Bibliografias temáticas / QCM

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Literatura científica selecionada sobre o tema "QCM"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 7 de setembro de 2023

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Artigos de revistas sobre o assunto "QCM"

Tahir, Iqmal, Mudasir Mudasir, Irza Yulistia e Mustofa Mustofa. "QUANTITATIVE STRUCTURE-ACTIVITY RELATIONSHIP ANALYSIS (QSAR) OF VINCADIFFORMINE ANALOGUES AS THE ANTIPLASMODIAL COMPOUNDS OF THE CHLOROQUINOSENSIBLE STRAIN". Indonesian Journal of Chemistry 5, n.º 3 (15 de junho de 2010): 255–60. http://dx.doi.org/10.22146/ijc.21800.

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Quantitative Structure-Activity Relationship (QSAR) analysis of vincadifformine analogs as an antimalarial drug has been conducted using atomic net charges (q), moment dipole (), LUMO (Lowest Unoccupied Molecular Orbital) and HOMO (Highest Occupied Molecular Orbital) energies, molecular mass (m) as well as surface area (A) as the predictors to their activity. Data of predictors are obtained from computational chemistry method using semi-empirical molecular orbital AM1 calculation. Antimalarial activities were taken as the activity of the drugs against chloroquine-sensitive Plasmodium falciparum (Nigerian Cell) strain and were presented as the value of ln(1/IC50) where IC50 is an effective concentration inhibiting 50% of the parasite growth. The best QSAR model has been determined by multiple linier regression analysis giving QSAR equation: Log (1/IC50) = 9.602.qC1 -17.012.qC2 +6.084.qC3 -19.758.qC5 -6.517.qC6 +2.746.qC7 -6.795.qN +6.59.qC8 -0.190. -0.974.ELUMO +0.515.EHOMO -0.274. +0.029.A -1.673 (n = 16; r = 0.995; SD = 0.099; F = 2.682) Keywords: QSAR analysis, antimalaria, vincadifformine.

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Chen, Qiao, Xianhe Huang, Yao Yao e Kunlei Mao. "Analysis of the Effect of Electrode Materials on the Sensitivity of Quartz Crystal Microbalance". Nanomaterials 12, n.º 6 (16 de março de 2022): 975. http://dx.doi.org/10.3390/nano12060975.

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This paper investigated the effect of electrode materials on the performance of quartz crystal microbalance (QCM) sensors by means of theoretical calculation, experiment, and finite element analysis methods. First, we calculated the particle displacement amplitude and thus obtained the mass sensitivity function distribution of QCMs with gold, silver and aluminum electrodes, and found that the QCM with the gold electrode has the highest mass sensitivity at the center of the electrode. Then, we tested the humidity-sensing performance of QCMs with gold, silver, and aluminum electrodes using graphene oxide (GO) as the sensitive material, and found that the QCM with the gold electrode has higher humidity sensitivity. Finally, we used the finite element analysis software COMSOL Multiphysics to simulate the specific electrode material parameters that affect the sensitivity of the QCMs. The simulation results show that the density and Young’s modulus of the electrode material parameters mainly affect the sensitivity. The results of this paper are instructive for optimizing QCM sensor performance and improving the capability of QCM quantitative analysis.

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Huang, Xianhe, Qiao Chen, Wei Pan, Jianguo Hu e Yao Yao. "Assessing the Mass Sensitivity for Different Electrode Materials Commonly Used in Quartz Crystal Microbalances (QCMs)". Sensors 19, n.º 18 (14 de setembro de 2019): 3968. http://dx.doi.org/10.3390/s19183968.

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Mass sensitivity is vital for quartz crystal microbalance (QCM)-based data analysis. The mass sensitivity distribution of QCMs may differ greatly depending on the shapes, thicknesses, sizes, and materials of the metal electrodes. This is not considered by the Sauerbrey equation, and has a large potential to cause errors in QCM-based data analysis. Many previous works have studied the effects of shape, thickness, and size of metal electrodes on mass sensitivity. However, it is necessary to continue to clarify the relationship between the mass sensitivity and the electrode material of the QCM. In this paper, the results of both theoretical calculation and experimental analysis showed that the mass sensitivity of QCMs with gold electrodes is higher than that of the QCMs with silver electrodes, which in turn indicated that the mass sensitivity of QCMs varies with the electrode material. Meanwhile, the results of this study showed that the mass sensitivity of QCMs with different electrode materials is not proportional to the density of the electrode materials. This result suggests that, in order to obtain more accurate results in the practical applications of QCMs, the influence of electrode material on the mass sensitivity of the QCMs must be considered.

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Nowocień, Sylwester, Radosław Sławomir Wielgus e Janusz Mroczka. "Precision Temperature Control System with Low EMI for Applications in Analyzing Thermal Properties of Highly Sensitive Piezoelectric Sensors". Sensors 22, n.º 21 (5 de novembro de 2022): 8525. http://dx.doi.org/10.3390/s22218525.

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A low electromagnetic interference (EMI), precision temperature control system for sensitive piezoelectric sensors stabilization and their thermal characteristics research was proposed. Quartz crystal microbalance (QCM) was chosen as the device to be tested. Recently, QCMs found use in many fields of study such as biology, chemistry, and aerospace. They often operate in harsh environments and are exposed to many external factors including temperature fluctuations, to which QCMs are highly susceptible. Such disturbances can cause undesirable resonant frequency shifts resulting in measurement errors that are difficult to eliminate. The proposed solution enables measurements of QCMs thermal characteristics, effectiveness evaluation of temperature compensation methods, and testing of the frequency stability. As a part of the developed solution, two independent temperature regulators were used: first to maintain the QCM crystal at desired temperature, and second to keep the QCM oscillator circuit at fixed temperature. The single regulator consists of a thermoelectric module (TEC) used for both heating and cooling. Two considered TEC driving methods were compared in terms of EMI and their impact on the QCM signal quality. The proposed system was examined for its temperature stabilization capability showing high stability of 11 mKp-p for one hour and the setpoint accuracy of ±15 mK in the full temperature range.

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Na Songkhla, Sawit, e Takamichi Nakamoto. "Interpretation of Quartz Crystal Microbalance Behavior with Viscous Film Using a Mason Equivalent Circuit". Chemosensors 9, n.º 1 (2 de janeiro de 2021): 9. http://dx.doi.org/10.3390/chemosensors9010009.

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In odor sensing based on Quartz Crystal Microbalances (QCMs), the sensing film is crucial for both sensor sensitivity and selectivity. The typical response of the QCM due to sorption is a negative frequency shift. However, in some cases, the sorption causes a positive frequency shift, and then, Sauerbrey’s equation and Kanazawa’s equation cannot be applied to this situation. We model the QCM response with a Mason equivalent circuit. The model approximates a single layer of a uniform viscous coating on the QCM. The simulation of the equation circuit shows the possibility of the positive frequency change when the sorption occurs, which is the situation we find in some of the odor sensing applications. We measured the QCM frequency and resistance using the Vector Network Analyzer (VNWA). The QCMs were coated with glycerol, PEG2000, and PEG20M. To simulate odor exposure, a microdispenser was used to deposit the water. A positive frequency shift was observed in the case of PEG2000, and a negative frequency change was obtained for PEG20M. These results can be explained by the Mason equivalent circuit, with the assumption that when the film is exposed to water, its thickness increases and its viscosity decreases.

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Ortiz Monsalve, Camilo, Jorge Mario Guerra González e Marisol Jaramillo Grajales. "Immobilization of DNA probes on a high frequency piezoelectric biosensor". DYNA 87, n.º 212 (1 de janeiro de 2020): 163–68. http://dx.doi.org/10.15446/dyna.v87n212.82309.

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In recent years, researchers have taken to biosensors as effective tools for detection due to their portability, low-cost, fast response, and practicality. Piezoelectricity gave way to quartz crystal microbalances (QCM), of which high-frequency QCMs (HFF-QCM 100MHz) are still being researched. In this paper, we use DNA immobilization on a HFF-QCM via self-assembled monolayers (SAM) technique. Immobilization was initially verified with ATR-FTIR. Then, DNA was immobilized in real time on the HFF-QCM crystals. A variation in the phase of the signal suggests fixation of DNA to the surface, in accordance with ATR-FTIR results. A density of 629 ng/cm2 was computed. Also, a positive correlation between immobilized DNA and DNA concentration, and the appearance of a saturation point between 1 and 5 μM were shown after analysis of different DNA concentrations.

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Burda, Ioan. "Quartz Crystal Microbalance with Impedance Analysis Based on Virtual Instruments: Experimental Study". Sensors 22, n.º 4 (15 de fevereiro de 2022): 1506. http://dx.doi.org/10.3390/s22041506.

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The impedance quartz crystal microbalance (QCMI) is a versatile and simple method for making accurate measurements of the QCM sensor electrical parameters. The QCM sensor provides access to the physical parameters of the sample beyond the mass per unit area by measuring the dissipation factor, or another equivalent, ensuring a detailed analysis of the surface. By establishing a cooperative relationship between custom software and modular configurable hardware we obtain a user-defined measurement system that is called a virtual instrument. This paper aims primarily to improve and adapt existing concepts to new electronics technologies to obtain a fast and accurate virtual impedance analyzer (VIA). The second is the implementation of a VIA by software to cover a wide range of measurements for the impedance of the QCM sensor, followed by the calculation of the value of lumped electrical elements in real time. A method for software compensation of the parallel and stray capacitance is also described. The development of a compact VIA with a decent measurement rate (192 frequency points per second) aims, in the next development steps, to create an accurate impedance analyzer for QCM sensors. The experimental results show the good working capacity of QCMI based on VIA.

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Tamaki, Ichiro, e Yae Yamada. "Environmental pressure rather than ongoing hybridization is responsible for an altitudinal cline in the morphologies of two oaks". Journal of Plant Ecology 13, n.º 4 (26 de maio de 2020): 413–22. http://dx.doi.org/10.1093/jpe/rtaa028.

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Abstract Aims In a contact zone between related taxa, phenotypic variation can result from genetic and/or environmental gradients. This study aimed to clarify the cause of phenotypic variation in leaf morphology of two Quercus crispula varieties—crispula (QCC) and mongolicoides (QCM)—in their contact zone along an altitudinal gradient. Methods We measured 6 morphological traits of leaves and recorded genotypes of 13 nuclear microsatellite loci for 48 individuals in the contact zone and 24 individuals in each of the reference populations of QCC and QCM. We constructed a model explaining the phenotypic variation (leaf morphology) in relation to environmental (altitude) and genetic (ancestry from the reference population) gradients. Important Findings Both morphological and genetic markers distinguished the two varieties in the reference populations well. We were able to confirm the power of both morphological and genetic markers. Individuals within the contact zone population had intermediate ancestry that was slightly biased to QCM ancestry, and the distribution of their morphologies overlapped with those of the two varieties in the reference populations. The effect of altitude on leaf morphological traits was significant, while that of ancestry was not. Distributions of ancestry and interclass heterozygosity in the contact zone population resembled those in F2 or later generation hybrids. These results indicate that in the contact zone between QCC and QCM, there is no ongoing hybridization, but environmental pressure has created an altitudinal gradient in morphological traits through phenotypic plasticity and/or variation in functional genes.

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Cho, Hyokjin, Guee-Won Moon, Hee-Jun Seo, Sang-Hoon Lee e Seok-Weon Choi. "Measurement of Molecular Contamination for Satellites Using a Quartz Crystal Microbalance (QCM)". Journal of the IEST 47, n.º 1 (14 de setembro de 2004): 107–10. http://dx.doi.org/10.17764/jiet.47.1.pr658527u268l7q1.

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Quartz Crystal Microbalances (QCMs) have been used to measure the molecular contamination for satellites in vacuum bake-out tests at the Korea Aerospace Research Institute (KARI). Through measurement using QCMs, the mass and the mass deposition rate of molecular contamination could be traced in real-time. Vacuum bake-out tests were performed for the satellite KAISTAT-4 Flight Model and its components under various temperature conditions. During these tests, QCM measurement data was obtained and materials from the cold plate were analyzed using a Gas Chromatograph-Mass Spectrometer (GC-MS). The characteristics of the QCM sensor were also observed.

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Addabbo, Tommaso, Ada Fort, Elia Landi, Riccardo Moretti, Marco Mugnaini e Valerio Vignoli. "Strategies for the Accurate Measurement of the Resonance Frequency in QCM-D Systems via Low-Cost Digital Techniques". Sensors 22, n.º 15 (31 de julho de 2022): 5728. http://dx.doi.org/10.3390/s22155728.

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In this paper, an FPGA (Field Programmable Gate Array)-based digital architecture for the measurement of quartz crystal microbalance (QCM) oscillating frequency of transient responses, i.e., in QCM-D (QCM and Dissipation) applications, is presented. The measurement system is conceived for operations in liquid, with short QCM transient responses due to the large mechanical load. The proposed solution allows for avoiding the complex processing systems typically required by the QCM-D techniques and grants frequency resolutions better than 1 ppm. The core of the architecture is a reciprocal digital frequency meter, combined with the preprocessing of the QCM signal through mixing operations, such as a step-down of the input frequency and reducing the measurement error. The measurement error is further reduced through averaging. Different strategies are proposed to implement the proposed measurement solution, comprising an all-digital circuit and mixed analog/digital ones. The performance of the proposed architectures is theoretically derived, compared, and analyzed by means of experimental data obtained considering 10 MHz QCMs and 200 μs long transient responses. A frequency resolution of about 240 ppb, which corresponds to a Sauerbrey mass resolution of 8 ng/cm2, is obtained for the all-digital solution, whereas for the mixed solution the resolution halves to 120 ppb, with a measurement time of about one second over 100 repetitions.

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Mais fontes

Teses / dissertações sobre o assunto "QCM"

Nilebäck, Erik. "A novel biotinylated surface designed for QCM-D applications". Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-19250.

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Control of protein immobilization at sensor surfaces is of great interest within various scientific fields, since it enables studies of specific biomolecular interactions. To achieve this, one must be able to immobilize proteins with retained native structure, while minimizing non-specific protein binding. The high affinity interaction between streptavidin (SA) and biotin is extensively used as a linker between a surface, where SA is immobilized, and the (biotinylated) molecule of interest. Self- assembled monolayers (SAMs) of poly- and oligo ethylene glycol (PEG and OEG) derivatives have been proven in literature to minimize non-specific protein binding, and biotin-exposing SAMs have been shown efficient for immobilization of SA.

The aim of this master's thesis project was to develop biotinylated gold surfaces for quartz crystal microbalance with dissipation monitoring (QCM-D) applications through the self-assembly of mixed monolayers of thiolated OEG (or PEG) derivatives with or without a terminal biotin head group. For this, different thiol compounds were to be compared and evaluated. For the systems under study, the required biotin density for maximum specific SA immobilization was to be established, while keeping the non-specific serum adsorption at a minimum. Model experiments with biotinylated proteins immobilized to the SA-functionalized surfaces were to be performed to evaluate the possibilities for commercialization.

A protocol for the preparation of a novel biotinylated surface was developed based on the immersion of gold substrates in an ethanolic incubation solution of dithiols with OEG chains (SS-OEG and SS-OEG-biotin, 99:1) and found to give reproducible results with respect to low non-specific protein binding and immobilization of a monolayer of SA. The modified surfaces allowed for subsequent immobilization of biotinylated bovine serum albumin (bBSA) and biotinylated plasminogen (bPLG). PLG was the subject of a challenging case study, using a combination of QCM-D and surface plasmon resonance (SPR), where the immobilized protein was subjected to low molecular weight ligands that were believed to induce conformational changes. The high control of the surface chemistry allowed for the interpretation of the increased dissipation shift upon ligand binding in terms of conformational changes.

An obstacle before commercialization of the described biotinylated surfaces is that they do not seem stable for storage > 7 days. The reasons for this have to be investigated further.

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Fostock, Ziad. "QCM Sensor Chip : – Construction of plastic parts for injection molding". Thesis, KTH, Maskinkonstruktion (Inst.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-100017.

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I augusti 2007 tillfrågades författaren av Attana AB om han kunde konstruera dennes QCM-sensorchip för formsprutning som en del av hans examensarbete inom industriell design. Examensarbetet innefattade de två plastdelarna som utgör hölget av sensorchipet. Ytterliggare skulle en ny konstruktionslösning som underlättar montering av sensorchipet föreslås, en given plats för identifikationsmärkning av sensorchipet skulle implementeras och den estetiska aspekten av designen skulle slutföras inom ramarna av arbetet. Arbetsprocessen innebar ett tvärdisciplinärt uppdrag som ingenjör, designer och projektledare i nära samarbete med andra utvecklings- och tillverkningsingenjörer, materialspecialister och biokemister. Arbetet fortskred iterativt genom fyra faser, nämligen: förstudie, analys, syntes och utvärdering. Arbetet resulterade i en förenklad monteringskonstruktion och en integrerad plats för identifikationsmärkning av chipet. Designen och konstruktionen var också till en viss gräns verifierade med hänsyn till generiska riktlinjer för formsprutning och av specialister som undersökte konstruktionslösningen. En konstruktionslösning där ett snäppfäste integrerades för att underlätta montering av delarna presenterades av författaren. Dessutom presenterades ett urval av lämpliga material. I framtida arbete måste formsprutningsverktygsmakaren slutföra nödvändiga beräkningar för att tillåta eftersökta toleranser i det formsprutade sensorchipet.
In August 2007 the author was asked by Attana AB to construct its QCM sensor chip for injection molding as part of his Master Thesis in Industrial Design Engineering. The thesis work concerned the plastic housing of the sensor chip which consists of two plastic parts. In addition, a new construction solution that simplified assembly was to be proposed, a designated area for identification tagging was to be integrated into the design, and the aesthetic aspect of the design was to be finalized. The process implied working cross-disciplinary as an engineer, designer and a project manager in close collaboration with other development engineers, manufacturing engineers, material specialists and biochemists. The work iteratively progressed through the four phases: research, analysis, synthesis and evaluation. The work resulted in simplified assembly construction and the integration of a designated feature for identification-tagging. The design and construction were also verified, to a certain extent, respective of generic guidelines for injection molding and from specialists who reviewed the construction. A construction solution was proposed with an integrated snap fit design to allow simplified assembly. A selection of materials was also presented. Further investigation has to be done on behalf of the mold tool manufacturer in order to finalize the construction and with respect to tolerances.

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Cui, Li. "Conducting polymer-based QCM-interdigitated electrode hybrid electronic nose system". Thesis, University of Glasgow, 1999. http://theses.gla.ac.uk/3974/.

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This research project was concerned with the establishment and characterisation of a quartz crystal microbalance (QCM) - conductimetric interdigitated electrode hybrid "second generation" Electronic Nose system. Research objectives covered a number of technical limitations and analytical difficulties existed in the "first generation" Electronic Nose system. A wide variety of work was carried out, including the design and fabrication of the electronic nose system, the optimisation of sensors response, the device modelling, the studies of vapour-polymer interaction mechanisms and the application of the electronic nose in multi-component analysis. A QCM-interdigitated electrode hybrid sensor odour measurement system was established, and sensor fabrication techniques developed. Some important parameters corresponding to sensor characteristics were investigated such as the conditions for polymer film polymerisation. By studying 16 different coatings, "optimal" individual initial resistances were proposed, which minimise long-term baseline resistance drift, whilst maintaining good sensitivity. A set of sensors was made with low initial resistance variation. Sensor detection dynamic range was found to be dependent on the type of the coating material and the film thickness. The response of a combined hybrid sensor pair remained stable during a test period of 45 days, which showed an improved stability. The principle of the sensor's response and device modelling were addressed. The vapour-polymer interactions and sensor pair's response were linked by a sensitivity coefficient (S), which was defined as the relative resistivity change by a single molecule absorbed into the polymer film. A pair of sensors showing concentration independence over a wide concentration range can be formed on separate QCM and interdigitated electrodes with the same polymer. The combined response (Srf) can be used to identify a particular vapour. Based on the concentration independence, the proposed "odour maps" showed the feasibility of distinguishing odourants using a significantly lower number of different types of sensor coatings. This demonstrated the improved selectivity of a hybrid system compared with the single property system.

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Rezania, Yaser. "Gas Adsorption Using Conjugated Polymers : Studied by Quartz Crystal Microbalance (QCM)". Thesis, Linköping University, Department of Water and Environmental Studies, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-60049.

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Karamollaoglu, Irem. "Development Of Qcm Based Dna Biosensors For Detection Of Genetically Modified Organisms". Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608288/index.pdf.

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A great effort has been recently devoted to the development of new devices for the detection of specific sequences of DNA, due to increasing need of label - free, fast, cheap, and miniaturized analytical systems able to detect target sequences for screening purposes, especially in food industry for genetically modified organisms (GMOs). In this study, development of a QCM - based DNA biosensor for the detection of the hybridisation of CaMV 35S promoter sequence (P35S) was investigated. Attention was focused on the choice of the coating chemistry that could be used for the immobilisation of probe sequences on the gold surface of the quartz crystal. Two immobilisation procedures were tested and compared considering the amount of the immobilised probe, the extent of the hybridisation reaction, the possibility of regeneration and the absence of non - specific adsorption. The two coating methods were based on the use of self - assembled monolayers. One of them employed the interaction between the thiol and gold for the immobilisation of a thiolated P35S probe, while the other employed formation of functionalised aldehyde groups by ethylenediamine plasma polymerization on the gold surface for the immobilisation of amined P35S probes through gluteraldehyde activation. Results indicated that immobilisation of a thiolated probe provides better immobilisation characteristic, higher sensitivity for the detection of the hybridisation reaction, absence of non - specific adsorption and a higher stability with respect to the regeneration step. The optimised immobilisation procedure for the thiolated probe was used for the detection of P35S sequence in PCR - amplified DNAs and in real samples of pflp - gene inserted tobacco plants that produce ferrodoxin like protein additionally. Fragmentation of the genomic DNAs were achieved by digestion with restriction endonucleases and sonication. The obtained results from the fragmented genomic DNAs demonstrated that it is possible to detect the target sequence directly in non-amplified genomic DNAs by using the developed QCM - based DNA biosensor system. The developed QCM-based DNA biosensor represented promising results for a real-time, label - free, direct detection of DNA samples for the screening of GMOs.

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Boström, Fredrik. "Single-cycle kinetics for QCM biosensors for high throughput nanoparticle characterization application". Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-298942.

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Characterizing nanoparticles to be able to understand how they functions in the body is important for development of drugs. Furthermore with increasing number of nanoparticle product the nanotoxicity of nanoparticles is important to understand. This report is a part of the EU-project Nanoclassifier which purpose is to “develop a cost effective, high throughput screening platform for characterization of the bionanointerface and its cell-binding partners”. Single-cycle kinetic was used to determine the number of binding epitopes on polystyrene nanoparticle with transferrin corona. The number of available epitopes describes how active the Nanoparticle will be in the body. For this purpose Single-cycle kinetic methodology was successfully used on nanoparticles. Single-cycle kinetic methodology has great potential to become the standard method for high throughput nanoparticle epitope characterization.

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Duan, Xiao Xia. "Lipid based sensing of organic vapours : a study combining AFM and QCM". Thesis, Durham University, 2014. http://etheses.dur.ac.uk/10738/.

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This thesis investigates the development of a vapour sensor that is useful in fields such as environmental protection, or healthcare. A summary review of vapour sensing techniques is given, leading to the choice of exploiting a simple, low cost, high-resolution mass sensing technique-Quartz Crystal Microbalance (QCM) to fabricate a lipid based vapour sensor. Both hydrophilic and hydrophobic vapours have been introduced in the sensing experiment. Three types of lipids based sensors, which were 1, 2-dilauroyl-sn-glycero-3-phosphocholine (DLPC), 1, 2-dioctadecanoyl-sn-glycero-3-phosphocholine (DSPC), cholesterol and their mixtures, were fabricated on AT cut quartz crystal based substrates by spin coating. Atomic Force Microscopy (AFM) was used for topography analysis; QCM was used for quantitative analysis. Film thickness data suggests that a bilayer DLPC is 4.3 nm and a bilayer DSPC is 5.8 nm thick. The average film thickness is approximately proportional to the coating concentration with a constant of proportionality of 4.3 nm/mM and 5.8 nm/mM for DLPC and DSPC, respectively. The results from the AFM and QCM trials have led to the development of a controllable process for the fabrication of a repeatable amount of lipid membrane based vapour sensors. The response of each film when exposed to ethanol, methanol, toluene and cyclohexane vapours was recorded. The results show that hydrophilic compounds could be recognised efficiently by lipids having shorter alkyl chains. Frequency changes caused by adsorption of test vapours could be enhanced when cholesterol was co-immobilised in the lipid layer. The best sensing behaviour (that is, excellent response, reversibility and negligible baseline drift) and sensitivity was achieved in a sensor coated with DLPC/DSPC/cholesterol mixed film (50 mg/ml DLPC/DSPC/cholesterol-1:1:8 in volume ratio). The limit of detection of this sensor is 400 ppm to ethanol, 800 ppm to methanol, 1300 ppm to toluene and 2300 ppm to cyclohexane, separately.

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Peduru, Hewa Thamara Mangalika, e s3007291@student rmit edu au. "Development and evaluation of QCM sensors for the detection of influenza virus from clinical samples". RMIT University. Applied Science, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080516.160600.

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The Quartz crystal microbalance (QCM) is a very sensitive mass-detecting device which is based on changes in to the vibrational frequency of quartz crystals after adsorption of substances to a modified crystal surface. In this study a QCM-based biosensor was developed for the rapid diagnosis of influenza viruses and its suitability and limitations were compared with currently available diagnostic methods on 67 clinical samples (nasal washes) received during the 2005 Australian winter. The type-specific and conserved viral M1 proteins of both A/PR/8/34 and B/Lee/40 viruses were used to prepare polyclonal antisera for the development of an ELISA. The limits of detection of ELISAs for the detection of purified A/PR/8/34 and B/Lee/40 nviruses were 20Ýg/mL nand 14 Ýg/mL using polyclonal antibodies, and 30 Ýg/mL and 20 Ýg/mL for monoclonal antibodies, respectively. The limit for detection of each virus was 104 pfu/mL, irrespective of whether antisera or monoclonal antibodies were used for capture. Non-purified cell culture-grown preparations of either virus could be detected at 103 pfu/mL The QCM utilised the same reagents used in ELISAs. However, a number of parameters were then further optimised to improve the sensitivity of the tests. These included blocking of non-specific binding, examination of the effects of flow-cell compression, the role of pH, flow rate, antibody concentration and the addition of protein A to the crystal surfaces of the biosensor. The lowest virus concentration that could be detected with the QCM was 104 pfu/mL for egg-grown preparations of both A/PR/8/34 and B/Lee/40, which could be detected within 30 min. However, conjugation of 13 nm gold nanoparticles to a second detector antibody resulted in a 10-fold increase in sensitivity and a detection limit of 103 pfu/mL that could be determined within 1 h. The direct detection of the influenza viruses in nasal samples was not possible by QCM because of the significant frequency fluctuation that was probably caused by the viscosity of the samples. Therefore, an additional culture step of 12 h was required, which increased the processing time to 2 days. The QCM/nanoparticle method was shown to be as sensitive as the standard cell culture method, and the QCM method as sensitive as the shell vial method. The QCM and QCM/nanoparticle methods were shown to be 81 and 87% as sensitive and both were 100% as specific as the real-time polymerase chain reaction. However, for use in rapid diagnosis, improvements are required to remove frequency fluctuation resulting from the direct use of nasal samples.

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Stålgren, Johan Jim Roger. "Adsorption of Surfactants at the Solid-Liquid Interface : A Quartz Crystal Microbalance Study". Doctoral thesis, KTH, Chemistry, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3291.

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MATTOS, Alessandra Batista de. "Determinação da troponina T cardíaca humana empregando sistema de microbalança de quartzo por injeção de fluxo". Universidade Federal de Pernambuco, 2007. https://repositorio.ufpe.br/handle/123456789/1774.

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As determinações da troponina cardíaca T (TnT) podem contribuir para o diagnóstico e tratamento de infarto agudo do miocárdio e para a estratificação dos riscos dos pacientes com síndromes coronárias agudas no que respeita ao risco relativo de mortalidade. Neste trabalho, um sistema de microbalança de quartzo por injeção de fluxo baseado na alteração de freqüência elétrica em resposta à ligação antígeno-anticorpo foi empregado para determinação da TnT cardíaca. As variações de freqüências foram registradas por um contador de freqüência acoplado a um microcomputador. O anticorpo monoclonal específico foi imobilizado sobre a superfície de um eletrodo de cristal de quartzo por ligação irreversível via monocamadas auto-organizadas. O adsorbato composto por filme de alcanotiól foi formado incubando uma solução de 2-aminoetanotiol (cisteamina) por 2 h, seguido por glutaraldeído a 2,5% (v/v). Em seguida, anticorpos monoclonais anti- troponina T (anti-TnT) foram covalentemente imobilizados sobre o eletrodo de ouro do cristal de quartzo e foi usada uma solução de glicina (10mM) como agente bloqueante. Com o imunossensor desenvolvido foi possivel medir concentrações de troponina T com limite de detecção de 0,025 ng/mL. A superfície do sensor pode ser regenerada por injeção de uma solução do dodecil-sulfato de sódio 1% (p/v). A determinação da TnT foi realizada em amostras de soros humanos permitindo seu uso nas aplicações clínicas para diagnóstico do IAM

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Livros sobre o assunto "QCM"

Bellicaud, David. QCM d'anatomie. Paris: Éditions ESTEM, 2001.

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Jacques, Poirier. Histologie: 300 QCM. Paris: Masson, 2002.

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Renault-Brahinsky, Corinne. QCM droit des obligations. Paris: Gualino, 1999.

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Le grand QCM du vin. Paris: Dunod, 2007.

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Gontier, Jean R. La biochimie en 1001 QCM. Paris: Ellipses, 2004.

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Berthou, Benoît. QCM commentés de culture générale. Paris: Ellipses, 2004.

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Borel, Frédéric. Comprendre la physique: QCM illustré. Paris: Eyrolles, 2007.

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300 QCM de grammaire française. Louvain-la-Neuve: De Boeck-Duculot, 2002.

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2500 QCM de culture générale. 2^a ed. Paris: l'Étudiant, 2012.

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Biette, Grégory. L' anatomie en 1001 QCM. Paris: Ellipses, 2001.

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Capítulos de livros sobre o assunto "QCM"

Perrot, Hubert. "Piezoelectric Transduction (QCM)". In Chemical Sensors and Biosensors, 71–91. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118561799.ch4.

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Schröder, Jens, Ralf Borngräber, Frank Eichelbaum e Peter Hauptmann. "Sophisticated Interface Electronics for QCM". In Transducers ’01 Eurosensors XV, 104–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59497-7_24.

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Liu, Guangming, e Guangzhao Zhang. "Basic Principles of QCM-D". In SpringerBriefs in Molecular Science, 1–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39790-5_1.

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Waugh, Sam, Brian Hanlon e Tim Menzies. "The temporal QCM modelling language". In Advanced Topics in Artificial Intelligence, 261–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/bfb0095058.

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Bédard, Claude Y., e John E. Lemieux. "Tailings management framework at QCM". In Tailings and Mine Waste 2000, 85–89. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003078579-11.

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Johannsmann, Diethelm. "Considerations for Well-Controlled QCM Experiments". In The Quartz Crystal Microbalance in Soft Matter Research, 377–85. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07836-6_17.

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Johansson, Thomas. "Affinity Measurements Using Quartz Crystal Microbalance (QCM)". In Antibody Engineering, 683–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-01144-3_43.

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Liu, Lishang. "Nucleic Acid Amplification Strategies Based on QCM". In Nucleic Acid Amplification Strategies for Biosensing, Bioimaging and Biomedicine, 197–209. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7044-1_10.

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Miller, Brendan, e Jacqueline Krim. "Quartz Crystal Microbalance (QCM) Applications to Tribology". In Encyclopedia of Tribology, 2727–33. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_1089.

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Borovsky, B., M. Abdelmaksoud e J. Krim. "STM-QCM Studies of Vapor Phase Lubricants". In Nanotribology, 361–75. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-1023-9_26.

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Trabalhos de conferências sobre o assunto "QCM"

Su, Junwei, Hamed Esmaeilzadeh e Hongwei Sun. "Study of Frequency Response of Quartz Crystal Microbalance to Different Wetting States of Micropillar Surfaces". In ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fedsm2017-69550.

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Enhanced wettability, known as superhydrophobicity or superhydrophilicity has drawn extensive attention in the past for wide range potential applications such as superhydrophobic surfaces for self-cleaning, anti-icing, dropwise condensation, and drag reduction. This research focuses on the investigation of the frequency responses of quartz crystal microbalance (QCM) devices coated with micropillars to the different wetting states of drops. A theoretical model was developed to correlate the resonant frequency shifts of QCMs with the penetrated (Wenzel state) and suspended (Cassie state) states based on the Euler-Bernoulli beam theory. In the experimental validation of the theory, Poly(methyl methacrylate) (PMMA) micropillars were fabricated on the QCMs using nanoimprint lithography (NIL) method and the different wetting states were generated by plasma treatment and chemical coating. The frequency shifts of the QCM device were measured by a network analyzer. A good agreement between experimental measurements and theoretical predictions was obtained. It was found that the micropillars operating in the penetrated state results in one order of magnitude higher frequency shift of QCM than the micropillars in suspended state. There exists a highly nonlinear vibrating behavior of micropillars with different heights in both penetrated and suspended states. The QCM based technology is a valuable tool for studying the wettability of different superhydrophobic or superhydrophilic surfaces.

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Sun, Hejian, John C. Donini, Kirk H. Michaelian, Sankara Papavinasam e R. Winston Revie. "Application of the Quartz Crystal Microbalance to Corrosion Investigation". In 1998 2nd International Pipeline Conference. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/ipc1998-2026.

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The quartz crystal microbalance (QCM) provides an extremely sensitive technique for detecting small changes in mass and viscosity on the quartz crystal surface. QCM can be used in oil, gas or water without the problems of high solution resistance. In order to use QCM to model pipeline corrosion, an iron quartz crystal electrode was prepared using an electrodeposition method. The reproducibility, effectiveness and accuracy of the iron QCM were tested in salt solution. The adsorption of amines was studied to investigate their effects on the corrosion behaviour of the iron QCM.

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Leung, W. W. F., C. Chao, C. H. Cheng, K. F. Lei, D. Ngan, C. K. Lau e W. C. Tse. "Measurement of Solvent Vapor Absorption by Polydimethylsiloxane Using Quartz Crystal Microbalance". In 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2008. http://dx.doi.org/10.1115/micronano2008-70163.

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A new micro-electromechanical system (MEMS) gas sensor has been developed using quartz crystal microbalance (QCM) with adsorbent coated in form of nanofibers on the QCM sensor. The nanofibers with fiber diameter typically around 200–300 nm increases the specific surface area to enhance adsorption. The QCM is made to oscillate at its natural resonance frequency. Upon exposure of the gas sensor to a given gas, the adsorbed gas onto the nanofibers adds a small mass which changes the natural frequency of the oscillation. By detecting the frequency shift due to adsorption of a given gas, the presence of the gas is detected, and by measuring the frequency shift, the amount of gas being adsorbed at a given pressure and temperature is quantified via the Sauerbrey equation [1]. A circuit has been developed to read the frequency shift due to the energy dissipation in the QCM coated with Polydimethylsiloxane (PDMS) nanofibers under the environment of several solvent vapors. The developed circuit includes two crystal oscillator circuits, two QCM’s which are respectively 1MHz reference QCM and a coated QCM, RC filter and AND gates. The results of the frequency shift between the reference QCM and the coated QCM were recorded on the oscilloscope so as to investigate the relationships between the frequency shift and the amount of vapor adsorbed for different gases. Ultimately, Volatile Organic Compounds (VOCs) are the target to be monitored and a MEMS based sensor will be developed similar to the present QCM gas sensor discussed herein. This work provides the feasibility study for using nanofiber coating to enhance the adsorbent specific area and a stand-alone QCM sensor for making measurement.

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Esmaeilzadeh, Hamed, George Cernigliaro, Junwei Su, Lin Gong, Iman Mirzaee, Majid Charmchi e Hongwei Sun. "The Effects of Material Properties on Pillar-Based QCM Sensors". In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52533.

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Quartz crystal microbalance (QCM) device is a highly sensitive mass sensor (sensitivity: 0.5 ng/cm2) with a wide range of applications including biosensing, thin film deposition, surface chemistry, volatile organic compounds (VOC) and gaseous analytes detection. A recent study shows that several orders of magnitude improvement in sensitivity can be achieved by attaching microscale Polymethyl methacrylate (PMMA) pillars onto the surface of the QCM (QCM-P) to form a two-degree of freedom coupled resonant system. In this research, the effects of residual layer from the nanoimprinting process of micro-pillars and polydispersity index (Pd) of PMMA molecules on the sensitivity of QCM-P devices are investigated both experimentally and theoretically. The results show the residual layer behaves as an additional mass and significantly reduces the frequency shift of QCM-P sensor while a low polydispersity of PMMA improves the sensor responses. The outcome of this research leads to an in-depth understanding of the effects of material and fabrication process on QCM-P sensors which will build a solid foundation for the further improvement of QCM-P devices for a variety of applications such as protein binding measurement in drug discovery, gas detection for environmental monitoring and protection.

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Wang, Pengtao, Majid Charmchi, Mengyan Shen e Hongwei Sun. "Hydrophobicity of Nanostructured Films Characterized by a Quartz Crystal Microbalance". In ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icnmm2012-73202.

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The hydrophobicity of two types of nanostructured polymer films were fabricated and characterized with a novel quartz crystal microbalance (QCM) technique to investigate their static and dynamic hydrophobic properties. The nanofibrous films of polymethylmethacrylate (PMMA), PMMA/Polydimethylsiloxane (PDMS) and Polyacrylonitril (PAN) were prepared with an electrospinning process and a PMMA film with nanoscale roughness was fabricated using nanoimprint lithography (NIL) technique. Significantly different static and dynamic hydrophobicities (wettability) were found among these films and the correlation between hydrophobicity and the mechanical impedance of QCM to these films were developed both experimentally and theoretically. It was shown that QCM is capable of quantitatively characterizing the hydrophobicity of these nanostructured polymer surfaces. For nanofibrous films, the double layers — a viscoelastic nanofiber film and a liquid layer result in a nonlinear combination of mechanical impedances of QCM. To simplify the analysis, an apparent viscosity was introduced in the analysis to take into account the interactions between liquid and polymer surfaces. For NIL PMMA film, the hydrophobicity was altered by coating nano-roughened surface with a Teflon layer. The reduction in the mechanical impedance of QCM clearly demonstrates the enhancement of hydrophobicity. The experimental results showed that the hydrophobic surface lead to a small mechanical impedance while the hydrophilic surface resulted in a large mechanical impedance of QCM.

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Zhuang, H., P. Lu e S. P. Lim. "Adsorption-Induced Surface Stress Effect on the Resonance Behavior of a Quartz Crystal Microbalance". In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95193.

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The effect of adsorption-induced surface stress on the response of a quartz crystal microbalance (QCM) with reduced size is investigated. The model proposed here incorporates the adsorption-induced surface stress into the basic equations, where surface stress is characterized by experimentally determined parameters. Some numerical examples show that as the dimensions of a QCM shrinks, surface stress trends to play an important role in sensing, and is more significant for smaller scales. Therefore, the measured resonance frequency shift of a QCM is induced by combination of mass loading and adsorption-induced surface stress. The model discussed here can be used to provide an insight into the fundamental understanding of the effect of adsorption-induced surface stress on micro- and nano-QCM response of deposited metal films, or bio-molecular adsorption.

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Su, Junwei, Hamed Esmaeilzadeh, Chefu Su, Majid Charmchi, Marina Ruths e Hongwei Sun. "Characterization of Jumping-Droplet Condensation on Nanostructured Surfaces With Quartz Crystal Microbalance". In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72315.

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The spontaneously jumping motion of condensed droplets by coalescence on superhydrophobic surfaces has been an active area of research due to its great potential for enhancing the condensation efficiency. Despite a considerable amount of microscopic observations, the interfacial wetting characterization during jumping-droplet condensation is still notably lacking. This work focuses on applying a novel acoustic sensor - quartz crystal microbalance (QCM), to characterize the interfacial wetting on nanostructured surfaces during jumping-droplet condensation. Copper oxide nanostructures were generated on the surface of QCM with a chemical etching method. Based on the geometry of the nanostructures, we modified a theoretical model to reveal the relationship between the frequency shift of the QCM and the wetting states of the surfaces. It was found that the QCM is extremely sensitive to the penetrated liquid in the structured surfaces. Then, the QCM with nanostructured surface was tested on a customed flow condensation setup. The dynamic interfacial wetting characteristics were quantified by the normalized frequency shift of the QCM. Combined with microscopic observation of the corresponding drop motion, we demonstrated that partial wetting (PW) droplets with an about 25% penetrated area underwent spontaneously jumping by coalescence. However, the PW droplets no longer jumped when the penetrated area exceeds 50% due to the stronger adhesion between liquid and the surface. It shows that the characterization of the penetrated liquid in micro/nanostructures, which is very challenging for microscopic observation, can be easily carried out by this acoustic technique.

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Su, Junwei, Murat Inalpolat, Tingjian Ge, Hamed Esmaeilzadeh e Hongwei Sun. "Experimental Study and Analysis of Dropwise Condensation Using Quartz Crystal Microbalance". In ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ht2016-1033.

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This work reports a novel Quartz Crystal Microbalance (QCM) based method to analyze the droplet-micropillar surface interaction quantitatively during dropwise condensation. A combined nanoimprinting lithography and chemical surface treatment approach was utilized to directly fabricate the micropillar based superhydrophobic surface on the QCM substrate. The normalized frequency shift of the QCM device and the microscopic observation of the corresponding nucleation, drop growth, and drop coalescence processes clearly demonstrate the different characteristics of these condensation states. In addition, a synchrosqueezed wavelet spectrum based multi-resolution technique was utilized to analyze the resonant signal from the QCM sensor in both time and frequency domains simultaneously. An integrated discrete system modeling along with a hybrid signal and image processing approach was adopted to identify the response of the micropillars under different stages of dropwise condensation (DWC). The outcome of this signal processing research leads to a fundamental understanding of DWC spanning multiple time and length scales. The proposed study will also contribute to an in-depth understanding of different hydrophobic surfaces and DWC through this advanced signal processing and surface treatment. The developed QCM system provides a valuable tool for the dynamic characterization of different condensation processes.

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Schlereth, F. H., A. K. Mahabalagiri, A. Khadeer, T. McLoed, J. T. Spencer e K. S. Sweder. "Frequency measurement for QCM applications". In 2015 International Conference on Industrial Instrumentation and Control (ICIC). IEEE, 2015. http://dx.doi.org/10.1109/iic.2015.7150919.

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Zhang, Zheng, Hanhong Chen, Jian Zhong, Ying Chen e Yicheng Lu. "ZnO Nanotip-based QCM Biosensors". In Proceedings of the 2006 IEEE International Frequency Control Symposium and Exposition. IEEE, 2006. http://dx.doi.org/10.1109/freq.2006.275444.

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Relatórios de organizações sobre o assunto "QCM"

Schneider, T. W., G. C. Frye, S. J. Martin, R. J. Kottenstette, G. C. Osbourn, J. W. Bartholomew, L. Weisenbach, T. V. Bohuszewicz e D. H. Doughty. Quartz crystal microbalance (QCM) arrays for solution analysis. Office of Scientific and Technical Information (OSTI), janeiro de 1997. http://dx.doi.org/10.2172/425293.

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Park, Heai-Ku, Kathryn Podolske, Zafar Munshi, W. H. Smyrl e B. B. Owens. QCM and Electrochemical Studies of Li Intercalation in V6O13. Fort Belvoir, VA: Defense Technical Information Center, outubro de 1990. http://dx.doi.org/10.21236/ada228849.

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Detmold, William. Multi-meson systems in lattice QCD / Many-body QCD. Office of Scientific and Technical Information (OSTI), agosto de 2013. http://dx.doi.org/10.2172/1183983.

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Brodsky, S. Light-Front QCD. Office of Scientific and Technical Information (OSTI), novembro de 2004. http://dx.doi.org/10.2172/839799.

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Abe, Toshinori. QCD with SLD. Office of Scientific and Technical Information (OSTI), outubro de 1999. http://dx.doi.org/10.2172/15076.

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Plano, Richard J. QCD at SLD. Office of Scientific and Technical Information (OSTI), julho de 2003. http://dx.doi.org/10.2172/813292.

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Greene, Anne, Kelly Waldron e Nuala Calnan. Quality Risk Management: State of the Industry—Part 1. Has the Industry Realized the Full Value of ICH Q9? Institute of Validation Technology, janeiro de 2014. http://dx.doi.org/10.1080/21507090.ar1152014agkwnc-qrmsoi.

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This paper summarizes research designed to characterize the current state of pharmaceutical and biotechnology industries with respect to the adoption of Quality Risk Management as per ICH Q9. The research supports the hypotheses that the full value of QRM with respect to product quality and patient safety has not yet been realized. In addition, industry appears to be lagging behind regulatory expectations with respect to QRM maturity, indicating that current approaches to QRM require significant improvement.

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Devlin, T. QCD physics at CDF. Office of Scientific and Technical Information (OSTI), outubro de 1996. http://dx.doi.org/10.2172/402488.

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Harris, R. QCD physics at CDF. Office of Scientific and Technical Information (OSTI), maio de 1992. http://dx.doi.org/10.2172/10161484.

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Seybold, Patricia. QCE Resolutions for 2005. Boston, MA: Patricia Seybold Group, janeiro de 2005. http://dx.doi.org/10.1571/psgp1-21-05cc.

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