Decide which tip is better for polymeric films

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kefalonitis Posted: Wed, Nov 3 2010 10:58 AM

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Hello,

Before we order new tips, I try to decide which cantilever-tip would be the more 
efficient to deduce the topography of my surface at dry and liquid conditions.

My surface is a polymeric film Polybutadiene-Polyethylene oxide. Polymer chains 
conformation is expected to be brush or mushroom like and the chains be assembled in 
micelles.

In that architecture, Polybutadiene is most likely to be found away from the substrate 
that support the film while Polyethylene oxide likes more the substrate.

Micelle diameter calculations range from 5nm to 140nm.

What tip spring constant k (mN/m) and radius (nm) you think would fit better to study the 
topography as described above?