Gelled Lyotropic Liquid Crystals

Xu, Yuanyuan; Laupheimer, Michaela; Preisig, Natalie; Sottmann, Thomas; Schmidt, Claudia

doi:10.1021/acs.langmuir.5b01992

Cited by 31 publications

(27 citation statements)

References 54 publications

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“…Gelled lyotropic liquid crystals can also be obtained by adding an appropriate LMG to al yotropic liquid crystal. [43] This study was carried out with the system used for the investigation of the gelled bicontinuous microemulsion since lyotropic liquid crystals were observed at higher surfactant concentrations in this system. Thep hase boundaries of the non-gelled and the gelled lyotropic LCs were determined visually and by 2 HNMR spectroscopy,a nd it was found that the general pattern of the phase diagram is not altered if one adds the gelator.…”

Section: Gelled Lyotropic Liquid Crystalsmentioning

confidence: 99%

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Gelled Complex Fluids: Combining Unique Structures with Mechanical Stability

Stubenrauch

Gießelmann

2016

Angew Chem Int Ed

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Gelled complex fluids are soft materials in which the microstructure of the complex fluid is combined with the mechanical stability of a gel. To obtain a gelled complex fluid one either adds a gelator to a complex fluid or replaces the solvent in a gel by a complex fluid. The most prominent example of a "natural" gelled complex fluid is the cell. There are various strategies by which one can form a gelled complex fluid; one such strategy is orthogonal self-assembly, that is, the independent but simultaneous formation of two coexisting self-assembled structures within one system. The aim of this Review is to describe the structure and potential applications of various man-made gelled complex fluids and to clarify whether or not the respective system is formed by orthogonal self-assembly.

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Section: Gelled Lyotropic Liquid Crystalsmentioning

confidence: 99%

“…Gelled lyotropic liquid crystals can also be obtained by adding an appropriate LMG to a lyotropic liquid crystal . This study was carried out with the system used for the investigation of the gelled bicontinuous microemulsion since lyotropic liquid crystals were observed at higher surfactant concentrations in this system.…”

Section: Gelled Complex Fluidsmentioning

confidence: 99%

Gelled Complex Fluids: Combining Unique Structures with Mechanical Stability

Stubenrauch

Gießelmann

2016

Angew Chem Int Ed

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“…Gelierte lyotrope Flüssigkristalle können ebenfalls gewonnen werden, indem man zu einem lyotropen Flüssigkristall einen geeigneten niedermolekularen Gelator hinzufügt . Diese Studie wurde mit dem System durchgeführt, das auch für die Untersuchung der gelierten bikontinuierlichen Mikroemulsion verwendet wurde, weil bei höheren Tensidkonzentrationen in diesem System lyotrope Flüssigkristalle beobachtet wurden.…”

Section: Gelierte Komplexe Fluideunclassified

Gelierte komplexe Fluide – die Verbindung einzigartiger Strukturen mit mechanischer Stabilität

Gießelmann

2016

Angewandte Chemie

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Gelierte komplexe Fluide sind weiche Materialien, in denen die Mikrostruktur des komplexen Fluids mit der mechanischen Stabilität eines Gels verbunden wird. Um ein geliertes komplexes Fluid zu erhalten, fügt man entweder einen Gelator zu einem komplexen Fluid hinzu, oder man ersetzt das in einem Gel enthaltene Lösungsmittel durch ein komplexes Fluid. Das bekannteste Beispiel eines “natürlichen” gelierten komplexen Fluids ist die Zelle. Es gibt verschiedene Strategien, mit denen man ein geliertes komplexes Fluid herstellen kann; eine dieser Strategien ist die orthogonale Selbstorganisation, also die unabhängige, aber gleichzeitige Bildung von zwei koexistierenden, selbstorganisierten Strukturen innerhalb eines Systems. Der vorliegende Aufsatz zielt darauf ab, die Struktur sowie potenzielle Anwendungen verschiedener gelierter komplexer Fluide zu beschreiben und abzuklären, ob das entsprechende System durch orthogonale Selbstorganisation entsteht.

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“…Another approach, the physicochemical approach, utilizes the solubilization function of the surfactants and does not depend on the specific chemical properties of the gelators. A bicontinuous microemulsion (BME) and lamellar liquid crystal (L α ) phase formed by a water/surfactant/oil system can solubilize 12-HOA at high temperature, and the gels are obtained by cooling [22][23][24][25][26][27][28]. In this case, the afforded gel is not purely a hydrogel because it contains micro-oil domains of BME or L α .…”

Section: Introductionmentioning

confidence: 99%

Effect of the Cationic Head Group on Cationic Surfactant-Based Surfactant Mediated Gelation (SMG)

Aramaki

Takimoto

Yamaguchi

2020

IJMS

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The surfactant-mediated gelation (SMG) method allows us to formulate hydrogels using a water-insoluble organogelator. In this study, we formulated hydrogels using three cationic surfactants, hexadecyltrimethylammonium bromide (CTAB), hexadecyltrimethylammonium chloride (CTAC), and hexadecylpyridinium chloride (CPC)] and an organogelator (12-hydroxyoctadecanoic acid (12-HOA), and studied their structures and mechanical properties. A fiber-like structure similar to that found in the 12-HOA-based organogels was observed by optical microscopy. Small- and wide-angle X-ray scattering profiles showed Bragg peaks derived from the long- and short-spacing of the crystalline structures in the gel fibers and a correlation peak from the surfactant micelles in the small-angle region. Furthermore, the formation of micelles in the hydrogels was confirmed by UV-vis spectroscopic measurements of the gel samples in the presence of Rhodamine 6G. We concluded that the hydrogels prepared by the SMG method in the present systems are orthogonal molecular assembled systems in which two different molecular assembled structures coexist. Among the three surfactant systems, the CTAB system presented the lowest critical gelation concentration and highest sol-gel transition temperature and viscoelasticity. These differences in gel fiber formation and gel properties were discussed from the viewpoint of the degree of solubilization of the gelator molecules in micelles coexisting with gel fibers and diffusion of the gelator molecules in the gel formation process.

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Gelled Lyotropic Liquid Crystals

Cited by 31 publications

References 54 publications

Gelled Complex Fluids: Combining Unique Structures with Mechanical Stability

Gelled Complex Fluids: Combining Unique Structures with Mechanical Stability

Gelierte komplexe Fluide – die Verbindung einzigartiger Strukturen mit mechanischer Stabilität

Effect of the Cationic Head Group on Cationic Surfactant-Based Surfactant Mediated Gelation (SMG)

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