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48 results about "Quartz crystal microbalance" patented technology
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A quartz crystal microbalance (QCM) (also known as quartz microbalance (QMB), sometimes also as quartz crystal nanobalance (QCN)) measures a mass variation per unit area by measuring the change in frequency of a quartz crystal resonator. The resonance is disturbed by the addition or removal of a small mass due to oxide growth/decay or film deposition at the surface of the acoustic resonator. The QCM can be used under vacuum, in gas phase ("gas sensor", first use described by King) and more recently in liquid environments. It is useful for monitoring the rate of deposition in thin film deposition systems under vacuum. In liquid, it is highly effective at determining the affinity of molecules (proteins, in particular) to surfaces functionalized with recognition sites. Larger entities such as viruses or polymers are investigated as well. QCM has also been used to investigate interactions between biomolecules. Frequency measurements are easily made to high precision (discussed below); hence, it is easy to measure mass densities down to a level of below 1 μg/cm². In addition to measuring the frequency, the dissipation factor (equivalent to the resonance bandwidth) is often measured to help analysis. The dissipation factor is the inverse quality factor of the resonance, Q⁻¹ = w/fᵣ (see below); it quantifies the damping in the system and is related to the sample's viscoelastic properties.
Quartz crystal microbalance resonant frequency detection system, control method and terminal
PendingCN120593870AWeighing apparatus using elastically-deformable membersResonant frequencyAmplitude responseHemt circuits
The invention provides a quartz crystal microbalance resonant frequency detection system, a control method and a terminal, a direct digital frequency synthesis excitation unit is adopted to generate a frequency sweep excitation signal with a preset frequency range and stepping, and the frequency sweep excitation signal is conditioned by a signal injection and conditioning unit and then injected into a QCM sensor. And then the pure amplitude response detection unit measures and quantifies voltage response amplitudes of the QCM sensor under different excitation frequencies, and the resonant frequency intelligent determination unit determines the resonant frequency of the QCM sensor according to the voltage response amplitudes. According to the invention, a QCM self-oscillation circuit does not need to be designed and debugged, a precise phase detection assembly does not need to be configured, the circuit board layout is simpler, and components are greatly reduced. The QCM resonant frequency can be accurately measured only through efficient amplitude detection, a complex algorithm is avoided, the operational capability requirement and the software development difficulty are reduced, the QCM resonant frequency measuring device has the advantages of being simple in structure, low in cost, easy to integrate and the like, miniaturization and low-power-consumption design can be easily achieved, and the QCM resonant frequency measuring device is suitable for portable and wearable application.
Owner:SHANGHAI TECH UNIV
Method for detecting quality of aminobutyric acid extract in peanut sprouts
ActiveCN120847200AMaterial capacitanceMaterial electrochemical variablesQuartz crystal microbalanceMicrofluidics
The invention relates to the technical field of quality detection, and provides a method for detecting the quality of an aminobutyric acid extract in peanut sprouts, which comprises the following steps: performing specific recognition on aminobutyric acid by a molecular imprinting sensor, and calculating the impurity contribution by combining a preset peanut sprout interference database and partial least square regression; the interference of complex matrix impurities in the peanut bud extract can be specifically eliminated, and the problem that the specificity is insufficient when a traditional method is used for detecting a complex sample is solved; the molecularly imprinted sensor and the quartz crystal microbalance are connected in series through the microfluidic channel, and resonance frequency detection is triggered by using capacitance variation, so that a coherent process is formed from identification to quality analysis of sample detection, and the detection efficiency is improved; the corrected frequency offset, the phase angle and the temperature are input into the recurrent neural network, accurate output of the concentration of the aminobutyric acid is achieved by integrating multi-dimensional detection information, compared with a single parameter detection method, the real content of the aminobutyric acid in an extract can be reflected more comprehensively, and a reliable basis is provided for quality judgment.
Owner:NANJING KANGKEJIAN BIOTECHNOLOGY CO LTD
quartz crystal microbalance (modular)
1. The name of the design product: quartz crystal microbalance (modular). 2. The use of the design product: for gas, liquid component analysis and micro-mass measurement, film thickness and viscoelastic structure detection. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: combined state 1 perspective view. 5. Other components that need to be explained: component 1 is a sensing module, component 2 is an integrated expansion module. 6. Other information that needs to be explained: combined state 1 is composed of 10 component 1 and 1 component 2, combined state 2 is composed of 8 component 1 and 1 component 2, the design is not limited to these two combined states, according to actual needs, 1 component 2 can be combined with 1-10 arbitrary number of component 1.
Owner:CHANGZHOU INST OF TECH +1
Device and method for improving the stability and detection limit of acoustic wave sensors
ActiveUS12631600B2Analysing fluids using sonic/ultrasonic/infrasonic wavesWeighing apparatus using elastically-deformable membersReference sampleQuartz crystal microbalance
A device and method for real-time measurement using acoustic wave sensors, without the measurement being altered by environmental conditions such as temperature, humidity, flow or pressure, and without requiring the use of external gauges. The proposed method and device improve the stability and detection limit of quartz crystal microbalance (QCM) sensors. The method and device are based on the high degree of correlation between acoustic resonators integrated into a single piezoelectric substrate. The use of a reference sample to correct the instability of the baseline is not required. The method and device are intended for the industrial sector of the production of measuring devices based on quartz crystals.
Owner:ADVANCED WAVE SENSORS SL
Pressure equalized quartz crystal microbalance assembly
PendingUS20260049964A1Analysing fluids using sonic/ultrasonic/infrasonic wavesQuartz crystal microbalanceLaboratory scale
A pressure-equalization holder is provided with a laboratory-scale reactor for measuring material deposition with a quartz crystal microbalance assembly. The pressure-equalization holder allows a process liquid from an interior of the laboratory-scale reactor to contact a liquid-facing crystal surface of a crystal of a quartz crystal microbalance assembly. The pressure-equalization holder also allows an inert fluid to contact an inert fluid-facing crystal surface of the crystal, where the inert fluid is at the same pressure as the process liquid.
Owner:CHAMPIONX LLC
Preparation method of K < + > identification response quartz crystal microbalance chip and blood potassium concentration quantitative detection method
The invention belongs to the technical field of biomedicine, and particularly relates to a preparation method of a potassium K < + > recognition response quartz crystal microbalance chip and a blood potassium concentration quantitative detection method. A 3-aminopropyltriethoxysilane (APTES) solution is used for carrying out functionalization treatment on the surface of a silicon dioxide sheet, so that a large number of amino functional groups are obtained on the surface of the silicon dioxide sheet. The preparation method comprises the following steps: taking 4-acrylamide benzene-15-crown-5 as a template, then anchoring an ATRP (Atom Transfer Radical Polymerization) initiator-bromoisobutyryl bromide on the surface of the template through a covalent bond, and carrying out grafting construction of a benzene-15-crown-5 functional polymer brush by adopting Cu0-mediated surface-initiated atom transfer radical polymerization (Cu0-SI-ATRP) by taking 4-acrylamide benzene-15-crown-5 as a polymeric monomer. The potassium selective quartz crystal microbalance based on the crown ether functionalized polymer brush is obtained.
Owner:SICHUAN UNIV
Two-parameter modulation and feature fusion method of electromagnetic excitation wireless QCM-D
PendingCN120992742AAnalysing fluids using sonic/ultrasonic/infrasonic wavesUltrasonic/sonic/infrasonic wave generationQuartz crystal microbalanceAcoustic wave
The invention discloses an electromagnetic excitation wireless QCM-D (Quartz Crystal Microbalance) two-parameter modulation and multi-modal feature fusion method for high-specificity recognition of volatile organic compounds, and designs a synchronous modulation method of frequency-voltage two parameters of driving voltage for a wireless electrodeless quartz crystal microbalance WE-QCM-D system. By extracting the dissipation variable quantity of sound wave energy generated by the change of driving voltage under different excitation frequencies on the surface of a quartz crystal, the steady-state response dimension of WE-QCM-D to VOCs is improved, and the fusion of steady-state and dynamic response characteristics is carried out by combining machine learning and a neural network algorithm. High-selectivity recognition of various similar VOC gases and mixed VOCs samples is achieved, and the recognition rate reaches 95% or above.
Owner:ZHEJIANG UNIV
MEMS structure delamination method and MEMS structure delamination system
PendingCN121558436APreparing sample for investigationMicrostructural devicesQuartz crystal microbalancePhysical chemistry
The invention relates to an MEMS structure delamination method and an MEMS structure delamination system, and the method comprises the steps: S1, obtaining a standard sample with a to-be-etched layer, carrying out the ion beam milling of the standard sample to remove the to-be-etched layer, recording a frequency offset [delta] f1 through employing a quartz crystal microbalance, and calculating a calibration coefficient K according to the [delta] f1; and S2, obtaining a sample to be subjected to layer removal, performing ion beam milling on the sample to be subjected to layer removal, calculating the frequency offset delta f2 of the sample to be subjected to layer removal according to the calibration coefficient K, judging a processing end point, and completing layer removal. According to the technical scheme, the mass deposition of the sputtering product in the ion beam milling process is monitored in real time through the QCM, the amount of the removed material is indirectly reflected through the frequency offset delta f1, and the machining precision is improved; a calibration coefficient K is pre-calibrated through a standard sample, and sputtering yield fluctuation in ion beam milling is compensated, so that the delamination process has good repeatability and transportability.
Owner:HUBEI JIUFENGSHAN LAB
Digital microfluidic system containing quartz crystal microbalance sensor
The utility model discloses a digital micro-fluidic system containing a quartz crystal microbalance sensor. The digital micro-fluidic system comprises an integrated system and a main body, the integrated system comprises a constant temperature system, a microfluidic system, a quartz crystal microbalance system, a control system and a data processing system, automatic control of subsystems of the instrument is realized by using an embedded system, and integrated control of the subsystems is completed by combining system programming. A main body is designed to surround a micro-fluid channel of a micro-fluidic chip and a layout of a quartz crystal sensor, the QCM sensor is connected with the micro-fluid channel of the micro-fluidic chip, it is ensured that fluid can be in contact with the sensor through the channel, fluid flowing is accurately controlled through a peristaltic pump and the micro-fluid channel, and a sample pool and a waste liquid pool are arranged; the container is used for storing samples and collecting waste liquid; mechanical support design is carried out on an instrument support structure, and internal structure protection design is carried out on each control and interface unit.
Owner:CHANGZHOU AIKERUI TECH CO LTD
A method for detecting freshness of salmon fish meat by using a QCM gas sensor array combined with a physicochemical method
ActiveCN116148344BAnalysing fluids using sonic/ultrasonic/infrasonic wavesTesting foodBiotechnologyPrincipal component analysis
Salmon meat is prone to spoilage during transportation and storage due to its rich protein and fatty acid content. During the spoilage process, the released volatile organic compounds (VOCs) can vary greatly, mainly including trimethylamine (TMA), dimethylamine (DMA), formaldehyde (HCHO), and ammonia (NH3). In this study, an array of quartz crystal microbalance (QCM) gas sensors was established, which was modified with graphene oxide (GO), Mxenes (Ti3C2T X ), hydroxylated multi-walled carbon nanotubes (MWCNTs), and graphdiyne oxide (GO P ), respectively, to detect TMA, DMA, HCHO, and NH3 in salmon meat, respectively. The results showed that the four kinds of sensor materials modified QCM sensors had good sensitivity, selectivity and repeatability for the corresponding target gas. Finally, the freshness of salmon meat was detected using the sensor array. The sensor response data was visualized by principal component analysis (PCA), and the first two principal components (PCs) explained 98.8% of the total contribution variance. A further discriminant model was established using quadratic support vector machine (QSVM), and the classification result was 100%. To further describe, the detection results were compared with the total volatile base nitrogen (TVB-N) content to judge the freshness of salmon meat.
Owner:SHANDONG UNIV OF TECH
Emulsified oil adsorption membrane pollution testing method and device
The invention relates to the technical field of membrane cleaning, and provides a membrane pollution test method for emulsified oil adsorption and a device thereof in order to solve the problem that a test method for simulating adsorption pollution conditions of emulsified oil drops with different particle sizes on the surface of a membrane lacks in the prior art, and the test method comprises the following steps: assembling a membrane to be tested on the surface of a clean gold electrode, and then putting the membrane into a sample pool; adding the artificial emulsion into a sample pool, and detecting the surface condition of a gold electrode through a quartz crystal microbalance to analyze the membrane pollution condition; a cleaning agent to be detected is added into the sample pool, and the surface condition of the gold electrode is detected through the quartz crystal microbalance to analyze the cleaning effect. The particle size of emulsified oil drops in the artificial emulsion can be regulated and controlled, so that the artificial emulsion can be used for simulating different oily wastewater, the change conditions of adhesion, aggregation and the like of oil molecules on the surface of the membrane can be observed, and the adsorption behavior and the cleaned effect of the oil drops on the filter membrane under different particle sizes can be analyzed; the development of a filter membrane with strong anti-pollution capacity and a cleaning agent with a good cleaning effect is facilitated.
Owner:ZHEJIANG UNIV OF WATER RESOURCES & ELECTRIC POWER
Equipment and method for monitoring air environment pollution of factory harmed by occupational diseases
The invention discloses equipment and a method for monitoring air environment pollution of factories damaged by occupational diseases, belongs to the technical field of air environment monitoring, and solves the problems that the toxicity of composite pollutants formed by quenching oil mist and metal dust in heat treatment and fine grinding workshops of bearing manufacturers is multiplied, sampling distortion is caused by oil mist interference detection and workshop pollutant retention areas, and the detection accuracy is low. And finally, the detection report reaches the standard falsely. Comprising a sensor array module and a data processing module, and the sensor array module comprises a quartz crystal microbalance array module, a multi-wavelength optical sensor array module, a broadband impedance sensor array module and a surface acoustic wave sensor array module. According to the invention, through synchronous acquisition of multi-modal sensor data, real-time analysis and processing, quantification of pollutant carrier effect, fusion of multi-source information, accurate identification of pollutant components, assessment of health risk level and automatic generation of early warning signals, comprehensive and accurate monitoring and risk early warning of composite pollutants in a factory environment are realized.
Owner:ZHEJIANG XINGDA SAFETY TECH CO LTD
Method for measuring service life of boron film on first wall of Tokamak device
PendingCN121632836ANuclear energy generationMaterial weighingQuartz crystal microbalancePhysical chemistry
The invention discloses a method for measuring the service life of a first wall boron film of a Tokamak device, and belongs to the technical field of high-temperature plasma diagnos.The method comprises the steps that in the operation stage of a Tokamak plasma experiment, the mass change of a material is monitored in real time through a quartz crystal microbalance system located in a magnetic shadow area; based on monitoring data of the quartz crystal microbalance system, an evolution curve of accumulated mass change along with accumulated discharge time is drawn; performing local fitting and slope inspection on the slope of the evolution curve of the cumulative mass change along with the cumulative discharge time, and when the local fitting slope is remarkably changed, extracting plasma parameters under corresponding discharge conditions and confirming that the plasma parameters are in a stable state; and judging the end-of-life point of the first wall boron film based on the slope characteristic of the evolution curve of the cumulative mass change along with the cumulative discharge time. According to the invention, in-situ, real-time and accurate life measurement can be realized in the plasma discharge process.
Owner:HEFEI INSTITUTE OF PHYSICAL SCIENCE CHINESE ACADEMY OF SCIENCES
Atmospheric corrosion monitoring device based on quartz crystal microbalance
ActiveCN223637343UWeather/light/corrosion resistanceMaterial weighingElectrical batteryHemt circuits
The utility model relates to an atmospheric corrosion monitoring device based on a quartz crystal microbalance, which is characterized in that a measuring circuit is connected with an MCU (Microprogrammed Control Unit), collects an oscillation signal generated by a quartz crystal wafer sensor, identifies the frequency of the oscillation signal, and transmits the frequency of the oscillation signal to the MCU; and the MCU is used for calculating the oxidation weight gain rate and the corrosion rate of the metal film. The battery is connected with and supplies power to the measuring circuit; the charging circuit is connected with the battery and provided with a charging interface. The atmospheric corrosion monitoring device based on the quartz crystal microbalance can reach nanogram resolution, so that the mass gain of metal surface corrosion products in the atmospheric environment can be monitored on line in situ, and the sensitivity of monitoring the overall corrosion can meet the requirements that the magnitude order of 10-9g is difficult to realize by other types of sensors and the corrosion resolution is less than or equal to 10nm; and the monitoring precision of metal corrosion is greatly improved.
Owner:WUHAN CORRTEST INSTR
Molecular sensor for detecting methane and / or carbon dioxide dissolved in a liquid
PCT designated stageWO2025190891A1Analysing fluids using sonic/ultrasonic/infrasonic wavesQuartz crystal resonatorMetal-organic framework
Disclosed is a molecular sensor for detecting molecules dissolved in liquid, the molecular sensor comprising: a sensor housing, a measurement chamber comprised in the sensor housing and being fluidly coupled to an exterior of the sensor housing, and a quartz crystal microbalance (QCM). A quartz crystal resonator comprised in the QCM is functionalised with a metal-organic framework (MOF) which can reversibly adsorb methane and / or reversibly adsorb carbon dioxide, and the molecular sensor is configured such that liquid which enters the measurement chamber can come in direct contact with a surface of the MOF. Also disclosed is a method of detecting and / or quantifying molecules dissolved in a liquid, the method comprising the steps of: providing a molecular sensor comprising a quartz crystal microbalance (QCM), the QCM comprising a quartz crystal resonator, the QCM being functionalised with a metal-organic framework (MOF) which can reversibly adsorb methane and / or reversibly adsorb carbon dioxide; providing the liquid to a functionalised surface of the QCM such that the liquid directly contacts the functionalised surface.
Owner:DANMARKS TEKNISKE UNIV
Method for analyzing DOM deposition behavior
The invention relates to a method for analyzing DOM deposition behaviors, and belongs to the technical field of pollutant environment behavior analysis. According to the method, a dissipative quartz crystal microbalance (QCM-D) is used for analyzing the deposition behavior of a dissolved organic matter (DOM) solution on an inorganic interface, in-situ monitoring can be carried out in the whole process, structural disturbance caused by sample pretreatment (such as freeze-drying and drying) in a traditional method is avoided, and the deposition behavior of DOM in a water phase is truly reflected; difference comparison can also be carried out on interface behaviors under the coexistence condition of DOM with various molecular weights, whether an enhancement, inhibition or neutral deposition effect exists or not is recognized, and a component cooperation mechanism is analyzed; the QCM-D can record frequency and dissipation changes at the same time, can distinguish deposition quality and structural viscoelasticity, reveals the dynamic process of deposition layer formation, and is high in time resolution and structural sensitivity; the method is suitable for various DOM sources and different inorganic interfaces, and is high in adaptability and wide in generalizability.
Owner:SUN YAT SEN UNIV
A carbonate rock coating modified quartz crystal microbalance sensor and a preparation method and application thereof
ActiveCN115524396Beasy to coverQuantitative coating controllableAnalysing fluids using sonic/ultrasonic/infrasonic wavesMaterial electrochemical variablesQuartz crystal microbalancePhysical chemistry
The application relates to the technical field of sensor monitoring, and discloses a carbonate rock coating modified quartz crystal microbalance sensor and a preparation method and application thereof, which comprises the following steps: S1, preparing a carbonate rock mixed deposition solution; S2, taking supernatant after centrifugal treatment of the carbonate rock mixed deposition solution; S3, continuously introducing the supernatant into an electrochemical flow cell provided with a sensor chip; the time for continuously introducing the supernatant is greater than or equal to 20 minutes; and S4, then taking the sensor chip after power-on treatment and stabilization treatment to carry out drying treatment. The carbonate rock coating modified quartz crystal microbalance sensor provided by the application has controllable coating roughness and thickness, and has high sensitivity and responsiveness.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
A method for quality detection of GABA extract in peanut sprouts
ActiveCN120847200BMaterial capacitanceMaterial electrochemical variablesQuartz crystal microbalanceMicrofluidics
This application relates to the field of quality testing technology and provides a method for quality testing of GABA extract in peanut sprouts. It utilizes a molecularly imprinted sensor for specific identification of GABA, combined with a pre-set peanut sprout interference database and partial least squares regression to calculate impurity contribution. This method can specifically eliminate interference from complex matrix impurities in peanut sprout extracts, solving the problem of insufficient specificity in traditional methods for complex samples. The molecularly imprinted sensor is connected in series with a quartz crystal microbalance via a microfluidic channel. Capacitance changes trigger resonant frequency detection, creating a coherent process from identification to quality analysis and improving detection efficiency. By inputting corrected frequency offset, phase angle, and temperature into a recurrent neural network, the method integrates multi-dimensional detection information to achieve accurate output of GABA concentration. Compared to single-parameter detection methods, this method more comprehensively reflects the true content of GABA in the extract, providing a reliable basis for quality judgment.
Owner:NANJING KANGKEJIAN BIOTECHNOLOGY CO LTD
A traceability method for sensing mass value of quartz crystal microbalance using hard film method and mass comparison method
ActiveCN116222732BWeighing apparatus using elastically-deformable membersWeighing apparatus testing/calibrationMass incrementQuartz crystal microbalance
The traceability method of the quartz crystal microbalance (QCM) sensing mass value of the application by using the hard film method and the mass comparison method makes that as long as the metrological technology institutions and laboratories of high-precision mass comparators and high-accuracy weights can adopt the method of the application, the traceability of the QCM sensing mass value is realized; the traceability method of the QCM sensing mass value is simplified, and wider popularization is obtained; and the traceability of the QCM in the mass increment range below 16 mu g is innovatively solved, the range of the traceability method for the traceability of the small mass is expanded, the measurement range is expanded to 2 mu g to 1000 mu g; the expanded range of the traceability of the small mass can improve the mass sensitivity, and further improve the detection precision of the QCM, and further bring great changes and influences.
Owner:NATIONAL INSTITUTE OF METROLOGY CHINA
Device and method for online calibration of mass of quartz crystal microbalance at low temperature
PendingCN121720561AWeighing apparatus testing/calibrationQuartz crystal microbalancePhysical chemistry
The invention provides an online calibration device for a quartz crystal microbalance probe at a low temperature. The online calibration device comprises a pollutant generator, a quartz crystal microbalance probe mounting seat and a micro weighing module, the quartz crystal microbalance probe mounting seat is used for mounting a quartz crystal microbalance probe; the pollutant generator is heated to release internal pollutants, and the internal pollutants can be uniformly adsorbed to the surface of a quartz crystal oscillator of the quartz crystal microbalance probe; the trace weighing module monitors the mass change of the pollutant generator online in real time; the online calibration device can be placed on a guide rail in the vacuum low-temperature container and is not in contact with other parts in the container except the guide rail. According to the invention, on-line weighing of the calibration pollutants in the vacuum low-temperature environment is realized, the mass change of the calibration pollutants in the process that the balance probe adsorbs the pollutants in the low-temperature environment is accurately monitored, and the desorption mass loss error and the pollutant loss error in the heating and cooling process are reduced.
Owner:SHANGHAI YUDA INDUSTRIAL CO LTD
Mine gas detection device based on electronic information
ActiveCN223992615UAnalysing fluids using sonic/ultrasonic/infrasonic wavesMeasurement apparatus componentsSurface acoustic waveElectronic information
The utility model relates to the technical field of gas detection equipment, in particular to a mine gas detection device based on electronic information, which comprises a universal bamboo joint pipe and a detection mechanism, a limiting plate is arranged at one end of the universal bamboo joint pipe, the detection mechanism is connected to one end of the universal bamboo joint pipe through a heat dissipation mechanism, and a cover body is connected to one side of a bottom plate in a buckling manner. A cover plate is arranged on one side of the bottom plate, a sensor detection module is arranged on one side of the bottom plate, and the sensor detection module comprises a metal oxide semiconductor, a quartz crystal microbalance, a surface acoustic wave and quantum dot spectrometer and an environment sensor assembly. Three types of sensor chips of a metal oxide semiconductor, a quartz crystal microbalance and a surface acoustic wave are integrated to form a 16-channel bionic olfaction array, the sensitivity is improved through multi-modal data fusion, meanwhile, detection including but not limited to methane and carbon monoxide gas is achieved, the humidity resistance and dust interference resistance are extremely high, meanwhile, a detection mechanism is cooled, and the detection efficiency is improved. And the detection mechanism can work conveniently.
Owner:SHANDONG GOLD MINING LINGLONG
Sulfonic acid covalent organic framework material, preparation method thereof and humidity sensor
ActiveCN119775517BAnalysing fluids using sonic/ultrasonic/infrasonic wavesOctanoic AcidsQuartz crystal microbalance
The present invention belongs to the field of gas humidity sensing and relates to a sulfonic acid covalent organic framework material, a preparation method thereof and a humidity sensor. The preparation method of the sulfonic acid covalent organic framework material provided by the present invention comprises the following steps: S1: dissolving 2,4,6-trihydroxy-1,3,5-benzenetricarboxaldehyde in octanoic acid to prepare solution A; S2: dissolving 2,5-diaminobenzenesulfonic acid in water to prepare solution B; S3: adding solution B dropwise to the upper layer of solution A and allowing to react; S4: after the reaction is completed, removing the upper clear liquid, dialyzing the lower red aqueous solution, and obtaining a sulfonic acid covalent organic framework material. The sulfonic acid covalent organic framework material provided by the present invention has the potential to become a humidity-sensitive material. The humidity sensor provided by the present invention is based on COF material and quartz crystal microbalance, has the advantages of good hydrophilicity, high sensitivity, fast response recovery, and good dynamic response, and has broad application prospects.
Owner:NINGBO INST OF METROLOGY & MEASUREMENT NINGBO WEIGHING APP ADMINISTATION OFFICE +1
Gas sensor element, gas sensor, and method for measuring hydrogen gas or carbon monoxide gas concentration using the same
To provide a gas sensor element capable of detecting flammable gases such as hydrogen gas and carbon monoxide gas, without requiring the use of precious metals or high-temperature conditions, and a hydrogen gas or carbon monoxide gas sensor using the same. [Solution] The gas sensor element is characterized by comprising a diamond-like carbon film, and detecting the presence of the target gas based on the mass change of the film caused by the action of the target gas on the diamond-like carbon film. In a gas sensor element 1 that applies this principle to a quartz crystal microbalance (QCM) sensor, a diamond-like carbon film 13 is formed directly or via an intermediate layer on at least one surface of the counter electrodes 12A sandwiching the quartz substrate 11. A gas sensor using this element exhibits high specificity for hydrogen gas and carbon monoxide gas.
Owner:TOKYO DENKI UNIVERSITY
System and method for mass flow measurement and control of process gases in a carrier stream using one or more quartz crystal microbalance sensors
ActiveUS12577675B2Analysing fluids using sonic/ultrasonic/infrasonic wavesProcessing detected response signalQuartz crystal microbalancePhysical chemistry
A method for monitoring precursor material in a carrier stream of a fabrication system comprises depositing a film of precursor material on a surface of a QCM sensor and determining a starting resonance frequency of the QCM sensor with the deposited film of precursor material. The resonance frequency of the QCM sensor is measured during operation of the fabrication system and compared with the starting resonance frequency. A system error is issued when the measured resonance frequency differs from the corresponding starting resonance frequency by more than a threshold value. A system correction is automatically implemented and configured to restore the QCM sensor to the starting resonance frequency.
Owner:INFICON INC
Mof / mip / qcm sensor for in-situ detection of quinolone antibiotics, preparation method and application
The application discloses a MOF / MIP / QCM sensor for in-situ detection of quinolone antibiotics, a preparation method and application, and belongs to the technical field of environmental antibiotic detection. The preparation method is as follows: 1) quinolone antibiotic template molecules and functional monomers are added to an organic solvent, and after being dissolved, MOF materials, a crosslinking agent and an initiator are sequentially added to obtain a prepolymerization solution; 2) the prepolymerization solution is subjected to a polymerization reaction under the protection of an inert gas, and after the template molecules are removed by washing, the MOF-based molecularly imprinted polymer is dried to obtain the MOF / MIP / QCM sensor. The sensor is connected with a quartz crystal microbalance detection device, and then placed in a water body to be detected; the specific adsorption of the sensor to quinolone antibiotics causes the characteristic of a decrease in the resonance frequency of the quartz crystal, and the in-situ rapid quantitative detection of quinolone antibiotics is realized by measuring the frequency change.
Owner:ZHEJIANG UNIV OF TECH
Quartz crystal microbalance (QCM)-based humidity sensor
The invention discloses a humidity sensor based on a quartz crystal microbalance (QCM). The humidity sensor comprises an MCU, a humidity sensitive unit and a humidity measuring unit, the humidity-sensitive unit is based on the QCM principle and comprises a piezoelectric wafer, a metal electrode and a humidity-sensitive film. The oscillation frequency of the QCM is sensitive and depends on the environment humidity, so that a humidity-sensitive QCM is formed; the humidity sensitive QCM is connected to the humidity measuring unit to form an oscillator, and the humidity measuring unit detects the oscillation frequency of the QCM and transmits the measured frequency value to the MCU. Through deep fusion of a dual-unit redundancy design, an ingenious mechanical structure and an intelligent software algorithm, transition from a'measuring element needing professional calibration 'to a'user-friendly and plug-and-play intelligent terminal' is successfully realized. The method has great potential in the aspects of improving the measurement precision and long-term stability, greatly simplifying the operation and maintenance process, reducing the whole life cycle cost and the like.
Owner:NANTONG UNIV
A QCM gas sensitive element based on electrostatic spinning Ce-MOF nanofiber and a preparation method thereof
This invention discloses a QCM gas-sensitive element based on electrospun Ce-MOF nanofibers and its preparation method, belonging to the field of gas sensing materials technology. The gas-sensitive element includes a quartz crystal microbalance substrate and a sensitive coating disposed thereon, wherein the sensitive coating is Ce-UiO-66 nanofibers; the Ce-UiO-66 nanofibers are prepared by electrospinning, with a diameter of 300-500 nm, and the cerium element is represented by Ce. 3+ / Ce 4+ It exists in a mixed valence state. This invention combines the high specific surface area adsorption characteristics of MOF with the rapid mass transfer advantages of porous fibers. The QCM gas-sensitive element has high sensitivity and rapid response characteristics to borneol volatile gases. Moreover, the QCM gas-sensitive element provided by this invention has a simple preparation process, low cost, and can operate at room temperature.
Owner:JILIN UNIVERSITY
Method for quantifying interaction force between ionic liquid and metal by combining colloid probe atomic force microscope with quartz crystal microbalance
PendingCN121324202ASurface/boundary effectScanning probe microscopyChemical physicsQuartz crystal microbalance
The invention discloses a method for quantifying interaction force between ionic liquid and metal by combining a colloid probe atomic force microscope with a quartz crystal microbalance. The method comprises the following steps: firstly, measuring a force-distance curve by utilizing CP-AFM to obtain the interaction force between a metal electrode in unit area and the ionic liquid, and then measuring the equilibrium adsorption number of the ionic liquid adsorbed on the metal surface in unit area through QCM. Finally, the interaction force between the ionic liquid and metal material molecules is quantified according to the ratio of the interaction force between the unit-area metal electrode and the ionic liquid to the equilibrium adsorption number of the ionic liquid adsorbed on the unit-area metal surface. According to the method, the CP-AFM and the QCM are combined, the interaction force between the metal surface and the ionic liquid is accurately quantified, key data are provided for establishing a reliable ionic liquid database, and the design of an ionic liquid lubricant is assisted.
Owner:NANJING UNIV OF SCI & TECH
QCM with electrode configuration based on distribution of area for improving mass sensitivity (DAIS)
ActiveUS12560577B2Analysing fluids using sonic/ultrasonic/infrasonic wavesQuartz crystal microbalanceAnalytical chemistry
In a preferred embodiment, there is provided a quartz crystal microbalance comprising a pair of electrodes and a quartz crystal disposed therebetween, one said electrode operable as a sensing electrode for interacting with an analyte, wherein said sensing electrode comprises an array of sensing electrode members positioned within a sensing electrode surface portion on the quartz crystal.
Owner:UNIVERSITY OF WINDSOR
Ultra-sensitive quartz crystal microbalance QCM immune sensing array based on DMSN-coated AuNPs
The invention discloses an ultra-sensitive quartz crystal microbalance (QCM) immune sensing array based on DMSN (at) AuNPs. The surface of each channel of the immunosensor array is coated with a capture antibody and is subjected to non-specific sealing treatment, the immunosensor array is used for specifically recognizing and capturing a target antigen, signal amplification is realized by introducing a DMSN (at) AuNPs (at) detection antibody composite probe, and real-time quantitative detection of a target object is realized according to frequency variation. DMSN has the advantages of rich pore channels, large specific surface area, adjustable structure, easiness in functionalization and the like, and can efficiently load a large amount of AuNPs, so that the signal amplification effect is remarkably enhanced. The multichannel QCM immune sensing array has the advantages of compact structure, convenience in assembly, no interference among channels, stable and reliable detection result and the like, the sensor array and the nano composite probe can be prepared in batches and stored for a long time, and the multichannel QCM immune sensing array has a wide application prospect in the fields of disease early screening, biological safety detection, environmental monitoring and the like.
Owner:ZHEJIANG UNIV