Impedance Analysis of Quartz Oscillators, Contacted on One Side with a Liquid

Beck, Ralf; Pittermann, Udo; Weil, K. G.

doi:10.1002/bbpc.198800327

Cited by 93 publications

(46 citation statements)

References 6 publications

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“…Here, we present and validate a new method for measuring the deformation of nm-sized liposomes adsorbing on surfaces. Although it is based on deducing the height of surface-adsorbed liposomes (labeled as h in Figure 1) from QCM [17][18][19][20][21] measurements, it does not rely on a model. Previously, we showed that this method reliably and quantitatively yields the size of the adsorbed particles for stiff particles that do not deform upon adsorption; in that case, h ∼ 2R (Figure 1(a)), where R is the radius of particles in solution (e.g., measured with dynamic light scattering).…”

Section: Introductionmentioning

confidence: 99%

Adsorbed liposome deformation studied with quartz crystal microbalance

Reviakine

Gallego

Johannsmann

et al. 2012

The Journal of Chemical Physics

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Deformation of surface-adsorbed liposomes is an important parameter that governs the kinetics of their transformations, but one that is very difficult to measure in the case of nm-size liposomes. We investigate the deformation of dimyristoyl phosphatidyl choline liposomes by quartz crystal microbalance (QCM) as a function of temperature and show that it follows the dependence of this lipid's bending modulus on temperature, as expected from theoretical considerations. To corroborate our approach, we model QCM response from adsorbed liposomes by explicitly considering their shape and mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Adsorbed liposome deformation studied with quartz crystal microbalance

Reviakine

Gallego

Johannsmann

et al. 2012

The Journal of Chemical Physics

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“…A parallel capacitance C p , caused by the electrodes on the quartz and any stray capacitance 3. A resistive component R 0 The resistance R 0 is a measure of mechanical losses from the vibrating quartz, and it therefore reflects the viscoelastic properties of the contact- ing liquid [240], [241] or a deposited film [242]. Surface roughness also influences the value of R 0 [243].…”

Section: Fundamental Principles and Basic Types Of Transducersmentioning

confidence: 99%

“…Likewise, immobilized peptide molecules may alter the tertiary shape by changing the ionic strength, resulting in a different surface roughness. Changes in the vibrating mass correspond to changes in the self-inductance L 0 [244], [245]. Thus, the resonance frequency of the motional arm ( f m ; see Fig.…”

Section: Fundamental Principles and Basic Types Of Transducersmentioning

confidence: 99%

Chemical and Biochemical Sensors

Cammann¹,

Roß²,

Katerkamp³

et al. 2001

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction to the Field of Sensors and Actuators 2. Chemical Sensors 2.1. Introduction 2.2. Molecular Recognition Processes and Corresponding Selectivities 2.2.1. Catalytic Processes in Calorimetric Devices 2.2.2. Reactions at Semiconductor Surfaces and Interfaces Influencing Surface or Bulk Conductivities 2.2.3. Selective Ion Conductivities in Solid‐State Materials 2.2.4. Selective Adsorption ‐ Distribution and Supramolecular Chemistry at Interfaces 2.2.5. Selective Charge‐Transfer Processes at Ion‐Selective Electrodes (Potentiometry) 2.2.6. Selective Electrochemical Reactions at Working Electrodes (Voltammetry and Amperometry) 2.2.7. Molecular Recognition Processes Based on Molecular Biological Principles 2.3. Transducers for Molecular Recognition: Processes and Sensitivities 2.3.1. Electrochemical Sensors 2.3.1.1. Self‐Indicating Potentiometric Electrodes 2.3.1.2. Voltammetric and Amperometric Cells 2.3.1.3. Conductance Devices 2.3.1.4. Ion‐Selective Field‐Effect Transistors (ISFETs) 2.3.2. Optical Sensors 2.3.2.1. Fiber‐Optical Sensors 2.3.2.2. Integrated Optical Chemical and Biochemical Sensors 2.3.2.3. Surface Plasmon Resonance 2.3.2.4. Reflectometric Interference Spectroscopy 2.3.3. Mass‐Sensitive Devices 2.3.3.1. Introduction 2.3.3.2. Fundamental Principles and Basic Types of Transducers 2.3.3.3. Theoretical Background 2.3.3.4. Technical Considerations 2.3.3.5. Specific Applications 2.3.3.6. Conclusions and Outlook 2.3.4. Calorimetric Devices 2.4. Problems Associated with Chemical Sensors 2.5. Multisensor Arrays, Electronic Noses, and Tongues 3. Biochemical Sensors (Biosensors) 3.1. Definitions, General Construction, and Classification 3.2. Biocatalytic (Metabolic) Sensors 3.2.1. Monoenzyme Sensors 3.2.2. Multienzyme Sensors 3.2.3. Enzyme Sensors for Inhibitors ‐ Toxic Effect Sensors 3.2.4. Biosensors Utilizing Intact Biological Receptors 3.3. Affinity Sensors ‐ Immuno‐Probes 3.3.1. Direct‐Sensing Immuno‐Probes without Marker Molecules 3.3.2. Indirect‐Sensing Immuno‐Probes using Marker Molecules 3.4. Whole‐Cell Biosensors 3.5. Problems and Future Prospects 4. Actuators and Instrumentation 5. Future Trends and Outlook

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“…Among the many piezoelectric materials, α-quartz is most commonly studied and used as piezoelectric oscillator, because desired features can be achieved through various cuts of its native crystals [2,3,[27][28][29]:…”

Section: Transducer-oscillator Materials Configurationsmentioning

confidence: 99%

“…In such a case, the apparent mass changes calculated from the Sauerbrey equation may be erroneous. However, impedance measurements and QCM studies of systematic thickness variations can help to interpret the observed frequency shifts [7,15,[29][30][31][32][34][35][36][37][38][39][40][42][43][44].…”

Section: Quartz Oscillator Coated With a Viscous Surfacementioning

confidence: 99%