TY - DATA T1 - Modulation of Assembly and Dynamics in Colloidal Hydrogels via Ionic Bridge from Cellulose Nanofibrils and Poly(ethylene glycol) PY - 2015/08/18 AU - Jun Yang AU - Xueming Zhang AU - Mingguo Ma AU - Feng Xu UR - https://acs.figshare.com/articles/journal_contribution/Modulation_of_Assembly_and_Dynamics_in_Colloidal_Hydrogels_via_Ionic_Bridge_from_Cellulose_Nanofibrils_and_Poly_ethylene_glycol_/2140477 DO - 10.1021/acsmacrolett.5b00422.s001 L4 - https://ndownloader.figshare.com/files/3774331 KW - 0.93 kPa KW - assembly approach KW - nanofibrils surface KW - PEG chains KW - hydrogels show KW - Cellulose Nanofibrils KW - materials offer principles KW - wt KW - cellulose applications KW - cellulose nanofibrils KW - gel state KW - Colloidal Hydrogels KW - Ionic Bridge KW - performance supramolecular systems KW - room temperature KW - CNF concentration N2 - The biologically inspired dynamic materials offer principles for designing man-made systems by using assembly approach. In this work, the hybrid hydrogels consist of cellulose nanofibrils (CNFs) that combine a mechanically strong skeleton with flexible PEG chains. The distinct gel state is observed at room temperature with G′ > G″ and an order of magnitude higher G′ values from 0.08 to 0.93 kPa upon increasing CNF concentration from 0.2 to 2 wt % at constant 2 wt % PEG. Combined with mechanically strong CNFs and dynamic ionic bridges through amine-terminated tetra-arm PEG adsorption to TEMPO-oxidized colloidal nanofibrils surface, the assembled colloidal hydrogels show high modulus, reversible gel–sol transition, and rapid self-recovery properties. It is envisioned that simply mixing hard CNF and soft polymeric matrix would lead to a facile method to bridge reversible dynamic bonds in a cellulose-based hybrid network and broad cellulose applications in the preparation of high performance supramolecular systems. ER -