What are the ranges and basis of auxeticity in the phases of cellulose microfibrils?

2017-09-05T18:38:57Z (GMT) by Akwasi Asamoah

One sample of 1D bundle of cellulose microfibrils in the form of lignified flax fibre (0.10526 mm x 10 mm), and one 2D networks of cellulose microfibrils in the form of tunicate cellulose (0.07 mm x 5 mm x 10 mm), bacterial cellulose (0.135 mm x 5 mm x 10 mm) and microfibrillated cellulose (0.08 mm x 5 mm x 10 mm) were put on a glass slide parallel to the principal spectrometer axis. Raman spectra were measured all round in-plane under both half (in 5° steps) polarisation from 0° to 360° in extended mode between 100 cm-1 and 1150 cm-1 in 3 accumulations at 10s exposure and 100% laser power. The cursor was placed at the peak of the 1095 cm-1 band, and intensity read.