|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Recent Developments in Biological, Structural and Functional Thin Films & Coatings
||Influence of Pressure and Temperature on Chromic Materials and their Technological Applications
||Airefetalo Sadoh, Nuggehalli M Ravindra
|On-Site Speaker (Planned)
Chromism is a color change phenomena experienced by certain materials referred to as chromic materials. These materials include, dyes conjugated conducting polymers, organic molecules etc. A related phenomena known as piezochromism can be investigated using both polymers and metals. This phenomenon is a color change in a solid specimen or sample solution induced by external pressures. This can be explained by the influence of pressure on the energy levels related to the highest occupied molecular orbital and or lowest unoccupied molecular orbital. Essentially, changes in the absorption and emission spectra of metal complexes in solution cause changes in solvent polarity at each pressure. Next, a gradual increase in the dielectric constant of the solvent with pressure then affects the energies of the HOMO and LUMO levels involved in the electronic transitions within the metal complexes, causing a corresponding color change. Color changes by pressure in organic polymeric materials are not a new concept but there is little literature on them. The main aim of this study is to investigate the color changes in polymers and how external stresses like pressure and temperature affect materials made out of these polymers.
||Planned: Supplemental Proceedings volume