A EVOLUÇÃO DA INDÚSTRIA DE CELULOSE E ... - Revista O Papel

Technical Article / Peer-reviewed ArticleO PAPEL vol. 74, num. 2, pp. 37 - 40 FEB 2013per day and consuming only nitrogen gas and disposable aluminumpans and lids. Setup of dynamic vapor sorption is also automated,running one sample per day and consuming only nitrogen gas.X-ray diffraction analysis demands more work. Measurement of20 samples is done in a 12 hours shift and data analysis demandsmore than a week of a trained analyst. Nevertheless, automationof data analysis is now under development.CONCLUSIONSX-ray diffraction, dynamic vapor sorption, and thermoporometrybring complementary ultrastructural information about celluloses.X-ray diffraction is primarily sensitive to cellulose crystallites thatform the core of microfibrils. Dynamic vapor sorption probesprimarily the first hydration layers surrounding these crystallites.Thermoporometry probes nanometric water-filled pores definedbetween bundles of cellulose crystallites. Combining these threeanalytical techniques brings a comprehensive ultrastructuralpicture of a cellulose sample. Analysis of a wide spectrum ofcelluloses processed from plants evidenced that material-specificproperties as well as general ultrastructural laws can be inferredfrom these techniques combined.•AcknowledgementsFinancial support from FAPESP (project 2010/05523-3).REFERENCES1. Atalla, R. H.; Vanderhart, D. L. (1984): Native cellulose: a composite of two distinct crystalline forms. Science. 223 (4633) 283-2852. Bragatto, J.; Segato, F.; Cota, J.; Mello, D. B.; Oliveira, M. M.; Buckeridge, M. S.; Squina, F. M.; Driemeier, C. (2012): Insights on howthe activity of an endoglucanase is affected by physical properties of insoluble celluloses. Journal of Physical Chemistry B. 116 (21) 6128-61363. Debzi, E. M.; Chanzy, H.; Sugiyama, J.; Tekely, P.; Excoffier, G. (1991): The Iα •Iβ transformation of highly crystalline cellulose byannealing in various mediums. 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