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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Theoretical and experimental developments for accurate determination of crystallinity of cellulose I materials

Texto completo
Autor(es):
Driemeier, Carlos [1] ; Calligaris, Guilherme A. [1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Lab Nacl Ciencia & Tecnol Bioetanol CTBE, Campinas, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF APPLIED CRYSTALLOGRAPHY; v. 44, n. 1, p. 184-192, FEB 2011.
Citações Web of Science: 63
Resumo

This work defines the crystallinity of cellulose I materials on a dry-weight basis. Theoretical and experimental developments in X-ray diffraction lead to a crystallinity determination method that is estimated to reach 1 Sigma accuracies of better than 0.05 (crystallinity defined between 0 and 1). The method is based on Rietveld modelling, to resolve cellulose I Bragg peaks, and a standard truncated invariant integral. Corrections are derived to account for incoherent scattering, moisture content and other compositional deviations from pure cellulose. The experimental development uses X-ray diffraction in transmission fibre geometry with two-dimensional pattern Rietveld modelling, including a crystal-orientation distribution function. The crystallinities of a few commercial cellulose I materials were determined with the aim of illustrating the applicability of the method. (AU)

Processo FAPESP: 10/05523-3 - Alterações nanomorfológicas da matéria lignocelulósica de cana-de-açúcar
Beneficiário:Carlos Eduardo Driemeier
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores