Langmuir Balances

on-site preparation and characterisation

Free floating polymer films on water are precursor to functional polymer brushes at solid-liquid interface.

Left: Preparation and manipulation of free floating films on water surface (Langmuir trough), i.e. reducing molecular area to achieve desired packing density (state), A -> B

Middle: Tansfer of polymer films from water surface onto pre-coated silicon blocks via Langmuir-Schaefer technique.

Right: Characterisation of such-formed responsive polymer brushes at solid-liquid interface by neutron reflectivity. In-situ exchange of counter ions causes fully reversible structural changes of polymer brush.