317results about How to "Improve light-to-heat conversion efficiency" patented technology

The invention relates to a PVA hydrogel-based photo-thermal evaporation material and preparation and application thereof. The preparation method comprises the following steps: step 1, respectively preparing an aqueous polyvinyl alcohol (PVA) solution, an aqueous nanometer photo-thermal material dispersion solution, an aqueous glutaraldehyde solution and a low-concentration hydrochloric acid solution; 2, fully mixing and stirring the aqueous PVA solution, the aqueous nanometer photo-thermal material dispersion solution, the aqueous glutaraldehyde solution and the low-concentration hydrochloricacid solution in the step 1 according to a certain sequence under a certain temperature condition; and 3, transferring the mixed and stirred product into a forming mold when the mixed and stirred product is not cured, and carrying out standing until a cross-linking reaction is complete, thereby obtaining the hydrogel material. The preparation method disclosed by the invention has the beneficial effects that preparation process is environment-friendly, pollution-free, simple and feasible; preparation cost is low; the obtained hydrogel can be used as an ideal photo-thermal evaporation and solarseawater desalination material; and the prepared hydrogel has high light absorption efficiency, photo-thermal conversion efficiency and evaporation efficiency, and can be applied to the field of solarseawater desalination.

The invention relates to a preparation method for polydopamine-coated polyethyleneimine-stablized gold-nanometer-star photothermal treatment agent. The preparation method comprises the following steps: preparing a gold seed solution from chloroauric acid and sodium citrate; activating mercaptoacetic acid with EDC, then adding an aqueous PEI solution and carrying out a reaction, dialysis, cooling and drying so as to obtain PEI-SH; adding dopamine hydrochloride into a Tris buffer so as to obtain dopamine Tris buffer; adding the gold seed solution into a chloroauric acid solution, adding a AgNO3 solution and an ascorbic acid solution under stirring, adding PEI-SH after stirring reaction and carrying out a reaction so as to obtain AuNSs-PEI; and adding AuNSs-PEI into the dopamine Tris buffer and carrying out stirring and centrifugation so as to obtain the photothermal treatment agent. The preparation method has the advantages of simplicity, mild reaction conditions, easy operation and industrialization prospects; and the prepared star-like nanometer agent has application potential in the fields of CT imaging diagnosis and photothermal treatment of cancers.

The present invention provides are a gold nanoflower structure and a preparation method therefor. The gold nanoflower structure is a gold nanoflower particle, with round-head columns being uniformly distributed at the periphery thereof, obtained by using gold octahedrons, gold balls or gold tetrahedrons as seed crystals and reducing chloroauric acid by using weak reductant in an environment of high-concentration polyvinylpyrrolidone. In addition, also provided in the present invention are a gold nanoflower/quantum dot composite probe for living cell immunofluorescent labeling and photothermal therapy, a preparation method therefor and a use thereof. In comparison with traditional probes, the probe, incorporates the features of photothermal therapy and fluorescent labeling, and is capable of killing cancer cells in an effective and directional way. Two light sources are adopted to bring a tremendous photothermal conversion efficiency and a greater enhancement on fluorescence intensity of quantum dots respectively, thus mutual interference of two effects are avoided tactfully. The coating of silicon dioxide averts the biotoxicity of the gold nanoflower and the quantum dot effectually, enabling the surface of the composite probe to be easily functionalized and also imparting an extraordinarily excellent biocompatibility to the composite probe.

The invention discloses a mesoporous polydopamine loaded manganese carbonyl multifunctional nano diagnosis and treatment agent and a preparation method and an application thereof. The multifunctionalnano diagnosis and treatment agent is a water-soluble mesoporous polydopamine carrier-coated hydrophobic manganese carbonyl drug, wherein the mass ratio of mesoporous polydopamine to manganese carbonyl is 1-8:1. The multifunctional nano diagnosis and treatment agent realizes gas and photo-thermal collaborative treatment under MRI and photoacoustic imaging guiding, is hopeful for increasing tumourtreatment effect, has good biocompatibility, and has clinical application potential.

The invention provides a cellulose/black phosphorus nanosheet composite hydrogel. The composite hydrogel comprises a cellulose three-dimensional network structure and black phosphorus nanosheets loaded in the cellulose three-dimensional network structure. The black phosphorus nanosheets can be stably loaded in the composite hydrogel system, and are not prone to agglomerate, and the composite hydrogel has the advantages of uniform, stable and high photothermal conversion efficiency, good compatibility with biological fluids, complete biodegradability and high biosafety, and can be used in biomedical field. The invention also provides a preparation method of the composite hydrogel.

The invention discloses a solar-powered water heating and heat-electricity converting device. The device comprises a water storage tank, a heat exchanger, a turbine, a fractional condensation unit and at least one evacuated tube collector connected in series/in parallel, wherein the water outlet of the evacuated tube collector is connected with the water inlet of the water storage tank; the water outlet of the water storage tank is connected with the hot side inlet of the heat exchanger; the hot side outlet of the heat exchanger is connected with the water inlet of the evacuated tube collector through a first circulating water pump; the cold side of the heat exchanger is connected with the turbine and the fractional condensation unit through a Kalina circulating secondary loop respectively; and the turbine is connected with an electric generator through a transmission case. The solar-powered water heating and heat-electricity converting device improves photo-thermal conversion efficiency and lowers system cost through the evacuated tube collector.

The invention relates to a MRI (magnetic resonance imaging)-guided targeted photo-thermal agent and a preparation method of a chemotherapeutic system of the MRI-guided targeted photo-thermal agent. The method comprises the following steps: by using a hydrothermal method, preparing superparamagnetic ferroferric oxide nano-particles on PEI modified MoS2 in an in-situ preparation mode, thus obtaining a PEI modified MoS2 nano composite; preparing polyethylene glycol coupled targeting molecules by using EDC chemical; by using an EDC chemical, connecting polyethylene glycol with the targeting molecules to the PEI modified MoS2 nano composite in a covalent linkage mode; and through physical adsorption, loading a micromolecular anti-tumor drug on a carrier. The method disclosed by the invention is easy to operate and simple in step, and the prepared multi-functional MoS2 nano composite is good in biological compatibility, can be specifically gathered at tumor sites so as to effectively kill tumor cells, and can effectively integrate early diagnosis and late treatment so as to realize the integration of diagnosis and treatment of cancer treatment.

The invention belongs to the technical field of micro robots, and particularly relates to a micro robot driven by a point light source. The micro robot is formed by assembling a photo-thermal conversion interface which is an oriented carbon nanotube and a flexible and transparent base prepared from polydimethylsiloxane; when a light spot is controlled to irradiate on the photo-thermal conversion interface, photo-thermal conversion is generated in the structure of the carbon nanotube, and the generated heat is conducted to a floating liquid surface where the whole micro robot floats along a vertical oriented structure of the carbon nanotube; according to the Marangoni effect, the surface tension of the heated liquid surface adjacent to the photo-thermal conversion interface is sharply reduced, and the surface tension difference is formed between the heated liquid surface and the surrounding non-heated liquid surface, so that asymmetric pushing force is generated on the whole micro robot, and the micro robot is driven to move on the liquid surface. The micro robot has relatively high environmental adaptability and high controllability, and by setting different light-driven response interface distribution and point light source movement tracks, micro wireless remote driving systems with different motion modes can be obtained according to actual application scenes.

The invention discloses a photo-thermal conversion material, which has a double-layer structure, wherein the double-layer structure is a polydopamine layer on a polyurethane sponge layer, the top layer of the double-layer structure is dark black, the thickness of the top layer is 0.5-2.0 mm, and the total thickness of the double-layer structure is 10-25 mm. The preparation method of the photo-thermal conversion material comprises: S1, purifying polyurethane sponge; S2, loading polydopamine: immersing the polyurethane sponge purified in the step S1 into a container filled with a hydrochloric acid-containing dopamine trihydroxymethyl aminomethane buffer solution (Tris-HCl buffer solution), and carrying out a water bath reaction for 4-24 h at a temperature of 25-80 DEG C without any disturbance condition and container sealing to obtain modified sponge; and S3, drying. The invention also provides applications of the photo-thermal conversion material. According to the invention, with the photo-thermal conversion material, the problems of low efficiency, high cost, complex process and the like of the existing solar steam photo-thermal conversion are solved.

The invention provides a black phosphorus-based hydrogel near-infrared immune drug controlled-release system. The system comprises an agarose hydrogel carrier as well as black phosphorus nanosheets and anti-cancer immune drugs carried in the agarose hydrogel carrier. The black phosphorus-based hydrogel near-infrared immune drug controlled-release system has near-infrared response, and can realize transformation from a gel state to a sol state through near-infrared light irradiation, so that locally controllable drug release can be achieved, and tumor cells in focus positions can be effectively killed; the system has a controllable degradation characteristic, and has extremely high clinical value for cancer treatment. The invention also provides a preparation method of the black phosphorus-based hydrogel near-infrared immune drug controlled-release system.

The invention discloses a hydrogel evaporation film, a preparation method and applications thereof. The hydrogel evaporation film comprises a hydrogel film matrix and carbon light absorption materials, wherein the carbon light absorption materials are uniformly distributed in the hydrogel film matrix, the light-absorbing carbon particles are uniformly dispersed in the hydrogel, and have a light absorptivity of more than 90% in the range from visible light to infrared light, the hydrogel has naturally formed multi-stage micro-nano holes, water is wrapped in the hydrogel to form pore channels communicated with one another, and the water can be conveyed from the bottom of the film to the evaporation side receiving sunlight.

The invention provides a preparation method of a PVP-modified sodium alginate/polydopamine composite nano-material. The preparation method is characterized by comprising the following steps: sprayingan aqueous solution containing sodium alginate and dopamine to a coagulating bath with pH 9-11 and containing polyvinylpyrrolidone (PVP), CaCl2 and trihydroxymethyl aminomethane, centrifuging and separating, and washing to obtain the PVP-modified sodium alginate/polydopamine composite nano-material. In vitro/in vivo biosecurity experiments and cancer therapy experiments prove that the PVP-modifiedsodium alginate/polydopamine composite nano-material has excellent biocompatibility, phototherapeutic ability and photothermal therapy and chemotherapy combined treatment ability.

A preparation method of a graphene/nanofiber hybrid gel membrane with a photo-thermal conversion function relates to a preparation method of a graphene/nanofiber hybrid gel membrane. The invention aims to solve the problem that existing photo-thermal conversion materials have low evaporation velocity and low photo-thermal conversion efficiency during the seawater desalination process. The preparation method comprises the following steps: 1, preparation of gel fiber; 2, preparation of graphene oxide sheets; and 3, preparation of the hybrid gel membrane. The preparation method is used for preparation of the graphene/nanofiber hybrid gel membrane with the photo-thermal conversion function.

The invention discloses a preparation method of a cobalt-doped zinc oxide/molybdenum disulfide nano composite antibacterial agent. The advantages of large specific surface area, high surface adsorption capacity and the like of molybdenum disulfide nanosheets are utilized; the preparation method comprises the steps: adsorbing bacteria to the surface of the molybdenum disulfide nanosheets, then cooperatively loading cobalt (Co) doped zinc oxide (ZnO) on the surface and between layers of the molybdenum disulfide nanosheets to play an efficient antibacterial role to kill the bacteria, and thus finally preparing the novel nano composite antibacterial agent with good biocompatibility and high antibacterial activity. The cobalt-doped ZnO quantum dot/molybdenum disulfide nano composite antibacterial agent prepared by the method has the advantages of good biocompatibility, strong broad-spectrum antibacterial effect and the like, and the minimum inhibitory concentration on escherichia coli can reach 0.25 mg/mL.

The invention discloses a solar thermal seawater desalination device, which comprises a light transmission condensation plate, an evaporation chamber and a collection chamber from top to bottom in order. The evaporation chamber is internally provided with a photothermal evaporation material, and the light transmission condensation plate covers the evaporation chamber and guides condensed water tothe collection chamber. The photothermal evaporation material comprises a heat insulator and a light absorber covering the outer surface of the heat insulator, the light absorber is vertically oriented graphene with the surface modified by a hydrophilic functional group, the heat insulator is graphene foam, and the vertically oriented graphene and graphene foam are connected by a covalent bond. The solar seawater desalination device provided by the invention has the characteristics of simple structure and easy operation, can collect condensed water efficiently, solves the light blocking problem of condensed water and steam, and improves the stability and photothermal conversion efficiency of the solar thermal seawater desalination system.

The invention relates to a preparation method of a chameleon bionic camouflage painting color-changing film. The preparation method comprises the following steps: adding thermo-sensitive macromolecular monomers, nano-metal particles, a surfactant, a cross-linking agent, an auxiliary initiator and an initiator into deionized water to mix to obtain a mixed solution; (2) pouring the mixed solution into a silicon dioxide photonic crystal template, standing until polymerization is finished, soaking the template into a hydrofluoric acid to obtain a reverse template, washing the reverse template in the deionized water repeatedly, and soaking the reverse template in the deionized water to obtain a thermo-sensitive macromolecular coupling nano-metal particle chameleon bionic film. Compared with the prior art, the preparation method of the chameleon bionic camouflage painting color-changing film has the advantage that the chameleon bionic camouflage painting color-changing film has sensitive color change correspondence on temperature, visible light and near-infrared light.

The invention provides a preparing method of near-infrared response carbon dots. The preparing method includes the following steps that trinitro-pyrene and a polyethyleneimine water solution are mixedevenly, and react for 1 min to 120 min in a microwave reactor at the temperature of 150 DEG C to 230 DEG C, and the reaction product is filtered, subjected to chromatography and dried, and the carbondots are obtained. The invention also relates to application of the near-infrared response carbon dots. The carbon dots for near-infrared-region photo-thermal treatment are prepared with the rapid and efficient microwave method, the carbon dots have the excellent photo-thermal conversion efficiency, and an in-vivo and in-vitro imaging aim is achieved by effectively combining the carbon dots and fluorescence-imaging small molecules; the carbon dots are combined with small molecule drug doxorubicin, the whole system has two treatment modes of photo-thermal treatment and chemotherapy, and through combination treatment, the treatment power is lower and has better safety and higher efficiency.

The invention discloses a phase-change composite material with a photo-thermal conversion function and a preparation method thereof, and belongs to the cross field of phase-change energy storage and energy conversion. The multifunctional phase change composite material is prepared by combining Ti2O3 nano particles with a heat storage phase change material for the first time, so that a photo-thermal conversion function is expected to be provided on the basis of phase-change heat storage and temperature control functions, and the carbon foam-based phase-change composite material which is is easy to cut and process, has a controllable appearance size, has light weight and flexibility, and has photo-thermal conversion performance is provided. Due to the three-dimensional porous carbon foam matrix of the phase change composite material, the phase-change material can be stably stored, and the storage capacity can be regulated and controlled. The phase-change composite material has excellent photo-thermal conversion and temperature adjusting functions and can be used in the aspects of heat energy storage and release, thermal insulation, photo-thermal conversion, infrared stealth and infrared decoy of military equipment, and the like.

The invention aims to provide a light-absorbing heat-insulating integrated photothermal evaporation material. The light-absorbing heat-insulating integrated photothermal evaporation material comprisesa heat-insulating body and a light-absorbing body covering the outer surface of the heat-insulating body; and the light-absorbing body is vertically-oriented graphene of which the surface is modifiedby a hydrophilic functional group, the heat-insulating body is graphene foam, and the vertically-oriented graphene is connected with the graphene foam through a covalent bond. The integrated photothermal evaporation material provided by the invention overcomes the problems of easy separation of a light-absorbing body and a heat-insulating body and heat loss caused by penetration of a liquid intothe heat-insulating body, improves stability and photothermal conversion efficiency of a local heating system, realizes fast and high-efficiency photothermal evaporation, has a simple preparation process, is easy to produce in a large scale, and can be applied to seawater desalination, sewage purification and high-temperature steam sterilization.

The invention discloses a preparation method of a membrane material for solar interface evaporation seawater desalination. The method comprises the following steps: dissolving PLA particles in a chloroform/N, N-dimethylformamide mixed solvent, then respectively adding PLA-g-HPC and Ti3C2Tx (MXene) nanosheets, stirring, carrying out ultrasonic treatment, and carrying out electrostatic spinning to obtain a PLA/PLA-HPC/MXene membrane. According to the invention, PLA-g-HPC is used as a dispersing agent and functional particles, Ti3C2Tx(MXene) nanosheets are introduced, and MXene is uniformly dispersed in the PLA/PLA-HPC/MXene membrane, so that the PLA/PLA-HPC/MXene membrane has very good photothermal conversion performance and mechanical stability; and the PLA/PLA-HPC/MXene membrane has a three-dimensional hierarchical porous structure, so that the PLA/PLA-HPC/MXene membrane has a relatively large specific surface area, water evaporation is facilitated, and the evaporation efficiency is improved.