J-G Fan and Y-P Zhao 2008 Nanotechnology 19 155707 doi:10.1088/0957-4484/19/15/155707
J-G Fan and Y-P Zhao
Show affiliationsWhen a water droplet is dried on a vertically aligned Si nanorod array surface, the nanorods are bundled together. To understand how bundles are formed, a water droplet is frozen rapidly on a Si nanorod array surface observed under a cryo-SEM (scanning electron microscope). The nanorods in the precursor film form similar bundles as those dried in air. But the nanorods under the apparent frozen water droplet are only slightly deformed. We propose that the bundling of nanorods is caused by non-uniform water–nanorod interaction, which could happen either during the water spreading or drying process. Therefore, controlling the liquid–nanostructure interaction could minimize the bundling. In addition, the rapid freezing process does not preserve the water inside the nanochannels, and almost all the water forms ice on top of the nanorod surface, either as a planar interface or as particles, depending on the locations. The separated ice–nanorod interface will have potential applications in chemical separation and crystal growth.
64.70.D- Solid–liquid transitions
62.25.-g Mechanical properties of nanoscale systems
68.37.Hk Scanning electron microscopy (SEM) (including EBIC)
Soft matter, liquids and polymers
Surfaces, interfaces and thin films
Issue 15 (16 April 2008)
Received 3 October 2007, in final form 15 February 2008
Published 12 March 2008
J-G Fan and Y-P Zhao 2008 Nanotechnology 19 155707
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