66results about How to "Improve ion transmission efficiency" patented technology

A filtered cathodic-arc plasma source of lower plasma losses and higher output plasma current to input current efficiency is disclosed. Plasma filtering is accomplished in a right angle bend magnetic filter arranged to include the effects of at least three added magnetic coils located at the right angle bend of the filter path. These magnetic coils and other filter attributes, including an array of transverse fins and a magnetic cusp trap in the filter path, achieve desirable magnetic flux paths, lower plasma collision losses and reduced undesired particle output from the plasma filter. Multiple cathode sources, multiple plasma output ports, Larmour radius influence, equipotential magnetic flux lines and electron/ion interaction considerations are also included in the plasma source. Application of the plasma source to film coating processes is included.

A method of improving the detection limits of a mass spectrometer by: generating sample ions from an ion source; storing the sample ions in a first ion storage device; ejecting the stored ions into an ion selection device; selecting and ejecting ions of a chosen mass to charge ratio out of the ion selection device; storing the ions ejected from the ion selection device in a second ion storage device without passing them back through the ion selection device; repeating the preceding steps so as to augment the ions of the said chosen mass to charge ratio stored in the second ion storage device; and transferring the augmented ions of the said chosen mass to charge ratio back to the first ion storage device for subsequent analysis.

The invention belongs to the technical field of mass spectrographies, and relates to an ion transmission system for an inductively coupled plasma mass spectrometry. The ion transmission system comprises an ion sampling cone, an interception cone, an extraction lens, an ion deflecting electrode and ion focusing lenses, wherein the centers of all the parts are on coaxial horizontal lines; space electric field distribution is generated under a DC voltage; ions deflect, focus and are transmitted under the action of the electric field; photons and neutral particles in a sample are free from the action of the electric field, transmitted linearly, and blocked while meeting the ion deflecting electrode; electrified ions are guided by the electric field, bypass the ion deflecting electrode, and focus into an ion beam under the action of the electric field of the focusing lenses, and then are transmitted to a mass analyzer. The ion transmission system has the advantages that the structure is simple; the use is convenient; interference signals generated due to the entering of the photons and the neutral particles can be removed effectively; the ion transmission efficiency and the sensitivity of the inductively coupled plasma mass spectrometry are improved.

The invention discloses a method of preparing a g-C3N4/silicon carbon cathode material of a lithium ion battery by electrostatic spinning and an application thereof. The method comprises the followingsteps: (1) adding polyvinylpyrrolidone into N,N-dimethylformamide to obtain a polyvinylpyrrolidone solution; (2) adding nano silicon into the polyvinylpyrrolidone solution to obtain a mixed solutionA; (3) adding urea into the mixed solution A to obtain a mixed solution B; (4) carrying out electrostatic spinning on the mixed solution B to obtain a silicon polymer composite material; and (5) putting the silicon polymer composite material in an inert gas environment, heating the material to 200-400 DEG C, keeping the temperature constantly for 3-6 hours, and heating the material to 500-700 DEGC and keeping the temperature constantly for 3-6 hours to obtain the g-C3N4/silicon carbon cathode material of the lithium ion battery. The g-C3N4/silicon carbon cathode material of the lithium ion battery has the advantages of being high in specific capacity, stable to recycle, good in rate performance and the like.

The invention discloses a normal pressure micro glow discharge desorption mass spectrum ion source based on magnetic field constraint. The normal pressure micro glow discharge desorption mass spectrum ion source based on magnetic field constraint comprises an ion source body used for generating normal pressure micro glow discharge, a Helmholtz coil used for providing a uniform magnetic field for restraining a micro glow discharge plasma and a sample ion, and an annular electrode used for generating a static electric field to assist in focusing charged particles, wherein the ion source body is located in the magnetic field generated by the Helmholtz coil, and ion current generated by the ion source body passes an electric field generated by the annular electrode. The invention further discloses a mass spectrometer adopting the normal pressure micro glow discharge desorption mass spectrum ion source based on magnetic field constraint. The normal pressure micro glow discharge desorption mass spectrum ion source based on magnetic field constraint and the mass spectrometer are low in energy consumption, small and exquisite in appearance, simple in structure and easy and convenient to operate, have little influence on the outside, are high in signal enhancement degree, are free of sample pretreatment, carry out analysis quickly, can reach the purpose of harmless analysis, and are clean and free of pollution.

An ion buncher stage for a linear accelerator system is disclosed for bunching ions in an ion implantation system. The ion buncher stage may be employed upstream of one or more linear accelerator stages such that the loss of ions in the linear accelerator system is reduced. The invention further includes an asymmetrical double gap buncher stage, as well as a slit buncher stage for further improvement of ion implantation efficiency. Also disclosed are methods for accelerating ions in an ion implanter linear accelerator.

The invention provides a modified polymer electrolyte membrane, a preparation method thereof and a modified gel polymer electrolyte material. Polyvinylidene fluoride-hexafluoropropylene is modified bya blending method, so that polypropylene carbonate (PPC) is pasted onto a surface of a polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) matrix in a colloidal state by intermolecular interaction, the PPC and the PVDF-HFP matrix are permeated with each other, so that the purpose of introducing the PPC into the PVDF-HFP matrix is achieved; and the PPC contains C=O polar bonds, and the ion conductivity, the mechanical property and the electrochemical stability of the modified polymer electrolyte membrane are improved by the introduction of the polar bonds; and an electrolyte is absorbed bythe modified polymer electrolyte membrane provided by the invention to obtain a modified gel polymer electrolyte material, and the electrolyte material is high in transmission efficiency, long in cycle lifetime and good in electrochemical stability.

The invention discloses a method for detecting the in-vivo direct acting component in a periploca forrestii schltr medicinal material. An UHPLC-Q-TOF-MS (Ultra-High Performance Liquid Chromatography-Quadrupole-Time Of Flight-Mass Spectrometry) technology is adopted; a serum fingerprint chromatogram and a blank rat serum fingerprint chromatogram are compared after a periploca forrestii schltr extractive and a rat oral periploca forrestii schltr extractive; the migration component in rat blood after the oral periploca forrestii schltr extractive is determined; the in-vivo direct acting componentin the periploca forrestii schltr medicinal material is definite; and thus, reference is provided for effect material basis that periploca forrestii schltr plays a pharmacological role and quality control.

The invention relates to the technical field of a mass spectrometer ionization device, and particularly relates to an ion source of a proton transfer mass spectrometer, which comprises an insulating medium cavity, a repulsion electrode, a gas inlet, a radio frequency coil, a leading-out electrode, an injection port and an ion funnel type drift tube, wherein the upper end of the insulating medium cavity is sealed, the lower end of the insulating medium cavity is opened, and the opened end is connected with the leading-out electrode; the radio frequency coil surrounds at the periphery of the middle of the insulating medium cavity; the repulsion electrode is arranged inside the sealed end of the insulating medium cavity; the insulating medium cavity is inserted into the upper end of the ion funnel type drift tube and sealed; and the central axis of the insulating medium cavity is coaxial with the central axis of the leading-out electrode. According to the ion source of the proton transfer mass spectrometer, the ionization efficiency, the ion transmission efficiency and leading-out efficiency of an ionization source are improved, so that the sensitivity of the mass spectrometer is improved.

A differential pumping system in which a vacuum chamber is manufactured to have a plurality of vacuum pumps and conductance limit plates between the vacuum pumps. The differential pumping system in which an ion is implanted from an ionization source, passes through the vacuum chamber and is detected by a detection unit includes a plurality of vacuum pumps in the vacuum chamber and one or more conductance limit plates between the vacuum pumps, and the conductance limit plates form an angle less than 90° with the transmission direction of the ion. According to such a constitution, higher degree of vacuum and the ion transmission efficiency are maintained without increasing the length of the vacuum chamber. Furthermore, it is possible to minimize the attenuation of an ion detection signal due to a collision with a neighboring neutral molecule, improving the sensitivity of an ion detection device.

A mass spectrometer having a multi-stage differential pumping system with an ion lens provided in a partition wall separating a second intermediate vacuum chamber and a third intermediate vacuum chamber, the incircle radii of ion guides and the size of the opening of the ion lens are determined so that the circumferential edge of the opening is located outside the circumferential surface of a virtual tubular body straightly connecting the incircle at the rear edge of the second ion guide in the front stage and the incircle at the front edge of the third ion guide in the rear stage. Although the ion lens is located in between, the radio-frequency electric field created by the second ion guide can be effectively connected to the radio-frequency electric field created by the third ion guide through the opening of the ion lens.

The invention discloses a vinylidene fluoride copolymer and a preparation method thereof, wherein the molecular structural formula of the vinylidene fluoride copolymer is defined in the specification,and in the formula, the unit A is a vinylidene fluoride structural unit, the unit B is a vinyl alcohol structural unit, the C unit is a perfluorovinyl ether lithium sulfonate structural unit, m is aninteger from 0 to 10, and n is an integer from 1 to 6. The preparation method comprises the following steps: copolymerizing a vinylidene fluoride monomer, a vinyl ester monomer and a perfluorovinyl ether lithium sulfonate monomer by a one-step method, and adding alkali for hydrolysis to obtain the vinylidene fluoride copolymer. The preparation method disclosed by the invention is simple in process and low in cost, and provides a new technical thought for PVDF modification; and the prepared vinylidene fluoride copolymer has high ion transmission efficiency, does not have the defect of poor compatibility of blended PVDF, and has great application prospects.

The invention discloses an ion transmission interface device, and the device comprises a shell, a separation cone, an ion channel, a conductive plate and an insulating plate; the shell is used for providing a vacuum cavity environment for transmission of charged ions; the separation cone is used for guiding charged ions to enter the ion channel; the conductive plate is mounted on the insulating plate; the ion transmission hole of the conductive plate and the ion transmission hole of the insulating plate are in the same horizontal line, and the direction of the separation cone faces the ion transmission hole; the potential difference between the conductive plate and the separation cone is gradually decreased in the direction from the conductive plate to the separation cone, and charged ionssequentially penetrate through the conductive plate, the insulating plate and the separation cone through the ion transmission hole according to the gradient of the potential difference and enter theion channel. The technical problem to be solved by the invention is to improve the ion transmission efficiency of charged ions from an ion source to an ion channel while preventing uncharged particles and other impurities from entering an ion transmission hole, thereby improving the sensitivity of a mass spectrometer.

The invention discloses a solid electrolyte material with low interface impedance and a preparation method of the solid electrolyte material. The material comprises a major structure with a chemical formula Li1+x+yAlx(Ti,Ge)2-xSiyP3-yO12, and lithium iodide dispersed in the major structure, wherein the major structure of the material is an NASICON fast ion conductor; x is greater than 0 and less than or equal to 0.4; y is greater than 0 and less than or equal to 0.1; and the mass percentage a of lithium iodide in the material is greater than 0 and less than or equal to 10%. The preparation method of the material comprises the following steps of (1) synthesizing the major structure: selecting raw materials according to a stoichiometric equation of the solid electrolyte material and performing planet ball milling, cold pressing and a solid-phase reaction to obtain the major structure of the dense flaky solid electrolyte material, and (2) performing modification treatment: soaking a sample obtained in Step (1) in a lithium iodide aqueous solution, performing heating for some time, taking the sample out, cleaning the sample and performing vacuum drying treatment. According to the solid electrolyte material and the preparation method, a lithium iodide material with lithium ion conduction property is added to a solid electrolyte layer, so that the interface impedance is reduced, a three-dimensional ion conduction network is formed, and the ion conductivity is improved.