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Optical characterization of the composite organosilica/cellulose nanocrystal (OS/CNC) films made with increasing BTMSE:CNC ratios. a) Polarized optical microscopy in reflection using respectively left- (LCP) and right-circular polarization (RCP) filters, showing a red-shift of the reflected light. b) Reflection spectra measured on the same samples using a double-ended fiber in normal incidence, normalized to a white diffuser.
