نتایج جستجو برای: cellulose nanocrystal

تعداد نتایج: 32689  

Journal: :Carbohydrate polymers 2016
Marcos Mariano Nadia El Kissi Alain Dufresne

Natural rubber (NR) latex particles were oxidized using KMnO4 as oxidant to promote the insertion of hydroxyl groups in the surface polyisoprene chains. Different degrees of oxidation were investigated. Both unoxidized and oxidized NR (ONR) latex were used to prepare nanocomposite films reinforced with cellulose nanocrystals (CNCs) by casting/evaporation. The oxidation of NR was carried out to ...

2014
Ahu Gümrah Dumanli Hanne M. van der Kooij Gen Kamita Erwin Reisner Jeremy J. Baumberg Ullrich Steiner Silvia Vignolini

Cellulose nanocrystals (CNCs) form chiral nematic phases in aqueous suspensions that can be preserved upon evaporation of water. The resulting films show an intense directional coloration determined by their microstructure. Here, microreflection experiments correlated with analysis of the helicoidal nanostructure of the films reveal that the iridescent colors and the ordering of the individual ...

2011
Yucheng Peng Douglas J. Gardner Yousoo Han

Increasing research activity on cellulose nanofibril-based materials provides great opportunities for novel, scalable manufacturing approaches. Cellulose nanofibrils (CNFs) are typically processed as aqueous suspensions because of their hydrophilic nature. One of the major manufacturing challenges is to obtain dry CNFs while maintaining their nano-scale dimensions. Four methods were examined to...

Journal: :International Journal of Polymer Science 2019

Journal: :Cellulose 2022

Abstract Birefringence measurements of aqueous cellulose nanocrystal (CNC) suspensions are reported. Seven with concentrations between 0.7 and 1.3% per weight sheared in a Taylor-Couette type setting characterized using birefringent measurement technique based on linear polarized light acquisition polarization camera. Steady state shear rates up to 31 1/s show extinction angles 23°–40° birefrin...

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