Phase transitions of liquid-crystal films on an air-water interface

Xue, Jiangeng; Jung, Cheolsoo; Kim, Mahn Won

doi:10.1103/physrevlett.69.474

Cited by 189 publications

(182 citation statements)

References 13 publications

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“…As the more expanded initial phase is compressed, an increasing proportion of the more compressed phase appears. The first-order transition coexistence plateau has been observed between two monolayer phases [15] and between a monolayer and its collapsed threedimensional structure [16].…”

Section: Entropy Of the Reversible Collapse Transitionmentioning

confidence: 95%

Reversible collapse of the Langmuir films of a series of triphenylsilyl ether-terminated amphiphiles

et al. 2011

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Section: Entropy Of the Reversible Collapse Transitionmentioning

confidence: 95%

Reversible collapse of the Langmuir films of a series of triphenylsilyl ether-terminated amphiphiles

et al. 2011

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“…This point is evident if we express the volume of individual structures as a series expansion (11) where β p are constant coefficients and m is a positive real number. For the case of progressive nucleation, where I is constant, the integral in the exponential term of eq 8 gives (12) At small times, where higher-order terms can be ignored, n = m + 1 > 1, resulting in accelerating rates of collapse.…”

Section: Rates Of Nucleationmentioning

confidence: 99%

“…[9][10][11][12][13][14][15][16][17][18] Binary mixtures of dipalmitoyl phosphatidylcholine (DPPC) with dihydrocholesterol (dchol) form homogeneous films for which the liquid-crystalline collapse through a locus of constant size is particularly well documented. Microscopic images show that the collapse of 30% dchol/DPPC films initially forms bilayer disks on top of the monolayer.…”

Section: Introductionmentioning

confidence: 99%

Kinetics for the Collapse of Trilayer Liquid-Crystalline Disks from a Monolayer at an Air−Water Interface

2005

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Unlike surfactants considered in previous studies, when phosphatidylcholine (PC) monolayers collapse at constant surface tension to form a 3D bulk phase, surface area decreases at rates that slow. The different kinetics could result from collapse by a distinct mechanism. Rather than the transfer of molecules all along the interface between the monolayer and bulk phase, PC films can collapse by the folding and subsequent sliding of a bilayer over the monolayer. By this mechanism, molecules can transfer to collapsed trilayers through a locus of constant size. In this article, we use the theory of nucleation and growth to show analytically that during collapse, the area can decrease at rates that decelerate when each individual structure grows through a region of fixed dimensions. We also show that binary films of 30% dihydrocholesterol (dchol) and dipalmitoyl phosphatidylcholine (DPPC), which have previously been shown to form a homogeneous monolayer from which trilayer disks grow through a point, collapse with rates of area decay that slow, in agreement with our analytical expressions.

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“…Following Xue et al [5], we can distinguished three regions in the measured region of A presented in Figure 2. In region I, where A is larger than 0.48 nm 2 , coexistence of gas and liquid exists and π is constant and near by zero.…”

Section: Resultsmentioning

confidence: 99%

Molecular Organization in Langmuir Films of Dichroic Azo DyeLiquid Crystal Mixtures. II. Surface Potential Measurements

Martyński

Biadasz

Bauman

2003

Zeitschrift Für Naturforschung A

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Two-component films of 4-octyl-4'-cyanobifenyl (8CB) and non-amphiphilic azo dye (1) at different molar fractions were studied at the air-water interface on the basis of the surface potentialmean molecular area dependence recorded simultaneously with the surface pressure-mean molecular area isotherm. Conventional Langmuir technique was used to form 1/8CB (guest-host) films during reduction and expansion of an area occupied by the molecules. From the surface potential value the effective dipole moment in the first monolayer formed on the water was calculated. Moreover, the number of dipole moments directed to the air with respect to those directed towards the water was estimated. A model of the microscopic polar ordering of the molecules in 1/8CB films at the air-water interface is proposed.

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Phase transitions of liquid-crystal films on an air-water interface

Cited by 189 publications

References 13 publications

Reversible collapse of the Langmuir films of a series of triphenylsilyl ether-terminated amphiphiles

Reversible collapse of the Langmuir films of a series of triphenylsilyl ether-terminated amphiphiles

Kinetics for the Collapse of Trilayer Liquid-Crystalline Disks from a Monolayer at an Air−Water Interface

Molecular Organization in Langmuir Films of Dichroic Azo DyeLiquid Crystal Mixtures. II. Surface Potential Measurements

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