Self-diffusion and tracer diffusion in styrene/2-vinylpyridine block copolymer melts

1994 ◽  
Vol 27 (20) ◽  
pp. 5591-5598 ◽  
Author(s):  
C. E. Eastman ◽  
T. P. Lodge
Keyword(s):  
Block Copolymer ◽  
Tracer Diffusion ◽  
Self Diffusion ◽  
Copolymer Melts

A density functional theory of chiral block copolymer melts

2013 ◽  
Vol 138 (19) ◽  
pp. 194901 ◽  
Author(s):  
Shih-Hao Wang ◽  
Toshihiro Kawakatsu ◽  
Peilong Chen ◽  
Chun-Yi David Lu
Keyword(s):  
Density Functional Theory ◽  
Block Copolymer ◽  
Density Functional ◽  
Functional Theory ◽  
Copolymer Melts

Complex Spherical Micelles in A−B−C-Block Copolymer Melts

1997 ◽  
Vol 30 (7) ◽  
pp. 1980-1991 ◽  
Author(s):  
E. E. Dormidontova ◽  
A. R. Khokhlov
Keyword(s):  
Block Copolymer ◽  
Copolymer Melts ◽  
Spherical Micelles

Self-diffusion of Ag+ and Na+ in molten Ca(NO3)2-KNO3

1972 ◽  
Vol 25 (8) ◽  
pp. 1613 ◽  
Author(s):  
BJ Welch ◽  
CA Angell
Keyword(s):  
Electrical Conductance ◽  
Ionic Species ◽  
Tracer Diffusion ◽  
Dilute Solution ◽  
Self Diffusion ◽  
Capillary Method ◽  
Arrhenius Temperature Dependence ◽  
Radio Tracer ◽  
Tracer Diffusion Coefficients ◽  
Arrhenius Temperature

In order to explore the behaviour of diffusing ionic species in a molten salt in which non-Arrhenius behaviour of other transport properties is established, the diffusivities in dilute solution of Ag+ and Na+ in 38.1 mol% Ca(NO3)2+ 61.9 mol% KNO3 have been measured. For both ions limited radio-tracer diffusion coefficients, determined using a diffusion-out-of-capillary method, are reported. D(Ag+) has also been measured by chronopotentiometry, by which means the range and reliability of the measurements were considerably extended. Chronopotentiometric and tracer data agree within expected errors of measurement. Both ionic diffusivities show a non-Arrhenius temperature dependence which is indistinguishable in magnitude from that of the electrical conductance of the solvent melt.

scholarly journals Structure and Dynamics of Ionic Block Copolymer Melts: Computational Study

2017 ◽  
Vol 50 (18) ◽  
pp. 7388-7398 ◽  
Author(s):  
Dipak Aryal ◽  
Anupriya Agrawal ◽  
Dvora Perahia ◽  
Gary S. Grest
Keyword(s):  
Block Copolymer ◽  
Computational Study ◽  
Structure And Dynamics ◽  
Copolymer Melts

Discovery of a Frank-Kasper   Phase in Sphere-Forming Block Copolymer Melts

Science ◽  
2010 ◽  
Vol 330 (6002) ◽  
pp. 349-353 ◽  
Author(s):  
S. Lee ◽  
M. J. Bluemle ◽  
F. S. Bates
Keyword(s):  
Block Copolymer ◽  
Copolymer Melts

Lithium tracer diffusion in near stoichiometric LiNi0.5Mn1.5O4 cathode material for lithium-ion batteries

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Daniel Uxa ◽  
Harald Schmidt
Keyword(s):  
Cathode Material ◽  
Secondary Ion Mass Spectrometry ◽  
Lithium Ion ◽  
Tracer Diffusion ◽  
Side Reactions ◽  
Battery Materials ◽  
Self Diffusion ◽  
Thermally Activated ◽  
Average Grain Size ◽  
And Migration

Abstract The compound LiNi0.5Mn1.5O4 is used as novel cathode material for Li-ion batteries and represents a variant to replace conventional LiMn2O4. For a further improvement of battery materials it is necessary to understand kinetic processes at and in electrodes and the underlying diffusion of lithium that directly influences charging/discharging times, maximum capacities, and possible side reactions. In the present study Li tracer self-diffusion is investigated in polycrystalline sintered bulk samples of near stoichiometric LiNi0.5Mn1.5O4 with an average grain size of about 50–70 nm in the temperature range between 250 and 600 °C. For analysis, stable 6Li tracers are used in combination with secondary ion mass spectrometry (SIMS). The tracer diffusivities can be described by the Arrhenius law with an activation enthalpy of (0.97 ± 0.05) eV, which is interpreted as the sum of the formation and migration energy of a thermally activated Li vacancy.

Rheology of Phase Separated Block Copolymer Melts

1989 ◽  
Vol 177 ◽  
Author(s):  
H. Henning Winter ◽  
Faith A. Morrison
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Single Crystals ◽  
Domain Structure ◽  
Shear Direction ◽  
Cylindrical Domain ◽  
Global Order ◽  
Copolymer Melts ◽  
Cylindrical Domains ◽  
Hexagonally Ordered

Flow can transfer the microphase separated morphology of block copolymers into a state of global order. For tri-block copolymers with cylindrical domains, this has been demonstrated by Folkes et al. (1973) and Hadziioannou et al. (1979). who established the existence of ‘single crystals’ of hexagonally ordered cylinders with uniform director throughout a sheared sample. The director is aligned with the shear direction. In this study, we investigate the flow induced ordering of cylindrical domain structure at increasing levels of shear.

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