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• W2108922180 startingPage "1340" @default.
• W2108922180 abstract "The deformation micromechanics of bacterial cellulose (BC) and microfibrillated cellulose (MFC) networks have been investigated using Raman spectroscopy. The Raman spectra of both BC and MFC networks exhibit a band initially located at ≈ 1095 cm(-1). We have used the intensity of this band as a function of rotation angle of the specimens to study the cellulose fibril orientation in BC and MFC networks. We have also used the change in this peak's wavenumber position with applied tensile deformation to probe the stress-transfer behavior of these cellulosic materials. The intensity of this Raman band did not change significantly with rotation angle, indicating an in-plane 2D network of fibrils with uniform random orientation; conversely, a highly oriented flax fiber exhibited a marked change in intensity with rotation angle. Experimental data and theoretical analysis shows that the Raman band shift rate arising from deformation of networks under tension is dependent on the angles between the axis of fibrils, the strain axis, the incident laser polarization direction, and the back scattered polarization configurations. From this analysis, the effective moduli of single fibrils of BC and MFC in the networks were estimated to be in the ranges of 79-88 and 29-36 GPa, respectively. It is shown also that for the model to fit the data it is necessary to use a negative Poisson's ratio for MFC networks and BC networks. Discussion of this in-plane auxetic behavior is given." @default.
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• W2108922180 date "2012-03-30" @default.
• W2108922180 modified "2023-10-18" @default.
• W2108922180 title "Effective Young’s Modulus of Bacterial and Microfibrillated Cellulose Fibrils in Fibrous Networks" @default.
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• W2108922180 doi "https://doi.org/10.1021/bm300042t" @default.
• W2108922180 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22423896" @default.
• W2108922180 hasPublicationYear "2012" @default.
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