The SFA 2000 combined with the FECO (Fringes of Equal Chromatic Order) multiple-beam interferometry technique measures forces (static- equilibrium or dynamic- non-equilibrium) between two surfaces in vapors or liquids with a sensitivity of a few nN and a distance resolution of 1Å (0.1 nm).
The figures show the SFA2000 (a) Basic Unit with optional attachments and (b) a schematic figure shows a section through the center of the apparatus. Four different distance control mechanisms are shown: coarse micrometer, medium micrometer, fine micrometer and extra-fine (piezoelectric tube) control.
The system utilizes a ‘universal disk mount’ for both the upper and lower disks. These new disks supports can accommodate both cylindrical disks and a new type of rectangular dove-tailed disk, shown here (schematic figure). The dove-tail disks can be mounted in the SFA 2000 with the main chamber filled with solution, making them ideal for the transfer of surfactant / lipid bilayer, polymer- or protein-coated surfaces into the apparatus without exposure to air.