13results about How to "Improve light-to-heat conversion efficiency" patented technology

The application discloses a kind of hydrophilic photo-thermal covalent organic framework nanofiber materials and preparation method thereof, belong to photo-thermal material and seawater desalination field.For the technical problem that existing photo-thermal material is difficult to consider high efficient light absorption and fast water transport, first, homogeneous polymerization method is used, monomer containing sulfonic acid group and porphyrin monomer etc. occur polycondensation reaction in acetic acid aqueous solution, and the photo-thermal covalent organic framework dispersion is obtained by dialysis purification;Subsequently, the dispersion is freeze-dried, and the hydrophilic photo-thermal covalent organic framework nanofiber is obtained.The material uses porphyrin big π bond system as photo-thermal conversion core, and uses the rich sulfonic acid group and regular pore channel in framework to build efficient water transport network.The preparation process of the application is mild and controllable, and the obtained material has excellent broadband light absorption and hydrophilic ability, and has broad application prospect in the field of solar-driven interfacial seawater desalination.

The invention relates to the technical field of biomedical materials, in particular to a gadolinium oxide-based nano preparation as well as a preparation method and application thereof. The preparation method of the preparation comprises the following steps: preparing gadolinium oxide nanoparticles through a hydrothermal method and amination modification, and dissolving the gadolinium oxide nanoparticles in deionized water to obtain a contrast agent solution; dropwise adding the nano-particles into a gold source solution under stirring at a certain temperature to obtain nano-particles with core-shell structures; and finally, slowly adding the synthesized dispersant solution of the water-soluble polymer into the core-shell nanoparticle solution to obtain a gadolinium oxide-based nano preparation solution. And performing post-treatment such as dialysis, freeze drying and the like to obtain the core-shell structure nanoparticles based on the gadolinium oxide nano preparation. The invention relates to a gadolinium oxide-based nano preparation for cancer diagnosis and treatment, gadolinium oxide is used as an MRI contrast agent, and a gold shell is grown on the periphery of the gadolinium oxide as a photo-thermal preparation; the hydrogel has the characteristics of good biocompatibility and the like, and has an important practical prospect in the field of preparation of diagnosis and treatment integrated medicines.

This invention discloses a manganese dioxide nanozyme with photothermal and antibacterial functions and its preparation method, belonging to the field of biomedical materials technology. The invention first uses lactoferrin (LF) as a carrier template to synthesize manganese dioxide nanoparticles (LF-MnO2) with uniform particle size, high solubility, and high dispersibility via a one-step redox method. LF-MnO2 exhibits photothermal properties, achieving rapid heating and photothermal sterilization under near-infrared light irradiation. LF-MnO2 possesses various enzyme activities, including superoxide dismutase (SOD) and catalase (CAT), which can scavenge various oxygen free radicals. Furthermore, LF-MnO2 can efficiently catalyze the production of oxygen from hydrogen peroxide. The LF-MnO2 prepared by this invention has broad application prospects in photothermal antibacterial, antitumor, reactive oxygen species scavenging, and tissue regeneration and repair fields.

The application discloses a preparation method of a polyurea photo-thermal anti-icing coating and belongs to the technical field of photo-thermal anti-icing. The application is based on silica / polyurea composite particles and carbon materials, and super-hydrophobicity and relatively high photo-thermal conversion efficiency are obtained. The method is characterized in that silica nanoparticles are combined into polyurea molecules to form silica / polyurea composite particles; then the composite particles are combined with graphite microparticles and uniformly dispersed in polysiloxane, and a super-hydrophobic photo-thermal coating with excellent wear resistance and durability is developed. The coating surface has high photo-thermal conversion efficiency, can obviously increase temperature under the irradiation of sunlight, can delay the icing time and reduce the ice adhesion strength, and thus better anti-icing and de-icing effects are achieved.

This invention relates to the field of fiber technology and discloses an antibacterial and heat-insulating fiber based on thermal insulation materials and its preparation method. By surface-modifying inorganic antibacterial and heat-insulating hollow titanium dioxide microspheres with polythiophene and polybutadiene, an antibacterial and heat-insulating material with good antibacterial and heat-insulating properties is prepared. This material is then introduced into polypropylene chips along with a reactive quaternary ammonium salt antibacterial agent, methacryloyloxyethyltrimethylammonium chloride, and extruded via a melt reaction. The resulting fiber possesses both excellent heat insulation and long-lasting antibacterial properties, while also improving the fiber's comfort.

The application discloses a kind of based on photothermal filler and dynamic hydrogen bond material multiple self-repairing modified asphalt and preparation method thereof, belong to road engineering and material science technology field.The raw material of the multiple self-repairing modified asphalt based on photothermal filler and dynamic hydrogen bond material of the application includes by mass fraction:SBS modified asphalt 100 parts, photothermal filler 1-5 parts and dynamic hydrogen bond material 1-3 parts.The application aims to combine photothermal conversion mechanism and dynamic hydrogen bond self-repairing mechanism, accelerate the movement of asphalt and polymer molecular chain at crack, to improve the self-repairing ability of asphalt material, prolong the service life of asphalt pavement, and reduce the maintenance cost of asphalt pavement.The application solves the deficiency of traditional self-repairing asphalt in repair frequency, repair effect and repair durability, has excellent photothermal conversion efficiency and multiple self-repairing performance, and the repair efficiency does not appear obvious attenuation after multiple load damage-illumination repair cycle, can effectively restore mechanical properties, suitable for road construction and maintenance under different climate conditions.

A temperature-responsive water harvesting hydrogel and a preparation method thereof, the water harvesting hydrogel is composed of N-isopropyl acrylamide, N,N,N',N'-tetramethylene ethylenediamine, N,N-methylene bisacrylamide, polyethylene glycol, ammonium persulfate and black titanium dioxide. The temperature-responsive water harvesting hydrogel of the present application combines the adjustable pore size of hydrophilic polyethylene glycol, the temperature response characteristics of N-isopropyl acrylamide and the excellent light-heat conversion performance of black titanium dioxide nanoparticles, and can be used as an efficient solar "switch". The temperature-responsive water harvesting hydrogel of the present application has good ability to remove pollutants tetracycline in water and sterilization ability under sunlight; has excellent water harvesting capacity; can realize self water harvesting-release cycle, thereby significantly improving water use efficiency and reducing water resource waste.

This invention relates to a D-A-D structured NIR-II photothermal material, its preparation method, and its applications. Specifically, the photothermal material of this invention has a simple structure, is easy to synthesize, is easy to purify, and has a high yield. Furthermore, due to its large conjugated system, the molecular structure is stable and not easily degraded under NIR-II light irradiation. In addition, the photothermal material of this invention has excellent optical properties, good photothermal conversion efficiency, extremely low biotoxicity, and broad ultraviolet absorption in the 800-1000 nm range. Therefore, it has great application prospects in near-infrared photodynamic therapy and tumor treatment.

This invention belongs to the field of coating materials, specifically including an anti-fog coating, its preparation method, and its application. The raw materials for preparing the anti-fog coating specifically include the following components: photothermal nanoparticles, polyvinyl alcohol, phytic acid solution, glutaraldehyde solution, and deionized water in a ratio of 0.6 kg: 15 kg: 20 L: 10 L: 150 L. The photothermal nanoparticles are added to deionized water and ultrasonically dispersed to obtain a uniform nanoparticle suspension. Polyvinyl alcohol is added to this suspension, and the system is placed in a high-temperature water bath and magnetically stirred until completely dissolved. Then, an appropriate amount of phytic acid solution is added, and ultrasonically dispersed until the phytic acid is fully dissolved. Next, glutaraldehyde solution is added to the mixture, and magnetically stirred to allow the glutaraldehyde to fully react with the system components, obtaining a stable and dispersed coating. Finally, the coating is uniformly applied to the surface of a glass substrate and allowed to air dry naturally in a ventilated area. The resulting coating effectively inhibits the formation of fog droplets and accelerates the dissipation of existing fog droplets, while maintaining good light transmittance.

The invention relates to the technical field of photo-thermal composite materials, in particular to a hemostatic and antibacterial kaolin / molybdenum sulfide photo-thermal composite material and a preparation method and application thereof. The invention discloses a hemostatic and antibacterial kaolin / molybdenum sulfide photo-thermal composite material which comprises kaolin and metal 1T-phase MoS2 loaded on the kaolin. The preparation method comprises the following steps: dissolving a molybdenum source and a sulfur source in deionized water, adding kaolin, carrying out a hydrothermal reaction, centrifuging, washing, and drying to obtain the hemostatic and antibacterial kaolin / molybdenum sulfide photo-thermal composite material. According to the preparation method disclosed by the invention, the kaolin with a layered structure and surface charge characteristics is introduced, so that the molybdenum sulfide grows in situ between layers or on the surface of the kaolin body, controllable transformation of the molybdenum sulfide from a 2H phase to a 1T phase is realized, and the 1T molybdenum sulfide can stably exist, so that the composite material with high photo-thermal performance and temperature balance capability is obtained. Molybdenum sulfide is loaded on kaolin, so that the hemostatic performance of kaolin is further improved.

The application provides a kind of inkfish juice copper oxide-based nanocomposite, in this paper, inkfish juice (M) is as core, a layer of CuO is grown outside it, and M@CuO composite multifunctional nanomaterial is successfully constructed.M@CuO composite material is spherical, and the nanometer particle size is 128.2 nm, and it has good photo-thermal conversion performance (η T =47.6%) under near infrared light (NIR) irradiation conditions.In addition, M@CuO shows good Fenton effect at room temperature, and the Fenton reaction rate can be further improved by photo-thermal effect, and the Fenton reaction rate at 45 DEG C is more than twice that at 25 DEG C under the same conditions.In vitro cell experiments, M@CuO shows good biological safety, and under the effect of photo-thermal-chemical kinetics combined therapy, it can efficiently kill tumor cells, and provides an effective strategy for developing multifunctional nanomaterials with PTT-CDT combined therapy.

The present application relates to the field of photothermal materials, discloses a kind of photothermal coating preparation photothermal material composition and its application and photothermal composite film and its preparation method and application, the photothermal material composition contains chitosan, hydrophilic photothermal component and optional auxiliary, wherein, the content weight ratio of the chitosan, the hydrophilic photothermal component and optional auxiliary is 1:0.1-15:0-5, the photothermal composite film prepared by the photothermal material composition provided by the present application is strong, has higher light absorption rate, photothermal conversion efficiency and driving water evaporation rate.

The invention relates to the technical field of anti-counterfeit printing materials, and discloses a temperature change anti-counterfeit printing coating which comprises a bearing substrate, a functional layer group and a protective surface layer which are sequentially arranged from bottom to top, the bearing substrate is made of a material adaptive to a target application scene, and the material comprises any one of plastic, paper and metal; the functional layer group at least comprises a temperature change core layer, the temperature change core layer contains at least one thermochromic component, the thermochromic component is selected from a nano modified microencapsulated pigment, and the color change temperature precision of the temperature change core layer is less than or equal to + / -0.3 DEG C. According to the invention, environmental thermal disturbance is resisted in a targeted manner through differentiated structural design, namely, the cavity of the heat insulation layer in the eight-layer structural scheme and the heat insulation sheet work together, so that interference of external temperature fluctuation on the temperature change core layer can be isolated, and the response time is shortened by more than or equal to 50%; according to the five-layer structure scheme, the photothermal conversion efficiency is optimized through 8% of graphene / CNTs composite filler, and rapid conduction and uniform distribution of heat are achieved.