5results about How to "Reversible" patented technology

The invention belongs to the technical field of functional materials, and discloses a preparation method and application of a photochromic fiber material.The method comprises the following steps that 1, furfural reacts with an electron acceptor to prepare a DASA precursor; step 2, adding the DASA precursor into dichloromethane to prepare a DASAs precursor solution, and then combining the DASAs precursor solution with an electron donor to prepare a photochromic compound DASAs; step 3, mixing DMF and PVDF particles according to a set proportion to prepare a PVDF precursor solution; step 4, mixing the DASAs and the PVDF precursor solution to prepare an electrostatic spinning solution; and 5, preparing the electrostatic spinning solution into a fiber material through an electrostatic spinning technology. The photochromic fiber prepared by the invention can realize efficient reversible color change within 10 seconds under visible light irradiation; the DASAs photochromic compound is directly embedded into the fiber, so that the problems that a color changing agent is non-uniform in dispersion and easy to fall off and the loading efficiency in a solid matrix is low in the prior art are solved, and the stability and the practicability of the material are remarkably improved.

A porous hollow spherical photonic crystal sensor for detecting xylene gas and a method thereof, comprising synthesizing PS@SiO2 core-shell colloids, assembling into spherical photonic crystals by microfluidics, calcining to remove the polystyrene inner core to form a hollow SiO2 structure, and introducing a porous structure by controllable chemical etching. Subsequently, functionalization is performed by using P(VBC-co-MMA) to obtain a porous hollow spherical photonic crystal sensor, which is endowed with strong molecular affinity for xylene, and selective gas adsorption of the porous photonic crystal is realized. Benefiting from the super-symmetrical spherical structure, the obtained photonic crystal sensor exhibits an inherent angle-independent optical response, overcoming the limitation of angle dependence of thin film photonic crystal sensors. Exposure to xylene gas shows a significant reversible red shift of the optical stop band and a clear color change, which is due to the increase of the effective refractive index caused by vapor diffusion and adsorption. By monitoring the movement of the optical stop band in air and saturated xylene, visual detection of xylene gas can be realized.

The utility model discloses a kind of multifunctional ecological revetment blocks for river regulation, belong to the technical field of hydraulic engineering construction, the block includes block body and wedge, block body four side surface structures are same, are equipped with tenon, mortise and half hole, when arbitrary two side surfaces are spliced, tenon is embedded mortise, vertical wedge hole is formed in its half hole alignment, when construction, first assemble block to form revetment level, then the conical frustum wedge of same material is driven into wedge hole, wedge uses its wedge effect to generate huge radial pressure, adjacent block is locked transversely, while its lower end is deeply into foundation, provide vertical anchoring force, the utility model realizes the " transverse locking, vertical anchoring " of revetment structure, integrality, stability and anti-collapse ability are very strong, and construction is convenient, ecological friendly, with very high popularization value.

The invention discloses a viologen-based lead halide photochromic semiconductor material and a synthesis method and application thereof, and belongs to the technical field of material preparation, the synthesis method comprises the following steps: mixing a lead source, 1-(4-sulfophenyl)-4, 5-diphenyl-1, 3-pentanedione and 1-(4-sulfophenyl)-4, 5-diphenyl-1, 3-pentanedione to obtain a mixture; the viologen-based lead halide photochromic semiconductor material is prepared by mixing 4, 4 '-dipyridyl (HPhSQ) with a solvent and carrying out a heating reaction under a closed condition. The solvent is prepared by uniformly mixing DMF (N, N-dimethylformamide), hydrochloric acid and water. The viologen-based lead halide photochromic semiconductor material provided by the invention has reversible photochromic properties (ultraviolet coloring and thermal fading), excellent photoelectric properties (enhancing photocurrent, inhibiting dark current and high detection sensitivity) and good thermal stability (greater than or equal to 200 DEG C); and the hydrothermal synthesis method is simple and convenient to operate, high in yield, high in product purity and crystallinity and suitable for large-scale preparation of high-performance photoelectric detectors.

This invention discloses a method for regulating β-amyloid protein aggregation based on circularly polarized light and its application. The method includes electrostatically binding an amino-modified upconversion luminescent nanoparticle to a SiO2-coated chiral optically active nanostructure to obtain an upconversion chiral nanomaterial; coating the surface of the upconversion chiral nanomaterial with a biocompatible coating and a brain-targeting ligand, then mixing it with β-amyloid protein, and targeting the region with 5–100 mW / cm² light. 2 Irradiation with an 800–1400 nm laser for 15–30 min excites upconversion chiral nanomaterials to emit circularly polarized light. This circularly polarized light inhibits the aggregation of β-amyloid protein by interfering with the formation of its β-sheet conformation. This invention utilizes circularly polarized light (CPL) to induce changes in key protein site interactions, thereby altering the conformation of protein aggregation. This process is reversible and highly spatially selective. Animal experiments have verified that this method can effectively block Aβ aggregation and improve cognitive function.