In this study, cellulose nanocrystals (CNC) were produced with different sizes; they were then carboxymethylated to generate carboxymethylated CNC (CCNC) to be used as dispersants for a kaolinite suspension at different pH. It was observed that larger CNC rendered CCNC with a higher surface charge. The largest CCNC (CCNC3) adsorbed more on kaolinite particles and impacted the surface charge density of the particles more dramatically than did other CCNCs. Furthermore, CCNC3 stabilized the kaolinite suspension at a lower dosage and to a higher degree than other CCNCs, and the strength of stability was greater for CCNC3 compared to the other ones. Also, CCNC was a much better dispersant than CNC as it impacted the level and strength of kaolinite system’s stability more pronouncedly. Furthermore, a larger CCNC, which can be produced under milder hydrolysis reactions of pulp, can respond to carboxymethylation more effectively and make a more efficient dispersant for the kaolinite suspension, which is advantageous for industrial applications.

在这项研究中，生产了不同尺寸的纤维素纳米晶体（CNC）。然后将其羧甲基化，生成羧甲基化的CNC（CCNC），用作不同pH下高岭石悬浮液的分散剂。观察到较大的CNC使CCNC具有更高的表面电荷。最大的CCNC（CCNC3）与其他CCNC相比，对高岭石颗粒的吸附更多，并且对颗粒表面电荷密度的影响更大。此外，CCNC3以比其他CCNC更低的剂量和更高的程度稳定了高岭土悬浮液，并且CCNC3的稳定性强度比其他CCNC高。同样，CCNC是比CNC更好的分散剂，因为它对高岭石体系稳定性的水平和强度的影响更为明显。此外，更大的CCNC