Visualizing single-molecule diffusion in mesoporous materials

Andreas Zürner, Johanna Kirstein, Markus Döblinger, Christoph Bräuchle () and Thomas Bein ()
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Andreas Zürner: University of Munich, Butenandtstrasse 5-13 (E), D-81377 Munich, Germany
Johanna Kirstein: University of Munich, Butenandtstrasse 5-13 (E), D-81377 Munich, Germany
Markus Döblinger: University of Munich, Butenandtstrasse 5-13 (E), D-81377 Munich, Germany
Christoph Bräuchle: University of Munich, Butenandtstrasse 5-13 (E), D-81377 Munich, Germany
Thomas Bein: University of Munich, Butenandtstrasse 5-13 (E), D-81377 Munich, Germany

Nature, 2007, vol. 450, issue 7170, 705-708

Abstract: Guest appearance Materials with mesoscale pores (that is, with diameters of several hundred nanometres) have many potential applications — including storage, separation and catalytic conversion — most of which depend on the diffusion of 'guest' molecules through the pores. Yet no method existed to correlate the guests' motion with the structure of the material. This looks set to change with the development of a technique combining electron microscopy with optical single-molecule tracking to visualize molecular diffusion in a mesoporous material. For the first time, guest molecules (dyes in this case) can be 'seen' changing speed or direction in response to structural features of the host on a nanometre scale. This opens the way to a deeper understanding of the properties of mesoporous solids.

Date: 2007
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DOI: 10.1038/nature06398

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