56results about How to "Large absorption cross section" patented technology

The invention provides a protective composite material, which comprises a protective layer, a functional layer and a comfort layer stacked in order; from the end of the protective layer, the functional layer includes a nuclear radiation shielding layer, an electromagnetic shielding functional layer and a textile substrate which are sequentially stacked, or, the functional layer includes the nuclear radiation shielding layer and the textile substrate which are sequentially stacked; and from a fabric substrate end, the comfort layer includes a neutron protective coating and a polypropylene high-molecular substrate which are sequentially stacked. The invention also provides a preparation method of the protective composite material. The protective composite material has multiple functions of flame retardation, static prevention, anti-ionization/electromagnetic radiation and neutron protection, and can be used for processing nuclear radiation protective clothing and protective tents, flexible protective screens and the like.

The invention discloses a neutron shield material with flame-retardant neutron shield heat-shielding performance and a preparation method thereof. The material is prepared from dimethylvinyl silica gel, a neutron absorber material, a flame-retardant functional filler, a heat-shielding functional filler, vulcanizing agent 2,5-dimethyl-2,5-dihexane and a powder surface modifier. The method comprises the steps of adding the dimethylvinyl silica gel and vulcanizing agent 2,5-dimethyl-2,5-dihexane in an open mill for plastication, then mixing the mixture and the neutron absorber material, the flame-retardant functional filler, the heat-shielding functional filler as well as the powder surface modifier, adding the mixed solution in a vacuum internal mixer for banburying, and finally adding a product obtained after the banburying into a press vulcanizer to obtain the neutron shield material with the flame-retardant neutron shield heat-shielding performance. The material has the thermal neutron shielding performance, and has good tenacity, flame-retardance, heat-shielding performance and mechanical strength, peripheral protection of nuclear instruments with complicated shaped can be met, and the material is also a good core material for neutron protection clothing.

The invention relates to rare-earth nuclear-radiation-proof mortar. The rare-earth nuclear-radiation-proof mortar is prepared from the following components in percentage by weight: 24 percent to 28 percent of cement, 40 percent to 60 percent of aggregate, 10 percent to 30 percent of rare earth and 0.8 percent to 2.0 percent of an additive, wherein the rare-earth aggregate contains oxides, oxalates, carbonates or complexes of rare-earth elements including lanthanum, gadolinium, samarium, europium, or dysprosium and the like. Compared with the prior art, the rare-earth nuclear-radiation-proof mortar provided by the invention has good mechanical property, waterproof property and construction property, and has a good shielding effect on gamma and neutron rays.

The invention discloses an optical-fiber laser device which includes pump devices, fiber bragg gratings, a gain optical fiber and a pump feedback device. Pump light sent by the pump devices is injected into the gain optical fiber through pump couplers. The fiber bragg gratings are used as endoscopes of the laser device and fusion welded at the two ends of the gain optical fiber. The gain optical fiber is shorter in length than an optical fiber needed for completely absorption of the injected pump light so as to ensure 10%-50% of residual pump light. The pump feedback device feeds back the residual pump light at the tail end of the gain optical fiber into a pump injection end and then the pump light is injected into the gain optical fiber again. The optical-fiber laser device uses a shorter gain optical fiber to reserve specific residual pump light so that re-absorption of signal light by the gain optical fiber in the laser device is inhibited effectively and generation of a nonlinear effect is inhibited effectively and under the same output power, the laser device has a larger nonlinear effect threshold than a conventional laser device so that the laser device is applicable to laser devices of a plurality of kinds of wavelengths and amplifiers.

The invention discloses a two-photon deep red emission fluorescent probe for imaging cell membranes in tissues based on molecular rotors. The chemical name of the two-photon deep red emission fluorescent probe is N,N-di((4-(2(minute)-(4(second)-dodecyl)pyridine-4(second)iodide)ethylene)phenyl)phenylamine, and a chemical structural general formula is as shown in a formula (I). The invention also discloses application of the two-photon deep red emission fluorescent probe in marking or displaying cell membrane forms in the tissues and in living cells. A test verifies that the two-photon deep red emission fluorescent probe can be used for uniformly and continuously dyeing the cell membranes, bright two-photon deep red light can be emitted after the two-photon deep red emission fluorescent probe is bound to high-viscosity cell membranes because the two-photon deep red emission fluorescent probe is a rotor type molecule, the two-photon deep red emission fluorescent probe is indicated to have a very good prospect by being used as a cell membrane fluorescent probe, and the blank of a cell membrane probe in tissue imaging is hopefully to be filled; meanwhile, the two-photon deep red emission fluorescent probe has the characteristics that the application range is wide, the light stability is good, the cytotoxicity is low, and the cell membranes can be specifically imaged in the living cells.

The invention provides a preparation method of a metal quantum dot plasma coupler color filter. The preparation method comprises the steps that 1) metal nanoparticles (1) are prepared by utilizing a polyol method; 2) metal/SiO2 core/shell composite particles (3) coated by silicon dioxide shell layers (2) of different thicknesses are prepared; 3) amination of the surface of the metal/SiO2 core/shell composite particles is performed by utilizing 3-aminopropyltriethoxysilane; 4) oil phase red light quantum dots and green light quantum dots (4) are prepared by utilizing a high temperature thermal decomposition method and surface ligands are replaced by 3-mercaptopropionic acid; 5) the metal/SiO2 core/shell composite particles are connected with the quantum dots by utilizing a self-assembling method so that a metal quantum dot plasma coupler (5) is formed; 6) ethyl orthosilicate is catalyzed to be hydrolyzed by utilizing ammonia to prepare SiO2 sol; 7) the metal quantum dot plasma coupler is mixed with the SiO2 sol so that metal quantum dot plasma coupler dispersion liquid is formed; and 8) metal quantum dot plasma coupler dispersion liquid is enabled to form a pixel image by utilizing a spraying method.

A selectively addressable optical biomolecular carrier and its method of use for reconfiguring gene circuits are described. One carrier is a plasmon resonant nanoantenna formed from a gold metal nanorod coated with a cationic phospholipid bilayer with an aspect ratio between 2.0 and 8.0 and plasmon resonance wavelength in the near infrared range. Biomolecules such as siRNA adhere to the carrier and are introduced into a cell. The biomolecules are released from the nanoantenna carriers with exposure to light at the plasmon resonance wavelength. The nanoantenna efficiently converts absorbed optical energy to surface localized heat releasing the biomolecules at a time determined by the user. The carrier can be used to modify gene circuits by allowing temporal control over the genes within a selected gene circuit through the optical release of interfering nucleotides. Optical silencing of endogenous genes with siRNA released from nanoantenna carriers was used to illustrate the methods.

The present invention provides fluorene derivatives having a multi-photon absorption characteristic, a preparation method and applications thereof. According to the preparation method, fluorene is adopted as a raw material, potassium hydroxide is adopted as a catalyst, oxidation is performed to prepare 9-fluorenone, a bromination reaction is adopted to link bromine to the fluorene ring, the obtained compound and phenylacetylene containing an ether group (-O-R) generate a fluorenone derivative under an effect of the catalyst, and the fluorenone derivative reacts with a Lawesson reagent to generate a series of fluorene derivative materials having a multi-photon absorption characteristic, wherein the method has characteristics of mild conditions, high reaction selectivity and low cost. The materials can be used in ultrafast laser amplitude stabilizers.

The invention discloses a neutron back scattering imaging device for plastic mine detection. The device comprises a position sensitive detector, a low energy neutron absorbing layer, a reflector, a shield, a stainless steel structure, a source strength monitoring detector, a neutron generator sealing component and a flexible high voltage cable. The position sensitive detector is located at the bottom end of the device, and the low energy neutron absorbing layer abuts against an upper surface and a side surface of the position sensitive detector; the neutron generator sealing component is located at the center of the device and is powered by the flexible high voltage cable; the reflector and the shield are sequentially wrapped at the outside of the neutron generator sealing component and are carried in the stainless steel structure; and the source strength monitoring detector is embedded from the top into the interior of the reflector. The device has two detection modes, that is, counting and imaging, fast early warning can be achieved in the counting mode, accurate identification of shape, size, embedding distribution, explosive content and other information of the mine can be achieved in the imaging mode, so that the false alarm rate of mine detection can be greatly reduced.

The invention relates to producing an optical memory which combines stability of written and non-written data with high writing speed and good sensitivity during writing, such an optical memory as well as a method of writing in such a memory. The optical memory has a liquid crystal (LC) layer with a first type of LC molecules (102) aligned in one direction, forming a polymer network, and a second type of LC molecules (104) oriented in a perpendicular direction, in which the orientation of said second type of LC molecules is meta-stable. By making use of a force, exerted on the second type of LC molecules (104), by the network of aligned crosslinked molecules, an increase in relaxation rate for the second type of molecules (104) from a meta-stable state of orientation, is achieved, which makes it possible to use said relaxation for writing data at an increased writing rate.

A dibenzothiazine two-photon acidic photoinitiator includes: having the dibenzothiazine as initial material, subsequently preparing the intermediate (I) N-alkyldibenzothiazine, (II) 3,7-bisformacyl-N-alkyldibenzothiazine and (III) 3,7-bis p-dialkylaminostyryl-N-alkyldibenzothiazine, finally synthesizing the target product by intermediate (III). The composition has a high stability and is a perfect two-photon acidic photoinitiator no matter being solution or film.

The invention relates to the technical field of up-conversion luminescent materials, in particular to a method for preparing up-conversion luminescent materials. First, a TiO2:Er-Yb nanocrystalline up-conversion luminescent material embedded in an amorphous matrix is ​​prepared by a sol-gel method. , and then immerse the up-conversion luminescent material in a Mo(NO3)3 solution for chemical modification, and anneal at a temperature of 500-1000° C. to prepare a TiO2-based nanocrystal up-conversion luminescent material with a core-shell structure. On the one hand, the present invention uses the amorphous embedded in TiO2:Er-Yb nanocrystals to reduce the light scattering of TiO2:Er-Yb nanocrystals, and on the other hand, utilizes the shell formed by surface modification to reduce surface states to improve upconversion luminescence It not only has the advantages of simple operation, can greatly improve the luminous performance, obtain high luminous intensity and high brightness, but also has the advantages of high luminous efficiency, especially reduces the production cost and reduces the toxicity of organic solvents.

The invention provides a Bi-Nd-Yb co-doped YAG high-efficiency and wide-spectrum quantum cutting luminescent material. A composition general formula of the luminescent material is Y3Al5O12:xBi<3+>, yNd<3+>, zYb<3+>, wherein x is greater than or equal to 0.5*10<-2> and less than or equal to 1*10<-2>, y is greater than or equal to 0.5*10<-2> and less than or equal to 2*10<-2> and z is greater than or equal to 1*10<-2> and less than or equal to 10*10<-2>. According to the Bi-Nd-Yb co-doped YAG high-efficiency and wide-spectrum quantum cutting luminescent material provided by the invention, Nd<3+>-Yb<3+> co-doping belongs to two-step energy transmission and has relatively high energy conversion efficiency; Bi<3+> in the luminescent material can be used for effectively expanding an absorption section of Nd<3+> through a sensitization effect; sunlight is subjected to broadband absorption so that high-efficiency and wide-spectrum conversion type near-infrared quantum cutting is realized; finally, the sunlight is sufficiently utilized and the conversion efficiency of a crystalline silicon solar cell is improved.

Provided is a triphenylamine derivant two-photon light storage material which considers the triphenylamine as initial material, including firstly producing the intermediate tris(4-iodophenyl)amine, then synthesizing the target product. The material is a good two-photon light storage material which has a low two-photon blanch threshold, writes laser power of 8mw, attains blanch with a small exciting power, has a large two-photon absorption cross section.

The invention belongs to the technical field of antitumor drugs and discloses a nano photosensitive material containing conjugated polymer and having a two-photon imaging function and photodynamic curative efficacy as well as preparation and an application. The nano photosensitive material is water-soluble nanoparticles containing the conjugated polymer, a photosensitizer and a red light emittingcompound, the conjugated polymer is an energy donor material, and the photosensitizer and the red light emitting compound are energy receptor materials; shells of the nanoparticles are formed by a surfactant, and surfaces of the nanoparticles are modified with a modifier containing a functional group having a targeted recognition effect on tumor cells. The nano photosensitive material has good biocompatibility, can enter cells easily, has the efficient two-photon imaging function and two-photon photodynamic curative efficacy, can selectively bond with cancer cells and treat tumor with the photodynamic therapy adopting synchronous two-photon imaging and has high therapy efficiency and few side effects. The preparation method is simple, mild in synthesis condition and easy to implement.

The invention relates to the technical field of the dual-photon fluorescence probe, and specifically relates to an application of the dual-photon fluorescence probe. The dual-photon fluorescence probeis applied to the cell and tissue imaging and used for detecting lipid raft content and distribution dynamic; the probe can improve the accuracy, precision, sensitivity and imaging resolution of thelipid raft detection, thereby providing a new thought for further preventing and controlling Alzheimer's disease and Prion Disease and like neurodegenerative diseases.

The invention relates to a novel copper-based composite material and a preparation method thereof, and belongs to the field of metal and composite materials thereof. The novel copper-based composite material comprises the following components in percentage by mass: 10-20% of B4C, 5-10% of hBN and the balance of copper. The preparation method comprises the steps that firstly, three kinds of powder including Cu powder, B4C powder and hBN powder are weighed and subjected to ball milling for 2-5 h according to a preset proportion, then a heat-resistant steel mold is filled with the mixed powder, then the mold is placed in a vacuum hot-pressing sintering furnace for hot-pressing sintering forming, after sintering is completed, the temperature is lowered to the room temperature along with the furnace, and the novel copper-based composite material is obtained. The technological process is simple and controllable, and the prepared novel copper-based composite material is excellent in comprehensive performance, can be used for harsh working conditions of dry friction, abrasion, corrosion and nuclear radiation interaction, and has very wide application prospects and popularization value.