Bruker

+1 (800) 715-8440

Bruker AFM Probes Announcements » AFM Webinars and AFM Videos » High Speed Imaging while Heating and Cooling

High Speed Imaging while Heating and Cooling

Dynamic heating and cooling AFM measurements can be challenging because the temperature changes can induce considerable drift both in position, and force control. Linked here (http://www.youtube.com/user/BrukerNano) is a video showing a high speed imaging dynamic experiment from 60 C to -2 C. Tip scanning greatly simplifies the temperature control, while low system drift makes possible the stability. PeakForce Tapping (rather than tapping), which “re-zeros” the force every interaction, enables the continuous imaging over the entire temperature range.

The sample is Poly(diethylsiloxane) (PDES). Siloxanes have broad application as greases, lubricants, elastomers and resins. PDES is a liquid crystal at Room Temperature. When heated, PDES transitions into a fully liquid state at it’s isotropization temperature of ~ 60 C. Cooling back down, PDES undergoes two mesomorphic transitions:
Liquid — Liquid Crystal (mesomorphic), Liquid Crystal — Solid Crystal (~ -2 C).

AFM imaging can be used to study the film nano-morphology, and its changes at each phase transition.