Surface properties such as either hydrophilic or hydrophobic of nanocellulose are critical characteristics for the functionalization and/or utilization. Aqueous counter collision (ACC) process proposed by Kondo et al., which is capable to downsize materials into the nano-objects by impinging of dual high speed water jets containing samples, have recently been found to exposed the inherent hydrophobic surfaces engaged in van der Waals forces of cellulose pulp fibers onto the resulting ACC-nanocellulose surfaces.<br/>     In this article, the authors attempt to quantitatively determine the exposed hydrophobic surfaces in order to elucidate the amphiphilic properties as the entire ACC-nanocellulose.<br/>     As the indicator, Congo red, which is assumed to preferably adsorb onto hydrophobic faces in anhydroglucose units, was employed. The most striking impact in the results indicated that the degree of hydrophobicity imparted by ACC was dependent upon origins of the initial microfibers. Namely, hydrophobicity for ACC-nanocellulose from bamboo pulp, which exhibited the similar characteristics for bacterial pellicle, was almost twice greater than that for wood pulp.<br/>

Determination of hydrophobicity in amphiphilic nanocellulose imparted by Aqueous Counter Collision (ACC)

253rd National Meeting (2017)

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