Antifouling membrane surface construction: Chemistry plays a critical role

Flexible PVDF based piezoelectric nanogenerators

Piezoelectric materials are widely referred to as "smart" materials because they can transduce mechanical pressure acting on them to electrical signals and vice versa. They are extensively utilized in harvesting mechanical energy from vibrations, human motion, mechanical loads, etc., and converting them into electrical energy for low power devices. Piezoelectric transduction offers high scalability, simple device designs, and high-power densities compared to electro-magnetic/static and triboelectric transducers. This review aims to give a holistic overview of recent developments in piezoelectric nanostructured materials, polymers, polymer nanocomposites, and piezoelectric films for implementation in energy harvesting. The progress in fabrication techniques, morphology, piezoelectric properties, energy harvesting performance, and underpinning fundamental mechanisms for each class of materials, including polymer nanocomposites using conducting, non-conducting, and hybrid fillers are discussed. The emergent application horizon of piezoelectric energy harvesters particularly for wireless devices and self-powered sensors is highlighted, and the current challenges and future prospects are critically discussed.

Piezoelectric Materials for Energy Harvesting and Sensing Applications: Roadmap for Future Smart Materials

With the increase of interest in the application of piezoelectric polyvinylidene fluoride (PVDF) in nanogenerators (NGs), sensors, and microdevices, the most efficient and suitable methods of their synthesis are being pursued. Electrospinning is an effective method to prepare higher content β-phase PVDF nanofiber films without additional high voltage poling or mechanical stretching, and thus, it is considered an economically viable and relatively simple method. This work discusses the parameters affecting the preparation of the desired phase of the PVDF film with a higher electrical output. The design and selection of optimum preparation conditions such as solution concentration, solvents, the molecular weight of PVDF, and others lead to electrical properties and performance enhancement in the NG, sensor, and other applications. Additionally, the effect of the nanoparticle additives that showed efficient improvements in the PVDF films was discussed as well. For instance, additives of BaTiO3, carbon nanotubes, graphene, nanoclays, and others are summarized to show their contributions to the higher piezo response in the electrospun PVDF. The recently reported applications of electrospun PVDF films are also analyzed in this review paper.

A Review of Piezoelectric PVDF Film by Electrospinning and Its Applications

Boosting piezoelectric response of PVDF-TrFE via MXene for self-powered linear pressure sensor

Enhanced piezoelectric performance of BiCl3/PVDF nanofibers-based nanogenerators

The invention relates to a method for preparing an aquogel matrix, in particular to a method for preparing the aquogel matrix for ultraviolet light three-dimensional (3D) printing and belongs to the technical field of preparation of biological materials. An alkenyl group is ingrafted on a chitosan molecular chain, a sulfydryl group is ingrafted on polyvinyl alcohol, and mixing is performed to obtain the aquogel matrix for ultraviolet light 3D printing. According to the aquogel matrix, sulfydryl-alkene 'click' reaction characteristic is fully utilized, gel forming is rapidly achieved under ultraviolet irradiation, inhibition of oxygen in air or a system can be fully overcome, 3D printing efficiency is greatly increased, cytocompatibility of the aquogel matrix is good, enough supporting environment is provided for cell growth, and cell adhesion, growth and proliferation can be facilitated. The preparation method is simple and low in costs, and industrial production is easy.

Method for preparing aquogel matrix for ultraviolet light three-dimensional (3D) printing

The invention relates to a preparation method of hydrogel dressing and particularly relates to a preparation method of chitosan hydrogel dressing and belongs to the technical field of preparation of medical dressing The preparation method provided by the invention comprises the following steps of synthesizing N-carboxyethyl-O-methacryloyl chitosan; and forming the bilateral crosslinking chitosan hydrogel dressing in a three-dimensional net structure through ultraviolet light polymerization and ionic crosslinking technologies, wherein the net structure of the ionic crosslinking part can be dissociated The preparation method provided by the invention fully exerts the synergistic effect of chemical crosslinking and ionic crosslinking so as to endow the dressing with good wet strength, toughness and elasticity As no toxic crosslinking agents such as aldehydes are adopted, the chitosan prepared is good in biocompatibility and does not cause any damage to wounds when being applied to the wounds, thereby facilitating healing of the wounds

Preparation method of chitosan hydrogel dressing

Carbon-coated magnesium ferrite composite nanofibers (MFO/C) have been synthesized via a combination of electrospinning and carbonization process. The as-prepared MFO/C with uniform carbon layers were explored as anode material for lithium-ion batteries. Electrochemical results show that benefiting from its appropriate carbon coating, MFO/C-2 can deliver a reversible capacity of 743 mAh g−1 after 200 cycles at 0.1 A g−1 and keep a stable capacity of 451 mAh g−1 at a high current density of 2 A g−1, which indicates MFO/C-2 are very prospective anode materials for high-performance lithium-ion batteries.

Polyvinylpyrrolidone-derived carbon-coated magnesium ferrite composite nanofibers as anode material for high-performance lithium-ion batteries

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Bai Zikui

Papers

Enhanced piezoelectric performance of BiCl3/PVDF nanofibers-based nanogenerators

Method for preparing aquogel matrix for ultraviolet light three-dimensional (3D) printing

Preparation method of chitosan hydrogel dressing

Polyvinylpyrrolidone-derived carbon-coated magnesium ferrite composite nanofibers as anode material for high-performance lithium-ion batteries

Photopolymerized Injectable Water-soluble Maleilated Chitosan/ Poly(ethylene glycol) Diacrylate Hydrogels as Potential Tissue Engineering Scaffolds