21 results about "Van der Waals force" patented technology

The invention relates to the technical field of manipulators with finger-shaped piece chucks, in particular to a magneto-rheological bionic bristle contact pad, a grabbing manipulator and a grabbing control method. According to the magnetorheological bionic bristle contact pad, Van der Waals force passively generated based on a bristle structure is organically combined with the characteristic that the state of the magnetorheological fluid can be rapidly changed, and rigidity control over bionic bristles is achieved by means of the characteristic of the magnetorheological fluid; when being applied to a manipulator, the self-adaptive grabbing device can be self-adaptive to the surface of a grabbed object and generate dry adhesion, the grabbing force can be accurately controlled and kept in the grabbing process, the self-adaptive grabbing device can be self-adaptive to the surface of the grabbed object, the surface of the grabbed object is not damaged, meanwhile, the grabbing force can be controlled in the grabbing process, and the grabbing efficiency is improved. And the grabbing quality and efficiency are improved.

The application discloses a method for constructing sub-nanometer plasmonic nanocavity, comprising the following steps: (1) preparing a flexible metal nanometer array film; (2) constructing a spacing layer on the exposed metal side of a flexible metal nanometer array film, and then placing another flexible metal nanometer array film on the exposed metal side of the spacing layer, so that the two flexible metal nanometer array films are adsorbed and attached by Van der Waals force, thereby obtaining a plasmonic nanocavity, which allows polarized excitation, realizes the enhancement of molecular signal and carries out the research on adsorption form. Compared with the chemical synthesis method, the application is more accurate and easy to realize in the control of structure gap, and the substrate is more uniform; compared with the nanometer gap prepared by photolithography and ion beam, the substrate process of the application is simple, easy to operate and short in time consumption, and the structure has a controllable sub-nanometer gap. The method has simple preparation process, high repeatability and stability.

The application discloses a three-dimensional ferroelectric material based on two-dimensional ice stacking and preparation and application thereof, and belongs to the technical field of ferroelectric materials and multifunctional devices. The material is a three-dimensional periodic crystal structure of monoclinic P21 space group, water molecules in the material form a completely saturated network through hydrogen bonds, and there is no suspended hydrogen; interlayers are coupled through van der Waals force to form a multi-level cooperative ferroelectric sequence of "in-plane hydrogen bond ferroelectric + interlayer van der Waals ferroelectric". The material has the characteristics of a wide-bandgap semiconductor (band gap 5-6 eV), extreme anisotropic mechanical properties (Z-axis Young's modulus 48.6 GPa, Eyx=0.973), moderate bulk modulus (12.23 GPa), good acoustic performance (sound velocity 2638 m / s) and extremely high pressure stability (0-3000 GPa structure is complete, 1190 GPa metalization transition). The material can be widely applied in the fields of X-ray optical devices, ferroelectric memories, deep ultraviolet photoelectric detectors, extreme high-pressure sensors, directional stress sensors, mechanical logic devices, surface acoustic wave filters, multifunctional integrated microsystems and multi-parameter composite sensing networks, and opens up a new direction for pure water-based functional materials.

The invention discloses a cucurbit [5] uril-based framework material as well as a preparation method and application thereof, and belongs to the crossing field of supramolecular chemistry and functional materials. The preparation method comprises the following steps: dissolving potassium salt and cucurbit [5] uril in distilled water; then adding a 3, 3 '-disulfo-[1, 1'-biphenyl]-4, 4 '-dicarboxylic acid ligand, and stirring to obtain a mixed solution; the mixed solution is subjected to a heating reaction, then cooling, filtering and drying are conducted, and the cucurbit [5] uril-based framework material is obtained, and the chemical formula is C396H360K18N180O198S18. Through coordination of an organic ligand containing a sulfonic acid group and metal ions, in combination with non-covalent interaction of hydrogen bonds, Van der Waals force and the like, and through optimal regulation and control of a material ratio, pH and temperature, a honeycomb three-dimensional porous framework structure with high stability is successfully constructed. By utilizing the fluorescence characteristic and the structural characteristic, the efficient recognition of Fe < 3 + > and Pb < 2 + > heavy metal ions and norfloxacin antibiotics in a water body can be realized. The problems that in the prior art, when heavy metal ions and antibiotics in water are detected, operation is tedious, and cost is high are solved.

The embodiment of the invention provides a composite fiber material and a preparation method and application thereof. The composite fiber material comprises: a substrate comprising cotton fibers; the active component is located on at least part of the surface of the substrate, the active component comprises a first active metal and a ligand, the first active metal comprises at least one of copper and iron, and the ligand comprises at least one of tetra (4-carboxyphenyl) porphyrin and 2, 3, 6, 7, 10, 11-hexahydroxybenzophenanthrene; the metal organic framework layer is connected with the active component through Van der Waals force, and the metal organic framework layer is a porphyrin metal framework layer. The composite fiber material provided by the embodiment of the invention can be used for preparing a sensor for detection of colorimetric / fluorescent bimodal sensing, and the detection limit and accuracy can be improved.

The invention relates to the technical field of graphene nano composite materials, in particular to a graphene / metal nano composite material and a preparation method and application thereof, a plurality of nano metal particles are compounded on the surface of graphene powder, each nano metal particle is provided with at least one unsaturated d orbital domain, and the surface of each nano metal particle is provided with at least one unsaturated d orbital domain. The electrons of the unsaturated d orbital domain are coupled with the pi electrons on the surface of the graphene, and the graphene is intrinsic graphene. According to the graphene / metal nano composite material, bonding strength far higher than Van der Waals force can be formed by coupling electrons of unsaturated d orbital domains of metal particles and pi electrons on the surface of intrinsic graphene, the high quality of graphene can be maintained, the graphene can be tightly combined with the metal particles, and the graphene / metal nano composite material can be used for preparing the graphene / metal nano composite material. The electric conduction and heat conduction performance of the composite material is remarkably improved, and the calculation result of artificial intelligence multi-scale simulation is met.

The invention relates to a Ti3C2Tx / Fe2O3 / CNTs humidity-sensitive material and a preparation method thereof, Ti3C2Tx is used as a template, through hydrothermal reaction with FeCl3, Fe2P3 is generated and is self-assembled to the surface of Ti3C2Tx, a Ti3C2Tx / Fe2P3 material is finally formed, the Ti3C2Tx / Fe2P3 material and a uniform aqueous dispersion of carbon nanotubes ( / CNTs) are fully mixed, the materials are assembled together through Van der Waals force, and the Ti3C2Tx / Fe2O3 / CNTs composite material is obtained. Ti3C2Tx has abundant surface properties and excellent structural stability, an ideal platform is provided for generation of Fe2O3 nanoparticles, and CNTs are connected with all Ti3C2Tx / Fe2P3 lamellar structures to form a continuous and stable conductive network. A network structure formed by connecting the CNTs is like an electron transmission'highway ', so that the overall resistance change of the material caused by water molecule adsorption / desorption can be extremely sensitively transmitted out, and the signal response of the sensor is amplified. According to the preparation method, the humidity sensitive material with high sensitivity and excellent responsiveness can be obtained, the preparation process is simple, and the humidity sensitive material can be practically applied to the fields of industry, environmental monitoring, medical treatment and the like.

The application discloses a graphene preparation method based on interlayer stress resonance. Macroscopic mechanical rotation energy is converted into high-frequency and directional stress energy which can precisely act on the van der Waals force between graphite layers through a series of carefully designed physical processes. Under specific rotation conditions, unstable vortex structures (such as Taylor vortex flow) are generated in the confined fluid. When the stress wave formed by the vortex in the viscoelastic fluid is coupled with the intrinsic vibration frequency between the graphite layers, resonance phenomenon is triggered. The resonance can amplify the strain energy between the graphite layers, so that the interlayer van der Waals force is efficiently and selectively overcome under the condition of energy input far lower than the in-plane fracture threshold of carbon-carbon bond, and the graphene is exfoliated to obtain large and few-layer graphene.

The invention discloses a calixarene derivative and a preparation method and application thereof, the structure of the calixarene derivative is as shown in formula I: R1 is CO2-NH4 < + >; r2 is any one of straight-chain alkyl, branched-chain alkyl, straight-chain alkyl containing double bonds and branched-chain alkyl containing double bonds. According to the invention, iodobalix [4] arene and an alkynyl-containing phenyl compound are connected through a Sonogashira coupling reaction to construct an extended aromatic macrocyclic skeleton, and then an ionic water-soluble structure is obtained through upper edge ester group hydrolysis. The calixarene derivative has the following innovative advantages that the depth and the volume of a cavity are remarkably increased, and large-volume guest molecules can be efficiently included; the extended cavity realizes effective inclusion of guest molecules through hydrophobic interaction and Van der Waals force; an upper edge carboxylate radical ion group specifically recognizes a cationic object through electrostatic interaction, so that the multi-site recognition function of enzyme is simulated; the water solubility is enhanced, and the method is suitable for the biological medicine fields of drug delivery, ion sensing and the like.

The application discloses a preparation method of a double-targeting graphene-based biological nanopharmaceutical transport system and application thereof. Graphite is dispersed in a mixed solution of sulfuric acid and phosphoric acid, and KMnO4 is added for reaction, and after the reaction, graphene oxide powder GO is obtained through treatment; the GO is dispersed in a solvent, and magnetic targeting molecules are generated on the surface of the graphene oxide through a chemical co-precipitation method, so that GO / magnetic nanoparticles are obtained; the GO / magnetic nanoparticles are dispersed in a polar solvent, and through covalent bond, electrostatic interaction, hydrogen bond and / or van der Waals force, a receptor-mediated active targeting molecule is fixed on the surface of the GO / magnetic nanoparticles, so that double-targeting modified graphene oxide composite material is obtained; the composite material is dispersed in a coupling agent and an activator, and a dicarboxylic acid compound containing a disulfide bond is added for reaction, and after the reaction, the double-targeting graphene-based biological nanopharmaceutical transport system is obtained through treatment and drying. The application constructs a graphene-based biological nanopharmaceutical transport system with high stability, strong targeting and controllable release capacity, and realizes efficient loading of drugs, tumor microenvironment response release and multi-target point synergistic precise delivery.

The application discloses a two-dimensional sheet material based on electrostatic interaction and a method for regulating the interlayer spacing size thereof and application, and belongs to the technical field of film material preparation. In the application, a functional polymer or small molecule containing an easy-hydrolyzable functional group is introduced between the two-dimensional material sheet layers. The functional polymer / small molecule as a whole is negatively or positively charged by regulating the hydrolysis and ionization of the functional group of the functional polymer / small molecule, so that the charging density of the intercalated polymer or small molecule is improved, and significant electrostatic repulsion is introduced between the adjacent sheet layers to overcome the interlayer van der Waals force and drive the continuous expansion of the interlayer structure. Furthermore, ions with opposite electric properties to the charged groups are introduced to realize the coordination of the charged groups and the ions to achieve charge compensation, inhibit or adjust the expansion, so that the interlayer space size can be regulated in a wide range, accurately and reversibly.

The application discloses a multi-surface adhesion device with angle tolerance and an adhesion test system thereof, and relates to the field of bionic adhesion technology. The adhesion device comprises an upper substrate layer, a lower substrate layer, a buffer layer between the two, a bionic nano-array layer arranged on the surface of the upper substrate layer, and a connecting structure penetrating through the buffer layer. The bionic nano-array layer is composed of mushroom-shaped microstructures and realizes non-destructive and reversible adhesion by using van der Waals force; the buffer layer can be deformed with the angle deviation of the target surface to provide an angle tolerance of 0-15 degrees. The test system comprises a fixing frame, a simple pendulum suspension mechanism, an angle adjusting structure and a collision impulse control structure, and is used for simulating working conditions under different angles and impact conditions and performing standardized and quantitative tests on adhesion performance. The application realizes repeatable and non-destructive adhesion of surfaces of various materials, and can maintain stable performance within the range of-120 DEG C to 150 DEG C, including surface fixation, temporary installation and reinforcement tasks suitable for complex environments.

The application relates to a cysteine functionalized MoS2 nanopore and application thereof in single-molecule protein and post-translational modification detection. The device realizes the regulation of the interaction between molecules in the pore, the gating state and the transport rate by constructing a peptide chain valve structure fixed by cysteine in the MoS2 nanopore and introducing positively charged and aromatic amino acids. By adjusting the composition of the peptide chain and the voltage condition, the van der Waals force, the electrostatic force and the hydrogen bond force between the protein molecule and the pore can be enhanced, the single-molecule protein can be slowly transported through the pore and the high-resolution ion current detection can be realized. The application can be used for distinguishing different amino acids, protein sequence characteristics and post-translational modification sites such as phosphorylation, and has high sensitivity, high selectivity and good scalable application prospect in protein sequencing, post-translational modification positioning and biomolecular genomics analysis.

The invention discloses a preparation method of a two-dimensional material sample suitable for a transmission electron microscope, and belongs to the technical field of two-dimensional material characterization. The method comprises the following steps: placing a two-dimensional material sample to be transferred on an objective table of an optical microscope; sucking the edge of the back surface of the TEM grid subjected to plasma treatment by using a vacuum suction pen, and enabling the front surface to face downwards and be suspended; the three-dimensional mobile platform controls the carrier network to move to the position above the target area; judging the contact between the grid and the sample by means of the imaging focusing state of the optical microscope; and transferring the target area to a carrying net by utilizing the adsorption effect of Van der Waals force. According to the method, precise and controllable transfer of a micron-scale two-dimensional material area is achieved, the method is particularly suitable for an in-situ chip or a copper net which is prone to damage and has a window not larger than 50 microns, operation is visual, the success rate is high, and a reliable sample basis is provided for follow-up TEM-based atomic scale performance research.

The invention relates to a method for developing and transferring a two-dimensional material, comprising the following steps: growing the two-dimensional material on a surface of a growth substrate so that the two-dimensional material is bonded to the surface of the growth substrate by van der Waals forces, the surface of the growth substrate having a first contact angle with a drop of a liquid; providing a target substrate, the target substrate having a surface having a second contact angle with a drop of the liquid, the second contact angle being strictly greater than the first contact angle; joining the growth substrate and the target substrate by direct bonding between the two-dimensional material and the surface of the target substrate;rupture of the interface between the growth substrate and the two-dimensional material by propagation of an interfacial crack at the interface between the two-dimensional material and the growth substrate, the crack front being wetted by the liquid. Figure to be published with the abbreviation: Figure 1C;

The invention discloses a solid particle partition storage and reuse device and a control method, which can screen out particles, biological cells and the like with excellent parameters and diameters from dozens of nanometers to dozens of microns through a particle calibration observation device, and store the particles, the biological cells and the like into a hollow-core optical fiber; piezoelectric ceramics or an ultrasonic device is utilized to enable the particles to vibrate and overcome Van der Waals force between the particles and the inner wall of the hollow-core optical fiber, so that the particles jump to the central area of the fiber core of the hollow-core optical fiber and are captured by laser beams propagating in the hollow core again. And meanwhile, the device can store a plurality of particles with different attributes, so that repeated contrast experiments can be conveniently carried out.

This invention relates to a method for enhancing the valley polarization of monolayer tungsten disulfide using a ferromagnetic lanthanum manganese oxide substrate. A lanthanum manganese oxide (LMO) thin film is prepared using laser pulse deposition. The LMO thin film has the structural formula LaMnO3 and a thickness of 30 nm to 40 nm. A thin layer of tungsten disulfide (WS2) is prepared. The WS2 thin layer is 1-10 WS2 molecule-thickness WS2 material. The thin layer of WS2 is transferred to the LMO thin film using a dry transfer method. WS2 molecules are transferred to the LMO thin film through van der Waals forces, forming a material structure with a monolayer of WS2 molecules on the LMO substrate, thereby enhancing the valley polarization of the monolayer tungsten disulfide using the lanthanum manganese oxide substrate. The material structure with a monolayer of WS2 molecules on the LMO substrate is a monolayer WS2 / LMO van der Waals heterojunction.

The invention provides a kaolinite AL-O surface targeted chelating collector and preparation and application thereof, and relates to the technical field of chelating collectors, the kaolinite AL-O surface targeted chelating collector comprises the following components by weight: 30-50 parts of alkyl hydroxamic acid, 40-60 parts of kerosene, 10-30 parts of D-limonene, 2-8 parts of a biquaternary ammonium salt gemini surfactant, and 0.5-5 parts of 18-crown-6. A hydration film on the surface of kaolinite is destroyed by utilizing the strong charge density of the ionic liquid, precise targeted recognition of an Al-O surface is realized by matching with the electrostatic anchoring effect of the biquaternary ammonium salt gemini surfactant, and D-limonene is induced to generate molecular configuration fine adjustment under the assistance of ultraviolet light, so that Van der Waals' force and space interlocking among components are increased, and the sensitivity of the kaolinite is improved. The micellar structure is reinforced on the molecular level, the shear stability and permeation efficiency of the collecting agent in the complex hydraulic environment are improved, and efficient hydrophobization separation of the micro-fine particle kaolinite is achieved.

The application discloses magnetic nano titanium dioxide and a preparation method and application thereof in enrichment of low-abundance proteins. The application successfully prepares magnetic nano titanium dioxide (Fe3O4@SiO2@TiO2) by adopting a sol-gel method, which first pre-coats a layer of SiO2 on the surface of the iron core, and then coats TiO2; the pre-coating of SiO2 is more favorable to the formation of the TiO2 coating layer, and the surface properties of TiO2 are ensured from being destroyed, the protein adsorption performance of TiO2 does not decrease, and meanwhile, the magnetic property is endowed; and the application provides a more simple, rapid and efficient technical method for large-scale sample processing. The application realizes the enrichment of low-abundance proteins in various sample types by utilizing the coordination, electrostatic interaction, hydrogen bond interaction and Van der Waals force between the magnetic nano titanium dioxide and the proteins, effectively solves the interference caused by high-abundance proteins on the identification of low-abundance proteins during mass spectrometry detection, and the number of protein identifications can be increased by 100% to 700%.

Disclosed are a monomer for a polymer gel, a polymer gel and a preparation method therefor. The preparation method includes: reacting 4,4′,4″-trihydroxytriphenylmethane with tert-butyldimethylchlorosilane to obtain TPC-OTBS; reacting 4,4′,4″-trihydroxy triphenylmethane with sulfuryl fluoride in the presence of triethylamine to prepare TPC-OSO2F; and dissolving the TPC-OTBS and TPC-OSO2F in DMF, then adding DBU and ultrasonically dispersing same until uniform, and letting same stand to obtain a polymer gel. The gel obtained by the present invention can selectively adsorb an organic solvent by means of electrostatic interaction and Van der Waals force. The surface and internal morphologies of a solid material are characterized by SEM and TEM, in which the porous morphology of the solid material is found, and most of the pores are macropores.

The invention discloses a hole transport material, a manufacturing method of a light-emitting device and the light-emitting device. At least one of an electron donating structure and a peripheral cross-linkable structure of the hole transport material comprises at least one hydrogen bond accepting group; in this way, hydrogen bond acting force stronger than Van der Waals force can be introduced into the cross-linked hole transport material to regulate molecular arrangement, for example, when an electron donating structure comprises at least one hydrogen bond accepting group, intramolecular hydrogen bonds are formed, and the intramolecular hydrogen bonds can enhance molecular planarity and improve hole mobility; for example, the peripheral cross-linkable structure comprises at least one hydrogen bond accepting group to form an intermolecular hydrogen bond, and the intermolecular hydrogen bond can hinder the movement of chain segments in the cross-linked hole transport material, enhance the molecular rigidity and reduce the disorder of a cross-linked network, so that the material is prevented from generating an additional defect mode, and the hole mobility is improved.