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Nanoceramics: strategy and applications1 Abdul-Majeed Azad, PhD

Summary: Nanoceramics: strategy and applications1
Abdul-Majeed Azad, PhD
Chemical Engineering Department
The University of Toledo, Toledo, OH, USA.
There is convincing theoretical and experimental evidence to suggest that fundamentally
new behavior in nanostructured materials is witnessed that otherwise cannot be
predicted by simple scaling laws. Nanodimensions provide a clear advantage over the
bulk, where the reduced dimensionality not only accentuates the functionality it also
does so in many instances, under less than theoretically required conditions. Hence,
there is a window of opportunity to develop nanoarchitectured ceramics for achieving
high performance devices.
High selectivity, enhanced sensitivity, short response time and long shelf-life are some
of the key features sought in the solid-state ceramic-based chemical sensors. Since the
sensing mechanism and catalytic activity are predominantly surface-dominated, benign
surface features in terms of small grain size, large surface area and high aspect ratio
and, open and connected porosity, are required to realize a successful material. In order
to incorporate these morphological features, a technique based on rigorous
thermodynamic consideration of the metal/metal oxide coexistence, was devised. By
modulating the oxygen partial pressure across the equilibrium M/MO proximity line,


Source: Azad, Abdul-Majeed - Department of Chemical and Environmental Engineering, University of Toledo


Collections: Materials Science; Energy Storage, Conversion and Utilization