397 results about "Quartz crystal microbalance" patented technology

A sensor device for detecting the presence of a gas species in a gas environment susceptible to the presence of same. The sensor device may include a piezoelectric crystal coated with a sensor material having adsorptive affinity for the gas species, with an electric oscillator arranged for applying an oscillating electric field to the piezoelectric crystal to generate an output frequency therefrom indicative of the presence of the gas species when present in the gas environment, when the gas environment is exposed to the piezoelectric crystal. Another aspect of the invention involves a porous polymeric material that may be employed as a sensor material on a piezoelectric crystal sensor device, as well as a quartz microbalance holder that enables reactor gas monitoring. The sensor device alternatively may comprise an optical sensor arranged in a non-contaminating fashion in relation to the gas environment being monitored.

Quartz crystal microbalance (QCM) replaces the SAW device used in the gas chromatograph (GC) systems could result in better performance. The use of multiple vibration modes, variable vibration amplitude and overtones could make the sensor detector with self-temperature compensation capability, higher sensitivity and longer sensor life due to reduced aging rate.

The invention discloses lifetime ground test equipment for an ion thruster. By employing the equipment, special requirements of high pumping ability, small return sputtering sediment, high reliability, and high equipment integration of test equipment for lifetime tests of the ion thruster can be satisfied. The lifetime ground test equipment for the ion thruster comprises a main cabin vacuum container, a gate valve, an auxiliary cabin vacuum container, a vacuum pumping system, an ion beam target, an anti-sputtering screen, a thruster mobile mechanism, a quartz crystal microbalance QCM, a thruster divergence angle measuring system, a grid corrosion on-line monitoring system, a ground test power supply system, an equipment control system, a xenon supply system, a repressing system, a cooling water system, a pneumatic element air supply system, a liquid nitrogen storage and supply system, and a shooting illumination system. By employing the equipment, real results of the lifetime of the ion thruster can be obtained, and real and reliable test data can be provided for the evaluation of the lifetime and the reliability of the thruster.

A sensor chip assembly for use in a sensor capable of Surface Plasmon Resonance (SPR) and gravimetric sensing. The assembly comprising a transparent piezoelectric substrate (I) having a first surface and a second surface opposite to the first surface. The assembly also comprising first and second thin film metal electrodes (2,3) respectively provided on the first and second surfaces of the substrate (1). The second thin film metal electrode (3) being position on the second surface of the substrate (1) such that a light beam is capable of being transmitted through the second surface of the substrate and reflected from the first thin film metal electrode. The assembly also comprising an attenuated total reflection (ATR) coupler (11) disposed adjacent to the second thin film metal electrode (3).

A system and methods, thereof, monitor biomarkers from a patient suffering from neural injury in real-time. The system comprises a quartz crystal microbalance wherein a capture molecule specific for certain biomarkers is diagnostic of the type of neural injury, location of neural injury and the degree of severity of neural injury. The system, in particular, provides real-time continuous monitoring of a patient.

The invention discloses a tracking testing system of the resonant frequency of a quartz crystal microbalance and a method thereof, the tracking testing system comprises an analog circuit testing network and is characterized in that the tracking testing system further comprises a digital frequency synthesizer, a homologous frequency multiplication signal generation module, a high-speed analog-digital converter ADC, a signal processing module and a feedback tracking module, wherein the high-speed analog-digital converter ADC is used for generating a frequency multiplication signal which is homologous with a driving signal and has the frequency of 4/(2N plus 1); a voltage signal outputted by a sampling module is amplified by an operational amplifier and then directly enters into the high-speed analog-digital converter ADC for carrying out conversion and output; the signal processing module is used for calculating the serial complex admittance of a QCM chip according to Kirchhoff laws, and approximately calculating the difference between the current frequency and the series resonant frequency of the QCM and the serial impedance of the chip; and the feedback tracking module is used for changing the output frequency of the digital frequency synthesizer, leading the output frequency to approximate the serial resonant frequency of the QCM, and repeating the implementation for realizing the tracking of the serial resonant frequency of the QCM.

A method for monitoring the deposition of one or more organic materials dispersed in an aqueous medium in a papermaking process comprising: measuring the rate of deposition of the organic materials from the aqueous medium on-to a quartz crystal microbalance having a top side contacting with the aqueous medium coated with a layer containing a non-swelling epoxy resin or a silicon containing polymer, and a second, bottom side isolated from the aqueous medium is disclosed. Additionally, a method for measuring the effectiveness of an inhibitor that decreases the deposition of the organic materials in a papermaking process is also disclosed.

The invention relates to an ionic liquid system electrochemical process in-situ research device. According to the device, an in-situ photo-electrochemical tank is adopted as a core. Under the control and adjustment of a multifunctional automatic adjusting rack, devices such as a flow injection analyzer, an in-situ infrared spectrometer, a Raman spectrometer, a metallurgical microscope, a multi-channel electrochemical workstation, a quartz crystal microbalance, and the like can be applied in combination. Detection liquid is placed in the in-situ photo-electrochemical tank, and a reaction process is subjected to real-time monitoring by using a computer control system. With the device provided by the invention, on a basis of conventional electrochemical tests, morphology, structure, composition, concentration change characterizations upon electrode surface/interface sediment, electrolyte, decomposition products, gas product, and the like can be realized, and powerful support can be provided for ionic liquid electrochemical process researches. The device has the characteristics of compact structure, high operation automation degree, precise detection, reasonable design, and the like.

The invention relates to a miniaturized total analysis device formed by a six-channel microfluidic chip and a quartz crystal microbalance. The device comprises the six-channel microfluidic chip with a pump valve structure, an upper clip, a lower clip, the quartz crystal microbalance and a bearing box of the quartz crystal microbalance, wherein the microfluidic chip is positioned between the upperclip and the lower chip, and is communicated with an outside source device through the design of clips; the six-channel microfluidic chip with a pump valve structure is in a sandwich structure, and the lower substrate is provided with an air passage and six sample outlets; the upper substrate is provided with the sample inlets and six branches of liquid passages which are in annular symmetrical distribution around the sample inlets and are respectively provided with three micro valves; the other end of each branch of the liquid passage is respectively communicated with the six sample outlets on the lower substrate through six sample outlets on a polydimethylsiloxane film; and sample outlet tubes of the six sample outlet of the lower substrate respectively correspond to the six quartz crystal microbalances. The miniaturized total analysis device can process and detect the sample and obtain multiple groups of data at the same time.

A surface plasmon resonance biosensor device and system are provided. The simplicity of SPR biosensor design allows easy integration with both QCM and electrochemistry techniques, not found in current SPR biosensor devices. In some embodiments, the surface plasmon resonance biosensor device has a dual SPR/QCM sample holder which allows simultaneous detection by both surface plasmon resonance and also quartz crystal microbalance (QCM) techniques. In additional embodiments, the surface plasmon resonance biosensor device and/or the dual SPR/QCM technique can be integrated with electrochemistry techniques by incorporate reference and counter electrodes in the SPR or SPR/QCM sample holder. Methods of using the device and system to determine whether an analyte of interest is present in a sample are also provided.

The present invention relates to a high-pressure quartz crystal microbalance sensor that is capable of measuring adsorption and diffusion characteristics of nanoporous materials and thin films at high pressures.

The invention relates to a chip of a surface plasmon resonance instrument which is based on polyethylene glycol and a preparation method. The chip comprises a glass film base and a gold plating film on the glass film base; wherein the gold plating film is provided with an initiator layer which is introduced in the way of self-assembly and a functionalized polyethylene glycol layer which is combined with the initiator layer. The invention uses a quartz crystal microbalance to monitor the growth of the film at the surface of the chip at real time and the chip of the invention effectively solves the problem of non-specific absorption of protein. As the surface ornament of the chip is not limited to traditional carboxylic dextran, the density and types of the functional groups at the chip surface are no longer strictly restricted. Furthermore, the chip of the invention also has good performance in terms of the specificity maintenance and quality control of biological signaling molecule and so on. The preparation method of the chip of the invention has few steps and the low manufacturing cost and is more suitable for industrial production. The chip has more potential of deep development and more superior generality.

Solids deposition in a gas environment, such as a gas transmission line or pipeline are measured using metal-coated quartz crystal microbalance (QCM) in a QCM probe within a high pressure gas chamber in the gas environment. The metal coated on the QCM may be iron, iron alloys and/or iron oxide. The weight measurements are conducted at a constant (ΔT) or controlled (T=f(t)) temperature between the high pressure gas chamber and the QCM probe. The weight gain during a CE cycle is associated with the solids formation rate.

The invention discloses a method and structure for collecting tiny dust particles and provides a method and structure for collecting tiny dust particles from a spacecraft orbit environment. By adopting the method, the charge-mass ratio of tiny dust particles can be measured quantitatively under the condition of simulating the spacecraft orbit environment, and the national mass in-situ monitoring sensitivity is increased to 1.10*10<-9> to 4.42*10<-9> g/cm<2>; a dust particle charge-mass ratio testing instrument is simple in structural design and mainly comprises a circular grid plate, a hollow cylindrical capacitor and a QCM (Quartz Crystal Microbalances), so that the accuracy of measured data is greatly increased in the testing process and the load using risk of a spacecraft orbit is lowered; in the method, the hollow cylindrical capacitor is used, the design size of the instrument is reduced and a signal acquisition circuit and an assembly box are used, so that the charge-mass ratio of tiny dust particles is well measured and the testing process is stable and reliable; and due to the adoption of the QCM, the mass change of passing particles is well measured, the testing process is stable and reliable and high reproducibility is achieved. The method and the structure have the characteristic of in-situ monitoring of the charge-mass ratio of particles in the spacecraft orbit environment, and are suitable for scale test, production, research and the like.

In the present invention, we present a robust technical approach of how the use of a modified detector set-up eliminates a complication in relation to the usage of prism-based optical reflectometry in contact with liquid sample suspension. Additionally we disclose how molecular interactions at a solid-liquid interface can be investigated simultaneously using optical reflectometry. combined with other techniques that do not have technical interference with reflectometry when sharing the same solid sensing surface, for instance with a quartz crystal microbalance of some suitable type.

The invention discloses a quartz crystal micro-balance trace ammonia gas detection device, comprising a sensitive quartz crystal microbalance (QCM) sensor and a reference QCM sensor, which are respectively connected with a crystal oscillation circuit A and a crystal oscillation circuit B, wherein signal output ends of the crystal oscillation circuit A and the crystal oscillation circuit B are respectively connected with a frequency measurement circuit A and a frequency measurement circuit B, also connected with a personal computer (PC) machine with a built-in Labview data acquisition process program by a frequency differential circuit and a data acquisition card; and the sensitive QCM sensor is a quartz crystal oscillator coated with a sensitive coating on the surface. The sensitivity degree of the quartz crystal micro-balance trace ammonia gas detection device is high, the precision and range of the frequency measurement are increased by using the frequency measurement circuit way combining a single-chip microcomputer with a complex programmable logic device (CPLD); the sensitivity degree of the quartz crystal micro-balance trace ammonia gas detection device is less affected by environment; the selectivity is good; and the produced polyaniline film has single absorption of the ammonia gas and is less susceptible to other gas interference.

A surface mount type crystal oscillator includes a container main body including a recess on one main surface thereof and hermetically encapsulating an IC (integrated circuit) chip and a quartz crystal blank, and a mounting terminal electrically connected to the IC chip. The container main body includes a laminated ceramic made by laminating a flat layer and a frame wall layer, and a notch portion which is opened to the outer periphery of the container main body is formed on the flat layer within a region where the frame wall layer is laminated to the flat layer. A probe contact terminal electrically connected to the IC chip and/or the crystal blank is provided on the exposed surface of the frame wall layer by the notch portion. The mounting terminal is provided on the outer bottom face of the flat layer.

The invention discloses a functional polymer thin film, a preparation method of the thin film and an application of the thin film. The preparation method comprises the following steps: (1) modifying a photo-cross-linking agent on the surface of a substrate; (2) rotationally coating the surface formed in the step (1) with a polymer solution; (3) performing irradiation reaction on the polymer solution with ultraviolet lights and covalently grafting the polymer to the substrate to form the polymer thin film; and (4) further functionalizing the polymer or directly performing biological sensing application. According to the preparation method, a three-dimensional polymer surface can be simply, quickly and efficiently prepared; the density and thickness of the surface polymer can be precisely controlled by regulating and controlling the density of the photo-cross-linking agent, the molecule weight of the polymer and spin-coating parameters; moreover, the preparation method is strong in operability, excellent in repeatability and suitable for mass production. The surface of the prepared polymer thin film has the high requirement for the fixed amount of bio-molecules and the excellent anti-nonspecific adsorption ability, thus the detection performance of a biological sensor (for example, surface plasmon resonance imaging, fluorescence, quartz crystal microbalance and electrochemical transducer) can be improved.