Structural investigations of cellulosic materials with x-ray and neutron scattering
Mardi 8 octobre 2013 10:30
- Duree : 1 heure
Lieu : Room 248a, Central Building, ESRF - 6 Rue Jules Horowitz - Grenoble
Orateur : Paavo A. PENTTILA (University of Helsinki, Department of Physics)
Lignocellulosic biomass represents high potential for sustainable production of biofuels, chemicals, and new materials. The development of processes aiming at a complete utilization of the available resources requires information on the structure of lignocelluloses and how it is affected in the different treatments. X-ray scattering methods are able to provide information on the structure of lignocelluloses on a wide range of length scales. Wide-angle x-ray scattering (WAXS) can be used to study the crystalline proportion of cellulose, yielding parameters such as cellulose crystal size, crystallinity, and fibrillar orientation. Small-angle x-ray and neutron scattering (SAXS and SANS), on the other hand, can be used to probe the nanoscale structure of these materials, including the short-range order of cellulose microfibrils and pore structure under both dry and wet states. This presentation surveys the structural information obtainable by WAXS and SAXS/SANS from fibrillar cellulosic materials, discussing several examples related to different applications. In particular, results on the effects of pressurized hot water treatment on birch sawdust and of enzymatic hydrolysis on cellulosic substrates are presented.
Contact : eva.jahn@esrf.fr
Discipline évènement : (Physique)
Entité organisatrice : (ESRF)
Nature évènement : (Séminaire)
Evènement répétitif : (Séminaire ESRF)
Site de l'évènement : Polygone scientifique
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