1. Porous and biphasic materials through solid state reactions
Daniel P. Shoemaker, Eric S. Toberer, and Ram Seshadri
Materials Department and Materials Research Laboratory,
University of California, Santa Barbara CA 93106, USA
We are investigating routes to porous and functional inorganic materials and bifunctional composites via solid-solid and solid-vapor reactions. By utilizing spontaneous, template-free processes, we are developing versatile, rapid routes to materials which are broadly applicable to filtration, catalysis, magnetic storage, and many other functional thrusts.
Zn2TiO4 or NiMn2O4
Reduction of ternary oxides in flowing 5% H2/N2 (red arrows) results in striking microstructures with many opportunities for functionality. When the oxygen sublattice is unchanged during the process (spinel to rocksalt), crystalline orientation is preserved and pores display aligned edges.
ZnMn2O4 films on MgAl2O4
(111)
(100)
700°C 8h
725°C 12h
700°C 2h
600°C 2h
600°C 2h
Anchored TiO2 dendrites
TiO2 nanorods
Ni particles on MnO
Epitaxial MnO: tailored pore size and orientation