Surface force apparatus for nanorheology under large shear strain.

A surface force apparatus for nanorheology under large shear strain

A surface force apparatus for nanorheology under large shear strain

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Nanorheology of Confined Polymer Melts. 2. Nonlinear Shear Response at Strongly Adsorbing Surfaces

The large-amplitude nonlinear shear rheology of polymer melts confined between strongly adsorbing surfaces (parallel plates of mica) was studied as a function of strain, frequency, and thickness of the polymer films. The shear strains varied from less than 0.1 (linear response) to over 30 (at which the film structure was strongly modified by the imposed shear). The measurements employed a surfa...

Exploring the “friction modifier” phenomenon: nanorheology of n-alkane chains with polar terminus dissolved in n-alkane solvent

Dilute solutions of two polar end-functionalized linear alkanes (1-hexadecylamine and palmitic acid), each dissolved in tetradecane, were confined between two mica surfaces and investigated using a surface forces apparatus modified to study shear nanorheology. These two solutions showed similar nanorheological properties that differed from those observed for pure n-alkanes. In static measuremen...

Dynamics of nonlinear rectangular plates subjected to an orbiting mass based on shear deformation plate theory

In this paper, transverse and longitudinal vibration of nonlinear plate under exciting of orbiting mass is considered based on first-order shear deformation theory. The nonlinear governing equation of motion are discretized by the finite element method in combination with Newmark’s time integration scheme under von Karman strain-displacement assumptions. For validation of method and formulation...