Enhanced sensitivity of SAW gas sensor coated molecularly imprinted polymer incorporating high frequency stability oscillator
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Molecularly imprinted polymer
In this experiment,cephalosporins drugs nucleus 7-ACA as a template molecule,4-vp as functional monomer,in certain conditions,synthesis of 7-ACA molecularly imprinted polymer,equilibrium binding experiment with a combination of properties of the polymer.And study of the 7-ACA molecularly imprinted polymer selective for cephalosporins drugs.The results showed that,7-ACA molecularly imprinted polymer for cephalosporin drugs have a good selectivity.It can be used as animal food cephalosporin drugs extraction separation of purification material.
Molecularly imprinted polymer
Molecular imprinting
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A liquid column resonance (LCR) transducer, also referred to as an organ pipe transducer, is a type of transducer that utilizes the liquid column resonance mode to produce acoustic energy underwater. Traditional transducers, such as piezoelectric rings or Janus transducers, are commonly used as the driving source in LCR transducers. A flextensional transducer (FT) is introduced into the LCR transducer as the driving source because of the relatively larger volume velocity at low frequencies. Moreover, the eigen-mode of the Class IV FT is easier to couple with the LCR mode to broaden the bandwidth of a LCR transducer. To overcome the problems associated with the low stiffness of elliptical metal pipes, an improved aluminum pipe, which has a cross-beam to increase the stiffness, was proposed and utilized in a LCR transducer driven by a Class IV FT. The fabricated LCR transducer prototype driven by the Class IV FT has two resonance peaks from 700–2000 Hz, and the transmitting voltage response values of these peaks are 132.1 and 137.8 dB (re 1 μPa/V @1 m). Comparing with an LCR transducer driven by a 33-mode ring, the results show that the LCR transducer driven by a Class IV FT provides good efficiency and broadband characteristics.
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Molecularly imprinted technology (MIT) has been widely employed to produce stable, robust and cheap molecularly imprinted polymer (MIP) materials that possess selective binding sites for recognition of target analytes in food, such as pesticides, veterinary drugs, mycotoxins, illegal drugs and so on.
Molecularly imprinted polymer
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Restricted access molecularly imprinted polymers (RAMIPs) have been efficiently used for the extraction of small organic molecules from untreated biological matrices (e.g. blood, plasma, serum, and milk). These materials have been obtained by modifying the external surface of conventional molecularly imprinted polymers (MIPs) with hydrophilic monomer grafting, crosslinked protein capsule or a combination of both. These sorbents aggregate the selectivity of MIPs with the ability to exclude macromolecules of restricted access materials (RAMs), being widely employed in solid phase extraction techniques, beyond their use in sensors. In this review, we discuss about the design and application of RAMIPs in biological sample preparation, emphasizing the future trends and remaining challenges of this technology for bioanalyses.
Molecularly imprinted polymer
Molecular imprinting
Solid phase extraction
Sample Preparation
Molecular Recognition
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Resistive touchscreen
SIGNAL (programming language)
Smart transducer
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The Tonpiltz transducer is one of the critical elements in sonar systems. The transducer's properties strongly depend on the number of piezoelectric ceramic segments and mechanical elements such as head mass, tail mass, prestress rod and so on. In this research, the relationship between the physical and electrical characteristics of the Tonpiltz transducer is deduced. The influences of material parameters and mechanical structure are also discussed. An ingenious method is proposed to evaluate the mechanical compliance and effective electromechanical coupling coefficient of the Tonpiltz transducer. A lumped equivalent circuit of the Tonpiltz transducer is also presented to estimate the weight and length of head and tail masses of the transducer, and to simulate the transducer's electrical and physical properties. A practical design example is also developed to confirm the simulation.
Smart transducer
Electromechanical coupling coefficient
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Molecularly imprinted polymers (MIPs) are macromolecular matrices that can mimic the functional properties of antibodies, receptors and enzymes while possessing higher durability. As such, these polymers are interesting materials for applications in biomimetic sensor, drug synthesis, drug delivery and separation. In this study, we prepared MIPs and molecularly imprinted nanospheres (MINs) as receptors with specific recognition properties toward tocopherol succinate (TPS) in comparison to tocopherol (TP) and tocopherol nicotinate (TPN). MIPs were synthesized using methacrylic acid (MAA) as functional monomer, ethylene glycol dimethacrylate (EGDMA) as crosslinking agent and dichloromethane or acetronitrile as porogenic solvent under thermal-induced polymerization condition. Results indicated that imprinted polymers of TPS-MIP, TP-MIP and TPN-MIP all bound specifically to their template molecules at 2 folds greater than the non-imprinted polymers. The calculated binding capacity of all MIP was approximately 2 mg per gram of polymer when using the optimal rebinding solvent EtOH:H2O (3:2, v/v). Furthermore, the MINs toward TPS and TP were prepared by precipitation polymerization that yielded particles that are 200-400 nm in size. The binding capacities of MINs to their templates were greater than that of the non-imprinted nanospheres when using the optimal rebinding solvent EtOH:H2O (4:1, v/v). Computer simulation was performed to provide mechanistic insights on the binding modalities of template-monomer complexes. In conclusion, we had successful prepared MIPs and MINs for binding specifically to TP and TPS. Such MIPs and MINs have great potential for industrial and medical applications, particularly for the selective separation of TP and TPS.
Molecularly imprinted polymer
Ethylene glycol dimethacrylate
Precipitation polymerization
Molecular Recognition
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To improve the pulse-echo sensitivity of a piezopolymer transducer while preserving its broad bandwidth property, several multilayer transducer design approaches have been suggested. This paper presents formulae describing three types of multilayer transducers-a Barker code multilayer-, folded multilayer and switchable Barker code multilayer transducer. Based on the formulae derived, the pulse-echo responses of the multilayer transducers under various excitation signals were calculated and compared with those achievable with an equivalent PZT transducer. Also, the influence of a tissue layer on the transducer responses was examined. The simulation results indicated that the switchable Barker code transducer design outperforms all other transducer designs analyzed with respect to the axial resolution and overall sensitivity in the medical imaging frequency range. To verify the simulation results, several prototypes of multilayer transducers were fabricated and tested in water. A good agreement between the experimental results and the corresponding computer predictions was achieved.
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Molecularly imprinted polymer
Molecular imprinting
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