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New Constant Diameter NeedleProbes™ with Unique Ability to Measure Liquid Surface Properties by AFM
Date:12/15/2009

Constant diameter NeedleProbes™ for Atomic Force Microscopy (AFM) have been developed and are opening up a new area of research for studies at the liquid/air interface. The NeedleProbes’ cylindrical geometry enables researchers to measure surface tension, contact angle, meniscus height, evaporation rate and viscosity - all in a single force distance curve.

(PRWEB) December 15, 2009 -- New, constant diameter NeedleProbes are enabling unique measurements at the liquid/air interface. These NeedleProbes’ cylindrical geometry enables a new area of research for liquid studies. “AFM can now be used to measure surface tension, contact angle, meniscus height, evaporation rate and viscosity - all in a single force distance curve” says Mehdi Yazdanpanah, inventor of the NeedleProbes. The new metallic probes have recently been introduced for a variety of applications, many of which had been impractical for AFM.

Atomic force microscopy routinely takes advantage of force-distance curves to measure interactions between an AFM tip and a sample surface. An example would be extending the tip to a liquid surface so the wetting force can be measured. Although standard probes can detect wetting force, surface tension and contact angle are very complicated to determine. Imprecise knowledge of the length of contact and angle of the meniscus with the sides of the tip make such measurements impractical using standard AFM probes. Furthermore, with increasing insertion depth, the attractive force of standard tips continues to grow as the contact line increases. The large force can eventually overcome the cantilever and result in the unintended immersion of the cantilever into the liq
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