Department of Chemical Engineering
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Magnet AC (MAC) mode (‘tapping’ mode) : The tip is driven at it’ resonance frequency by an electromagnet. In addition to topography the relative stiffness of the surface can be measured. Also, if the tip is chemically active then the strength of interaction between the surface and the active species on the tip can be measured.
Acoustic AC mode : similar to MAC mode, though the tip is driven at its resonance frequency by the Z-piezo.
Heating stage to 200 °C
Cooling (Pelitier) stage to -30 °C
A fluid cell for imaging under a range of liquids.
An EC cell for electrochemically controlled experiments.
In addition, we have built a temperature controlled pressure cell which is used for studying the inflation of nanometer thick polymer membranes.
The system also comes with an environmental chamber for studies under inert gas or controlled humidity conditions and a CleanLoad Glovebox for loading and unloading under clean room conditions. Finally, the scanner is mounted in a vibration isolation chamber to reduce ambient noise.
1. O’Connell P.A. and McKenna G.B. “Rheological Measurements of the Thermoviscoelastic Response of
Ultrathin Polymer Films”, Science, Vol. 307, No. 5716, 1760-1763 (2005).
2. S. A. Hutcheson and G. B. McKenna, “Nanosphere Embedding into Polymer Surfaces: A Viscoelastic
Contact Mechanics Analysis,” Physical Review Letters, 94, 076103 (2005).
The USPM AFM unit mainly consists of a microscope unit which is composed of the probe and scanner, an electronic interface unit (EIU) and a computer.
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