(Sensors, Materials for Advanced Research in Renewable-energy and Technology)
Stability and dynamics of thin (<100 nm) viscoelastic films have been studied extensively in recent times because of their importance in various products and processes such as coatings, adhesives, microfluidic devices and membranes. They also appear as the lining of mammalian lungs, as the tear film of the cornea and in the contact region of the cell-cell or cell-substrate adhesion. Recent studies on thin bilayers have shown a richer variety of instability and dewetting pathways that are of potential use in mesoscale patterning of polymers for optoelectronic, micro-electromechanical systems, and sensor applications. Experiments involving the instabilities of thin bilayers on patterned substrate are found to be extremely useful in generating large area patterns. Polymer bilayers also serve as simple hydrodynamic models for the adhesion of biological membranes to solids in the presence of a surrounding liquid. Thus, we are investigating the instability and dynamics thin single and multiple layers on plane, rough and porous surfaces under the influence of gravitational field, intermolecular forces as well as external electric or magnetic fields.