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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.)

Two-dimensional Rietveld analysis of celluloses from higher plants

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Autor(es):
Driemeier, Carlos [1]
Número total de Autores: 1
Afiliação do(s) autor(es):
[1] CTBE CNPEM, Lab Nacl Ciencia & Tecnol Bioetanol, BR-13083970 Campinas, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Cellulose; v. 21, n. 2, SI, p. 1065-1073, APR 2014.
Citações Web of Science: 9
Resumo

The Rietveld method is a versatile tool to parameterize the fine structure of crystallites analyzed by diffraction. The method relies on a crystallographic model representing what is known a priori, and free coefficients determined from fits to experimental data. This article provides an introduction to Rietveld analysis of celluloses from higher plants that are adequately described by the cellulose I beta crystal structure. Possibilities of Rietveld analysis have been recently enhanced by a tailored crystallographic model and computational algorithm, named Cellulose Rietveld Analysis for Fine Structure (CRAFS). From each two-dimensional diffraction pattern, CRAFS automated analysis outputs unit cell parameters, crystallite sizes, peak profile functions, integrated crystalline intensity (proportional to cellulose degree of crystallinity), and crystallite orientation distribution function. Two of the major hurdles for analysis of plant cellulose-overlapping of diffraction peaks and preferred crystallite orientation-are consistently treated by the two-dimensional Rietveld analysis. Hence, the method is a unique tool to explore cellulose fine structural variability, with differences arising from specimen conditioning, processing, and biological origins. (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