Critical behavior and the processing of nanoscale porous materials

Authors

  • Jens von Behren,

    1. Department of Electrical Engineering University of Rochester Rochester, NY 14627 (USA)
    2. Technische Universität München D-85747 Garching (Germany)
    Search for more papers by this author
  • Prof. Eldred H. Chimowitz,

    1. Department of Chemical Engineering University of Rochester Rochester, NY 14627 (USA)
    Search for more papers by this author
  • Prof. Philippe M. Fauchet

    1. Department of Electrical Engineering University of Rochester Rochester, NY 14627 (USA)
    2. Laboratory for Laser Energetics Department of Physics & Astronomy and Institute of Optics University of Rochester Rochester, NY 14627 (USA)
    Search for more papers by this author

  • The authors gratefully acknowledge support from the US army research office and the national science foundation science and technology center for photoinduced charge transfer (grant #CHE- 9120001). we thank Carl T. Lira, Karl D. Hirschman, William G. Herkstroeter, and Liz Jarrait for their technical and experimental assistance.

Abstract

Non-destructive drying of nanoscale porous materials is possible using supercritical fluids as drying agents. It is demonstrated that, for a successful outcome to the drying process. Maintaining supercritical conditions is of extreme importance, as illustrated by the Figure, which shows a porous silicon surface subcritically dried with CO2 – it is cracked and peeling. In contrast, the supercritically dried material remains homogeneous.

original image

Ancillary