Thermodynamic Study of Phase Transitions in Lyotropic Liquid Crystals:  Adiabatic Calorimetry on Nonionic Surfactant C12E6−Water System†

2001 ◽  
Vol 105 (15) ◽  
pp. 2987-2992 ◽  
Author(s):  
Makoto Nishizawa ◽  
Kazuya Saito ◽  
Michio Sorai
Keyword(s):  
Phase Transitions ◽  
Liquid Crystals ◽  
Nonionic Surfactant ◽  
Adiabatic Calorimetry ◽  
Water System ◽  
Lyotropic Liquid Crystals ◽  
Thermodynamic Study

Fabrication and Characterizes of TiO2 Nanomaterials Templated by Lyotropic Liquid Crystal

2011 ◽  
Vol 399-401 ◽  
pp. 532-537
Author(s):  
Li Hua Liu ◽  
Ying Bai ◽  
Fu Min Wang ◽  
Ning Liu
Keyword(s):  
Aqueous Solution ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nonionic Surfactant ◽  
Formation Mechanism ◽  
Lyotropic Liquid Crystals ◽  
Lyotropic Liquid Crystal ◽  
Micro Structure ◽  
Ft Ir ◽  
Rod Structures

TiO2 nanomaterials were synthesized in lyotropic liquid crystal formed by nonionic surfactant TritonX-100 and TiOSO4 aqueous solution with NH3•H2O as precipitator. The lyotropic liquid crystals were characterized by means of POM and Low-angle XRD. FT-IR, TGA, XRD, TEM were used to characterize the TiO2 samples. It was found that all the lytropic liquid crystal were in lamellar liquid crysal phase and after casting the micro-structure of the LLC phase, the TiO2 samples were self-assemble to form lamellar, sphere and rod structures. According to the characterization results, possible formation mechanism was proposed.

Direct Filament Formation of Biological Carbon Nanotube Suspensions

2012 ◽  
Vol 2012 (CICMT) ◽  
pp. 000132-000135
Author(s):  
Hiroya Abe ◽  
Zhenquan Tan ◽  
Akira Kondo ◽  
Makio Naito
Keyword(s):  
Carbon Nanotube ◽  
Liquid Crystals ◽  
Rheological Properties ◽  
Water System ◽  
Sodium Deoxycholate ◽  
Lyotropic Liquid Crystals ◽  
Shear Direction ◽  
Filament Formation ◽  
Self Association ◽  
Cnt Suspensions

In this study, aqueous carbon nanotube (CNT) suspensions were prepared using biological surfactant of sodium deoxycholate (NaDC). The influence of NaDC concentration on the NaDC self-association in water and the rheological responses of the NaDC-CNT-water system were investigated. It has been found that the yield stress of the suspension increased with NaDC concentration, which was strongly related to the NaDC self-association of lyotropic liquid crystals. Due to the enhanced rheological properties at high NaDC concentration (30%), it allowed the shear-induced filament formation in which the CNTs were aligned along to the shear direction. This filament formation may be attractive for transferring aligned CNTs on substrates in a controlled manner.

DETECTING PHASE EQUILIBRIA IN MODELS OF THERMOTROPIC AND LYOTROPIC LIQUID CRYSTALS

1993 ◽  
Vol 07 (04) ◽  
pp. 217-232 ◽  
Author(s):  
ZHENGPING ZHANG ◽  
OLE G. MOURITSEN ◽  
MARTIN J. ZUCKERMANN
Keyword(s):  
Phase Transitions ◽  
Liquid Crystals ◽  
Phase Equilibria ◽  
Lipid Bilayer ◽  
Finite Size ◽  
Lyotropic Liquid Crystals ◽  
Lyotropic Liquid Crystal ◽  
Simulation Techniques ◽  
Thermotropic Liquid Crystals ◽  
Computer Simulation Techniques

New ways are discussed of numerically detecting the nature of phase transitions and the position of phase equilibria in models of thermotropic and lyotropic liquid crystals where the phase transitions are dominated by strong fluctuations. The cases of continuous transitions (critical points), first-order transitions, as well as the absence of transitions, are considered. It is shown how computer-simulation techniques, which operate on a free-energy level by using reweighting (histogram) techniques in combination with finite-size scaling theory, provide an effective tool for unambiguously determining the nature of the transition and the position of associated phase equilibria. Three specific models are considered: the Lebwohl–Lasher model of the nematic–isotropic transition in thermotropic liquid crystals, the mismatch model of the main chain-melting phase transition in lipid-bilayer lyotropic liquid crystals, and a model for critical mixing in a lipid-bilayer lyotropic liquid crystal incorporated with trans-bilayer polypeptides.

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