84 results about "Carbon nanodots" patented technology

The invention discloses a preparation method of an environment-friendly degradable single-sided perspective sticker, and belongs to the technical field of modified nano materials. The method comprises the following steps: (1) preparation of a multi-layer composite structure: mixing polylactic acid and poly (butylene succinate), adding nano-montmorillonite and a surface modifier, and carrying out melt blending to form a first-layer melt; stirring poly (butylene adipate-co-terephthalate) and fluorescent carbon nanodots to form a second layer of melt; the first layer, the pressure-sensitive adhesive layer and the second layer are co-extruded and compounded to form a film blank. And (2) construction of the nano-film: biaxially stretching the film blank, imprinting a micropore array, dipping in the silver nanoparticle suspension, and drying to obtain the nano-film. And (3) coating functionalization treatment: immersing into a fluorine-containing nano coating solution, and curing. And (4) post-treatment: carrying out secondary curing. The obtained single-sided perspective sticker is suitable for the fields of buildings, vehicle privacy films and the like, and solves the problems of serious pollution and slow degradation of a traditional sticker.

The invention relates to a silicon-carbon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: carrying out thermal polymerization on a first carbon source to obtain soft carbon microspheres; carrying out spray coating, cooling curing and first heating activation on soft carbon microspheres, a second carbon source, graphite carbon nanodots and an activating agent, and then neutralizing and washing with acid to obtain a porous carbon sphere precursor; under an inert atmosphere, feeding a silicon source into the porous carbon sphere precursor, and carrying out secondary heating, so that the silicon source is cracked, and the silicon elementary substance is deposited and adsorbed in the porous carbon sphere to obtain a porous silicon carbon sphere; and heating the porous silicon carbon spheres, introducing an organic gas, and forming a carbon layer on the surfaces of the porous silicon carbon spheres to finally obtain the silicon carbon negative electrode material. After the obtained silicon-carbon negative electrode material is rolled by an external force, particle breakage caused by separation of the porous carbon spheres and the heterogeneous porous carbon layer can be avoided, and the structural strength of the silicon-carbon negative electrode material is improved, so that the capacity of a battery system is improved, and the cycle life of the battery system is prolonged.

The invention discloses berberine carbon nanodots as well as a preparation method and application thereof, and belongs to the technical field of biological medicines. The preparation method comprises the following steps: carrying out a hydrothermal reaction on a berberine aqueous solution, filtering, centrifuging and collecting the solution. The berberine is used as a unique carbon source, the high-fluorescence carbon nanodot is synthesized through a hydrothermal method, the method is simple, low in cost, safe and green, other chemical reagents do not need to be added, potential toxicity caused by other chemical substances is avoided, and the berberine carbon nanodot obtained through synthesis is small in size, has good water solubility, can penetrate through a cell membrane and can be used for preparing the high-fluorescence carbon nanodot. The compound provided by the invention is simple in preparation process and easy for intestinal tissue cell uptake, can significantly alleviate intestinal epithelial cell death and intestinal epithelial cell barrier permeability abnormity caused by LPS (lipopolysaccharide) by alleviating intestinal tissue pathological injury, inflammatory response and tight junction protein loss of sepsis mice, and is effectively applied to treatment of intestinal barrier injury caused by sepsis.

The invention discloses an N-doped carbon nanodot and application thereof in tinidazole detection, and belongs to the field of analysis and detection. The preparation method of the N-doped carbon nanodots comprises the following steps: mixing L-lysine, ethylenediamine and water to form a mixed solution, then carrying out a heating reaction, and purifying after the reaction is finished to obtain the N-doped carbon nanodots. According to the method, the carbon dots are prepared by taking L-lysine and ethidene diamine as precursors for the first time, quantitative detection of tinidazole is realized, and the method is low in cost, high in sensitivity and suitable for on-site rapid detection and has relatively high practical value and popularization prospect.

The present invention belongs to the technical field of new materials and the technical field of energy conservation and environmental protection. Disclosed are a carbon nanodot synthesized by using naturally withered leaves, and a preparation method therefor and an application thereof. In the method of the present invention, naturally withered leaves of camphor trees are used as a carbon source, and a carbon nanodot is obtained by means of drying, high-temperature calcination, ultrasonic oscillation, and centrifugal separation and purification. The method of the present invention is low-cost and environmentally friendly and involves a simple preparation process; and the prepared carbon nanodot can be used in the aspects of biological imaging, anti-counterfeiting, metal ion detection, etc., and has a good economic value and practicability.

The invention provides a red fluorescent carbon nanodot as well as a preparation method and application thereof. The preparation method of the red fluorescent carbon nanodot provided by the invention comprises the following steps: weighing 0.1-2.8 g of 1, 8-diaminonaphthalene solid, dissolving the 1, 8-diaminonaphthalene solid in 20mL of phosphoric acid, and magnetically stirring to dissolve the 1, 8-diaminonaphthalene solid; transferring the solution into a hydrothermal kettle, carrying out hydrothermal reaction for 6-26 hours under the condition of 120-300 DEG C, and cooling the reaction kettle to room temperature in a natural environment after heating is finished; purifying by using a column chromatography, and taking absolute ethyl alcohol as a washing solvent to obtain a pure carbon dot solution; and finally, evaporating the ethanol solvent by adopting a rotary evaporator, and drying to obtain pure carbon nanodot solid powder. The carbon dot solution can emit bright red fluorescence under the excitation of xenon lamp light with the wavelength of 380-550 nm. The method has a wide application prospect in the fields of time-resolved imaging, advanced information encryption, anti-counterfeiting and the like.

An improved nanocomposite There is provided a nanocomposite comprising a carbon nanodot (C-dot) and an enzyme, co-encapsulated in a metal-organic framework. There is also provided a method of forming the same.

The invention provides a composition for a light anti-reflection adhesive film, the light anti-reflection adhesive film, and a preparation method and application of the light anti-reflection adhesive film. The composition is prepared from the following components in parts by mass: 50 to 80 parts of grafted fluorescent carbon nanodots, 20 to 50 parts of POE (Polyolefin Elastomer) grafted particles, 0.5 to 10 parts of a surfactant, 2 to 3 parts of a silane coupling agent, 0.5 to 1 part of an antioxidant, 0.5 to 1 part of a curing agent and 0.5 to 1 part of a photoinitiator, the grafted fluorescent carbon nanodots comprise fluorescent carbon nanodots and polymer monomers grafted on the fluorescent carbon nanodots, the POE grafted particles comprise POE particles and silane substances grafted on the POE particles, and the polymer monomers and the silane substances can be combined through a cross-linking reaction; the grafted fluorescent carbon nanodots are used for converting incident light into emergent light, and the wavelength of the emergent light is larger than that of the incident light. The grafted fluorescent carbon nanodots and the POE grafted particles are crosslinked to form an optical path in the light anti-reflection adhesive film, so that the conversion rate of the light anti-reflection adhesive film for converting ultraviolet light into visible light is improved, and the damage of the ultraviolet light to a battery is reduced.

The invention belongs to the field of battery materials, and discloses a porous carbon material prepared through in-situ crosslinking-curvature induction and a method and application thereof, and the preparation method specifically comprises the following steps: mixing biomass powder with a solution containing acrylate groups, carrying out a hydrothermal reaction to obtain a carbon nanodot suspension, and carrying out rotary evaporation to obtain carbon nanodot powder; performing ultraviolet irradiation on the carbon nanodot powder; dispersing the irradiated carbon nanodot powder in a solvent to form a suspension, placing the suspension in an external field device for curvature induction, and separating, cleaning and drying the induced carbon nanodots to obtain a porous carbon precursor; calcining the porous carbon precursor, and then pickling and drying to obtain the porous carbon material. The porous carbon material has a snake-like squamous structure, the unique structure provides a buffer space for volume expansion of silicon particles in the charging process, stress can be effectively dispersed, mechanical damage caused by volume expansion is reduced, and the cycling stability of the material is improved.

The invention discloses a preparation method and application of lithospermum carbon nanodots with an anti-adrenal cortical carcinoma function, and relates to the field of carbon dots, the lithospermum carbon nanodots are prepared by the following steps: mixing a lithospermum extract and deionized water, and carrying out a hydrothermal reaction to obtain a lithospermum carbon dot aqueous solution; the lithospermum carbon nanodots are used for preparing medicines for resisting adrenal cortex cancer. The lithospermum carbon nanodot provided by the invention has an inhibition effect on proliferation of adrenal cortex cancer cells, especially on the adrenal cortex cancer cells ACHN and 769-P. The lithospermum carbon nanodot disclosed by the invention has a remarkable proliferation inhibition effect on ACC (adrenal cortical carcinoma) cells. The adrenal cortex cancer is a rare and malignant tumor, and traditional treatment methods such as surgery and chemotherapy have certain limitations. Therefore, the development of a new targeted therapy strategy is very important. The lithospermum carbon nanodots can effectively inhibit proliferation of adrenal cortex cancer cells such as ACHN and 769-P through a certain molecular mechanism.

The application relates to a silicon-carbon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: obtaining soft carbon microspheres by using a first carbon source for thermal polymerization; performing spray coating of the soft carbon microspheres, a second carbon source, graphite carbon nanodots and an activating agent, cooling and solidifying, first heating and activating, then neutralizing with an acid and washing to obtain a porous carbon sphere precursor; under an inert atmosphere, feeding a silicon source into the porous carbon sphere precursor and performing second heating, so that the silicon source is cracked and elemental silicon is deposited and adsorbed inside the porous carbon sphere to obtain a porous silicon-carbon sphere; heating and warming the porous silicon-carbon sphere and feeding an organic gas to form a carbon layer on the surface of the porous silicon-carbon sphere, and finally obtaining the silicon-carbon negative electrode material. The obtained silicon-carbon negative electrode material can avoid separation of the porous carbon sphere and the homogeneous porous carbon layer after external force roller pressing, can prevent particle breakage, can improve the structural strength of the silicon-carbon negative electrode material, and can further improve the capacity of a battery system and the cycle life.

The invention discloses application of selaginella tamariscina carbon nanodots with anti-inflammatory, anti-dermatitis and skin-care functions, and relates to the field of carbon dots. The preparation method of the selaginella tamariscina extract carbon nanodots comprises the following steps: mixing a selaginella tamariscina extract with deionized water to obtain a selaginella tamariscina aqueous solution; putting the mixture into an autoclave with a polytetrafluoroethylene lining, keeping for 5-7 hours at the temperature of 160-180 DEG C, cooling, centrifuging and filtering to obtain the selaginella tamariscina extract carbon nanodots. The carbon nanodots are used for preparing medicines for resisting inflammation and atopic dermatitis and preparing skin care products.

The invention discloses a carbon nanodot as well as a preparation method and application thereof, and relates to the technical field of carbon nanomaterials. The carbon nanodots are prepared from raw materials including nicotinamide, urea and citric acid or a derivative thereof through solvent heat treatment, and the derivative of the citric acid is selected from citrate, a citric acid hydrate or a hydrate of the citrate. According to the invention, nicotinamide is used as a precursor to synthesize the carbon nanodot under solvent heat treatment, so that the carbon nanodot integrates intrinsic biological activity, efficient photothermal conversion capability and red fluorescence imaging function at the same time, and the limitation of a single therapy is overcome through multifunctional synergistic therapy. In addition, the carbon nanodot provided by the invention has extremely high biological safety.

The invention relates to the field of carbon nanomaterials, and particularly discloses a preparation and storage method and application of near-infrared super carbon nanodots. The invention provides a preparation method of super carbon nanodots, which comprises the following steps: carrying out primary assembly by standing a carbon nanodot solution at normal temperature for a preset period of time, and then carrying out secondary assembly under low-temperature, dry and sealed conditions, thereby obtaining the super carbon nanodots. The light absorption range of the super carbon nanodots prepared by the method approaches to a near-infrared region, the light absorption wave band is greatly widened, and the super carbon nanodots show potential application value in the medical field. Compared with the prior art, the preparation method provided by the invention can be used for successfully preparing in a dry environment, and the dependence on a water medium in a traditional method is abandoned. Meanwhile, the super carbon nanodot prepared by the invention has the capability of being stored for a long time in an aqueous solution or dry state under a low-temperature condition; wherein when stored in a dry state, the structural stability and the performance integrity of the composite material can be more effectively maintained, and the effective storage life of the composite material is prolonged.

The present invention relates to the technical field of biomedical materials, and in particular to an experimental method for analyzing the assembly mechanism of carbon nanodots. The present invention discloses an experimental method for analyzing the assembly mechanism of carbon nanodots, comprising the steps of: (1) adding carbon nanodot assemblies to buffer systems of different pH values, molecular structures, and ionic strengths; (2) observing and recording the color change of the carbon nanodot assemblies, the position shift of the characteristic absorption peak of the ultraviolet-visible spectroscopic spectrum, and the change in the absorbance value of the characteristic absorption peak of the ultraviolet-visible spectroscopic spectrum; (3) analyzing the dissociation state of acidic functional groups and basic functional groups in different buffer systems using a pH calculation formula; (4) analyzing the depolymerization process of the carbon nanodot assemblies in combination with step (2) and step (3), and analyzing the assembly mechanism. The experimental and analytical methods designed by the present invention can be used to clarify the assembly mechanism of carbon nanodot assemblies constructed based on hydrogen bonds.

The present invention relates to the use of carbon nanodots to treat wastewater. Specifically, the invention relates to the use of carbon nanodots for improving the efficiency of microorganism-mediate

The application provides a carbon nanodot-based temperature sensor and a preparation method thereof. The carbon nanodot-based temperature sensor comprises, from bottom to top, a substrate layer, an interdigital electrode layer and a sensing layer. The sensing layer comprises hydrophilic carbon nanodot particles and an ionic salt. The sensing layer is formed by drop coating of a mixed aqueous solution of the hydrophilic carbon nanodot particles and the ionic salt. The preparation method is simple and easy to implement, and has low cost. The prepared temperature sensor has high sensitivity, high precision and high stability. The sensitivity of the temperature sensor reaches 345951.8%℃ ‑1 .

The present invention discloses a method for detecting thiourea using carbon nanodots and gold nanoparticles as fluorescent probes, which belongs to the field of analytical detection. The technical solution of the present invention is: fluorescent carbon nanodots are mixed with gold nanoparticles in advance, and the fluorescence of the carbon nanodots will be quenched based on the fluorescence resonance energy transfer effect; then, if thiourea is present in the sample to be tested mixed with the probe, the thiourea will trigger the aggregation of gold nanoparticles through coordination and decombinate the carbon nanodots from the gold nanoparticles, and finally restore the quenched fluorescence of the carbon nanodots. Under the optimized detection conditions, the relative fluorescence intensity of the carbon nanodot-gold nanoparticle probe shows a good linear relationship with the thiourea concentration in the range of 0.05-1μM, and the detection limit (S / N=3) is 0.0362μM. The detection method established by the present invention is not only convenient, but also has excellent selectivity and sensitivity, and can be effectively applied to the detection of thiourea in tap water, lake water and fruit and vegetable juice.

This invention discloses a type of N-doped carbon nanodots and their application in the detection of tinidazole, belonging to the field of analytical detection. The preparation method of the N-doped carbon nanodots in this invention is as follows: L-lysine, ethylenediamine, and water are mixed to form a mixture, which is then heated to react. After the reaction, the N-doped carbon nanodots are purified. This invention is the first to use L-lysine and ethylenediamine as precursors to prepare carbon nanodots and achieve quantitative detection of tinidazole. It is low-cost, highly sensitive, and suitable for rapid on-site detection, possessing high practical value and promising prospects for widespread application.

The invention discloses a BiCuSeO carbon nanodot composite thermoelectric material and a preparation method thereof. The method comprises the following steps: step 1, synthesizing carbon nanodots; step 2, in-situ synthesis of the BiCuSeO / carbon nanodots is carried out; 3, spark plasma sintering of the BiCuSeO / carbon nanodot composite powder is carried out, and the BiCuSeO / carbon nanodot composite thermoelectric material is obtained.BiCuSeO serves as a matrix, N-CDs nanophase is introduced, the carbon dots have the electron transfer property, the surfaces of the carbon dots contain a large number of holes and electrons, the carbon dots can serve as electron donors and electron acceptors at the same time, and therefore the efficiency of the thermoelectric material is improved; and an electron transfer phenomenon occurs under a proper condition, so that the N-CDs are dispersed and distributed at the grain boundary of the BiCuSeO parent phase to greatly improve the electrical transport performance, and meanwhile, a relatively large Seebeck coefficient is maintained, so that the thermoelectric performance is improved.

The invention relates to the technical field of explosive detection, and discloses a carbon nanodot fluorescent waveguide and a preparation method and application thereof. The method comprises the following steps: (1) activating the waveguide; (2) treating the waveguide obtained in the step (1) with amino silane to obtain an amino-modified waveguide; (3) treating the amino-modified waveguide with acyl chloride to obtain an acyl chloride-modified waveguide; and (4) carrying out pretreatment on carbon nanodots, and loading the pretreated carbon nanodots onto the acyl chloride modified waveguide to obtain the carbon nanodot fluorescent waveguide. According to the carbon nanodot fluorescent waveguide prepared by the method disclosed by the invention, the carbon nanodots can be stably attached to the waveguide, and accurate detection of nitro explosives is realized.

This invention discloses the application of turmeric carbon nanodots in the control of wheat scab. The application of turmeric carbon nanodots in the control of wheat scab was carried out under natural light irradiation conditions. The turmeric carbon nanodots were prepared by a method comprising the following steps: 1) taking turmeric powder and drying it for later use; 2) subjecting the system of the turmeric powder and solvent to a hydrothermal reaction, centrifuging after the reaction, and collecting the supernatant; 3) purifying the supernatant and drying it to obtain the turmeric carbon nanodots. This invention uses the naturally occurring herbaceous plant turmeric as a precursor and combines it with carbon nanodot technology to prepare turmeric CDs. Turmeric is widely available and easy to obtain. The prepared turmeric CDs have excellent antibacterial ability against Fusarium graminearum spores and a good control effect on wheat scab, without adversely affecting the growth of wheat seedlings. It is expected to be an ideal agricultural green fungicide with great market application prospects.

The present disclosure relates to injectable, aligneable and electroconductive hydrogel-carbon nanodots nanocomposite materials specifically designed to elicit key cellular functions relevant to in vitro, in vivo and clinical applications, such as neurogenic differentiation of eukaryotic stem cells and their electrophysiological maturation. The nanocomposites uniquely provide distinctive benefits attractive for both pre-clinical and clinical research, such as the potential to use various medically approved hydrogels, the ability to direct neurogenesis without exogenous factors, the capacity to support robust and directional axonal growth while eliciting the functional maturation of neurons through enhanced firing and a more active network activity, the potential for the in vitro and vivo assembly of 3D constructs of variable geometries to create specific architectures and / or follow specific anatomical trajectories, the facile integration of supplemental functions (e.g. drug release), ease of manufacturing and storage.

This invention discloses carbon nanodots, their preparation method, and their applications, relating to the field of carbon nanomaterials technology. The carbon nanodots are prepared by solvothermal treatment of nicotinamide, urea, and citric acid or its derivatives. The citric acid derivative is selected from citrate, citric acid hydrate, or citrate hydrate. This invention synthesizes carbon nanodots using nicotinamide as a precursor under solvothermal treatment, simultaneously integrating intrinsic bioactivity, efficient photothermal conversion capability, and red fluorescence imaging function. This multifunctional synergistic therapy overcomes the limitations of single-therapy approaches. Furthermore, the carbon nanodots provided by this invention exhibit extremely high biocompatibility.

The invention discloses application of a coptis extract carbon dot, relates to the field of carbon dots, and particularly relates to application of the coptis extract carbon dot in preparation of a medicinal preparation for inhibiting human fibrosarcoma cells and / or repairing and brightening. According to the invention, the coptis chinensis extract is used as a carbon source, and the ultra-small-size coptis chinensis extract carbon nanodots are synthesized by adopting a hydrothermal method. The rhizoma coptidis paste extract carbon dots disclosed by the invention can inhibit the generation of melanin to play a whitening role, and have the effects of inhibiting the proliferation of human fibrosarcoma HT-1080 cells and promoting the apoptosis of the HT-1080 cells.

The invention relates to an anti-counterfeiting food packaging film formed by compounding carbon dots and natural pigments and a preparation method of the anti-counterfeiting food packaging film, and belongs to the technical field of food packaging materials. The composite film adopts a biomass substrate and comprises polyvinyl alcohol and carboxymethyl cellulose, a film forming method is a solution casting method, and natural pigments are added through a direct mixing method in the film forming process. The food packaging film can be endowed with different colors and properties (such as pH sensitivity) by adjusting the variety (combination of single or multiple pigments) and concentration of the natural pigments. Furthermore, carbon dots (including carbon quantum dots, carbon nanodots, graphene quantum dots, carbonized polymer dots and the like) are compounded with the biomass substrate film, the packaging film with the anti-counterfeiting function is provided, and a simple and feasible anti-counterfeiting mode is established. A novel green anti-counterfeiting packaging film material is provided for the food packaging industry, and the attractiveness and functionality of food packaging can be effectively improved.

The application discloses a preparation method of an environment-friendly degradable single-side perspective sticker and belongs to the technical field of modified nanometer materials. The method comprises the following steps: (1) preparation of a multilayer composite structure: mixing polylactic acid and polybutylene succinate, adding nano-montmorillonite and a surface modifier to melt blend to form a first layer melt; stirring polybutylene adipate terephthalate and fluorescent carbon nanodots to form a second layer melt; and forming a film blank by co-extruding the first layer, a pressure-sensitive adhesive layer and the second layer; (2) construction of a nanometer film: biaxially stretching the film blank, pressing a micropore array, immersing in a silver nanoparticle suspension and drying to obtain a nanometer film; (3) functionalization treatment of a coating layer: immersing in a fluorine-containing nanometer coating solution and solidifying; and (4) post-treatment: secondary solidification. The obtained single-side perspective sticker is suitable for fields such as building and vehicle privacy films, and solves the problems of large pollution and slow degradation of traditional stickers.

The present application discloses a method for preparing pulp by dissociating straw fibers catalyzed by iron-manganese oxide cerium / carbon nanodots, the pulp and its application; the pulping method includes: S1: obtaining straw bundles by splitting straw; S2: dispersing iron-manganese oxide cerium / carbon nanodots in ethanol, adding water, then spraying the surface of the straw bundles, impregnating and catalyzing the reaction for 24 to 48 h to obtain dissociated straw products, adding sodium hydroxide, steaming at 120 to 160 °C for 15 to 30 min, and then performing straw homogenization treatment to obtain fibrillated fiber pulp; this method can effectively weaken the rigid strength of straw fiber polymers, enhance the bond breaking and plasticity of the macromolecular chains of straw fibers, reduce the energy consumption of mechanical disk milling and homogenization dissociation pulping of straw fibers, has high environmental safety, and the obtained pulp can be applied to the preparation of straw products such as straw substrate blocks, straw mulch films, straw seedling containers, and straw trays.

The invention provides a water-soluble soldering paste and a preparation method thereof, and belongs to the technical field of soldering pastes.The soldering paste is prepared from, by mass, 70-75% of alloy powder, 9-13% of conductive adhesive, 11-14% of scaling powder and 3-5% of other additives. The preparation method comprises the following steps: firstly, primarily mixing alloy powder and a conductive adhesive for 10 minutes, and then carrying out ball milling for 2.5 hours by using a ball mill at the rotating speed of 200rpm to obtain mixed powder; and the scaling powder and other additives are added into the mixed powder, stirring is conducted for 15 min through a stirring machine, then vacuum stirring is conducted for 20 min at the room temperature, bubbles in the materials are removed, and the water-soluble soldering paste is obtained. By adding the cobalt and the carbon nanodots, the wettability, the continuous printing stability, the welding spot mechanical strength and the thixotropic property of the water-soluble soldering paste are improved.

This invention discloses a carbon nanodot with H-aggregation properties, its preparation method, and its applications. Citric acid, p-phenylenediamine, and sodium hydroxide are dissolved in deionized water and stirred until fully dissolved to obtain a mixed solution A. Mixed solution A is then placed in a reaction vessel for a hydrothermal reaction to obtain product B. Finally, product B is naturally cooled and dialyzed to obtain carbon nanodots with H-aggregation properties. The carbon nanodots prepared by this invention are non-toxic, harmless, and can be stored for a long time. The fluorescence intensity and carrier lifetime can be controlled by concentration, making them suitable for photocatalysis.