Laurent Germanaud
Centre national de la recherche scientifique
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Featured researches published by Laurent Germanaud.
Colloid and Polymer Science | 1988
Yves Chevalier; Laurent Germanaud; P. Le Perchec
Zwitterionic amphiphiles of the general formula H(CH2)y+ N(CH3)2(CH2)n PO2C6H5−, where the number of intercharge methylenesn is varied, were studied in dilute aqueous solution. Their critical micellar concentrations show a peculiar variation withn, first increasing asn varies from 1 to 4 and then slowly decreasing as methylenes are added up to 10. This behavior is interpreted as being the consequence of two opposite contributions. The first is the classical CMC lowering due to the increase of hydrophobic character with the total number of methylene groups in the surfactant molecule. The second contribution is the increase in the dipole moment of the zwitterionic headgroup withn, leading to stronger dipole-dipole repulsions between headgroups at the micellar surface. Experimental results suggest that the dipole moment does not increase linearly withn because of the polymethylene chain flexibility. This is supported by13C NMR relaxation experiments.
Journal of Colloid and Interface Science | 1988
Bernard Gallot; Laurent Germanaud; Yves Chevalier; P. Le Perchec
Abstract A set of amphiphilic phenylphosphinatobetaines having different interionic distances and two lengths of paraffinic chain were studies by X-ray diffraction. It has been shown that phenylphosphobetaines behave as lyotropic liquid crystals and exhibit, in concentrated water solutions, mesophases with a hexagonal structure. The respective influences of the water concentration, the interionic distance, and the length of the paraffinic chain on the geometrical structure parameters have been established. The structural behavior of the phenylphosphobetaines is compared to that of ethoxyphosphobetaines; it shows the influence of the organic substituent bound to the phosphorus atom.
Journal of Colloid and Interface Science | 2005
Emmanuelle Marie; Yves Chevalier; Franck Eydoux; Laurent Germanaud; Philippe Flores
Archive | 2005
Laurent Germanaud; Franck Eydoux; Clarisse Doucet; Denis Fadel; Cécile Chambon; Christian Tremoliere; Jean-Paul Mercier
Journal of Colloid and Interface Science | 2004
Emmanuelle Marie; Yves Chevalier; Sylvain Brunel; Franck Eydoux; Laurent Germanaud; Philippe Flores
Archive | 2000
Frank G Eydoux; Philippe Flores; Dominique Vichard; Laurent Germanaud
Macromolecular Chemistry and Physics | 1986
Thierry Hamaide; Laurent Germanaud; Pierre Le Perchec
Archive | 1985
S. Brunel; Laurent Germanaud; Pierre Le Perchec; Bernard Sillion
Archive | 2006
Nathalie Boitout; Laurent Dalix; Clarisse Doucet; Laurent Germanaud
Archive | 2004
Frank G Eydoux; Laurent Germanaud; Emmanuelle Marie