Asymmetric modification of cellulose nanocrystals with PAMAM dendrimers for the preparation of pH-responsive hairy surfaces. (1st December 2020)

• Record Type: Journal Article
• Authors: Chemin, Maud; Moreau, Céline; Cathala, Bernard; Villares, Ana
• Is Part Of: Carbohydrate polymers. Volume 249(2020)
• Publication Date: 2020-12-01
• Subjects: Tunicate cellulose nanocrystals -- Reducing end functionalization -- PAMAM dendrimers -- Gold adsorption -- pH-responsive layer -- Tunable swelling -- Quartz crystal microbalance with dissipation (QCM-D) -- Surface plasmon resonance (SPR); Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2020.116779
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: PAMAM dendrimers are attached to the reducing end of cellulose nanocrystals. The adsorption of hybrid particles on gold surface is studied by QCM-D and SPR. Amine groups of PAMAM lead to the adsorption of the CNC in an upright orientation. PAMAM moieties made the adsorbed hybrid particles pH-responsive. The size of the PAMAM dendrimer tunes the properties of the adsorbed hairy layer. Abstract: In this work, we present a straightforward method to attach a globular dendrimer at the reducing end of cellulose nanocrystals obtained from tunicates (t-CNC). We investigated the first four generations of poly(amidoamine) dendrimers (PAMAMs G0 to G3) to obtain hybrid t-CNCs. The aggregation behavior of hybrid t-CNCs was studied by dynamic light scattering (DLS) and scanning transmission electron microscopy (STEM); and interactions of these asymmetric nanoparticles with gold surface were elucidated using quartz crystal microbalance with dissipation (QCM-D) and surface plasmon resonance (SPR). Hybrid t-CNCs formed hairy layers onto gold surface combining the properties of rigid rod-like nanocrystals with globular and flexible PAMAM dendrimers. Moreover, the presence of amino groups provided pH-responsive properties to hybrid t-CNCs, and QCM-D results revealed reversible swelling/deswelling behavior. Thereby, we achieved to synthesize tree-shaped functional bio-based materials that adsorbed on gold and formed pH-responsive hairy surfaces.