Nanocellulose, a Versatile Green Platform: From Biosources to Materials and Their Applications

Abstract

With increasing environmental and ecological concerns due to the use of petroleum based chemicals and products, the synthesis of fine chemicals and functional materials from natural resources is of great public value. Nanocellulose may prove to be one of the most promising green materials of modern times due to its intrinsic properties, renewability and abundance. In this review, we present nanocellulose-based materials from sourcing, synthesis, and surface modification of nanocellulose, to materials formation and applications. Nanocellulose can be sourced from biomass, plants or bacteria, relying of fairly simple, scalable and efficient isolation techniques. Mechanical, chemical, enzymatic treatments, or a combination of these, can be used to extract nanocellulose from natural sources. The properties of nanocellulose are dependent on the source, the isolation technique and potential subsequent surface transformations. Nanocellulose surface modification techniques are typically used to introduce either charged or hydrophobic moieties, and include: amidation, esterification, etherification, silylation, polymerization, urethanization, sulfonationand phosphorylation. Nanocellulose has excellent strength, Young's modulus, biocompatibility, and tunable self-assembly, thixotropic and photonic properties, which are essential for the applications of this material. Nanocellulose participates in the fabrication of a large range of nanomaterials and nanocomposites, including those based on polymers, metals, metal oxides and carbon. In particular, nanocellulose complements organic-based materials, where it imparts its mechanical properties to the composite. Nanocellulose is a promising material whenever material strength, flexibility and/or specific nanostructuring are required. Applications include functional paper, optoelectronics and antibacterial coatings, packaging, mechanically reinforced polymer composites, tissue scaffolds, drug delivery, biosensors, energy storage, catalysis, environmental remediation and 3 electrochemical controlled separation. Phosphorylated nanocellulose is a particularly interesting material, spanning a surprising set of applications in various dimensions including bone scaffolds, adsorbents, flame retardants and as a support for the heterogenization of homogeneous catalysts.

Systematic Hydrogen‐Bond Manipulations To Establish Polysaccharide Structure–Property Correlations

“…[1] Thes tability,c rystallinity,a nd poor water sol-ubility of cellulose are the result of adense network of interand intramolecular hydrogen bonds that create allomorphs with different properties (Figure 1). [1] Thes tability,c rystallinity,a nd poor water sol-ubility of cellulose are the result of adense network of interand intramolecular hydrogen bonds that create allomorphs with different properties (Figure 1).…”

Preparation and application of nanocellulose from Miscanthus × giganteus to improve the quality of paper for bags

“…They are able to replace materials made from exhaustible natural resources-oil, gas, coal. The processing products of such renewable plant materials are widely used in the chemical, pharmaceutical, paper, textile and electronic industries [37,40]. Biodegradable materials based on annually renewable plant raw materials can become the basis for the production of environmentally friendly products and can compete with products made from petroleum materials.…”

Naked‐Eye Heterogeneous Sensing of Fluoride Ions by Co‐Polymeric Nanosponge Systems Comprising Aromatic‐Imide‐Functionalized Nanocellulose and Branched Polyethyleneimine

“…Interest towards nanocellulose (NC) as additive or building block for the design of innovative materials is continuously increasing, due to its several useful properties. NC can be easily obtained, following different mechanical or chemical approaches, by cleaving the hierarchical structure of cellulose, one of the most abundant among renewable biopolymers .…”