14 results about "Layer by layer self assembly" patented technology

The invention belongs to the technical field of super-hydrophobic coatings, and particularly relates to a thermochromic photo-thermal super-hydrophobic coating and a preparation method and application thereof. The thermochromic photo-thermal super-hydrophobic coating sequentially comprises a photo-thermal epoxy bottom layer, a thermochromic epoxy middle layer and a super-hydrophobic surface layer from bottom to top in the thickness direction. Wherein phase change microcapsules for packaging phase change materials are distributed in the photo-thermal epoxy bottom layer, and the surfaces of the phase change microcapsules are modified with polydopamine layers and MXene layers in a layer-by-layer self-assembly mode; thermochromic microcapsules are distributed in the thermochromic epoxy middle layer; the super-hydrophobic surface layer is of a micro / nano structure formed by a silane derivative. Through the multifunctional design of integrating photothermal conversion, phase change and thermochromism mechanisms, all-weather ice resistance / ice removal is achieved, the energy utilization efficiency is optimized through an intelligent temperature control mechanism, and a sustainable solution is provided for surface ice prevention in an extreme environment.

The invention discloses nano-enzyme coating recombinant probiotics as well as a preparation method and application thereof, and belongs to the technical field of biotechnology and nano medicine. According to the invention, engineered Escherichia coli Nissle 1917 (ECN (DE3)) is taken as a host, and glutathione peroxidase (GPX) and glutathione reductase (GR) genes are over-expressed through a genetic engineering means, so that an efficient antioxidant enzyme system is constructed. And sequentially modifying chitosan and cerium dioxide nano-enzyme (CNP) on the surfaces of the thalli by using an electrostatic layer-by-layer self-assembly technology to form a protective coating. The nano-enzyme coating significantly improves the survival rate of the recombinant probiotics in severe environments such as simulated gastric acid (pH 2.5) and bile salt (0.3%), and enhances the ability of the recombinant probiotics to remove reactive oxygen species (ROS), including hydrogen peroxide, superoxide anions, hydroxyl free radicals and DPPH free radicals.

The invention discloses an SERS (Surface Enhanced Raman Scattering) flexible sensor based on dual-ion modification as well as a preparation method and application of the SERS flexible sensor, and belongs to the technical field of biomedical detection. A bacterial cellulose membrane (BCM) is used as a base material, cation modification (QBCM) is carried out through glycidyl trimethyl ammonium chloride (EPTMAC), anion modification (TABCM) is carried out through tannic acid (TA), a functional substrate with asymmetric charge distribution and a porous structure is constructed, then Ag NPs are loaded on the modified base material through an in-situ reduction method, the QBCM-coated AgNPs and TABCM-coated AgNPs dual-ion active substrate is formed, and the AgNPs / TABCM-coated AgNPs dual-ion active substrate is used for preparing the composite material. The SERS flexible sensor is integrated through a layer-by-layer self-assembly (LbL) technology; the SERS flexible sensor can realize specific enrichment and synchronous detection of anionic kynurenic acid (KYNA) and cationic spermine (Spm) in urine, and is low in detection limit and good in reproducibility.

The application discloses a sea fennel composite intelligent microcapsule based on sequential cross-linking, a preparation method and application, and belongs to the technical field of biomedicine.The application provides the sea fennel composite intelligent microcapsule based on sequential cross-linking, aiming at the problems of chemical instability, low transdermal rate, lack of environmental responsiveness of sea fennel extract, and loose capsule wall structure of existing microencapsulation technology, and incapability of precise control.Through integration of high-controllable technologies such as microfluidic layer-by-layer self-assembly, isothermal titration calorimetry monitoring cross-linking and atomic force microscope-nano indentation characterization, three-step sequential cross-linking is adopted to construct the intelligent microcapsule which is uniform in structure, excellent in mechanical performance, has a precise pH response threshold, realizes mild and efficient encapsulation of active substances, actively senses the skin barrier state and precisely controls the release, and synergistically enhances the mechanical strength and processing resistance, thereby providing a carrier solution with high technical barriers for high-end functional cosmetics.

The application relates to the fields of material technology and instrument science, and discloses a preparation method of a graphene-based water-oxygen barrier film and the graphene-based water-oxygen barrier film. The graphene-based water-oxygen barrier film is prepared by combining an initiated chemical vapor deposition (iCVD) technology with a layer-by-layer self-assembly (LBL) technology, realizing high-quality transfer of graphene and in-situ construction of inorganic nanosheets, and having high barrier property, high light transmittance and good flexibility. By using the application, the problems of interface pollution and damage caused by traditional wet transfer in the preparation of the graphene-based barrier film, weak interlayer coupling and short penetration path in the subsequent multilayer stacking can be solved.

The invention discloses pancreas islet-like sphere injectable hydrogel based on double-sequence packaging as well as preparation and application of the pancreas islet-like sphere injectable hydrogel, and belongs to the technical field of bioengineering medical materials. According to the preparation method, a high polymer material with positive and negative charges is self-assembled layer by layer in an electrostatic adsorption manner to form a pancreas islet beta cell immune protection film, and then the pancreas islet beta cell immune protection film is prepared by using the characteristic of temperature sensitivity of a spleen extracellular matrix, namely the characteristic of self-assembling into a nanofiber gel structure at an in-vitro liquid state and an in-vivo physiological temperature. The injectable pancreatic islet-like sphere hydrogel is prepared by using a nano-fiber as a template, so that the stability of the hydrogel structure is ensured, the hydrogel is assembled into a nano-fiber three-dimensional gel structure in vivo, a natural specific microenvironment is provided for self-renewal and differentiation of cells, beta cells are promoted to be gathered into pancreatic islet-like spheres, and the insulin secretion and vascularization capability are enhanced. The gelatin and the alginate are self-assembled layer by layer to form an immune protection film on the surface of the pancreatic beta cell, so that beta cell immune protection encapsulation is realized.

This invention relates to a novel manganese-based dual-ligand metal-organic framework low-temperature denitration catalyst (TEOS&Mn-BTC) and its preparation method. The catalyst forms a hollow, sea urchin-like microsphere structure through layer-by-layer self-assembly of dual ligands. Dual-ligand coordination exposes more structural defects in the catalyst, improving electron transport efficiency, increasing electron transport channels and active sites, and also generating an electron-metal-support coordination structure that enhances denitration activity and thermal stability by constructing Si-O-Mn bonds. Simultaneously, the sea urchin-like nanostructure improves electron transfer efficiency, enhances effective contact between the adsorbate and active sites, shortens mass transfer distance, and promotes the formation of hierarchical porous structures. While dual-ligand coordination enhances denitration activity by regulating electronic structure and morphology, the oxidizing power is not enhanced enough to oxidize NH3 to N2O. This catalyst overcomes the seesaw effect between denitration activity and N2 selectivity, while also ensuring good water and sulfur resistance, showing broad prospects in the field of low-temperature selective catalytic denitration.

The present application belongs to the technical field of super-hydrophobic coating, and particularly relates to a thermochromic photo-thermal super-hydrophobic coating, a preparation method and application thereof. The thermochromic photo-thermal super-hydrophobic coating comprises, from bottom to top along the thickness direction, a photo-thermal epoxy bottom layer, a thermochromic epoxy intermediate layer and a super-hydrophobic surface layer. The photo-thermal epoxy bottom layer is distributed with phase change microcapsules encapsulating phase change materials, and the surface of the phase change microcapsules is sequentially self-assembled with a polydopamine layer and a MXene layer. The thermochromic epoxy intermediate layer is distributed with thermochromic microcapsules. The super-hydrophobic surface layer is a micro / nano structure formed by a silane derivative. The present application realizes all-weather anti-icing / de-icing through the multifunctional design of integrating photo-thermal conversion, phase change and thermochromic mechanisms, optimizes the energy utilization efficiency through the intelligent temperature control mechanism, and provides a sustainable solution for surface anti-icing in extreme environments.

The invention discloses a preparation method of a flexible pressure sensing film, which comprises the following steps: mixing dandelion modified cellulose nanofiber dispersion liquid with single-layer graphene dispersion liquid, and stirring at room temperature to obtain a uniform blended solution; and filtering the blended solution through a vacuum filtration method, and obtaining the flexible pressure sensing film through a layer-by-layer self-assembly mode. The flexible pressure sensing film prepared by the invention has high sensitivity, can generate obvious resistance change under small pressure change, and realizes accurate detection of small pressure signals. And meanwhile, the device has quick response and recovery capability, real-time monitoring of dynamic pressure change is facilitated, and the performance stability of the device under the conditions of high-frequency operation and quick loading is improved. The pressure sensing film shows a wide detection range, can maintain good linear response characteristics in low-pressure and high-pressure intervals, effectively overcomes the problems that a traditional flexible pressure sensor is narrow in detection range and easy to saturate, and expands application scenarios.

A method of manufacturing an article is described, the method comprising providing a substrate; applying the primer layer to the substrate; wherein the primer layer comprises the reaction product of a polymerizable resin comprising at least one monomer having at least two ethylenically unsaturated groups; and applying a plurality of layers deposited by layer-by-layer self-assembly to the primer layer. Described is an article comprising a substrate; a primer layer disposed on the substrate; wherein the primer layer comprises the reaction product of a polymerizable resin comprising at least one monomer having at least two ethylenically unsaturated groups; and an ionically bonded polymer matrix disposed on the primer layer.

Provided is a method for manufacturing a lithium-sulfur battery cathode by using a fabric material, comprising the steps of: carbonizing a fabric material through heat treatment to manufacture a conductive support; electroplating a conductive metal material on the conductive support; loading, on the electroplated conductive support, a slurry comprising a sulfur polymer and a first carbon material replaced with a first functional group capable of hydrogen bonding to the sulfur polymer; and forming a capping layer by loading, on the conductive support, a second carbon material replaced with a second functional group capable of layer-by-layer self-assembling with the first carbon material.

The present disclosure provides a coated structured article. The article includes a substrate having a structured major surface including features, where the structured major surface includes raised and / or recessed features. The article also includes a coating disposed on at least a portion of the feature, the coating including a first material and a second material. The first material has a first binding group and the second material has a second binding group, and the first binding group and the second binding group have complementary interactions. A method of manufacturing an article is also disclosed. The method includes depositing a layer using layer-by-layer self-assembly to form a coating on a structured substrate.

The application discloses an injectable hydrogel of islet-like spheroids based on double sequential encapsulation and a preparation and application thereof, and belongs to the technical field of bioengineering medical materials. The preparation method utilizes the positive and negative charges of a polymer material, forms an immune protection film of islet beta cells through electrostatic adsorption layer-by-layer self-assembly, and utilizes the extracellular matrix of a spleen, i.e., the characteristics of a liquid state in vitro and self-assembly into a nanofiber gel structure at a physiological temperature in vivo, to prepare the injectable hydrogel of islet-like spheroids, so as to ensure the stability of the hydrogel structure, self-assembly into a nanofiber three-dimensional gel structure in vivo, provide a natural specific microenvironment for cell self-renewal and differentiation, promote the aggregation of beta cells into islet-like spheroids, and enhance the insulin secretion and vascularization capacity. The immune protection film is formed on the surface of the islet beta cells through layer-by-layer self-assembly of gelatin and alginate, so that the beta cell immune protection encapsulation is realized.

The invention relates to the field of material technology and instrument science, and discloses a preparation method of a graphene-based water-oxygen barrier film and the graphene-based water-oxygen barrier film, high-quality transfer of graphene and in-situ construction of inorganic nanosheets are realized through mutual combination of an initiation chemical vapor deposition (iCVD) technology and a layer-by-layer self-assembly (LBL) technology, and the graphene-based water-oxygen barrier film is prepared. Therefore, the water-oxygen barrier film with high barrier property, high light transmittance and good flexibility is prepared. By utilizing the preparation method, the problems of interface pollution and damage caused by traditional wet transfer in the existing preparation of the graphene-based barrier film as well as weak interlayer coupling, short permeation path and the like in subsequent multi-layer stacking can be solved.