Related Experiment Video
Updated: Jun 16, 2026
08:07
Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes
Published on: March 9, 2019
Electrodeless QCM-D for lipid bilayer applications.
Angelika Kunze1, Michael Zäch, Sofia Svedhem
1Dept. of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden. angelika.kunze@chalmers.se
Biosensors & Bioelectronics
|February 16, 2010
Summary
Electrodeless quartz crystal microbalance with dissipation monitoring (QCM-D) enables defect-free lipid bilayer formation on various surfaces. This technique offers advantages over traditional methods for lipid bilayer research.
Area of Science:
- Biophysics
- Materials Science
- Surface Science
Background:
- Supported lipid bilayers (SLBs) are crucial models for cell membranes.
- Quartz crystal microbalance with dissipation monitoring (QCM-D) is a sensitive technique for studying surface-bound layers.
- Traditional QCM-D sensors utilize electrode-coated quartz crystals, which can have limitations.
Purpose of the Study:
- To investigate the formation kinetics of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) SLBs using an electrodeless QCM-D setup.
- To compare SLB formation on different SiO(2) surfaces: standard electrode-coated, electrodeless sputter-coated, and uncoated electrodeless.
- To evaluate the suitability of electrodeless QCM-D for neutral, positively, and negatively charged SLBs.
Main Methods:
- Utilized an electrodeless quartz crystal microbalance with dissipation monitoring (QCM-D) setup.
- Formed POPC SLBs on three different SiO(2) surfaces.
- Employed atomic force microscopy (AFM) to image SLB formation and surface roughness.
Main Results:
- Achieved defect-free, complete POPC SLB formation on all tested SiO(2) surfaces.
- Observed differences in SLB formation kinetics attributed to variations in surface roughness.
- Demonstrated successful formation of neutral, positively, and negatively charged SLBs using electrodeless sensors.
Conclusions:
- Electrodeless QCM-D is a viable technique for studying lipid bilayer formation.
- Surface roughness significantly influences SLB formation kinetics.
- Electrodeless QCM-D offers advantages such as optical transparency, extended sensor lifetime, and reduced costs compared to electrode-coated sensors.
Related Concept Videos
01:15Potentiometry: Membrane Electrodes
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
01:30Capillary Electrophoresis: Applications
Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
01:24Electrochemical Systems
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...