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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.50A [2011] >
IJC-A Vol.50A(05) [May 2011] >
| Title: | Phase behaviour and rheological properties of the lamellar liquid crystals formed in dodecyl polyoxyethylene polyoxypropylene ether/water system |
| Authors: | Zhao, J
Wang, Z N
Wei, X L
Liu, F
Zhou, W
Tang, X L
Wu, T H |
| Keywords: | Solution chemistry
Liquid crystals
Phase behaviour
Rheological properties
Lamellar liquid crystals
Dodecyl polyoxyethylene polyoxypropylene ether |
| Issue Date: | May-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The temperature-composition phase
diagram of the binary nonionic surfactant dodecyl polyoxyethylene polyoxy-propylene
ether/water system has been determined from 10 ºC to 70 ºC. Two domains of
lamellar liquid crystal phase are found in the binary system as the
concentration of the nonionic surfactant increases. The phase boundary of the
lamellar phase in the phase diagram has been identified by differential thermal
analysis. The steady and dynamic rheological properties of the lamellar liquid
crystals have been studied. Steady shear rheology results indicate that the
lamellar liquid crystals show shear-thinning behavior, and behave as a plastic
system with the m parameter between
0.6 and 0.7 in the
empirical equation. s
= sHB + Kgm. Dynamic
rheological results show that the lamellar phase exhibits a typical gel-like
rheogram. With increase in surfactant content, the dynamic modulus increases,
while with increases in temperature, the dynamic modulus decreases. |
| Page(s): | 641-649 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.50A(05) [May 2011]
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