38 results about "Air sensitivity" patented technology

The invention relates to a preparation method of a polyurethane-polymethyl methacrylate block copolymer. The preparation method comprises the following steps: preparing terminal hydroxyl polymethyl methacrylate; and preparing a block copolymer. The preparation method provided by the invention has the beneficial effects that (1) terminal hydroxyl polymethyl methacrylate is prepared by using an ARGET ATRP method, the structure, molecular weight and molecular weight distribution of the polymer can be controlled, and the concentration use level of the catalyst used in the reaction system is very low and can be reduced to dozens of ppm or even lower, and furthermore, the air sensitivity of the reaction system can be reduced, and a little amount of air can exist; and (2) terminal hydroxyl polymethyl methacrylate is prepared by using the ARGET ATRP method and reacts with diisocyanate, so that the novel polyurethane-polymethyl methacrylate block copolymer is obtained.

The invention relates to a preparation method of a tin oxide fiber precursor and tin oxide crystal fibers. The preparation method comprises the following steps: carrying out a replacement reaction on halides of tin and potassium (sodium) acetate to synthesize the tin oxide fiber precursor which takes acetic acid as a ligand; concentrating a precursor solution to obtain a spinning solution and carrying out centrifugal silk spinning to obtain tin oxide precursor fibers; and carrying out procedures of special atmosphere pre-treatment, high-temperature heat treatment and the like on the precursor fibers to obtain the tin oxide crystal fibers. According to the preparation method, the long-diameter ratio of the tin oxide crystal fibers is greater than 1000, the tensile strength of the fibers is 0.8GPa-1.1GPa, the whiteness of the fibers is good and the color and luster of the fibers are soft. The preparation method is simple in preparation process, moderate in condition and stable in quality of fibers in batches; spinning sol does not go bad after being placed for a long time. The tin oxide crystal fibers can be applied to the fields of photocatalysis, air sensitivity, humidity sensitivity and the like. The tin oxide fiber precursor can also be used for preparing oxide thin films, nano powder and nano wires or preparing tin-containing functional materials including nano tin oxide fibers and the like by an electrostatic spinning method.

The present invention relates to a sample transfer device and a transfer method. The device includes: a sample stage, the sample stage is used for placing samples; a sealing cover, the sealing cover includes a cover body, the cover body is covered on the sample stage, and the cover body is provided with a ventilation hole; elastic A sealing suction assembly, the elastic sealing suction assembly elastically presses the ventilation hole of the sealing cover, and enables the ventilation hole to communicate with the suction channel when the elastic sealing suction assembly is moved away from the ventilation hole . The invention has both positive and negative pressure transfer modes, is suitable for different sample transfer requirements, and the cost can be reduced by an order of magnitude, which is more conducive to popularization and application; for general air-sensitive samples, it saves the trouble of separately configuring vacuuming and other equipment, and can directly Air-sensitive samples are kept in a vacuum, and the new device enables better isolation of the atmospheric environment during transfer.

The invention discloses an electrostatic spinning synthesis method for an In2O3 octahedron. The electrostatic spinning synthesis method for the In2O3 octahedron comprises the following steps: mixing saccharose, tartaric acid and dimethylformamide, then adding ethanol, soluble indium salts and polyvinylpyrrolidone in an obtained mixture, and stirring until the mixture is transparent to obtain a precursor spinning solution; and carrying out electrostatic spinning on the precursor spinning solution to obtain precursor fibers, and then carrying out heat treatment on the obtained precursor fibers to obtain the In2O3 octahedron. By an electrostatic spinning technology, a size-adjustable cubic bixbyite type In2O3 octahedron structure is synthesized. The electrostatic spinning synthesis method forthe In2O3 octahedron has the advantages of wide raw material sources, low price, easiness in regulation and control of spinning parameters, good product morphology repeatability, narrow particle sizedistribution range and the like, and thus, the electrostatic spinning synthesis method for the In2O3 octahedron has potential application value in the field of air sensitivity.

A method for measuring an air sensitivity of a global positioning system (GPS) signal in a mobile terminal. A GPS signal value is obtained in the mobile terminal. The air sensitivity of the GPS signal value based on a reference GPS signal value is stored in a memory of the mobile terminal, and the air sensitivity of the GPS signal using the analyzed result is displayed on the display unit. A mobile terminal including a controller for obtaining a global positioning system (GPS) signal value is also provided. The terminal also includes a display unit for displaying an air sensitivity of the GPS by using the GPS signal value, and a memory for storing a reference GPS signal value. The controller analyzes the GPS signal value based on the reference GPS signal value, and the display unit displays the air sensitivity of the GPS using the analyzed result.

A self-sealing container, used for transferring one or more air sensitive samples between vacuum systems, includes a housing with a cavity that holds the sample(s), and a lid disposed on top of the housing. The lid is configured to interface with the housing to form a seal over the cavity when the lid is closed. At least two flexure systems, each coupled to the housing and the lid, are disposed on opposing sides of the housing. The flexure systems apply forces to the lid that move the lid horizontally and vertically above the housing, into an open position. A pneumatic actuator, movably coupled to the housing and the lid, that is actuated by a change in ambient pressure. When actuated, it applies forces that move the lid horizontally and vertically to the closed position, in opposition to and in excess of the forces applied by the flexure systems.

The invention belongs to the technical field of the chemical detection equipment, and specifically relates to a freezing conveying sample-injection device and method for element analyzer special sample detection. The freezing conveying sample-injection device for element analyzer special sample detection comprises a glove box, an electronic scale, an element analyzer, a freezing device and a precise sample injection device; the electronic scale and the freezing device are arranged in the glove box, a sample outlet of the glove box is connected with a sample inlet of the precise sample-injection device, the sample outlet of the precise sample-injection device is connected with the sample inlet of an element analyzer. By adopting an innovative idea for directly converting the liquid sample into a solid sample to detect, the problems that the existing detection equipment cannot accurately detect carbon, hydrogen, nitrogen, sulfur and oxygen elements in the liquid sample and an air sensitive sample and the organic elements in the liquid sample with strong volatility cannot be detected are solved.