TY - JOUR
T1 - Lyotropic liquid crystalline phases from symmetric double-tailed surfactants
T2 - Sodium 1'-(6)-undecylbenzenesulfonate, 1'-(7)- tridecylbenzenesulfonate, and 1'-(8)pentadecylbenzenesulfonate in water
AU - Jalšenjak, Nenad
AU - Mesić, Milan
AU - Mihalić, Zlatko
AU - Pavešić, Nasta
AU - Pracaić, Suzana
AU - Težak, Durdica
AU - Platz, Gerhard
AU - Peukert, Susane
AU - Ulbricht, Werner
AU - Danino, Dganit
AU - Talmon, Yeshayahu
N1 - Funding Information:
We thank the Bayerischer Staatsministerium für Unterricht, Kultus, Wis-senschaft und Kunst, München, Germany, and the Ministry of Science and Technology of the Republic of Croatia for financial support.
PY - 1998/12/1
Y1 - 1998/12/1
N2 - Phase diagrams of binary symmetric double-tailed alkylbenzenesulfonate surfactant/water systems, as well as the structure of the phases, were determined using crossed polars, polarized light microscopy, 2H NMR spectroscopy, Nomarski differential interference contrast optics, and cryo- transmission electron microscopy. The isotropic phase, the lamellar phase, and a high-viscosity solution representing an intermediate between the isotropic phase and the mesophase, which refers to the beginning of the formation of vesicles, were found. As may be expected, the isotropic phases at higher concentrations are formed mostly at higher temperatures. Isotropic regions are followed by regions characterized as the isotropic solutions containing vesicles; the optically isotropic phase contains a lamellar dispersion of vesicles in solution. The viscosity of these phases is found to be high near the borderline of the two-phase regions. At the same concentrations two-phase regions were found to contain the isotropic + lamellar phases at the higher temperature and the isotropic + crystalline phase at the lower temperature. Molecular-mechanical and semiempirical quantum-mechanical calculation searches for the global minimum in the conformational space of alkylbenzenesulfonate ions were conducted to examine the influence of monomer molecular structure on the miceliar shape.
AB - Phase diagrams of binary symmetric double-tailed alkylbenzenesulfonate surfactant/water systems, as well as the structure of the phases, were determined using crossed polars, polarized light microscopy, 2H NMR spectroscopy, Nomarski differential interference contrast optics, and cryo- transmission electron microscopy. The isotropic phase, the lamellar phase, and a high-viscosity solution representing an intermediate between the isotropic phase and the mesophase, which refers to the beginning of the formation of vesicles, were found. As may be expected, the isotropic phases at higher concentrations are formed mostly at higher temperatures. Isotropic regions are followed by regions characterized as the isotropic solutions containing vesicles; the optically isotropic phase contains a lamellar dispersion of vesicles in solution. The viscosity of these phases is found to be high near the borderline of the two-phase regions. At the same concentrations two-phase regions were found to contain the isotropic + lamellar phases at the higher temperature and the isotropic + crystalline phase at the lower temperature. Molecular-mechanical and semiempirical quantum-mechanical calculation searches for the global minimum in the conformational space of alkylbenzenesulfonate ions were conducted to examine the influence of monomer molecular structure on the miceliar shape.
KW - Cryo-TEM
KW - Flat lamellar phase
KW - Nomarski optics
KW - Vesicles
UR - http://www.scopus.com/inward/record.url?scp=0344404219&partnerID=8YFLogxK
U2 - 10.1006/jcis.1998.5755
DO - 10.1006/jcis.1998.5755
M3 - 文章
AN - SCOPUS:0344404219
SN - 0021-9797
VL - 208
SP - 129
EP - 136
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
IS - 1
ER -