56 results about "Electrical mobility" patented technology

A high performance liquid chromatography system employs a nebulizer with a flow restriction at the exit of its mixing chamber to produce finer droplets, and an adjustable impactor for increased control over droplet sizes. Downstream of the mixing chamber, the nebulizer can incorporate tubing that is permeable to the sample liquid, to promote aerosol drying through perevaporation. A condensation particle counter downstream of the nebulizer uses water as the working medium, and is adjustable to control threshold nucleation sizes and droplet growth rates. A particle size selector employing diffusion, electrostatic attraction or selection based on electrical mobility, is advantageously positioned between the nebulizer and the CPC.

A multi-stage differential mobility analyzer (MDMA) for aerosol measurements includes a first electrode or grid including at least one inlet or injection slit for receiving an aerosol including charged particles for analysis. A second electrode or grid is spaced apart from the first electrode. The second electrode has at least one sampling outlet disposed at a plurality different distances along its length. A volume between the first and the second electrode or grid between the inlet or injection slit and a distal one of the plurality of sampling outlets forms a classifying region, the first and second electrodes for charging to suitable potentials to create an electric field within the classifying region. At least one inlet or injection slit in the second electrode receives a sheath gas flow into an upstream end of the classifying region, wherein each sampling outlet functions as an independent DMA stage and classifies different size ranges of charged particles based on electric mobility simultaneously.

The invention relates to a material for conductor tracks made of copper alloy containing Cu > 90 At. %, whereby said material contains 0.5 to 10 At. % of one or more elements from the group consisting of Ca, Sr, Ba, Sc, Y, lanthanide, Cr, Ti, Zr, Hf, Si; and 0 to 5 At. % of one or more elements from the group consisting of Mg, V, Nb, Ta, Mo, W, Ag, Au, Fe, B. Said material has a low electrical resistance, good adhesion to the glass substrate, excellent oxidation resistance, and a low electromigration rate.

In order to provide a differential mobility analyzer and the like that allows (i) easy increase of an upper limit of particle size of charged particle which can be classified and (ii) analysis of charged particles whose particle size is variable, a DMA (Differential Mobility Analyzer) includes: a classification tank in which an inlet electrode having an inlet slit, an intermediate electrode having a slit, and an outlet electrode having an outlet slit are arranged in sequence in such a manner that adjacent electrodes are disposed opposing each other at predetermined intervals; a gas supply section supplying the classification tank with sheath gas; and a voltage generator applying a predetermined voltage between the electrodes disposed opposing each other, the classification tank including a first classification section and a second classification section each formed by the electrodes disposed opposing each other, and the gas supply section controlling a flow rate of the sheath gas to be supplied to the classification tank individually per first classification section and second classification section.

The present invention relates to a method and system for determining particle properties. Such properties may for example be charge, size, drift, etc. The method comprises determining (110) an electric mobility distribution based on detection of individual particles. The latter may be performed for a single particle over time, for a plurality of particles at the same time or in a combination thereof. The method also comprises deriving a particle property based on a periodicity in the electric mobility distribution.

Prior work on differential mobility analysis (DMA) combined with mass spectrometry (MS) has shown how to couple the output of a planar DMA with the atmospheric pressure inlet of an atmospheric pressure ionization mass spectrometer (APCI-MS). However, because the ion inlet to APCI-MS instruments is a round orifice, while conventional DMA geometries make use of elongated slits, the coupling of both has attained less resolving power or tolerated a smaller sample flow rate than a DMA alone. The present invention overcomes these limitations with an axial DMA of cylindrical symmetry using more than two electrodes. The configuration is related to that previously proposed by Labowsky and Fernández de la. Mora (2004, 2006), where ions with a critical electrical mobility are brought into the symmetry axis of the DMA. Ions with this critical mobility are now optimally transmitted into the MS, with much higher resolution than possible in planar DMAs. In a preferred embodiment of this DMA facilitating DMA-MS coupling, one DMA electrode intersecting the symmetry axis is relatively planar.

The invention describes a system and method to separate ions (and charged particles) suspended in gas based on their ion electrical mobility. Most common ion mobility analyzers involve two parallel plate (or concentric cylinder) elements (electrodes) between which is imposed an electrical field perpendicular to a sheath gas flow field between the cylinders. Separation occurs because high mobility ions tend to follow the electrical field while low mobility ions tend to follow the flow field. This invention describes various configurations of electrical elements and sheath gas flow fields for ion mobility separation devices with unique performance characteristics. These characteristics include devices in which: the ion inlet and outlet are on the same element; the inlet and outlet are at the same voltage; the outlet is upstream from the inlet; the outlet is on the axis; the inlet is on the axis; and the ions are focused on the outlet.

Instruments are disclosed for analyzing ions from about 1000 to 10,000,000 Daltons by controlling a gaseous medium through which the ions travel under the influence of an electric field so that properties of the ions, such as diameter, electrical mobility, and charge, are measured. One embodiment of the disclosed instruments include an ion source, a nozzle, a jet relaxation region, an ion accumulation region, an electronic gate, a flow chamber and an ion detector.

A particle size distribution measuring system 1 sets a reference voltage in a DMA 300 to a voltage value U, and executes the classifying of aerosol particles based on electrical mobility, in an electric field to which the voltage value U is supplied. When a predetermined condition is not satisfied, an analyzing device 600 causes a sum of the voltage value for the previous classifying (previous value) and the voltage value U to be re-set in the DMA 300 and causes the classifying of the aerosol particles to be executed again. A particle measuring device 400 defines a first measurement result as a measurement result M1, and defines a result of the re-measurement as a new measurement result Mx every time the measurement is thereafter repeated. An analyzing device 600 calculates a ratio of the measurement result Mx to the measurement result M1, and confirms that the condition is satisfied when the calculation result is a prescribed value or smaller, while confirming that the condition is not satisfied when the calculation result is larger than the prescribed value.

A parallel plate dimensional electrical mobility separator and laminar flow water condensation provide rapid, mobility-based particle sizing at concentrations typical of the remote atmosphere. Particles are separated spatially within the electrical mobility separator, enlarged through water condensation, and imaged onto a CCD array. The mobility separation distributes particles in accordance with their size. The condensation enlarges size-separated particles by water condensation while they are still within the gap of the mobility drift tube. Once enlarged the particles are illuminated by a laser. At a pre-selected frequency, typically 10 Hz, the position of all of the individual particles illuminated by the laser are captured by CCD camera. This instantly records the particle number concentration at each position. Because the position is directly related to the particle size (or mobility), the particle size spectra is derived from the images recorded by the CCD.

The invention discloses an aerosol mass spectrometer for measuring chemical components of nanoparticles. The aerosol mass spectrometer comprises a nano-scan electromobility particle size spectrometer,a first differential chamber, a second differential chamber, a photo ionization chamber and a reflective type time-of-flight mass spectrum apparatus, wherein the aerosol outlet of the nano-scan electromobility particle size spectrometer is connected with the inlet of the first differential chamber; the outlet of the first differential chamber is connected with the inlet of the second differentialchamber; the outlet of the second differential chamber is connected with the inlet of the photo ionization chamber; and the outlet of the photo ionization chamber is connected with the reflective type time-of-flight mass spectrum apparatus. By virtue of the nano-scan electromobility particle size spectrometer, charge, particle size selection and particle spectrum analysis of the nanoparticles arerealized by the aerosol mass spectrometer, so as to perform real-time and online measurement and acquisition of the chemical component information of the nanoparticles with particle sizes of smallerthan 60nm; and the detection process is simple, and quick and high-efficiency transmission of the nanoparticles are realized.

The invention belongs to the technical field of environment aerosol, and particularly relates to a 1-3nm monodisperse aerosol generating system. The 1-3nm monodisperse aerosol generating system mainly comprises an electrospray generator, a high-resolution difference electromobility analyzer and an aerosol electrometer. A series of standard ions are screened by the high-resolution difference electromobility analyzer so as to obtain the required monodisperse aerosol; the aerosol is measured by the aerosol electrometer with the efficiency no less than 99%, and the measurement accuracy is ensured; the monodisperse nano aerosol is obtained by the system; aerosol with severe monodispersity at the geometric particle size range of 0.7-3nm can be obtained by utilizing an organic solution of tera alkyl ammonium halide and a water solution of ammonium acetate, and the obtained standard positive and negative ion aerosol concentrations are respectively within the concentration ranges of 10<6>-10<7> piece/cm<3> and 10<5>-10<6> piece/cm<3>.

A new instrument for electrical-mobility based size segregation of particles at high resolution is described. The instrument called the high-flow dual-channel differential mobility analyzer (HD-DMA) comprises of five flows: a polydisperse aerosol flow, a clean sheath flow, two monodisperse sample flows and a residual excess flow. High resolution measurements are possible because of the large sheath flowrates that are permissible in this instrument.

Theory and design of a new electrical-mobility based instrument for measurement of aerosol particle size distributions in real time is presented. Miniature Electrical Aerosol Spectrometer has a rectangular cross-section with two main regions: the Electrostatic Precipitator (ESP) and Classifier sections. The ESP section enables charged particle injection into the classifier section in a narrow range of streamlines at the desired location. The injected charged particles are then segregated based on their electrical mobility in the classifier section and collected on a series of plates that are connected to electrometers. Real-time particle size distribution measurements can be inferred from the electrometer signal strengths with the knowledge of the instrument transfer function. A theoretical approach is developed to calculate Miniature Electrical Aerosol Spectrometer transfer function considering the non-uniformity in the electric and flow fields inside the instrument, and accounting for the instrument dimensions and its operating conditions. The theoretical predictions of size classification characteristics are seen to compare well with numerical results. The modeling results suggest that an optimal operational domain exists for Miniature Electrical Aerosol Spectrometer.

Apparatuses, methods, and systems are disclosed for analyzing particles from about 0.001 to about 1 μm in diameter by controlling a gaseous medium through which the particles travel so that properties of the particles, such as diameter, electrical mobility, and charge, are measured. One embodiment of the disclosed apparatuses includes a particle source generator, a nozzle, a chamber, an electronic gate, and a detector. Resolution of the measurements made by the disclosed apparatuses is improved by use of a mathematical deconvolution of a spread in arrival times generated by particles of different sizes and charge levels and non-ideal background flow velocity variations.

The invention discloses a flowing reaction device allowing forming and growing of new particles of atmospheric aerosol. The length of the flowing reaction device is about 22 meters. The flowing reaction device comprises four parts of a sample injection region (I), a transition region (II), a nucleation region (III) and a growing region (IV), wherein the sample injection region comprises three sample inlets and a set of water bath heating water inlets and outlets; the transition region comprises a temperature humidity detecting opening, a low-volatility substance sample inlet and a primary sampling opening; the nucleation region comprises a set of water inlets and outlets for controlling temperature of water bath, a plurality of intermediate sampling openings and a temperature humidity detecting opening formed in the upper part of the nucleation region; the growing region comprises a plurality of growing region sampling openings; the change of the particle number concentration and the change of the particle diameter of each sampling opening are detected through scanning an electrical mobility particle diameter spectrometer. The flowing reaction device disclosed by the invention can be used for researching the generative mechanism and the rising characteristic of the new particles in the atmosphere, so that the dynamics of the nucleation of the aerosol is further researched, and the flowing reaction device has the characteristics of being high in precision, good in stability, simple and convenient to operate, and the like.

Instruments are disclosed for analyzing ions from about 1000 to 10,000,000 Daltons by controlling a gaseous medium through which the ions travel under the influence of an electric field so that properties of the ions, such as diameter, electrical mobility, and charge, are measured. One embodiment of the disclosed instruments includes an ion source, a nozzle, a jet relaxation region, an ion accumulation region, an electronic gate, a flow chamber and an ion detector.

A miniature electrical-mobility aerosol spectrometer comprising a 3D-printed body comprising: (i) a single inlet section configured to receive particles to be evaluated by the spectrometer; (ii) an electrostatic precipitator section coupled to the electrostatic precipitator section; (iii) a classifier section, wherein the electrostatic precipitator section is coupled to the classifier section; and (iv) an outlet, wherein the classifier section is coupled to the outlet; a high voltage classifier plate positioned within the classifier section; and a classifier component positioned within the classifier section opposite the high voltage classifier plate, wherein the classifier component comprises sensing circuitry configured to detect particles in the classifier section, and wherein the classifier section comprises a two-sided printed circuit board, wherein the two-sided printed circuit board comprises the sensing circuitry, and wherein a first side of the two-sided printed circuit board comprises a plurality of printed collection plates.

Provided are a host material for a blue phosphor, and an organic thin film and an organic light-emitting device including the same. The host material for a blue phosphor is such that a carbazole compound is bonded around a central atom, wherein the central atom is a Group 14 element, and the carbazole compound bonded around the central atom is 3 or 4, wherein the carbazole compound includes carbazole in which an alkyl group is substituted. The host material for a blue phosphor has high triplet energy (ET) and excellent electrical mobility and thermal stability. As a result, the organic thin film, which includes the host material, and the organic light-emitting device, which includes the organic thin film, implement a deep blue color and have excellent luminous efficiency.