On the density scaling of liquid dynamics

D. Fragiadakis, C. M. Roland
<span title="2011-01-28">2011</span> <i title="AIP Publishing"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/hnc5ddfunnd3taca63uf5ggldm" style="color: black;">Journal of Chemical Physics</a> </i> &nbsp;
Superpositioning of relaxation data as a function of the product variable TV^γ, where T is temperature, V the specific volume, and γ a material constant, is an experimental fact demonstrated for approximately 100 liquids and polymers. Such scaling behavior would result from the intermolecular potential having the form of an inverse power law (IPL), suggesting that an IPL is a good approximation for certain relaxation properties over the relevant range of intermolecular distances. However, the
more &raquo; ... rivation of the scaling property of an IPL liquid is based on reduced quantities, for example, the reduced relaxation time equal to T^1/2V^-1/3 times the actual relaxation time. The difference between scaling using reduced rather than unreduced units is negligible in the supercooled regime; however, at higher temperature the difference can be substantial, accounting for the purported breakdown of the scaling and giving rise to different values of the scaling exponent. Only the γ obtained using reduced quantities can be sensibly related to the intermolecular potential.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1063/1.3532545">doi:10.1063/1.3532545</a> <a target="_blank" rel="external noopener" href="https://www.ncbi.nlm.nih.gov/pubmed/21280745">pmid:21280745</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/vcuka2eb7zd4lafe3aqsdur2wi">fatcat:vcuka2eb7zd4lafe3aqsdur2wi</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20170225032644/http://www.dtic.mil/dtic/tr/fulltext/u2/a549978.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/63/61/6361884a46b3697fbfebd5178443a6794ff66be2.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1063/1.3532545"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> Publisher / doi.org </button> </a>