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Dive into the research topics where Laurent Germanaud is active.

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Featured researches published by Laurent Germanaud.


Colloid and Polymer Science | 1988

Micellar properties of zwitterionic phosphobetaine amphiphiles in aqueous solution: Influence of the intercharge distance

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

Mesomorphic structure of neutral amphiphilic phosphotobetaines having different interionic distances. II: Phenylphosphinatobetaines

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

Control of n-alkanes crystallization by ethylene-vinyl acetate copolymers.

Emmanuelle Marie; Yves Chevalier; Franck Eydoux; Laurent Germanaud; Philippe Flores


Archive | 2005

USE OF ADDITIVES TO IMPROVE THE ODOR OF HYDROCARBON COMPOSITIONS AND HYDROCARBON COMPOSITIONS COMPRISING SUCH ADDITIVES.

Laurent Germanaud; Franck Eydoux; Clarisse Doucet; Denis Fadel; Cécile Chambon; Christian Tremoliere; Jean-Paul Mercier


Journal of Colloid and Interface Science | 2004

Settling of paraffin crystals in cooled middle distillate fuels.

Emmanuelle Marie; Yves Chevalier; Sylvain Brunel; Franck Eydoux; Laurent Germanaud; Philippe Flores


Archive | 2000

Multifunctional additive compositions enabling middle distillates to be operable in cold conditions

Frank G Eydoux; Philippe Flores; Dominique Vichard; Laurent Germanaud


Macromolecular Chemistry and Physics | 1986

New polymeric phosphonato-, phosphinato- and carboxybetaïnes, 1. Syntheses and characterization by IR spectroscopy

Thierry Hamaide; Laurent Germanaud; Pierre Le Perchec


Archive | 1985

Surface-active compounds of the sulfobetaines family, their manufacture and use, particularly for enhanced oil recovery

S. Brunel; Laurent Germanaud; Pierre Le Perchec; Bernard Sillion


Archive | 2006

Lubricating Composition for Hydrocarbonated Mixtures and Products Obtained

Nathalie Boitout; Laurent Dalix; Clarisse Doucet; Laurent Germanaud


Archive | 2004

Olefin and alkenyl alkylate polymers and their use as multifunctional additive in fuels and gasoline

Frank G Eydoux; Laurent Germanaud; Emmanuelle Marie

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S. Brunel

Centre national de la recherche scientifique

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P. Le Perchec

Centre national de la recherche scientifique

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Pierre Le Perchec

Centre national de la recherche scientifique

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Bernard Gallot

Centre national de la recherche scientifique

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Thierry Hamaide

Centre national de la recherche scientifique

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