Adsorption Behavior of Reducing End-Modified Cellulose Nanocrystals:A Kinetic Study Using Quartz Crystal Microbalance  

作　　者：Maud Chemin Céline Moreau Bernard Cathala Ana Villares 

机构地区：[1]INRAE,UR BIA,F-44316,Nantes,France

出　　处：《Journal of Renewable Materials》2020年第1期29-43,共15页可再生材料杂志（英文）

基　　金：French National Research Agency(Project Cellmach,ANR-17-CE07-0010-01);Region Pays de la Loire(Project Nanomach,Etoiles Montantes 2017-10691).

摘　　要：In this work,we studied the adsorption of modified cellulose nanocrystals onto solid surfaces by quartz crystal microbalance with dissipation monitoring(QCM-D).Cellulose nanocrystals obtained from tunicate(CNC)were modified at reducing end by amidation reactions.Two different functionalities were investigated:a polyamine dendrimer(CNC-NH_(2)),which interacts with gold surface by the amine groups;and a biotin moiety(CNC-Biot),which has a strong affinity for the protein streptavidin(SAV).QCM-D results revealed different adsorption behaviors between modified and unmodified CNCs.Hence,unmodified CNCs covered almost all the surface forming a rigid and flat layer whereas reducing end modified CNCs remained rather upright forming a hydrated and viscoelastic layer with lower surface coverage.The analysis of adsorption kinetics allowed the calculation of an apparent collision rate factor,which resulted 10-fold higher for unmodified CNCs compared to reducing end modified CNCs,therefore,demonstrating the different adsorption behavior.

关 键 词：Cellulose nanocrystals AMIDATION reducing-end modification Voight model collision rate efficiency factor rate constant 

分 类 号：O64[理学—物理化学]