Research output: Contribution to journal › Article › peer-review
H-1 and C-13 NMR investigation of conformational and aggregation behavior of sodium N-lauroyl sarcosinate. / Popova, Maria V.; Chernyshev, Yuriy S.; Michel, Dieter; Chizhik, Vladimir I.
In: Journal of Molecular Liquids, Vol. 280, 15.04.2019, p. 40-48.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - H-1 and C-13 NMR investigation of conformational and aggregation behavior of sodium N-lauroyl sarcosinate
AU - Popova, Maria V.
AU - Chernyshev, Yuriy S.
AU - Michel, Dieter
AU - Chizhik, Vladimir I.
PY - 2019/4/15
Y1 - 2019/4/15
N2 - Complementary experiments with NMR 1 H and 13 C spectroscopy, proton diffusometry, and relaxometry have been used to investigate the sodium N-lauroyl sarcosinate (SLS) micellar systems in aqueous solutions. The effects of concentration and temperature on molecular conformation, micellar structure, and molecular kinetic in the SLS solutions were studied. Each NMR spectral line of the SLS spectrum splits but there are two variants of the effect: (i) for the head-groups this effect exists in the whole concentration range and it is due to the presence of two conformational isomers, (ii) for the hydrophobic part the splitting of resonance lines is observed in certain concentration range and caused by the existence of two different realizations of micellar aggregates. The concentration of the cis-conformers is a bit higher in a “monomer” (diluted) solution as well as the trans-conformers are more favorable in the micellar state. The relation of cis- and trans-conformer fractions is nearly independent of temperature. The transient concentration range, where different types of micellar sub-structures co-exist, is discovered. Moreover, the SLS solutions are characterized by four kinetic processes with different time scale.
AB - Complementary experiments with NMR 1 H and 13 C spectroscopy, proton diffusometry, and relaxometry have been used to investigate the sodium N-lauroyl sarcosinate (SLS) micellar systems in aqueous solutions. The effects of concentration and temperature on molecular conformation, micellar structure, and molecular kinetic in the SLS solutions were studied. Each NMR spectral line of the SLS spectrum splits but there are two variants of the effect: (i) for the head-groups this effect exists in the whole concentration range and it is due to the presence of two conformational isomers, (ii) for the hydrophobic part the splitting of resonance lines is observed in certain concentration range and caused by the existence of two different realizations of micellar aggregates. The concentration of the cis-conformers is a bit higher in a “monomer” (diluted) solution as well as the trans-conformers are more favorable in the micellar state. The relation of cis- and trans-conformer fractions is nearly independent of temperature. The transient concentration range, where different types of micellar sub-structures co-exist, is discovered. Moreover, the SLS solutions are characterized by four kinetic processes with different time scale.
KW - AQUEOUS MICELLES
KW - SURFACTANTS
KW - MICELLIZATION
KW - AMPHIPHILES
KW - PHASE
KW - WATER
KW - BOND
KW - CIS
KW - MIXTURE
KW - BINDING
UR - http://www.scopus.com/inward/record.url?scp=85061435591&partnerID=8YFLogxK
U2 - 10.1016/j.molliq.2019.02.029
DO - 10.1016/j.molliq.2019.02.029
M3 - Article
AN - SCOPUS:85061435591
VL - 280
SP - 40
EP - 48
JO - Journal of Molecular Liquids
JF - Journal of Molecular Liquids
SN - 0167-7322
ER -
ID: 39224730