37results about How to "Special physical and chemical properties" patented technology

The invention discloses a method for detecting various pesticide residues in tobacco by utilizing a multiwalled carbon nanotube. The method is characterized in that an organic solvent is used for extraction; the multiwalled carbon nanotube is used as a reverse solid phase dispersion adsorbent; the tobacco samples are purified through vortex and centrifugation; a high performance liquid chromatography-tandem mass spectrum coupled technology and a gas chromatography-tandem mass spectrum coupled technology are combined to realize the synchronous detection of various pesticide residues in the tobacco. According to the method, the multiwalled carbon nanotube is used as the reverse solid phase dispersion adsorbent, so that the purification effect, the influence on the adsorption of the target analyte due to the frequently-used polar adsorbents is eliminated while the matrix effects are reduced, and a cleaner solution is provided to decrease the maintenance of the instrument in the using process; the multiwalled carbon nanotube is low in preparation cost and less in dosage and has the effect of greatly reducing the experimental cost; the method provided by the invention has the advantages of being correct in measurement, high in sensitivity and good in repeatability, and has the effect of satisfying the requirement for rapidly analyzing and detecting the large batch samples.

The invention provides an eye drop containing tafluprost, comprising tafluprost and a hydrophilic polymer, wherein the hydrophilic polymer is selected from polycarbophil or carbomer, and the hydrophilic polymer The content of the substance is 0.4 to 1.0%. The drug depot that can be formed by the eye drops of the present invention has the effect of slowly releasing drugs, avoids rapid elimination of drugs, and improves bioavailability; the preparation method of the eye drops is simple and easy, and is suitable for industrial production.

The invention relates to an analysis method for quantitative determination of super multi-target aroma components in tobacco, which belongs to the technical field of tobacco component detection, and is characterized in that: after the tobacco sample is soaked in an acid buffer solution and extracted with an organic solvent, multi-walled carbon nanotubes are used as an inverse solid Phase-dispersed adsorbent, the sample is purified by vortex and centrifugation, combined with gas chromatography-tandem mass spectrometry technology to realize the simultaneous detection of 345 aroma components in tobacco. The invention has the advantages of simple and fast operation, high flux, low cost, less solvent consumption, environmental friendliness, wide range of analyzable compounds, high accuracy, good precision, high sensitivity and good repeatability, etc. The need for rapid analysis and detection of components.

The RE fodder additive consists of RE nitrate 35-45 wt%, RE chloride 35-45 wt%, sodium humate 4.5-5.5 wt%, ferrous sulfate 0.75-0.85 wt%, manganese sulfate 0.35-0.45 wt%, zinc sulfate 0.35-0.45 wt%, sodium citrate 1.5-2.5 wt% and Chinese medicinal stone 10-13 wt%. The additive has RE nitrate, RE chloride and sodium humate as main material, Chinese medicinal stone with nourishing health care function as supplementary material and trace elements essential for animal to grow, and can activate the growth factor in animal body, promote enzyme conversion, raise fodder converting rate, speed the growth of animal and strengthen the immunity of animal. Sodium humate added as biological stimulator can regulate the gastrointestinal function of animal, promote digestion, prevent disease and raise immunity.

The invention belongs to thel field of magnetic composite material synthesis technology, and particularly discloses a preparation method of a magnetic ordered mesopore Fe3O4@MCM-48 composite adsorbingmaterial. The preparation method includes steps of combining a ferrite Fe3O4 grain and a mesoporous molecular sieve MCM-48; roasting in a muffle furnace at 450-650 DEG C, so as to obtain the Fe3O4@MCM-48 magnetic mesopore composite adsorbing material with a core-shell structure. The method is low in cost, low in toxicity, simple in operation, gentle in condition, and short in consumed time; the prepared material has magnetism and the mesoporous duct of the molecular sieve; the preparation method has huge prospect in absorption and separation, and drug carrier.

The invention discloses a nanocomposite, a method for preparing the nanocomposite, and a lithium ion battery. The nanocomposite is composed of a polyaniline nanolayer at the top, a TiO2 / oxidized graphene composite layer at the centre and a polyaniline nanolayer at the bottom, wherein the polyaniline nanolayer is a nanometer-rod-shaped polyaniline array; the TiO2 / oxidized graphene composite layer is formed in a manner that TiO2 nano-particles are distributed in the net structure of multi-layer oxidized graphene. The nanocomposite disclosed by the embodiment of he invention is good in cycling stability and high-rate discharge performance, nontoxic, environmentally friendly, and cheap in price; the preparation method of the nanocomposite is easy to operate, environmentally friendly and high-efficiency.

The invention discloses a flaky copper powder carrying nanometer copper crystals and a preparation method thereof. The thickness of the copper flakes in the flake copper powder is 100-500nm, and the surface of the copper flakes is uniformly attached with nano-level copper crystal particles; the preparation method includes the following steps: firstly, the copper powder and other metal powders are used to prepare a copper alloy composite powder between layers; Then the copper alloying composite powder is passivated and then subjected to dealloying treatment to remove other metals in the copper alloying composite powder; finally, the dealloyed powder is cleaned and dried to obtain flake copper powder carrying nano-copper crystals; the technical scheme of the present invention A new type of flaky copper powder structure is prepared, which has better electrical conductivity and catalytic properties; the preparation process shortens the ball milling time, simplifies the process flow, reduces the introduction of impurities, is simple and easy to operate, and is suitable for large-scale industrial production.

The invention belongs to the technical field of preparation of natural polymer functional materials, and discloses a xylan-based hydrogel with dual response to temperature and pH, a preparation method and application thereof. The preparation steps of the temperature and pH dual-response xylan-based hydrogel are: dissolving xylan in hot water to obtain a xylan solution; adding N-isopropylacrylamide and propylene to the xylan solution Amide, then add cross-linking agent, blow nitrogen gas, add photoinitiator, mix evenly, cool to room temperature, place in ultraviolet radiation reactor, irradiate with ultraviolet light at room temperature, then seal and place reaction at room temperature, after the reaction After washing with deionized water, the obtained solid is the xylan-based hydrogel with dual response to temperature and pH. The preparation method of the present invention is easy to operate and has environmental friendliness; the obtained xylan-based hydrogel with dual response to temperature and pH has biocompatibility, good slow-release behavior for drugs, and releases drugs in simulated intestinal physiological fluid The amount reaches 80%.

The invention provides a medicine for treating eyesight. The medicine comprises the following components in parts by weight: 10-20 parts of gel; 1 to 15 parts of sodium hyaluronate; 1 to 3 parts of lutein; 3-5 parts of glycerol; 6-9 parts of a rhodiola rosea extract; 5-10 parts of a suberect spatholobus stem extract; 3-8 parts of a chamomile extract; 3-8 parts of a garden balsam stem extract; 6-9parts of a cassia seed extract; 5-8 parts of an astragalus extract; and 8-10 parts of a radix clematidis extract. According to the medicine, a traditional Chinese medicine and western medicine combined technology is utilized, traditional Chinese medicine extracts and western medicines are scientifically combined according to a formula, the treatment effect is good, and drug resistance is not likely to be generated. The medicine can relieve visual fatigue, treat ocular pseudoapproximation, relieve amblyopia and radically treat visual impairment such as eye dryness, eye itching and eye distension.

The invention belongs to the field of composite hydrogel materials, and discloses a carbon nanotube reinforced carboxymethyl xylan / polyacrylic acid composite hydrogel and a preparation method thereof. Dissolve acrylic acid in deionized water, then add carboxymethyl xylan, ferric chloride, carbon nanotubes and cross-linking agent to mix evenly, pass nitrogen to remove oxygen, add initiator to initiate reaction, and then add cross-linking accelerator The cross-linking reaction is carried out at a temperature of 50-70 DEG C, and the reaction product is washed and dried to obtain a carbon nanotube reinforced carboxymethyl xylan / polyacrylic acid composite hydrogel. The present invention adopts biodegradable, biocompatible and special xylan of physical and chemical properties to prepare hydrogel, and introduces acrylic acid and Fe 3+ Perform physical cross-linking and ion cross-linking to enhance the strength of xylan-based hydrogel. The invention expands the industrial application of the xylan type hemicellulose, and provides an important and effective way for the high-value utilization of the hemicellulose.