Overney R.M. – TechConnect Briefs

Characterizing Membrane Sorption and Diffusion with Flux Lateral Force Microscopy

Killgore J.P., Overney R.M., University of Washington, US

Bulk permeability measurements provide an incomplete descriptor of permeability when considering heterogeneous or anisotropic membranes. Localized measurements of flux allow for independent assessment of constituent contributions to total permeability. Analogous to a puck on an [...]

Interfacial Nanocomposite Characterization by Nanoparticle Debonding

Killgore J.P., Overney R.M., University of Washington, US

A novel nanoscale thermomechanical methodology is introduced involving resistively heated cantilevers, also referred to as heated tip AFM (HT-AFM), that provide direct access to the interfacial interaction strength between poly(trimethyl silyl propyne) (PTMSP) - silica [...]

Use of Lateral Force Microscopy to Elucidate Cooperativity and Molecular Mobility in Amorphous Polymers and Self-Assembling Molecular Glasses

Knorr Jr. D.B., Killgore J.P., Gray T.O., Overney R.M., University of Washington, US

A novel scanning probe methodology based on lateral force microscopy is presented wherein kinetic friction measurements, obtained as a function of velocity for various temperatures, are used to deduce apparent Arrhenius-type activation energies for surface [...]

Understanding and utilizing molecular constraints in nanoscale material designs

Sills S., Overney R.M., Micron Technology, Inc., US

Challenges regarding nanoscale material designs often arise from the collision of two sets of critical length-scales; namely, device dimensions approach the length scale of molecular-level processes. On one hand, these finite size constraints cannot be [...]

Direct Observation of the Length of Molecular Cooperativity in Melts of Ultrathin Glass Formers

Overney R.M., Sills S., University of Washington, US

It is our great pleasure to submit this paper, which provides the long awaited microscopic real-space information about the glass transition process in polymers. In the light of the comments made by Nobel Laureate P.W. [...]