1959
DOI: 10.1177/004051755902901003 View full text |Buy / Rent full text
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Abstract: An empirical method for determining the crystallinity of native cellulose was studied with an x-ray diffractometer using the focusing and transmission techniques. The influence of fluctuations in the primary radiation and in the counting and recording processes have been determined. The intensity of the 002 interference and the amor phous scatter at 2θ = 18° was measured. The percent crystalline material in the total cellulose was expressed by an x-ray "crystallinity index." This was done for cotton cellulose … Show more

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“…Data were analyzed employing X'Pert HighScore software. The crystallinity index, %Ic(XRD), was calculated at several temperatures using the equation proposed by Segal [38]:…”
Section: Methodsmentioning
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“…Data were analyzed employing X'Pert HighScore software. The crystallinity index, %Ic(XRD), was calculated at several temperatures using the equation proposed by Segal [38]:…”
Section: Methodsmentioning
“…O índice de cristalinidade (Ic) da celulose foi calculado através da equação: Ic = 1 -I 1 / I 2 [7,30,31] , onde I 1 = intensidade do mínimo de difração, relacionada à parte amorfa (2θ = 18,8°) e I 2 = intensidade do máximo de difração, relacionada à parte cristalina (2θ = 22,4°). Este método foi desenvolvido por Segal e colaboradores [30] e tem sido largamente utilizado para o estudo de fibras naturais [7,9,10,[31][32][33][34][35] .…”
Section: Methodsunclassified
“…They are also becoming more cost-effective as compared to other pretreatment options (George et al 2015). ILs are efficient for biomass dissolution, which is typically reported as a change in crystallinity index (CrI) (Kumar et al 2009;Segal et al 1959;Thygesen et al 2005). For example, the degrees of crystallinity in cellulose reconstituted after being dissolved in 1-allyl-3-methylimidazolium chloride ([C 3 C 1 Im]Cl) and 1-butyl-3-methylimidazolium chloride ([C 4 C 1 Im]Cl) were lower than untreated cellulose, resulting in an increased accessibility of the polysaccharide chains to cellulases (Dadi et al 2007;Dadi et al 2006;Liu and Chen 2006).…”
Section: Introductionmentioning