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Titolo:
Conformation of methylene chains in an intercalated surfactant bilayer
Autore:
Venkataraman, NV; Vasudevan, S;
Indirizzi:
Indian Inst Sci, Dept Inorgan & Phys Chem, Bangalore 560012, Karnataka, India Indian Inst Sci Bangalore Karnataka India 560012 560012, Karnataka, India
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 9, volume: 105, anno: 2001,
pagine: 1805 - 1812
SICI:
1520-6106(20010308)105:9<1805:COMCIA>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
SODIUM DODECYL-SULFATE; NORMAL-ALKYL CHAINS; H STRETCHING MODES; LAYERED SILICATES; N-ALKANES; MNPS3; FTIR; LONG; TEMPERATURE; ADSORPTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Vasudevan, S Indian Inst Sci, Dept Inorgan & Phys Chem, Bangalore 560012, Karnataka, India Indian Inst Sci Bangalore Karnataka India 560012 taka, India
Citazione:
N.V. Venkataraman e S. Vasudevan, "Conformation of methylene chains in an intercalated surfactant bilayer", J PHYS CH B, 105(9), 2001, pp. 1805-1812

Abstract

Infrared and Raman spectroscopy have been used to establish the conformation and orientation of the methylene "tail" of cetyl trimethylammonium ions intercalated in an inorganic layered host, CdPS3. Intercalation, effected by a two-step ion-exchange process leading to the formation of Cd0.83PS3(CTA)(0.34), occurs With a lattice dilation of 26.5 Angstrom with the surfactant ions within the galleries adopting a bilayer structure. The frequencies of the conformationally sensitive methylene stretching modes in the infraredand Raman spectra indicate that a majority of the bonds in the methylene chain are in a trans conformation. The methylene chains are tilted with respect to the inorganic layer. The rift angle as determined from orientation-dependent infrared spectra is similar to 35 degrees. Although the populationof gauche conformers is low, it has been possible to identify specific conformational sequences containing a gauche bond, in the interior and terminiof the intercalated methylene chains, by their characteristic frequencies in the infrared spectrum. These high-energy conformers, except for the onesat the chain end, disappear on cooling, leaving on average all 15 methylene units of the intercalated cetyl trimethylammonium ion in trans conformational registry at 40 K. The terminal gauche defects are significant in preventing interdigitation of the low-density intercalated surfactant bilayer.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 14:17:49