Nanoengineering of Crystal and Amorphous Surfaces of Pharmaceutical Particles for Biomedical Applications

The morphology, size, and surface properties of pharmaceutical particles form an essential role in the therapeutic performance of active pharmaceutical ingredients (APIs) and excipients as constituents in various drug delivery systems and clinical applications. Recent advances in methods for surface modification, however, rely heavily on...

Autonomous high-temperature healing of surface cracks in Al₂O₃ containing Ti₂AlC particles

In this work, the oxidation-induced crack healing of Al₂O₃ containing 20 vol.% of Ti₂AlC MAX phase inclusions as healing particles was studied. The oxidation kinetics of the Ti₂AlC particles having an average diameter of about 10 μm was studied via thermogravimetry and/or differential thermal...

Self-healing and high-temperature oxidation of nano-Ni dispersed Al2O3 hybrid materials

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Fabrication of in situ ultrathin anodic aluminum oxide layers for nanostructuring on silicon substrate

The authors demonstrate a method for the fabrication of in situ ultrathin porous anodic aluminum oxide layers (aspect ratio<2:1) on Si, which can be directly used as templates for nanodot preparation and for pattern transfer. The regular shape of the aluminum oxide pores is maintained even when the thickness of the aluminum oxide template is...

Promoting a-Al2O3 layer growth upon high temperature oxidation of NiCoCrAlY alloys

The turbine blades in gas turbine engines need to be protected against high temperature oxidation and corrosion with a coating system. This coating system comprises of a Ni-based superalloy substrate, a NiCoCrAlY bond coating (BC) and an insulating ceramic thermal barrier coating (TBC). Good protection is offered when during service of the...

Influence of the gate dielectric on the mobility of rubrene single-crystal field-effect transistors

We have performed a comparative study of rubrene single-crystal field-effect transistors fabricated using different materials as gate insulator. For all materials, highly reproducible device characteristics are obtained. The achieved reproducibility permits one to observe that the mobility of the charge carriers systematically decreases with...