Solvent dynamics in a reverse micellar water-pool: a spectroscopic investigation of DDAB–cyclohexane–water systems

2013 ◽  
Vol 15 (3) ◽  
pp. 930-939 ◽  
Author(s):  
Animesh Patra ◽  
Trung Quan Luong ◽  
Rajib Kumar Mitra ◽  
Martina Havenith
Keyword(s):  
Spectroscopic Investigation ◽  
Water Systems ◽  
Water Pool ◽  
Solvent Dynamics ◽  
Reverse Micellar

scholarly journals Kinetic Study of SN2 Reaction between Paranitrophenyl Benzoate and Hydrazine in the Presence of CTAB Reverse Micelles

2021 ◽  
Vol 16 (4) ◽  
pp. 744-751
Author(s):  
K. Bhargavi ◽  
P. Shyamala ◽  
M. Padma ◽  
K. V. Nagalakshmi
Keyword(s):  
Open Access ◽  
Kinetic Study ◽  
Reverse Micelles ◽  
Cetyltrimethylammonium Bromide ◽  
Micellar Medium ◽  
Water Pool ◽  
First Order ◽  
First Order Kinetics ◽  
Open Access Article ◽  
Reverse Micellar

Kinetic study of the reaction between p-Nitrophenyl benzoate (PNPB) by hydrazine (HYN) in the presence of Cetyltrimethylammonium bromide (CTAB)/Chloroform/Hexane reverse micellar medium shows that the reaction obeys first order kinetics with respect to each of the reactants. The rate of the reaction is much slower in reverse micellar medium compared to aqueous medium under identical conditions (kˈAq = 2.84×10−3 sec−1, krm =1.34×10−4 sec−1). The rate constants for the reaction in the reverse micellar medium have been determined at different values of W {W=[H2O]/[CTAB]} and at different concentrations of CTAB. It was found that the observed rate constant decreases with W. This kinetic behaviour was interpreted by using modified Berezin pseudo phase model, taking into consideration the distribution of the reactants, PNPB and hydrazine between the three pseudo phases, i.e., water pool, interface an organic phase. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

Compact polar moieties induce lipid–water systems to form discontinuous reverse micellar phase

Soft Matter ◽  
2015 ◽  
Vol 11 (27) ◽  
pp. 5417-5424 ◽  
Author(s):  
Manoj Kumar ◽  
Naganath G. Patil ◽  
Chandan Kumar Choudhury ◽  
Sudip Roy ◽  
Ashootosh V. Ambade ◽  
...  
Keyword(s):  
Water Systems ◽  
Micellar Phase ◽  
Micellar Morphology ◽  
Reverse Micellar

Macromolecules with a compact architecture and, that strongly interact with the lipid headgroup trigger an unusual pathway to the formation of a discontinuous AB2 micellar morphology.

Wastewater free supply in animal husbandry

2021 ◽  
pp. 25-30
Author(s):  
O. R. Ilyasov ◽  
S. N. Koshelev ◽  
A. M. Asonov ◽  
M. N. Kostomakhin
Keyword(s):  
Waste Water ◽  
Water Supply ◽  
Animal Species ◽  
Animal Husbandry ◽  
Water Systems ◽  
Household Waste ◽  
Water Pool ◽  
Closed Water ◽  
Main Component ◽  
Breeding Farms

The main component of waste water of livestock enterprises is the urine of cattle and pigs. The chemical composition of urine is determined by diet and animal species and can not be changed under any techniques. Analysis of water balances allows to make the conclusion that the termination of the reset of highly concentrated waste water by recycling in hydroponicum opens up the prospect of the creation of undrained water supply in animal breeding farms. The use of household waste water for the purposes of technical water supply will allow dramatically reduce the withdrawal of fresh water from a natural water pool, and discharge into it of waste water. Implementation of complex of measures on rational use of water in livestock enterprises allows to move from the closed water systems of individual plants (production of green feed by hydroponic method) to undrained water supply enterprises at all.

scholarly journals CTAB Reverse Micelles as Catalysts for the Oxidation of Ascorbic Acid by K3[Fe(CN)6]

2022 ◽  
Vol 17 (1) ◽  
pp. 157-162
Author(s):  
K. Bhargavi ◽  
P. Shyamala ◽  
P S S Chakravarthi ◽  
K V Nagalakshmi
Keyword(s):  
Ascorbic Acid ◽  
Reverse Micelles ◽  
Cetyltrimethylammonium Bromide ◽  
Water Pool ◽  
First Order ◽  
Micellar Systems ◽  
Lower Dielectric Constant ◽  
Open Access Article ◽  
Reverse Micellar Systems ◽  
Reverse Micellar

The oxidation of ascorbic acid by K3[Fe(CN)6] was studied in reverse micellar systems composed of CTAB (Cetyltrimethylammonium bromide), and it was found  the observed first order  (k1(aq) = 5.2×10−5 s−1, k1(rev) = 61.4×10−4 s−1) rate constant in reverse micellar medium is around forty times higher compared to aqueous medium under identical conditions. The rate enhancement (k2(aq) = 0.9×10−5 mole−1.dm3.sec−1, k2(rev) = 1.75×10−3 mole−1.dm3.sec−1)  is attributed to the large concentration effect and lower dielectric constant in the reverse micelles. The rate of the reaction increases with increase in W = {[H2O]/[surfactant]} which is explained in terms of ionic strength of the water pool. The effect of surfactant concentration on rate was explained on the basis of Berezin pseudo phase model. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

Some Results of the Spectroscopic Study of Four Close Binary Systems of Early Spectral Types

1965 ◽  
Vol 5 ◽  
pp. 120-130
Author(s):  
T. S. Galkina
Keyword(s):  
Spectroscopic Study ◽  
Spectral Type ◽  
Spectroscopic Investigation ◽  
Binary Systems ◽  
Quantitative Information ◽  
Close Binary ◽  
Physical Parameters ◽  
Absorption And Emission ◽  
Close Binary Systems ◽  
Quantitative Estimates

It is necessary to have quantitative estimates of the intensity of lines (both absorption and emission) to obtain the physical parameters of the atmosphere of components.Some years ago at the Crimean observatory we began the spectroscopic investigation of close binary systems of the early spectral type with components WR, Of, O, B to try and obtain more quantitative information from the study of the spectra of the components.

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