Oscillating phase separation in microemulsions. I. Experimental observation

Vollmer, Doris; Strey, R.; Vollmer, J.

doi:10.1063/1.474719

Cited by 34 publications

(48 citation statements)

References 29 publications

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“…Many other important areas have bene"ted from nonlinear dynamical approaches. Others that o!er the prospect of reward in this way include the recent reports of oscillatory kinetics accompanying phase transitions in complex #uids (Vollmer, Strey & Vollmer, 1997) and in catalytic reactions under industrial operating conditions (Hadden, Sakakini, Tabatabaei & Waugh, 1997;Werner, Herein, Schultz, Wild & Schlogl, 1997).…”

Section: Discussionmentioning

confidence: 99%

Complex chemical reactions — A review

Scott

Johnson

Taylor

et al. 2000

Chemical Engineering Science

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Complex responses have been observed in a wide range of chemical and engineering systems: In well-stirred and unstirred solution-phase, in gels, in heterogeneous catalysis and dissolution reactions, in gas-and solid-phase combustion, widely in biological systems, accompanying phase transitions, in atmospheric kinetics and even in interstellar dust clouds. Complex behaviour does not, however, imply a necessarily complex underlying chemical mechanism. The appropriate feedback mechanisms, built on chainbranching, autocatalysis or self-heating, arise quite commonly in Nature. In many instances, it is appropriate "rst to attempt to "nd reduced mechanisms giving a semi-quantitative "t to observed responses. An example of such an approach applied to a model for complex oscillations of species concentrations in the mesosphere is presented, and the reduced model used to investigate the e!ects of longitudinal mixing in this system. Once a general understanding of a particular reaction system has been obtained, more detailed questions can be addressed. This is exempli"ed by a study of the development of three-dimensional scroll waves in the Belousov}Zhabotinsky reaction. Such detailed information for a speci"c reaction also informs the general understanding of the class of &excitable media'.

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Section: Discussionmentioning

confidence: 99%

Complex chemical reactions — A review

Scott

Johnson

Taylor

et al. 2000

Chemical Engineering Science

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“…For systems containing strong surfactants the interfacial models passed this test surprisingly well: For intermediate surfactant concentrations they provide an accurate description of significant regions of the phase diagrams, as well as of caloric effects related to crossing phase boundaries. Close to the emulsification boundary, where the droplets in a droplet-phase microemulsion start to shrink on expense of forming a coexisting phase containing predominantly the interior of the droplets, the simplest mean-field picture, i.e., a description that neglects all entropic corrections to the Helfrich energy, turned out to yield already an accurate description of thermodynamic properties and of the non-trivial (oscillatory) kinetics of phase separation under constant heating [20].…”

Section: Introductionmentioning

confidence: 98%

“…One of the important achievements was the modeling of static and dynamic properties of membrane and vesicle configurations [2], and of structural phase transitions in amphiphilic mixtures [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Early work (cf.…”

Section: Introductionmentioning

confidence: 99%

Bending free energy and spontaneous curvature for micelles and microemulsions with weak and strong surfactants

Vollmer

2001

The European Physical Journal E

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For mixtures of water, oil and non-ionic surfactant the temperature-induced phase separation of a droplet-phase microemulsion into a phase of smaller sized droplets coexisting with a water-or oilrich phase is studied by differential-scanning microcalorimetry. A comparison of theoretical estimates and experimental findings for specific-heat measurements on mixtures containing different types of surfactants (weak and strong) support a broad range of applicability of an interfacial modeling ("Helfrich free energy"), provided a more general expression for the spontaneous curvature of the interface is considered than suggested so far. The model provides then a quantitative interfacial description even for the strongly curved diffuse interface of micelles of weak surfactants.

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“…It has been shown that the choice of the microstructure sensitively depends on the composition of the samples, and on external control parameters, such as temperature, added salt, alcohol, or dye. For instance a gradual change of the temperature by less then 20°C can lead to a succession of more than four phase transitions between phases with strikingly different macroscopic properties [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%