A simple
preparation process was developed for magnetic nanoparticles, consisting
of chitosan coated on Fe3O4 nanoparticles, to
be used as support for enzyme immobilization. Cellulase was covalently
immobilized on this magnetic support using glutaraldehyde as a coupling
agent. The structure, morphology, and magnetic property of the support
were studied by X-ray diffraction, vibrating-sample magnetometer,
thermogravimetric analysis, transmission electron microscopy, and
Fourier transform infrared (FT-IR) spectroscopy. The properties of
the immobilized cellulase were investigated by regarding activity,
optimum operational pH and temperature, thermal stability, and reusability.
The amount of cellulase on the nanoparticles reached 112.3 mg/g. The
characterization and determination results showed that the immobilized
cellulase had higher operational stability than the free enzyme over
wider temperature and pH ranges and good reusability after recovery
by magnetic separation. Therefore, these magnetic Fe3O4–chitosan nanoparticles are expected to be a useful
support for enzyme.
A conducting polymer-based hydrogel (PPy/CPH) with a polypyrrole-poly(vinyl alcohol) interpenetrating network was prepared by utilization of a chemical cross-linked poly(vinyl alcohol)-HSO hydrogel (CPH) film as flexible substrate followed by vapor-phase polymerization of pyrrole. Then an all-solid-state polymer supercapacitor (ASSPS) was fabricated by sandwiching the CPH film between two pieces of the PPy/CPH film. The ASSPS is mechanically robust and flexible with a tensile strength of 20.83 MPa and a break elongation of 377% which is superior to other flexible conducting polymer hydrogel-based supercapacitors owing to the strong hydrogen bonding interactions among the layers and the high mechanical properties of the PPy/CPH. It exhibits maximum volumetric specific capacitance of 13.06 F/cm and energy density of 1160.9 μWh/cm. The specific capacitance maintains 97.9% and 86.3% of its initial value after 10 000 folding cycles and 10 000 charge-discharge cycles, respectively. The remarkable electrochemical and mechanical performance indicates this novel ASSPS device is promising for flexible electronics.
flexible supercapacitors (FSCs) has gradually replaced traditional batteries as an inevitable trend. [5-7] Among them, flexible supercapacitors are considered as the most potential candidates due to their high efficiency, long cycle life, and simple maintenance. Recently, researchers have devoted tremendous efforts to preparing flexible supercapacitors with bendable, foldable, and high softness characteristics. [8-12] Generally, a flexible supercapacitor is composed of flexible electrodes and a gel-state solid electrolyte. The flexible electrodes consist of electroactive materials that provide electrochemical performance and an elastic matrix that acts as the flexible skeleton. The electrochemical performance of the integrated composite electrode is mainly determined by the electroactive material, while the mechanical properties are determined by the flexible substrate material. At present, the commonly used flexible substrates are fabric, carbon cloth, elastoplastic film, and paper. [13-17] Although these flexible
In this work, composite nanoparticles containing polypyrrole, silver and attapulgite (PPy/Ag/ATP) were prepared via UV-induced dispersion polymerization of pyrrole using ATP clay as a templet and silver nitrate as photoinitiator. The effects of ATP concentration on morphology, structure and electrical conductivity were studied. The obtained composite nanoparticles with an interesting beads-on-a-string morphology can be obtained in a short time (10 min), which indicates the preparation method is facile and feasible. To explore the potential applications of the prepared PPy/Ag/ATP composite nanoparticles, they were served as multifunctional filler and blended with poly(butylene succinate) (PBS) matrix to prepare biodegradable composite material. The distribution of fillers in polymer matrix and the interfacial interaction between fillers and PBS were confirmed by scanning electron microscope, elemental mapping and dynamic mechanical analysis. The well dispersed fillers in PBS matrix impart outstanding antibacterial property to the biodegradable composite material as well as enhanced storage modulus due to Ag nanoparticles and ATP clay. The biodegradable composite material also possesses modest surface resistivity (106 ~ 109 Ω/◻).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.