Afm Calibration
Afm Calibration - Related Videos
08:21
Quantitative Hardness Measurement by Instrumented AFM-indentation
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Cited by 6 •
2016
This experimental protocol describes how atomic force microscopy can be used to measure hardness at the true nanometer scale and to detect single atomistic plasticity events.
09:47
AFM and Microrheology in the Zebrafish Embryo Yolk Cell
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Cited by 3 •
2017
The lack of tools to measure material properties and tensional parameters in vivo prevents validating their roles during development. We employed atomic force microscopy (AFM) and nanoparticle-tracking to quantify mechanical features on the intact zebrafish embryo yolk cell during epiboly. These methods are reliable and widely applicable avoiding intrusive interventions.
07:43
Calibration Curves
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2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia Calibration curves are used to understand the instrumental response to an analyte and predict the concentration in an unknown sample. Generally, a set of standard samples are made at various concentrations with a range than includes the unknown of interest and the instrumental response at each concentration is recorded. For more accuracy and to understand the error, the response at each concentration can be repeated so an error...
01:11
Glassware Calibration
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2024
Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes. Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
08:12
Pressure Transducer: Calibration Using a Pitot-static Tube
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2023
Source: Shreyas Narsipur, Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC Fluid pressure is an important flow characteristic that is required to determine the aerodynamics of a system. One of the oldest and still existing pressure measurement systems is the manometer due to its accuracy and simplicity of operation. The manometer is generally a U-shaped glass tube that is partially filled with liquid, as shown in Figure 1. The U-tube manometer requires no...
FAQs
These parameters convert instrument responses into physical quantities. The cantilever’s spring constant relates applied force to its mechanical response, while deflection sensitivity links the detected signal to actual cantilever deflection. Errors in either value can distort force estimates and topographic measurements, so determining them is central to quantitative AFM work.
Thermal noise provides a measured signal associated with cantilever motion, whereas a known displacement offers a controlled reference for scanner or detector response. Using these approaches helps establish how electronic signals correspond to physical movement or force. The resulting parameters support more reliable interpretation of nanoscale measurements.
Probe geometry affects the interaction between the cantilever and the measured surface, so calibration cannot be interpreted independently of the probe. Environmental conditions can also change instrument behavior and measurement stability. Accounting for both factors reduces the risk that apparent differences in samples actually reflect the measurement setup rather than the biological or material property being studied.
A practical workflow begins with reference standards or known displacements, followed by measurements of cantilever response and thermal noise where appropriate. Researchers then determine parameters such as spring constant, deflection sensitivity, and scanner movement. The calibration should also consider probe geometry and environmental conditions before data from cells, tissues, biomaterials, or molecular interactions are quantitatively interpreted.
AFM calibration is especially important when bioengineering studies aim to quantify mechanical properties rather than only visualize surface features. It supports measurements involving cells, tissues, biomaterials, and molecular interactions, where reliable force, distance, and topography relationships are needed. Calibration allows results from different samples or experiments to be compared with greater confidence and reproducibility.
By anchoring instrument signals to physical quantities, calibration helps researchers decide whether observed variation reflects the sample or the measurement system. This is important when comparing mechanical properties across biological specimens or experimental runs. The resulting increase in accuracy, reproducibility, and measurement confidence strengthens interpretation of AFM-based bioengineering data.