The laboratory includes a Bruker (formerly Anasys Instruments) NanoIR3 instrument. This technique combines atomic force microscopy with infrared laser detection to allow for chemical mapping of surfaces at the nanometer scale. The operating principle is that a rapidly pulsed laser is focused on the surface of the sample causing an abrupt thermal expansion which causes the AFM cantilever to oscillate proportionally to the ir absorption of the sample.

Measuring the AFM cantilever oscillation amplitude as a function of wavelength (or wavenumber) results in a local absorption spectrum with nanoscale spatial resolution. The system is equipped two mid-infrared light sources a QCL laser and a fast OPO laser as well as a flow cell for studies of surfaces in liquids. This system can be used for mapping chemical changes on the surfaces of materials, including rock samples from the subsurface to study the effects of water injection (e.g. produced water) and carbon storage.



Karen Louise Feilberg
Center for Olie og Gas - DTU
93 51 14 20