Afm Buffer Calibration
Afm Buffer 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.
08:13
Buffers - Instructor Prep
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Preparation of SolutionsExpand Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed. To set up for this lab experiment, wear the appropriate personal protective equipment, including a lab coat, chemical splash goggles, and gloves. All solutions for this lab should be prepared in a chemical fume hood. Prepare 100 mL of a 1 M NaOH solution. Note:...
14:31
Buffers - Student Protocol
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Preparing 50 mM NaH2PO4 Buffer, pH 7Expand In the first part of this experiment, you will prepare a sodium phosphate solution buffered at pH 7.0. Monosodium phosphate is a weak acid with the conjugate base, disodium phosphate. Unadjusted monosodium phosphate solutions usually have a pH of about 4 - 6. Buffers are most effective close to their pKa, which is 6.8 to 7.2 for monosodium phosphate. So, you will use NaOH to push the...
02:56
Buffers
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2020
A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
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.
FAQs
Liquid changes the cantilever’s mechanical response compared with an unimmersed setting, so calibration must determine both deflection sensitivity and effective spring constant in the measurement solution. Accounting for damping and thermal fluctuations helps convert observed cantilever deflection into reliable nanoscale force values. This is especially important when comparing biochemical samples or repeating measurements over time.
Buffer composition, pH, ionic strength, temperature, and cleanliness all contribute to measurement quality. Controlling these conditions reduces signal drift and unwanted interactions between the probe and sample, while maintaining a consistent biochemical environment. Consistent conditions are particularly important when measurements involve hydrated materials whose structure or surface behavior may respond to the surrounding solution.
The supporting surface forms part of the measurement environment, so its properties must be considered alongside the cantilever and buffer. Surface-related effects can influence probe-sample interactions and the interpretation of topographic or force signals. Including the support in the calibration context helps distinguish features associated with the biological material from effects arising at the measurement interface.
A practical workflow begins by preparing the defined biochemical buffer and ensuring that the measurement environment is clean and stable. The cantilever is then immersed in the solution, where its deflection sensitivity and effective spring constant are determined under liquid conditions. Researchers also control pH, ionic strength, temperature, and surface conditions before collecting sample measurements.
This calibration is useful when researchers image or measure forces from proteins, membranes, nucleic acids, and other hydrated biological materials. It supports both topographic imaging and force spectroscopy, allowing nanoscale features and interactions to be evaluated in a defined solution. The approach is relevant when preserving a controlled biochemical environment is important for reproducible measurements.
Calibrated measurements provide more reliable nanoscale force and topographic signals by accounting for the liquid environment and controlling variables that promote drift or unwanted interactions. In biochemistry, this improves the reproducibility of imaging and force spectroscopy for biological materials. The resulting data can be interpreted with greater confidence because measurement conditions remain tied to the defined buffer system.