By Jean-Michel Guenet

ISBN-10: 3319331760

ISBN-13: 9783319331768

ISBN-10: 3319331787

ISBN-13: 9783319331782

This ebook presents a physics-oriented advent to organogels with a comparability to polymer thermoreversible gels each time appropriate. The prior decade has noticeable the advance of a large choice of newly-synthesized molecules that could spontaneously self-assemble or crystallize from their natural or aqueous strategies to provide fibrillar networks, particularly organogels, with capability functions in natural electronics, mild harvesting, bio-imaging, non-linear optics, and so on. This compact quantity offers a close outlook of those novel molecular structures with targeted emphasis upon their thermodynamics, morphology, molecular constitution, and rheology. The definition of those advanced platforms can also be tackled, in addition to the position of the solvent. The textual content positive factors a variety of temperature-phase diagrams for quite a few organogels in addition to illustrations in their buildings on the microscopic, mesoscopic and macroscopic point. A evaluation of a few strength purposes is equipped together with hybrid sensible fabrics with polymers and with carbon nanotubes. all through, discussions of theoretical advancements and experimental advances are written at a degree compatible for starting graduate scholars via working towards researchers.

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Extra resources for Organogels: Thermodynamics, Structure, Solvent Role, and Properties

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6, 8] [010] plane of the crystalline lattice (related to the length of the central core + terminal groups), while they surmise that the third one may be the second order of the first reflection or may correspond to the [002] plane. 1 The Microscopic Structure 41 Fig. 5 TEM diffraction patterns obtained on xerogels from OPVR/benzyl alcohol (left), OPVOH/benzyl alcohol (middle), and OPVMe/benzyl alcohol (right). In OPVMe, the OH group is replaced by an OCH3 group. The straight lines stand for the fibril long axis.

This is expected as emphasized in Fig. 3. The total melting occurs in two steps: first disappearance of the infinite network, leaving finite aggregates, and then the gradual melting of the remaining aggregates. The DSC endotherm contains both, while rheology is only sensitive to the first step. Dasgupta et al. investigated OPV systems in different solvents in relation with the chemical structure of the OPV molecule, namely the nature of the terminal groups [15]. Their findings can illustrate the case where a molecular compound is possibly formed.

4. 1 40 4 Molecular Structure and Morphology Fig. 4 Â 10−2g/cm3. From Dasgupta et al. [8] Fig. 4 Top schematic representation of the molecular arrangement in OPVOH organogels as determined by Ajayaghosh and coworkers [5]. Rectangles stand for the “central core” and threads represent the aliphatic wings. Bottom the molecules as seen parallel to the central core; left OPVR molecules with a tilt angle of about a % 41°, right the OPVOH molecules standing upright, from Dasgupta et al. [6, 8] [010] plane of the crystalline lattice (related to the length of the central core + terminal groups), while they surmise that the third one may be the second order of the first reflection or may correspond to the [002] plane.

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Organogels: Thermodynamics, Structure, Solvent Role, and Properties by Jean-Michel Guenet

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