A novel controlled drug delivery system based on alginate hydrogel/chitosan micelle composites.

Alginate is a natural polysaccharide that is easily chemically modified or compounded with other components for various types of functionalities. The alginate derivatives are appealing not only because they are biocompatible so that they can be used in biomedicine or tissue engineering but also because of the prospering bioelectronics that require various biomaterials to interface between human tissues and electronics or to serve as electronic components themselves. The study of alginate-based materials, especially hydrogels, have repeatedly found new frontiers over recent years. In this Review, we document the basic properties of alginate, their chemical modification strategies, and the recent development of alginate-based functional composite materials. The newly thrived functions such as ionically conductive hydrogel or 3D or 4D cell culturing matrix are emphasized among other appealing potential applications. We expect that the documentation of relevant information will stimulate scientific efforts to further develop biocompatible electronics or smart materials and to help the research domain better address the medicine, energy, and environmental challenges faced by human societies.

Recent Development of Alginate-Based Materials and Their Versatile Functions in Biomedicine, Flexible Electronics, and Environmental Uses.

Biocompatible and biodegradable chitosan/sodium polyacrylate polyelectrolyte complex hydrogels with smart responsiveness.

Construction of chitosan/Ag nanocomposite sponges and their properties

Advances in multifunctional biomass-derived nanocomposite films for active and sustainable food packaging.

The development of novel biodegradable and ultraviolet (UV) shielding packaging materials has become a research hotspot, which could avoid “white pollution”. Chitosan is an ideal raw material for food packaging but lacks sufficient UV shielding property. In this work, we used an alkali/urea/zincate aqueous solvent to dissolve chitosan, and the resulting chitosan solution was heated with the existence of chemical crosslinker to convert Zn(OH)42− into ZnO particles directly. Then, the chitosan/ZnO composite hydrogel sheets were obtained, which were converted to chitosan/ZnO composite bioplastic (CCZP) by a fixing and drying process. The structure and properties of CCZP were investigated with X-ray diffraction (XRD), scanning electron microscopy, XPS, water uptake and tensile testing etc. The results indicated that the in-situ synthesized ZnO particles had distributed evenly in the chitosan matrix. The optical transmittance of the obtained CCZP reached 0.01% at 300 nm and 51.6% at 800 nm, respectively, showing excellent UV shielding performance and relatively good visible light transmittance. Meanwhile, the mechanical properties of the chitosan bioplastic were improved by the incorporation of ZnO, and the tensile strength of CCZP reached up to 49.8 MPa, showing potential application as food packaging materials.

Fabrication and properties of novel chitosan/ZnO composite bioplastic

Construction of alternate layered chitosan/alginate composite hydrogels and their properties

The invention discloses a preparation method of flexible and high-water-content cellulose-chitosan-based composite gel. The preparation method comprises the following steps that 1, chitosan is dissolved by taking a KOH/LiOH.H2O/urea aqueous solution as a solvent through a freezing-thawing method to prepare a chitosan solution; 2, cellulose is dissolved through the precooled LiOH/urea aqueous solution to prepare a cellulose solution; 3, the two solutions are blended after being subjected to centrifugal debubbling, after the blended solution is subjected to centrifugal debubbling, a blended solution with the certain thickness is prepared through a glass rod wound with a coil and then placed into an ethyl acetate atmosphere to be treated for a period of time, and then the chitosan-cellulose composite gel can be prepared. The composite gel is fixed to an organic glass plate to be dried, and then a composite membrane can be prepared. The prepared chitosan-cellulose composite gel has the high flexibility, water content, air permeability and bacteriostasis and the good biocompatibility and can be expected to be used as a mask material, the composite membrane prepared by drying the composite gel at room temperature has the high strength, light transmittance and bacteriostasis and can be expected to be used as a bacteriostatic packaging material.

Flexible and high-water-content cellulose-chitosan-based composite gel and corresponding composite membrane and application thereof

The invention discloses a preparation method of chitosan/montmorillonite nano composite hydrogel, belonging to the field of material chemistry. The preparation method comprises the following steps: mixing a KOH/LiOH.H2O/urea mixed solution with montmorillonite dispersion liquid to obtain the first mixed liquid; mixing the first mixed liquid with chitosan to obtain the second mixed liquid; freezing the second mixed liquid, and unfreezing to obtain a chitosan/montmorillonite nano mixed solution; centrifuging the chitosan/montmorillonite nano mixed solution; and treating in an ethyl acetate atmosphere to obtain the chitosan/montmorillonite nano composite hydrogel. The preparation method has the advantages of easiness in operation, stable technology and no toxicity or pollution and is suitable for large-batch industrial production. The invention also provides chitosan/montmorillonite nano composite hydrogel prepared by the method, which has the advantages of high compression strength, low swelling rate and good biocompatibility and degradability.

Chitosan/montmorillonite nano composite hydrogel and preparation method thereof

The invention discloses a lanthanum-nickel-codoped BaFe12O19 nano powder and a preparation method thereof and belongs to the technical field of wave-absorbing materials. The formula of the nano powder is Ba1-xLaxFe12-xNixO19, wherein 0</=x</=0.2. The lanthanum-nickel-codoped BaFe12O19 nano powder and the preparation method thereof have the advantages that the preparation method is high in yield, simple to operate and capable of achieving large-scale production easily, a co-precipitation method is used to prepare the lanthanum-nickel-codoped BaFe12O19 nano powder, and a practicable approach is provided for the large-scale production of the lanthanum-nickel-codoped BaFe12O19 nano powder; the prepared lanthanum-nickel-codoped BaFe12O19 nano powder is high in purity, small in particle size, applicable to the field of wave absorption and promising in prospect.

Lanthanum-nickel-codoped BaFe12O19 nano powder and preparation method thereof

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