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Nanofibrillated cellulose (NFC) is becoming popular in antibacterial material due to its favorable biocompatibility, stability, and modifiable properties, which give it a great potential as a template for the deposition of silver nanoparticles (Ag NPs). To investigate the deposition procedure and antibacterial ability of Ag NPs, dialdehyde nanofobrillated cellulose (DATNFC) prepared by oxidation of nanofibers was used to initiate the silver mirror reaction. Silver nanoparticles (∼31.07 nm) were successfully fabricated and uniformly anchored onto DATNFC (DATNFC@Ag). The film containing DATNFC@Ag via vacuum filtration showed excellent mechanical properties and exhibited efficient antibacterial activity against both Staphylococcus aureus and Escherichia coli. Dialdehyde nanofobrillated cellulose-induced silver ions release slowly, which displayed a controllable release of silver ions with a rate of 0.63% per 2 days and an ultralong Ag + release period of 323.6 days. The Ag + release time was prolonged due to the efficient in situ immobilization of silver nanoparticles. This study offers a novel and simple way to fabricate a green, controlled release and long-term antibacterial material based on dialdehyde nanofibrillated cellulose/silver-nanoparticle composites and opens a new window for the rapid and highly efficient synthesis of silver nanoparticles.

Conductive hydrogels have emerged as promising material candidates for multifunctional strain sensors attributing to their similarity to biological tissues, good wearability, and high accuracy of information acquisition. However, it is...

As a nanoscale renewable resource derived from lignocellulosic materials, cellulose nanocrystals (CNCs) have the features of high purity, high crystallinity, high aspect ratio, high Young's modulus, and large specific surface area. The most interesting trait is that they can form the entire films with bright structural colors through the evaporation‐induced self‐assembly (EISA) process under certain conditions. Structural color originates from micro‐nano structure of CNCs matrixes via the interaction of nanoparticles with light, rather than the absorption and reflection of light from the pigment. CNCs are the new generation of photonic liquid crystal materials of choice due to their simple and convenient preparation processes, environmentally friendly fabrication approaches, and intrinsic chiral nematic structure. Therefore, understanding the forming mechanism of CNCs in nanoarchitectonics is crucial to multiple fields of physics, chemistry, materials science, and engineering application. Herein, a timely summary of the chiral photonic liquid crystal films derived from CNCs is systematically presented. The relationship of CNC, structural color, chiral nematic structure, film performance, and applications of chiral photonic liquid crystal films is discussed. The review article also summarizes the most recent achievements in the field of CNCs‐based photonic functional materials along with the faced challenges.

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To date, various electronic devices have been strategically fabricated, and simultaneous realization of high electrical conductivity, sensing property, and heat-conducting property by a simple, efficient, and accurate approach is significant but still challenging. Here, cellulosic fiber supported 3D interconnected silver nanowire (AgNW) networks with hierarchical structures are rationally designed to achieve excellent electrical conductivity and superior thermal dispersion capability. In particular, thermal annealing at the junctions enables both phonon and electron transfer as well as impedes interfacial slippage. In the current study, the AgNW/cellulosic paper with the low Ag content (1.55 wt %) exhibits a low sheet resistance of 0.51 Ω sq −1 . More importantly, the AgNW/cellulosic paper-based flexible strain sensor has been reasonably developed, which can be applied to monitor various microstructural changes and human motions with high sensitivity and robust stability (fast response/relaxation time of ∼100 ms and high stability >2000 bending− stretching cycles). The AgNW/cellulosic paper-based device also displays efficient thermal dispersion property, which offers exciting opportunities for thermal management application. Furthermore, the obtained hybrid paper exhibits superior heat dispersion capacity for thermal management devices. Overall, uniform dispersion and 3D interconnected junctions of AgNW among the fibers inside the cellulosic papers lead to the combination of high mechanical strength, highly efficient electrical conductivity, and ultrahigh heat dispersion property. The AgNW/cellulosic paper has promising potentials in the flexible and wearable sensing elements, thermal management materials, and artificial intelligence devices.

5-Halomethylfurfurals can be considered as platform chemicals of high reactivity making them useful for the preparation of a variety of important compounds. In this study, a one-pot route for the conversion of carbohydrates into 5-chloromethylfurfural (CMF) in a simple and efficient (HCl-H 3 PO 4 /CHCl 3 ) biphasic system has been investigated. Monosaccharides such as D-fructose, D-glucose and sorbose, disaccharides such as sucrose and cellobiose and polysaccharides such as cellulose were successfully converted into CMF in satisfactory yields under mild conditions. Our data shows that when using D-fructose the optimum yield of CMF was about 47%. This understanding allowed us to extent our work to biomaterials, such as wood powder and wood pulps with yields of CMF obtained being comparable to those seen with some of the enumerated mono and disaccharides. Overall, the proposed (HCl-H 3 PO 4 /CHCl 3 ) optimized biphasic system provides a simple, mild, and cost-effective means to prepare CMF from renewable resources.