A state-of-the-art description of metastability observed in chalcogenide alloys is presented with the accent on the underlying physics. A comparison is made between sulphur(selenium)-based chalcogenide glasses, where numerous photo-induced phenomena take place entirely within the amorphous phase, and tellurides where a reversible crystal-to-amorphous phase-change transformation is a major effect. Applications of metastability in devices¿optical memories and nonvolatile electronic phase-change random-access memories among others are discussed, including the latest trends. Background material essential for understanding current research in the field is also provided.
The development of miniaturized systems for chemical and biochemical analysis has grown to the point where lab-on-a-chip devices are now important enabling tools in a diverse array of application areas. As the size of these systems continues to shrink, details of the micro- and nanoscale phenomena associated with their construction and operation must be considered. This book focuses on materials and engineering aspects of lab-on-a-chip devices and the application of microfluidics to materials synthesis. A microfabricated fluidic system integrating biological sample treatment and detection on a single chip offers the promise of low-cost, rapid and high-performance analysis. These devices can perform high-throughput biochemical assays for drug discovery and provide portability for point-of-care diagnostics and biothreat monitoring. Topics include: frontiers in lab-on-a-chip research; materials for lab-on-a-chip; materials synthesis on chip; cell manipulation and biomimetics on chip; porous materials in lab-on-a-chip; sensing and detection on chip - molecular level; sensing and detecting on chip - cells and particles; and sensing and detection on chip - DNA.