Jean Charvolin

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The formation of toroidal aggregates by long chiral molecules of biological origin, as collagen, f-actin and DNA, or by chiral synthetic polypeptides has been observed in specific ionic environments. Such aggregates have received considerable attention in order to identify the various physical factors susceptible to contribute to this original(More)
Phyllotaxis, the search for the most homogeneous and dense organizations of small disks inside a large circular domain, was first developed to analyze arrangements of leaves or florets in plants. Then it has become an object of study not only in botany, but also in mathematics, computer simulations and physics. Although the mathematical solution is now well(More)
2014 Examination of deuteron magnetic resonance data in different thermotropic systems calls into question the explanation recently proposed by Bos and Doane wherein (i) the average molecular conformation does not change with temperature, even at phase transitions, and (ii) uniaxial and biaxial (Smc) mesophases are characterized by two and three molecular(More)
2014 We consider periodic organizations of two fluid media separated by interfaces in which interactions between the two media, normal to the interfaces, maintain constant distances between interfaces and constraints within each medium, parallel to the interfaces, control interfacial curvatures. The structures must therefore conciliate the constant(More)
2014 Light scattering studies have demonstrated the existence of a large scale periodic organization of the amphiphilic aggregates in magnetically oriented lyotropic nematic samples. This was first interpreted structurally, in terms of fluctuations of the concentration of the aggregates. The study described here rather suggest a textural interpretation, in(More)
Infinite periodic minimal surfaces are being now introduced to describe some complex structures with large cells, formed by inorganic and organic materials, which can be considered as crystals of surfaces or films. Among them are the spectacular cubic liquid crystalline structures built by amphiphilic molecules in presence of water. We study here the(More)
2014 The smectic F and I phases have been reported to be quasi-two dimensional systems. The SF phase was shown to be the first tilted version of the hexatic phase whereas the SI phase was shown to exhibit a 2D solid-like order. We have studied the terephtal-bis (4-n decylaniline) compound (TBDA) in which the SF phase surprisingly occurs at lower(More)