by Staff Writers
Brussels, Belgium (SPX) Sep 04, 2017
Molecules move faster as they get closer to adhesive surfaces, but this effect is not permanent. Such is the puzzling conclusion of a study published in Physical Review Letters, carried out by Simone Napolitano and his colleagues in the Laboratory of Polymers and Soft Matter Dynamics at the Universite libre de Bruxelles.
Since more than 20 years, several researchers have been studying the behaviour of certain polymers, biomolecules, and liquid crystals at the nano-scale near an absorbing medium. In this case we would expect slower movement rates, but the experiments showed the opposite: molecules move faster as they get closer to an adhesive surface.
According to the research team of ULB, this odd movement is due to a phenomenon known as the 'nanoconfinement effect': the molecules that are in direct contact with the adhesive surface do move slower, or even not at all, but this in turn increases the movement rate of the next molecules, as they have more free space around them.
Now, writing in PRL, Napolitano and coworkers show that this effect is only temporary: movement rate gradually slows down as new molecules adhere to the surface and fill in the spaces left.
After a while, molecules move as if they were far from the adhesive surface. Importantly, the time necessary to return to normal molecular movement rate is longer than what would be predicted by any current theory of polymer physics.
As a result, the researchers propose that the amount of available space at the interface between polymer and sticky wall is an important parameter to control the behaviour of nanomaterials.
Sharjah UAE (SPX) Aug 30, 2017
India is a second largest producer of leather, and being so, leather production and dyeing significantly contribute to pollution of water resources in India. Consistent dyeing of leather is difficult due to the unique nature of the raw material (matrix of collagen fibers), thus leather dyeing and finishing involves numerous wet chemical treatments having huge environmental impacts. Conside ... read more
Universite libre de Bruxelles
Space Technology News - Applications and Research
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - 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. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. 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|