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1.
2.
Soft matter, like colloidal suspensions and surfactant gels, exhibit strong response to modest external perturbations. This
paper reviews our recent experiments on the nonlinear flow behaviour of surfactant worm-like micellar gels. A rich dynamic
behaviour exhibiting regular, quasi-periodic, intermittency and chaos is observed. In particular, we have shown experimentally
that the route to chaos is via Type-II intermittency in shear thinning worm-like micellar solution of cetyltrimethylammonium
tosylate where the strength of flow-concentration coupling is tuned by the addition of sodium chloride. A Poincaré first return
map of the time series and the probability distribution of laminar length between burst events show that our data are consistent
with Type-II intermittency. The existence of a ‘Butterfly’ intensity pattern in small angle light scattering (SALS) measurements
performed simultaneously with the rheological measurements confirms the coupling of flow to concentration fluctuations in
the system under study. The scattered depolarised intensity in SALS, sensitive to orientational order fluctuations, shows
the same time-dependence (like intermittency) as that of shear stress. 相似文献
3.
4.
The cyclic voltammetric behaviour of Eu3+/Eu2+ couple at hanging mercury drop electrode (HMDE) has been studied in chloride, bromide, iodide, thiocyanate and EDTA supporting
electrolytes. The apparent rate constant and transfer coefficient for these systems have been calculated at various voltage
scan rates, without using the data for standard or formal potential. The values have been compared with those obtained by
earlier workers through other electrochemical methods. 相似文献
5.
R. Ganapathy 《Journal of Radioanalytical and Nuclear Chemistry》1978,43(1):131-138
The thermal neutron activation cross-section of94Zr was found to be 49.3±0.6 millibarns. It is shown that neutron activation analysis of Zr in silicate samples with a Zr/U
ratio<10 has considerable uncertainty due to fission contribution. A correction factor for the fission contribution has been
determined experimentally. 相似文献
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P. K. Chidambareswaran V. Sundaram B. B. Singh 《Journal of polymer science. Part A, Polymer chemistry》1972,10(9):2655-2660
The nature and behavior of free radicals induced in acetylated cotton celluloses irradiated with γ-rays have been studied by electron spin resonance (ESR) spectroscopy. Dehydrogenation and deacetylation appear to be responsible for the free radicals observed from samples irradiated at 77°K. The degree of substitution enhanced the yield of acetyl radicals when the samples were irradiated at 77°K and adversely affected the overall radical concentration when irradiation was done at 300°K. In addition, the ESR spectra of samples irradiated under vacuum at 300°K were more intense than those obtained from samples irradiated in air. The nature, yield, and post-irradiation behavior of the primary radicals are discussed in the light of the ultimate chemical effects observed. 相似文献