共 25 条
Phase diagram of the C12E6/D2O system revisited:: Effect of strong magnetic fields
被引:21
作者:
Capitani, D
[1
]
Casieri, C
Briganti, G
La Mesa, C
Segre, AL
机构:
[1] CNR, NMR Serv, Area Ric Roma MB10, I-00016 Monterotondo, Italy
[2] Ist Strutturist Chim, I-00016 Monterotondo, Italy
[3] INFM, I-67100 Laquila, Italy
[4] Univ Aquila, Dept Phys, I-67100 Laquila, Italy
[5] Univ La Sapienza, Dept Phys, I-00185 Rome, Italy
[6] Univ La Sapienza, Dept Chem, I-00185 Rome, Italy
来源:
JOURNAL OF PHYSICAL CHEMISTRY B
|
1999年
/
103卷
/
29期
关键词:
D O I:
10.1021/jp990143b
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Lyotropic mixtures composed by heavy water and C12E6 (n-dodecylhexaoxyethylene glycol [CH3(CH2)(11)(OCH2CH2-CH2)(6)OH], with different mole ratios, W-0, have been studied in the presence of high magnetic fields. Depending on both thermal history and magnetic conditioning, a significant orientation of the samples is obtained and the phase boundaries are slightly modified with respect to the originally reported ones. The resulting H-2 spectra show the presence of two components, one iso-oriented and another one partially oriented. To quantify the amount of oriented spectral components a full simulation was performed, based on 0th, 2nd, and 4th rank Legendre polynomials. Experimental investigation is focused on the hexagonal mesophase, but information is also given on the lamellar phase. The iso-orientation of samples is kept for several months. The presence of a large amount of iso-oriented phases is confirmed by optical polarizing microscopy experiments.
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页码:6088 / 6095
页数:8
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