values obtained for Q the activation energy for interdiffusion (95.4 kcal mole −1 ) and D 0 the frequency factor (1.5 cm 2 sec −1 ) are close to those previously reported for self-diffusion in niobium and molybdenum.
B.S. Wyatt, B.B. Argent
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Surface reactions and interdiffusion

Journal of Vacuum Science and Technology, 1979
Local interface chemistry is important to understand before proceeding to unravel the electronic properties of interfaces. Characterization of the intrinsic aspects of reactions and interdiffusion is also important to understand possible device size limitations.
R. Z. Bachrach, R. S. Bauer
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Interdiffusion of cadmium and nickel

Soviet Powder Metallurgy and Metal Ceramics, 1975
In an experimental investigation, the partial heterodiffusion coefficients of cadmium and nickel were determined for an annealing temperature of 270°C. It was established that the diffusion rate of cadmium markedly exceeds that of nickel. This difference accounts for the appearance of pores, inand an increase in volume of, compacts from mixed nickel ...
N. K. Terent'ev, Yu. M. Pozin, E. M. Ryzhkov, K. M. Solov'eva   +3 more
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The Effective Interdiffusion Coefficients in Experimental Investigations of Interdiffusion in Ternary Systems

Defect and Diffusion Forum, 2005
The application of the effective interdiffusion coefficients for describing the interdiffusion process in ternary systems is discussed. It is shown that the relative values of effective interdiffusion coefficients, which are directly related to the diffusion path developed in a given diffusion couple, are responsible for deviation of the diffusion ...
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INTERDIFFUSION IN THALLIUM AMALGAMS

Canadian Journal of Chemistry, 1963
The interdiffusion coefficient of thallium in thallium amalgams was measured by the capillary reservoir technique. At 25 °C the values of 105D in cm2 sec−1 at 0.00365, 0.0536, 0.0895, 0.148, 0.188, 0.283, 0.323, and 0.404 mole fraction thallium were 1.08,1.37,1.50,1.37,1.14,0.83, 0.95, and 1.11 respectively with standard deviations in 10−5(cm2 sec−1 ...
W. T. Foley, L. E. Reid
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