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    Interaction of hairy carboxyalkyl cellulose nanocrystals with cationic surfactant: Effect of carbon spacer

    Year: 2021

    Journal: Carbohydr. Polym., Volume 255, MAR 1

    Authors: Feizi, Zahra Hosseinpour; Fatehi, Pedram

    Organizations: NSERC; Canada Foundation for Innovation; Canada Research Chairs; Northern Ontario Heritage Fund Corporation; Ontario Research Fund programs

    Keywords: Carboxyalkylation; Carboxybutylation; Carboxyheptanation; Carboxypantadecanation; Cellulose nanocrystals; Cationic surfactant

    Tuning the surface chemistry of nanocellulose is essential for developing its end-use applications. Herein, different carboxyalkylated cellulose nanocrystals (CNC) with similar charge densities but with tunable hairy structures were produced. The effect of carbon spacer of the grafted groups on the interaction of the CNC and a cationic surfactant, myristyl trimethyl ammonium bromide (MTAB), at different pH and salinity was explored. The CNC with longer grafted chain length was more hydrophobic, adsorbed more MTAB, and formed a more compact MTAB adlayer than did CNC with the shorter chain length. Also, the adsorption was higher at neutral pH, implying a high electrostatic attraction and hydrophobic interaction between substrates. The hydrophobic interaction of MTAB and hairy CNC in saline systems improved its adsorption. Although MTAB adsorbed more when its concentration was higher than its critical micelle concentration (CMC), the adsorbed adlayer had a less compact structure on the CNC surfaces.
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