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ATTENTION !!! SEMINAIRE ANNULE !!! How Neutrons Help Us Design the Green Surfactant Technology of Tomorrow

Jeudi 30 novembre 2017 10:00 - Duree : 1 heure
Lieu : Seminar Room 7/8 - ILL 1, 71 avenue des Martyrs, Grenoble

Orateur : Stefan ULVENLUND (Enza Biotech AB and Lund University, Sweden)

Alkyl polyglycosides (APGs) are sugar-based non-ionic surfactants in which a hydrophobic fatty alcohol residue is linked to a glucose-based hydrophilic head-group via a glycoside bond. Since the 1990s, APGs have continuously grown in importance as emulsifiers, dispersants and detergents in manifold applications, particularly such that require a high degree of biocompatibility. However, conventional organic synthesis (Fischer glycosylation) only allows for production of APG surfactants with short head-groups consisting of one or two glucose units. This limitation severely hampers the full exploitation of APGs and makes them far less versatile than conventional non-ionic surfactants based on polyethyleneglycol (PEG ; for instance the polysorbate family of surfactants). Enza Biotech AB is a Swedish company (recently acquired by Croda International) that has developed enzymatic methods by which the head-groups of APGs can be extended in a controlled manner, opening up vast new opportunities. Over the course of the development work (initiated in 2003), light-, X-ray and neutron scattering have been important tools in the characterisation of the novel sugar-based surfactants in aqueous solution. The work shows that the properties of sugar-based surfactants can not, in the general case, be extrapolated from those of PEG-based ones, and that detailed understanding of their physicochemical properties has been, and still is, a necessary aid in the development of tomorrow’s green surfactant technology.

Contact : tellier@ill.fr

Discipline évènement : (Physique)
Entité organisatrice : (ILL)
Nature évènement : (Séminaire)
Evènement répétitif : (General ILL Seminar - College 9)
Site de l'évènement : Polygone scientifique

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