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At (1) a large surface stress change is measured.
How can large surface stress signals be achieved?
Chloride ions can freely interact with the whole surface and large surface stress changes are measured.
First, we will discuss what is required to achieve a large surface stress signal to improve sensitivity.
On a clean gold coated surface, a large number of ions can interact with the surface resulting in a large surface stress change signal.
The blue trace shows the response of a clean gold evaporated surface measuring a large surface stress change of σ = 350 mN/m.
Similar(54)
This behaviour could be due to the relief of large tensile surface stress in the unreconstructed surface.
Changing the presence of any ionic or charged species near the surface leads to a large change of surface stress.
Covering the surface complete densely with a monolayer of molecules will hinder the ions to reach the surface and no large change in surface stress is observed.
The fatigue limit decreased when precracks were generated on the surface, in spite of a large surface compressive residual stress in the case of 0.5% carbon steel.
Our approach to increasing the dynamic range of the stress signal is to drive the adsorption and desorption of ions to the cantilever surface, thus inducing a large measurable and characteristic surface stress change [15].
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com