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UBC Theses and Dissertations

Rheological characterization of CNC-CTAB network below and above the critical micelle concentration (CMC) Raeisi Gahrooee, Tina


The network of Cellulose Nanocrystal (CNC) suspension is explored below and above the critical micelle concentration (CMC), in the presence of cetyltrimethylammonium bromide (CTAB) with a positively charged head using rheological characterization. CNC-CTAB gel showed shear thinning behaviour, complex relationship between strain amplitudes and CTAB concentration, diminishing thixotropic behaviour as a function of CTAB and single and two yielding stress maxima as a function of CTAB, resulting from different microstructure below and above CMC of CTAB. Comparing the flow curves of CNC-CTAB suspension/gel revealed the role played by CTAB content, CNC concentration and sonication energy in strengthening of the network. We analysed and obtained yield stress from steady shear, creep testing and oscillatory experiments and compared them.

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