Wrapping Nanocellulose Nets around Graphene Oxide Sheets

Abstract

Constructing advanced functional nanomaterials with pre-designed organized morphologies from low-dimension synthetic and biological components is challenging. Herein, we report an efficient and universal amphiphilicitydriven assembly strategy to construct "hairy" flexible hybrid nanosheets with a1 Dc ellulose nanofibers (CNFs) net conformally wrapped around 2D graphene oxide (GO) monolayers.T his interface-driven bio-synthetic assembly is facilitated by tailoring the surface chemistry of flexible GO sheets,r esulting in individual sheets tightly surrounded by dense conformal nanocellulose network. The mechanical stability of the products far exceeds the compressive instability limits of both individual components.A dditionally,t he CNF network significantly enhances the wetting ability of initial hydrophobic reduced GO nanosheets,a llowing fast water transport combined with high filtration efficiency.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi. Figure 3. a) AFM images of GO/CNFsh ybrids with different oxidation degree of the GO plane prepared under different pH conditions. C-O is the total fraction of -OH and -O-groups on GO surface. b) All-atom MD simulationsofthe self-assembly behavior for CNFsand GO with different oxidation degree of the graphene plane. The non-bonded interactions (c;van der Waals:blue;e lectronic: red) and d) hydrogen bonds between CNF and GO with different oxidation degree calculated from the simulation results (PG = pristine graphene).

Highly Conducting Nanographite-Filled Paper Fabricated via Standard Papermaking Techniques

“…In the case of CNFs, several different explanations have been reported for the adhesion phenomena. One suggested mechanism is van der Waals forces operating between hydrophobic sites of the CNFs and the carbon material, 4 , 5 whereas another suggestion is an interlocking effect caused by the induced polarization along the nanocarbons generated from the charged groups of the CNFs and their counterions. 17 We view it as probable that the NG–fiber adhesion is of similar origins.…”

“…Conductive cellulose-based composites have received much attention over the past decade, where cellulose nanofibrils (CNFs) have been successfully combined with nanocarbons. CNFs have an intrinsic attraction to nanocarbons, 4 , 5 by which the excellent mechanical properties of CNFs and the high electrical conductivity of various nanocarbons can be exploited to prepare high-performing composites 6 , 7 with conductivities approaching 10 3 S/cm. 8 However, CNF-based composites are challenging to produce on a larger scale due to the inherent high dewatering resistance of CNFs.…”

Genetically engineered protein based nacre-like nanocomposites with superior mechanical and electrochemical performance

“…In this case, the assembled resilin-protein in between RGO and NFC layers acts as an elastic interface, which undergoes structural transitions under the tensile load. 57 The molecular motifs, CBMs and HFBI adhere strongly to NFC and RGO creating an effective path for slippage in between the adjacent layers, as it is gradually stretched. However, at pH $ 11, even though the fusion protein adopts the most extended state, cellulose undergoes increased swelling which possibly lowers the binding efficiency of molecular motifs with NFC/ RGO.…”

Integration of Optical Surface Structures with Chiral Nanocellulose for Enhanced Chiroptical Properties

“…[20], [21] CNC materials are naturally abundant, biocompatible, biodegradable, and possess outstanding mechanical strength, making them an attractive alternative to common synthetic materials. [22], [23], [24] However, chiral CNC films formed by EISA usually suffer from poor photonic performance because of distorted nanostructures that largely reduce the reflection intensity, selectivity, and circular dichroism of CP light. [25], [26], [27], [28] To improve structural uniformity and thus photonic performance, various approaches have been suggested including controlling the EISA assembly by confined geometries, drying at controlled humidity and temperature, and adding extrinsic components.…”

“…Needle‐like cellulose nanocrystals (CNCs) are promising natural materials for CP structures due to the strong twisting power of the intrinsic chiral organization formed in cast films via evaporation‐induced self‐assembly (EISA) . CNC materials are naturally abundant, biocompatible, biodegradable, and possess outstanding mechanical strength, making them an attractive alternative to common synthetic materials . However, chiral CNC films formed by EISA usually suffer from poor photonic performance because of distorted nanostructures that largely reduce the reflection intensity, selectivity, and circular dichroism of CP light .…”