Stresses at the Interface of Mcro with Nano
Bicontinuous meso/macroporous materials with ordered tubular mesopores are inherently unstable with stresses built in at the interface of the nano/micro fractal dimensions. This is concluded by comparing the macroscopic dimensions and the unit cell size of native monoliths with those of monoliths stabilized against shrinkage by a conformal polymer coating on all macro- and mesoporous surfaces. The enhanced tendency for shrinking at the nanoscopic level is attributed to a syneresis-like mechanism where hydrogen bonding between hydroxyl groups in the concave internal surfaces of the tubular nanosized mesopores causes contraction.
N. Leventis et al., "Stresses at the Interface of Mcro with Nano," Journal of the American Chemical Society, American Chemical Society (ACS), Jan 2007.
The definitive version is available at http://dx.doi.org/10.1021/ja074010c
National Science Foundation (U.S.)
University of Missouri Research Board
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Article - Journal
© 2007 American Chemical Society (ACS), All rights reserved.