Application of the thermal flash technique for low thermal diffusivity micro/nanofibers

Demko, Michael T.; Dai, Zhenting; Yan, Han; King, William P.; Cakmak, Miko; Abramson, Alexis R.
March 2009
Review of Scientific Instruments;Mar2009, Vol. 80 Issue 3, p036103
Academic Journal
The thermal flash method was developed to characterize the thermal diffusivity of micro/nanofibers without concern for thermal contact resistance, which is commonly a barrier to accurate thermal measurement of these materials. Within a scanning electron microscope, a micromanipulator supplies instantaneous heating to the micro/nanofiber, and the resulting transient thermal response is detected at a microfabricated silicon sensor. These data are used to determine thermal diffusivity. Glass fibers of diameter 15 μm had a measured diffusivity of 1.21×10-7 m2/s; polyimide fibers of diameters 570 and 271 nm exhibited diffusivities of 5.97×10-8 and 6.28×10-8 m2/s, respectively, which compare favorably with bulk values.


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