528results about "From normal temperature solutions" patented technology

The invention discloses preparation and application of a millimeter-scale high-uniformity bastnaesite single crystal electron probe standard sample, and the preparation method comprises the following steps: taking CeF3 and carbonate as raw materials, carrying out solid phase mixing, carrying out a hydrothermal reaction at 400-500 DEG C under water self-generated saturated vapor pressure, and carrying out programmed cooling, washing and drying to obtain a CeCO3F single crystal which has a millimeter-scale size and does not contain Nd and other rare earth impurities. The spectrum peak overlapping interference in EPMA analysis is eliminated from the source, the internal elements are highly uniformly distributed, and the relative standard deviation (RSD) of the distribution of the key element Ce is less than 1.0%. The method is simple in process, low in cost and mild in condition, the limitation that millimeter-level single crystals are difficult to prepare through a traditional method is broken through, and the obtained single crystal standard sample has the advantages of being high in crystallinity, good in stability, high in matching degree with a natural geological sample matrix and the like, is suitable for electron probe analysis, especially high-precision quantitative analysis of rare earth element Ce and has good application prospects. And the accuracy and reliability of an analysis result can be effectively improved.

A method of producing crystalline cellulose from a cellulosic material includes the step of reacting the cellulosic material in an aqueous slurry comprising a transition metal catalyst and a hypohalite solution.

The invention provides an antimony-based chalcogenide film with (hk1) dominant orientation and a preparation method and application thereof, and belongs to the technical field of semiconductor photovoltaic materials. According to the method, the crystal orientation of the antimony-based chalcogenide film is regulated and controlled by doping PbI2 in situ under the simple solution method (water bath or hydrothermal) deposition condition, and research results show that the solution method is adopted to introduce PbI2, so that the antimony-based chalcogenide film can be remarkably induced to preferentially grow along the (hk1) direction, grain boundary scattering and inter-chain potential barriers are effectively weakened, and the crystal orientation of the antimony-based chalcogenide film is improved. The carrier longitudinal migration and collection efficiency is improved, so that the VOC loss is reduced, and the final battery performance is improved; the method provided by the invention not only provides a new thought for preparing the high-orientation antimony-based chalcogenide film, but also lays a technical foundation for design and optimization of a bottom battery material in a future laminated battery.

The present invention relates to single-crystal spherical carbon nanoparticles that are single-crystals, are spherical, and have an average particle diameter of 1 nm to 30 nm. The single-crystal spherical carbon nanoparticles of the present invention can generate fluorescence with a high fluorescence quantum efficiency when excited by a light in wide wavelength range from ultraviolet light to visible light, and have fluorescence quantum efficiency of 10% or more compared to conventionally known carbon nanoparticles. The single-crystal spherical carbon nanoparticles can be used for drug delivery, because they do not have toxicities to living organisms that compound semiconductors made of cadmium, selenium, tellurium, and the like have. Furthermore, since the single-crystal spherical carbon nanoparticles are spherical, they can be densely packed as electrode materials for solar cells and secondary ion batteries, and can be used for negative electrode for lithium ion batteries or electrode material for solar cells.

To provide a process for forming drug crystals of narrow size distribution and desire dimensions and morphology.SOLUTION: The present invention relates to a process for providing corticosteroid crystals of desired size distribution and morphology, the process comprising the steps of: providing recrystallized ultra-large columnar crystals having aspect ratios of more than 1 and less than 20, the aspect ratio of a given columnar crystal being the ratio of a longest dimension along a lengthwise axis relative to a shortest dimension of a transverse plane perpendicular to the lengthwise axis; and sizing the recrystallized ultra-large columnar crystals to provide a collection of sized crystals having target dimensions, wherein the sizing includes segmenting at least a part of the recrystallized ultra-large columnar crystals along the respective lengthwise axes while retaining the dimensions of the transverse plane perpendicular to the lengthwise axis.SELECTED DRAWING: None

The invention provides a fleroxacin salicylic acid drug salt single crystal prepared from acetylsalicylic acid and a preparation method thereof. The preparation method comprises the following steps: dissolving acetylsalicylic acid and fleroxacin in 8-15 mL of a solution formed by mixing one, two or more than two solvents of water, ethanol and methanol according to a certain molar ratio; and putting the mixed solution in a constant-temperature water bath at 40-80 DEG C, and stirring for 1-5 hours. And after full reaction, volatilizing the mixed solution in a suitable environment to obtain colorless blocky crystals after 1-30 days, namely the fleroxacin salicylic acid drug salt single crystals. The crystal can effectively improve the solubility, moisture absorption stability and permeability of fleroxacin. Compared with fleroxacin, the fleroxacin salicylic acid drug salt single crystal has the advantages that the bacteriostatic effect and the inflammatory factor level reducing effect are improved, and the fleroxacin salicylic acid drug salt single crystal has good antibacterial and anti-inflammatory effects.

The invention belongs to the field of bionic electronic materials and application, and discloses a dipeptide amino acid sequence with a piezoelectric effect, a dipeptide piezoelectric fiber film is prepared from the dipeptide amino acid sequence through a drop casting method, a meniscus driving method and an electric field induction meniscus driving method, and the obtained fiber film is assembled into an application example of a piezoelectric generator. The amino acid sequence of the dipeptide with the piezoelectric effect is Fc-L-Phe-L-Phe-OH, in the formula, Fc is a ferrocene benzoic acid group, Phe represents phenylalanine, and L represents the chirality of used amino acid. The dipeptide micron fiber thin film which is large in area and closely arranged is prepared by utilizing a drop casting method, a semilunar driving method and various methods of introducing a regulation and control electric field in a semilunar driving method membrane preparation process. The obtained fiber film is assembled into a piezoelectric generator of a sandwich structure, the piezoelectric output performance of the piezoelectric generator is closely related to the preparation method of the fiber film, and the piezoelectric performance of the dipeptide fiber film can be remarkably improved through an electric field induction meniscus driving method.

The application discloses a preparation method of vanadium-doped and high-hydrated mangan-chromian spinel monocrystal under high temperature and high pressure. The cylindrical mangan-chromian spinel sample is prepared by taking solid rose triangular rhombic manganese carbonate crystal, solid chromium (III) acetate hydroxide crystalline powder, solid vanadium (IV) acetylacetonate oxide powder, solid oxalic acid powder, solid bixbyite powder, solid chromium hydroxide powder and liquid dilute nitric acid as starting raw materials; two pieces of water source sheets are made from the bixbyite powder and the chromium hydroxide powder with a weight ratio of 4:1; the two pieces of water source sheets are placed at two ends of the cylindrical mangan-chromian spinel sample and then are placed into a double-capsule structure experimental sample bin with an inner layer sleeve being a graphite tube and an outer layer sleeve being a gold-palladium alloy tube; the high temperature and high pressure reaction is carried out to obtain the mangan-chromian spinel monocrystal; and the preparation technology blank of the vanadium-doped and high-hydrated mangan-chromian spinel large-particle monocrystal under the current high temperature and high pressure conditions is solved.

A method of manufacturing HgTe quantum dots is described. The method comprises dissolving a mercury salt in a coordinating solvent to create a mercury solution; dissolving tellurium in a coordinating ligand compound to create a first tellurium solution; performing an initial injection of the first tellurium solution into the mercury solution to produce a synthesized HgTe QDs solution; when synthesis during the initial injection has completed, perform a subsequent continual injection of a second tellurium solution into the synthesized HgTe QDs solution; quenching the synthesized HgTe QDs solution with a solution of coordinating ligand; and separating the HgTe QDs from the rest of the quenched solution.

Low temperature synthesis, growth and doping methods and resulting materials are disclosed. According to an aspect, a method for material transformation includes providing a target material comprising carbon and / or hydrocarbon. The method also includes placing the target material within a fluid comprising a hydrogen source. Further, the method includes applying energy to the target material such that at least some of the target material is transformed to the same material with new beneficial bonding configuration.

A process for producing a polymorphic or pseudo-polymorphic crystalline phase from a plurality of compounds (C,D,S1,S2), comprising the steps of preparing (I) a supersaturated solution from said compounds, homogenizing (II) said supersaturated solution in an ultrasonic bath, transferring (III) the supersaturated solution into a plurality of heated tubes (54), aging (V) the solutions transferred into the tubes for a determined period, exposing said tubes (54) to a pulsed and polarized laser beam before and / or during exposure, monitoring in situ the nucleation and then the growth of co-crystals inside said tubes (54), and filtering the exposed solutions to recover co-crystals larger than a predetermined minimum size.This process is implemented to carry out co-crystallization from at least one active substance (D) and one co-former (C) in at least one first solvent (S1) and one second solvent (S2), and it further comprises two preliminary steps: establishing a phase diagram from the respective physicochemical characteristics of said active substance (D), said co-former (C), said first solvent (S1) and said second solvent (S2), and then determining, from said phase diagram thus established, concentration, temperature and exposure conditions providing a stable phase for the production of co-crystals. See Figure 4.

The application discloses a chain-like core-shell structure crystal and a preparation method and application thereof, the crystal is chloroethyl HDABCO-sodium bromofluoroborate, a structural formula of the crystal is [CH2ClCH2N(CH2CH2)3NH]4·[(Na6Br)(BF4) 13 ], a molecular structure presents a one-dimensional chain framework with infinite extension, adjacent chains are connected through N-H...F linear hydrogen bonds and chloroethyl-HDABCO, so that the compound has polarity and has a mid-infrared second-order nonlinear effect. In addition, the ultraviolet band edge absorption of the material is close to the near ultraviolet region, so that the material is expected to be close to inorganic ultraviolet nonlinear optical materials. The crystal is obtained through room temperature volatilization crystallization, has good thermal stability, and has potential application values in the fields of laser frequency doubling conversion, electro-optic modulators, deep ultraviolet nonlinear optics and shutter used for high-speed photography.

Nanostructures including a first semiconductor nanocrystal including zinc and selenium, and a second semiconductor nanocrystal including a zinc chalcogenide, wherein a composition of the second semiconductor nanocrystal is different from a composition of the first semiconductor nanocrystal,wherein the nanostructures further include tellurium,wherein in the nanostructures, a mole ratio of selenium to tellurium is greater than or equal to about 0.83:1 and less than or equal to about 10:1,wherein a derivative thermogravimetry curve of the nanostructures has an extreme value in a temperature range of greater than or equal to about 250° C. and less than or equal to about 420° C.

The present invention discloses a preparation method and application of a class of silver nanocluster-embedded niobium polyacid crystalline materials with immunological activity, belonging to the technical field of pharmaceutical synthesis. The chemical formula of the silver nanocluster-embedded niobium polyacid crystalline materials with immunological activity is L x [Ag 30 Cl y (SeO3) (8‑y) (SiNb 18 O 54 )6]·zH2O; wherein, L is a counter cation or cationic group, 1 < x ≤ 70, 0 < y ≤ 8, 1 < z ≤ 150; the overall cluster structure of the silver nanocluster-embedded niobium polyacid crystalline materials with immunological activity is composed of the [Ag 30 Cl y (SeO3) (8‑y) (SiNb 18 O 54 )6] anion cluster and the corresponding counter cation or cationic group; this material has good water solubility and stability under physiological conditions, has high cytotoxicity and selectivity for tumor cells, especially CT26 colon cancer cells, can induce immunogenic death of tumor cells and activate the body's immune system, has little toxic and side effects on normal cells and organs, and has better biosafety than the traditional chemotherapeutic drug doxorubicin, and can be used as an anti-tumor immunotherapy drug in the biomedical field.

The present invention relates to crystalline solids comprising organic molecules and to the use of the crystalline materials in optical films and electro-optical devices.

An n-type GaN substrate having two main surfaces, the n-type GaN substrate being doped with Ge, having an average carrier concentration of 1×1018 cm−3 or more, and satisfying at least one selected from the group consisting of (1) to (3) when carrier concentrations are measured at measurement points uniformly provided in a circular region having a radius of 15 mm from the center of at least one main surface: (1) a standard deviation / average of measured values at measurement points on straight lines passing through the center of the main surface in directions of 0 degrees, 45 degrees, 90 degrees, and 135 degrees is 0.25 or less; (2) the ratio of the number of measurement points at which a carrier concentration is 2×1018 cm−3 or more to the total number of the measurement points is 90% or more; and (3) the ratio of the number of measurement points at which a measured value is (A) 60% or less / (B) 50% or less / (C) 40% or less of the maximum of measured values at all measurement points to the total number of the measurement points is (A) 10% or less / (B) 9% or less / (C) 8% or less. The n-type GaN substrate has a high carrier concentration and a uniform in-plane carrier concentration distribution.

The invention discloses a circularly polarized light-emitting supramolecular self-assembly crystalline material as well as a preparation method and application of the circularly polarized light-emitting supramolecular self-assembly crystalline material. The supramolecular assembly crystalline material comprises a three-dimensional structure, and the three-dimensional structure is connected through a hydrogen bond formed between a hydrogen atom in a chiral secondary structure unit and an oxygen atom in a sulfonic acid group of 4, 4 '-bis (2-sulfostyryl) biphenyl disodium CBS. The crystalline material disclosed by the invention shows excellent chiral optical properties, good solvent stability and a remarkable luminous asymmetric factor; the circularly polarized light-emitting film material prepared from the material can effectively realize transmission and amplification of crystal optical performance.

The application discloses a preparation method of calcite type calcium carbonate whisker, and comprises the following steps: (1) preparing calcium hydroxide suspension, heating and warming the calcium hydroxide suspension to obtain hot calcium hydroxide suspension, and waiting for use; (2) adding crystal seeds and crystal type control agent into the hot calcium hydroxide suspension, and stirring uniformly to obtain hot mixed suspension; (3) continuously feeding carbon dioxide into the hot mixed suspension until the reaction is completed, stopping the feeding of carbon dioxide, obtaining calcium carbonate suspension, filtering, drying, and obtaining calcium carbonate powder; and (4) calcining and pulverizing the calcium carbonate powder in a furnace to obtain the calcite type calcium carbonate whisker. The calcium carbonate whisker prepared by the application is of the calcite type, and the application provides a new research thought for the preparation of the calcite type calcium carbonate whisker. The calcite type calcium carbonate whisker prepared by the application is the most stable phase of calcium carbonate, and the application field of the calcium carbonate whisker is expanded.

The application discloses a large-area lead-free perovskite single crystal film, a preparation method and application thereof, relates to the technical field of photoelectric detection, and has the technical points that the preparation method of the large-area lead-free perovskite single crystal film utilizes gas-liquid surface and interface action, a large-area (C7H 16 N)2CuBr4 perovskite structure single crystal film is obtained by adjusting a solvent and growth conditions. The growth method of the perovskite single crystal film can be extended unlimitedly in theory, and the thickness of the obtained single crystal film can be adjusted to 3-560 mu m. The photoelectric response switch ratio of an X-ray detector prepared by using the single crystal film with a thickness of 560 mu m reaches 91.8, and the dark current is as low as 0.11 pA. The growth method of the single crystal film is simple, raw materials are cheap and easy to obtain, is suitable for large-area single crystal film growth, and has potential application value in X-ray detectors.

The application provides a water-soluble gold nanocluster with a crystallographic structure and a preparation method thereof. The water-soluble Au 25 nanocluster with a single crystal structure is synthesized by using 2-mercaptonicotinic acid, 6-mercaptonicotinic acid or 6-mercaptobenzoic acid as a protective ligand, and the single crystal structure of the water-soluble Au 25 nanocluster is determined. The method in the application is simple, the reaction condition is easy to realize, and the gold nanocluster with a single crystal structure is obtained, and the accurate single crystal structure of the gold nanocluster is obtained, which is very important for analyzing the correlation between fluorescence and structure. The gold nanocluster Au 15 (2-Hmna) obtained by the application has near-infrared luminescence, the near-infrared has a deeper penetration into biological tissues, and has great application potential in the biomedical field.

This invention provides a large-area perovskite single-crystal film, its preparation method, and its applications, belonging to the field of semiconductor technology. The general structural formula of the large-area perovskite single-crystal film is: A m B n X z In the formula, A is an imidazole positive ion, m=1~3; B is a metal cation, n=1~2; and X is a halide anion, z=3~9. The preparation method of a large-area perovskite single-crystal film includes: mixing a metal halide precursor solution and a halide imidazole precursor solution; preheating a conductive substrate on a hot stage; drop-coating the mixed solution onto the conductive substrate for in-situ growth; annealing; stimulating any corner of the conductive substrate surface with a sharp object; and cooling to obtain a large-area perovskite single-crystal film, which can be used to prepare optoelectronic devices. This invention provides perovskite materials with specific compositions and combines in-situ growth with crystal nucleus control to prepare high-quality, large-area single-crystal films without obvious grain boundaries and defects. The process is simple and conducive to industrial application.

The invention relates to a method for producing a polymorphic or pseudo-polymorphic crystalline phase from a plurality of compounds (C, D, S1, S2), the method comprising steps of preparing (I) a supersaturated solution from the compounds, homogenizing (II) the supersaturated solution in an ultrasonic bath, transferring (III) the supersaturated solution into a plurality of heated tubes (54), aging (V) the solutions transferred into the tubes for a predetermined period of time, exposing the tubes (54) to a polarized pulsed laser beam before and / or during exposure, followed in situ by nucleation and then growing cocrystals inside the tubes (54), and filtering the exposed solutions in order to recover cocrystals having a size greater than a predetermined minimum size. This method is carried out in order to obtain cocrystallization from at least one active substance (D) and a coformer (C) in at least a first solvent (S1) and a second solvent (S2).

The application discloses a kind of Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material and its preparation method;The application uses organic-inorganic hybrid fluoride manganese salt material as Mn 4+ Source preparation Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material.The application uses organic-inorganic hybrid fluoride manganese salt material instead of all-inorganic fluoride manganese salt, manganese salt and permanganate as Mn 4+ Source, for preparing Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material, significantly improve the luminescent efficiency of Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material.

Aspects of the present disclosure include methods for improving crystallization of small molecules by understanding the effect of hypergravity conditions on particle size distributions (PSDs). Aspects of the present disclosure also include a small molecule product produced by the methods of the present disclosure.

This invention belongs to the field of rare earth doped fluoride preparation technology, specifically relating to a rare earth doped M3ScF6 nanocrystal and its preparation method. To address the problems of numerous operational steps, inherent risks, high costs, and poor product quality in the preparation of rare earth doped M3ScF6, this invention uses rare earth acetates (such as (CH3COO)3Sc, (CH3COO)3Er, (CH3COO)3Yb, etc.), CH3COOM (where M is a monovalent alkali metal, such as Na or K), and NH4F as the main raw materials, with ethylene glycol as the solvent. The process involves dissolving and mixing the materials, heating and stirring at low temperature under normal pressure, followed by washing, centrifugation, and drying to obtain the rare earth doped M3ScF6 nanocrystals.

The invention discloses a method for preparing a one-dimensional organic metal halide single crystal through a solvent regulation and control method and application of the one-dimensional organic metal halide single crystal. According to the method, BBI-ZnCl2 and BBI-ZnCl4 single crystals are respectively prepared by taking bibenzimidazole and ZnCl2 as raw materials and adjusting the volume ratio of a methanol / water mixed solvent, the process is simple, the condition is mild, and complex equipment is not needed. After the obtained single crystal is compounded with polymethyl methacrylate, a material with excellent room-temperature phosphorescence performance is formed, and continuous afterglow emission can be generated under excitation of 365 nm ultraviolet light. By regulating and controlling the light-emitting characteristic difference of BBI-ZnCl2 and BBI-ZnCl4, the material can realize dynamic information hiding and display (such as pattern switching after ultraviolet irradiation / closing), and has outstanding advantages in the field of encryption and anti-counterfeiting. In addition, the material has the characteristics of cheap raw materials, good stability and no toxicity, and is also suitable for the fields of fire safety, biological imaging and the like. The preparation method has the innovativeness of the synthesis method and the practicability of the functional material, and has a wide industrialization prospect.

The invention relates to the technical field of photoelectrocatalysis, in particular to a Co (II) coordination polymer photoelectrode crystalline material and a preparation method and application thereof. The Co (II) coordination polymer {[Co (H2O) (Br-BDC) (BMIP)]. H2O} n is obtained from organic ligands BMIP, H2 (Br-BDC) and cobalt salt through a solvothermal method, cobalt (II) ions serve as three connection nodes, BMIP and H2 (Br-BDC) ligands serve as bridging ligands to be in mutual bridging, a two-dimensional honeycomb structure is formed, and a three-dimensional supramolecular structure is formed between layers through intermolecular hydrogen-bond interaction and pi-pi stacking. Wherein H2 (Br-BDC) is 2, 5-dibromoterephthalic acid, BMIP is 1, 3-bis (dimethylimidazolyl) propane, and n is a positive integer. The Co (II) coordination polymer shows relatively good photoelectric property, has the potential of serving as a photoelectrode material, has good optical and electrical characteristics, can be used for constructing an efficient photoelectrocatalysis water decomposition system, and has an application prospect in the aspects of photoelectric hydrolysis water oxidation and the like.

To provide a method for purifying nucleic acid.SOLUTION: Provided is a method for purifying nucleic acid comprising: a first step of crystallizing nucleic acid in a solution containing a hydrophilic organic solvent; and a second step of drying the crystallized nucleic acid in air at a temperature of 45°C or higher to 60°C or lower and a relative humidity of 40% or more to 90% or less, the nucleic acid containing 5'-disodium guanylate 7-hydrate or 5'-disodium inosinate 7.5 hydrate.SELECTED DRAWING: Figure 2

The invention discloses a preparation method of a patterned organic single crystal intrinsic linear polarization light-emitting device, and relates to the technical field of polarization optics, and the preparation method comprises the steps: preparing a large-area organic single crystal layer, forming an array light-emitting region, and electrically connecting the organic single crystal layer and the light-emitting region. The polarized light-emitting device comprises a substrate, an organic single crystal layer, an insulating layer, a functional layer and an electrode, a large-area organic polarized light-emitting single crystal is grown under the assistance of a liquid level, an ink-jet direct writing technology is combined, a local contact area is constructed by utilizing the liquid-phase polymer insulating layer, and therefore construction of the patterned organic single crystal intrinsic linear polarized light-emitting device is achieved. The challenges of growth of intrinsic linear polarization light-emitting organic single crystals and construction of patterned polarization light-emitting devices are solved, and application of organic single crystal polarization light-emitting devices in the field of next-generation novel polarization display and polarization imaging is expected to be promoted.