Changes in aggregate form, size and flexibility along phase sequences in lyotropic liquid crystals

Amáral, L. Q.

doi:10.1590/s0103-97332002000300014

Cited by 13 publications

(3 citation statements)

References 24 publications

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“…There is experimental evidence for this anisotropic distribution of decanol in micelles . Amaral and co-workers − have investigated the effect of decanol on the micellar shape and on the micellar bending energy in order to explain the N C - N D phase transition in the sodium dodecyl sulfate/decanol/water system. These considerations can be extended to explain the formation of the intermediate biaxial mesophases.…”

Section: Resultsmentioning

confidence: 99%

Observation of Two Biaxial Nematic Mesophases in the Tetradecyltrimethylammonium Bromide/Decanol/Water System

2003

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The phase diagram of the nematic mesophases present in the tetradecyltrimethylammonuim bromide/ n-decanol/water system was determined. Two distinct biaxial nematic mesophases with opposite diamagnetic and optical anisotropies were identified using 2 H NMR spectroscopy and optical microscopy with polarized light. Two nematic biaxial phases were observed in a very narrow region between the two uniaxial nematic mesophases. The sequence of phase changes, hexagonal-calamitic N C-biaxial NBX + -biaxial NBX --discotic ND-lamellar mesophases, was observed with increasing decanol content. The phase transition between the two biaxial mesophases is first order, while the phase transitions between the NC and NBX + and the NBX --ND mesophases are second order. The order parameters of the ionic headgroup of the surfactant, determined from the 2 H quadrupolar splittings, indicate that the average micelle size decreases with the decanol content in the NC and NBX + mesophases and increases with the decanol content in the NBXand ND mesophases.

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Section: Resultsmentioning

confidence: 99%

Observation of Two Biaxial Nematic Mesophases in the Tetradecyltrimethylammonium Bromide/Decanol/Water System

2003

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“…Complex polymorphism of ternary systems, comprising an amphiphile /water/alcohol and/or salt has been extensively studied over the last two decades [20]. Since interfaces between polar and apolar groups of amphiphilic matters have a tendency to a spontaneous combination, there emerge numerous polymorphisms of various forms and symmetries [20].…”

Section: Introductionmentioning

confidence: 99%

“…Since interfaces between polar and apolar groups of amphiphilic matters have a tendency to a spontaneous combination, there emerge numerous polymorphisms of various forms and symmetries [20]. Hydrophilic interactions between hydrophobic and head groups on hydrocarbon-water interface are essential driving forces turning amphiphiles into groupings.…”

Section: Introductionmentioning

confidence: 99%

Nano-Structural Analysis of a Lyotropic Liquid Crystal (TTAB + water + decanol ternary) System by Salt (NH₄Br) Addition

Masalci

Kazancı

Orujalipoor

et al. 2015

Molecular Crystals and Liquid Crystals

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TurkeyIn the present study, the ionic effect of salt addition to a lyotropic liquid crystal (LLC) system was investigated. NH 4 Br salt was added to TTAB + water + decanol ternary system and the structural changes in lyotropic phases were characterized. First, phase transitions were illustrated by polarized microscope and secondary, small-angle xray scattering was used as an analytical method to determine the nano-structured mesophases of the newly prepared liquid crystal samples. The expected fibrous structures were characterized by the form factor of polydisperse oblate ellipsoids. The selfassembled networks related with these ellipsoids were also explained with hexagonal, distorted hexagonal, and lamellar formations.

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Lyotropic mesophase in amphiphile + aliphatic alcohol mixtures with additions of water: mesomorphic, thermomorphologic, and optical refracting properties

Nesrullajev

2017

Colloid Polym Sci

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Changes in aggregate form, size and flexibility along phase sequences in lyotropic liquid crystals

Cited by 13 publications

References 24 publications

Observation of Two Biaxial Nematic Mesophases in the Tetradecyltrimethylammonium Bromide/Decanol/Water System

Observation of Two Biaxial Nematic Mesophases in the Tetradecyltrimethylammonium Bromide/Decanol/Water System

Nano-Structural Analysis of a Lyotropic Liquid Crystal (TTAB + water + decanol ternary) System by Salt (NH₄Br) Addition

Lyotropic mesophase in amphiphile + aliphatic alcohol mixtures with additions of water: mesomorphic, thermomorphologic, and optical refracting properties

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Changes in aggregate form, size and flexibility along phase sequences in lyotropic liquid crystals

Cited by 13 publications

References 24 publications

Observation of Two Biaxial Nematic Mesophases in the Tetradecyltrimethylammonium Bromide/Decanol/Water System

Observation of Two Biaxial Nematic Mesophases in the Tetradecyltrimethylammonium Bromide/Decanol/Water System

Nano-Structural Analysis of a Lyotropic Liquid Crystal (TTAB + water + decanol ternary) System by Salt (NH4Br) Addition

Lyotropic mesophase in amphiphile + aliphatic alcohol mixtures with additions of water: mesomorphic, thermomorphologic, and optical refracting properties

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Product

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Nano-Structural Analysis of a Lyotropic Liquid Crystal (TTAB + water + decanol ternary) System by Salt (NH₄Br) Addition