Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 113, Issue 32, Pages 11069-11075Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp900122t
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Cotton cellulose nanocrystals with different aspect ratios have been dispersed in cyclohexane as a model apolar solvent, using surfactants. Above a critical concentration, which was higher than that in water, the suspensions spontaneously phase separated into a chiral nematic mesophase. According to Onsager's theory, the phase separation is controlled by the aspect ratio, while being influenced by the polydispersity. The sample with the highest aspect ratio did not show any phase separation but instead shows an anisotropic gel phase at high concentration. Experimental critical concentrations were found to be much lower than the predicted ones, revealing an attractive interaction between the rods. Chiral nematic pitches as small as 2 mu m were found to be much lower than those measured in water, due to stronger chiral interactions in the apolar medium.
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