by Staff Writers
Washington DC (SPX) May 19, 2015
Think about your favorite toys as a child. Did they light up or make funny noises when you touched them? Maybe they changed shape or texture. This week in ACS Central Science, researchers report a new material that combines many of these characteristics.
Beyond being fun, these materials, called organic "supercooled" liquids, may be useful for optical storage systems and biomedical sensors.
Some materials, like ordinary table salt, are crystals. When most crystals are heated up and then cooled again, they recrystallize. A few others don't quite snap back to their original well-ordered crystals when cooled but form amorphous supercooled liquids. For certain applications such as organic electronics and pharmaceutics, thermally stable amorphous organic materials are very important for device reliability and consistent efficacy.
To better understand these processes, Jinsang Kim and colleagues investigated how modifications of molecular structure can provide unique thermal stability to molten organic liquid in a wide temperature range.
The researchers studied a chemical called DPP, which has been widely used in dyes and organic electronics applications. They found that when two balanced intermolecular interaction forces implemented in DPP molecules are working toward opposite directions, the DPP remains in a uniquely stable supercooled liquid state.
Interestingly, a small "shear force" (getting rubbed) can break the force balance and induce rapid crystallization with a color change and bright "glow" under UV light. They say that their work has provided an understanding about molecular features that could be used to create thermally stable supercooled liquids.
To see the liquid in action, watch it on video here.
American Chemical Society
Space Technology News - Applications and Research
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.|