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Pregled bibliografske jedinice broj: 707981

Časopis

Autori: Tomašić, Vlasta; Mihelj, Tea; Zhang, Ruibin; Liu, Feng; Ungar, Goran
Naslov: Mesomorphism of a new series of catanionic 4-(1- pentylheptyl)benzenesulfonates
( Mesomorphism of a new series of catanionic 4-(1- pentylheptyl)benzenesulfonates )
Izvornik: Soft matter (1744-683X) 10 (2014); 7887-7896
Vrsta rada: članak
Ključne riječi: catanionic surfactant; thermotropic mesomorphism; small angle X-ray scattering; 4-(1-pentylheptyl)benzenesulfonate
( catanionic surfactant; thermotropic mesomorphism; small angle X-ray scattering; 4-(1-pentylheptyl)benzenesulfonate )
Sažetak:
The effect of cationic chemical structure on the mesophase behavior, and self-assembly of catanionic compounds is studied through a systematic structure variation of six cationic surfactants with anionic sodium 4-(1- pentylheptyl)benzenesulfonate surfactant. A series of cationic surfactants are selected with increasing number of n-dodecyl chains on the same ammonium headgroup (from one to three), and with increasing number of ammonium headgroups (from two to four). Thermal and phase behavior of the synthesized products were examined by thermogravimetry, polarizing microscopy, differential scanning calorimetry, powder and grazing incidence X-ray diffraction, and molecular simulation. The compounds are complexes of high thermal stability. Most of the thermotropic mesophases are smectic, although the hexagonal mesophase is also observed. Introduction of the third dodecyl chain into the cationic part causes pronounced lower melting temperatures and eradicates mesomorphism, while the addition of a fourth ammonium headgroup leads to a catanionic benzenesulfonate that decomposes simultaneously with melting. Melting and crystallization temperatures show nonlinear dependence on the total number of alkyl chains, and on the number of headgroups in the molecule. Molecular dynamics simulation of the smectic phase points to separated hydrophilic and hydrophobic layers, favoring head-to-head packing of antiparallel molecules. On the other hand, there are two ion pairs in the column cross- section of the hexagonal LC phase of didodecyldimethylammonium-4-(1- pentylheptyl)benzenesulfonate.
Projekt / tema: 098-0982915-2949
Izvorni jezik: eng
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
MEDLINE
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Kemija
URL Internet adrese: http://pubs.rsc.org/en/content/articlelanding/2014/sm/c4sm01356e#!divAbstract
Broj citata:
Altmetric:
DOI: 10.1039/C4SM01356E
URL cjelovitog teksta:
Google Scholar: Mesomorphism of a new series of catanionic 4-(1- pentylheptyl)benzenesulfonates
Upisao u CROSBI: Vlasta Tomašić (Vlasta.Tomasic@irb.hr), 28. Srp. 2014. u 10:31 sati



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