Thermal transpiration in zeolites: A mechanism for motionless gas pumps

Gupta, Naveen K.; Gianchandani, Yogesh B.
November 2008
Applied Physics Letters;11/10/2008, Vol. 93 Issue 19, p193511
Academic Journal
We explore the use of a naturally occurring zeolite, clinoptilolite, for a chip-scale, thermal transpiration-based gas pump. The nanopores in clinoptilolite enable the required free-molecular flow, even at atmospheric pressure. The pump utilizes a foil heater located between zeolite disks in a plastic package. A 2.3 mm thick zeolite disk generates a typical gas flow rate of 6.6×10-3 cc/min-cm2 with an input power of <300 mW/cm2. The performance is constrained by imperfections in clinoptilolite, which provide estimated leakage apertures of 10.2–13.5 μm/cm2 of flow cross section. The transient response of the pump is studied to quantify nonidealities.


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