Physicochemical properties and esterolytic reactivity of oxime functionalized surfactants in pH-responsive mixed micellar system
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62690094%3A18470%2F17%3A50013379" target="_blank" >RIV/62690094:18470/17:50013379 - isvavai.cz</a>
Alternative codes found
RIV/00179906:_____/17:10360888
Result on the web
<a href="http://www.sciencedirect.com/science/article/pii/S0927775717303722?via%3Dihub" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0927775717303722?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.colsurfa.2017.04.039" target="_blank" >10.1016/j.colsurfa.2017.04.039</a>
Alternative languages
Result language
angličtina
Original language name
Physicochemical properties and esterolytic reactivity of oxime functionalized surfactants in pH-responsive mixed micellar system
Original language description
We present comprehensive study of the aggregation properties of zwitterionic micelles of oxime-functionalized surfactants and their mixed micellar systems with conventional cationic CTABr and nonionic Tween (R) 80 surfactants.Analysis of the micellar effects on the reaction rates toward activated esters is also completed. Specifically, aggregation properties of micelles of amphiphilic 1-alkyl-3-methyl-2-(oximinomethypimidazolium and 1-alkyl-3(1-oximinoethyl)pyridinum bromides (alkyl = CnH2n+1,where n = 12, 16) and their mixed micellar systems with CTABr and Tween (R) 80 have been investigated.The changes in micellar properties and reaction rates toward 4-nitrophenyl esters of diethyl phosphoric (NPDEP),diethyl phosphonic (NPDEPN),and toluenesulphonic (NPOTos) acids,with increase of pH ensuring deprotonation of specific oximate moiety,have been studied.We focused on the changes of micellar properties of mixed micelles depending on the mixture composition and the deprotonation degree of the functional oximate group.The critical micelle concentration (cmc) values,degrees of counterion binding (beta),and size of micellar aggregates were obtained using surface tension measurements,dynamic light scattering method, bromide selective electrode, and by solubilization of hydrophobic dye Orange OT.The surface excess concentration (T-max, mu mol/m(2)),minimum area per molecule (A(min)),interaction parameters (beta(m)),standard Gibbs free energy of adsorption (Delta G(ads)(o)) and micellization (Delta G(m)(o)) and excess free energy of micellization (Delta G(ex)) have been evaluated.Micellar effects of the systems studied on the acyl transfer reaction rates were shown to increase with higher fraction of deprotonated oxime and can be treated in the framework of a pseudophase partitioning model.These results provide new information on (i) control the reactivity of the organized molecular systems and (ii) elaboration the basis for designing pH responsive supramolecular assemblies.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
30104 - Pharmacology and pharmacy
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Colloids and surfaces a-physicochemical and engineering aspects
ISSN
0927-7757
e-ISSN
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Volume of the periodical
524
Issue of the periodical within the volume
July
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
17
Pages from-to
143-159
UT code for WoS article
000404311400016
EID of the result in the Scopus database
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