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Titolo:
Isooriented lyotropic lamellar phase in the C12E6/D2O system
Autore:
Briganti, G; Segre, AL; Capitani, D; Casieri, C; La Mesa, C;
Indirizzi:
CNR, Ist Struttist Chim MB 10, I-00016 Monterotondo, Italy CNR Monterotondo Italy I-00016 t Chim MB 10, I-00016 Monterotondo, Italy Univ Rome La Sapienza, Dept Phys, I-00185 Rome, Italy Univ Rome La Sapienza Rome Italy I-00185 Dept Phys, I-00185 Rome, Italy Univ Aquila, Dept Phys, I-67100 Laquila, Italy Univ Aquila Laquila ItalyI-67100 ila, Dept Phys, I-67100 Laquila, Italy Univ Rome La Sapienza, Dept Chem, I-00185 Rome, Italy Univ Rome La Sapienza Rome Italy I-00185 Dept Chem, I-00185 Rome, Italy
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 5, volume: 103, anno: 1999,
pagine: 825 - 830
SICI:
1520-6106(19990204)103:5<825:ILLPIT>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIQUID-CRYSTALS; MAGNETIC-FIELD; WATER-SYSTEM; BEHAVIOR; NMR; SURFACTANTS; TRANSFORMATIONS; SPECTROSCOPY; AMPHIPHILES; SCATTERING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Capitani, D CNR, Ist Struttist Chim MB 10, I-00016 Monterotondo, Italy CNR Monterotondo Italy I-00016 , I-00016 Monterotondo, Italy
Citazione:
G. Briganti et al., "Isooriented lyotropic lamellar phase in the C12E6/D2O system", J PHYS CH B, 103(5), 1999, pp. 825-830

Abstract

Aqueous solutions of a nonionic surfactant, n-dodecylhexaoxyethylene glycol [C12H25 (OCH2CH2)(6) OH], termed C12E6, have been studied in the mole ratio range W-0 = 5.6-14.9, where W-0 = [D2O]/[C12E6]. There, below a given temperature, a smectic lamellar phase exists. As shown by H-1 and H-2 NMR spectra, cooling induces the isotropic phase to become an almost completely isooriented lamellar phase when the magnetic field strength is high (14.1 T). In presence of high magnetic fields, the phase diagram is slightly different with respect to the originally reported one, and the coexistence of an isotropic phase and of the isooriented lamellar one can be observed. In a wide temperature range, only the isooriented lamellar phase is present; it isstable out of the magnetic field for several months. A careful study of the H-2 Splitting as a function of temperature and concentration indicates the onset of fluctuating cylinder inside the lamellar phase and defines theironset and region of existence. Optical polarizing microscopy experiments confirm the above observation, showing the occurrence of fine grained, mosaic optical textures.

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Documento generato il 28/09/20 alle ore 15:17:50