Princeton University

David L Milius

Ilhan A Aksay

Robert K Prud'homme

Sibel Korkut

John S Lettow

James S Vartuli

Edward P Vicenzi

Wan Y Shih

Wei H Shih

Xiaoping Li

Functionalized graphene sheets having a carbon to oxygen molar ratio of at least about 23:1 and method of preparing the same.

Functionalized graphene sheets having high carbon to oxygen ratios

A modification of the traditional unimorph flextensional actuator is provided by replacing the metal shim with an electrically conducting oxide. Comprised of lead zirconate titanate and zinc oxide that is co-sintered, the laminate composite obtains large axial displacements while maintaining moderate axial loads. The varistor properties of zinc oxide dictate that the conductance increases several orders of magnitude when a critical electric field is applied. The versatility of the processing over other actuator system facilitates miniaturization, while maintaining comparable performance characteristics. Functional gradients in the material properties are created in the green body by layering thin tape cast sheets. The unique PZT-zinc oxide composite not only controls the piezoelectric gradient, but permits control of the sintering kinetics leading to the processing of either flat or highly domed structures.

Multilayer ceramic piezoelectric laminates with zinc oxide conductors

A bulk high temperature superconductor single crystal having the formula MBa.sub.2 Cu.sub.3 O.sub.7-x wherein M is selected from the group consisting of Y, Sm, Eu, Gd, Dy, Ho, Er, and Yb; and, x has a number value from about 0.1 to about 1.0; are produced by a novel process incorporating: i) starting powders produced by combustion spray pyrolysis, ii) a novel setter powder, and/or iii) a monitored isothermal growth process.

Method for producing ceramic superconductor single crystals

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Princeton, NJ, United States of America

David L Milius