Mechanochemistry: Fundamentals, applications and future

Elucidating the compression mechanism of compressible liquids Siyuan Liu 1 , Tristan Youngs 2 and Beibei Lai 3 1 School of Chemistry and Chemical Engineering, Queen’s University Belfast, UK, 2 ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, UK, 3 School of Chemistry and Chemical Engineering, Queen’s University Belfast, UK The compression of a substance in response to applied pressure is one of its most fundamental mechanical properties. Whilst gases are, of course, highly compressible, liquids are effectively incompressible because they are condensed phases with no appreciable porosity. Therefore, to make a liquid compressible, empty spaces must first be generated within it. One strategy to achieve this is to disperse small porous particles into a liquid, such that the pores of the particles are initially empty but become filled with the liquid molecules when pressure is applied. Herein, ZIF-8 particles dispersed in water (ZIF-8@water) has been designed to form such a compressible liquid system. To investigate the mechanism of the compression process at the molecular level, total neutron scattering has been used. In this project, the code “Dissolve” 1 has been used to analyze neutron scattering data. Analysis of neutron scattering data helps to reveal the incursion of water into the framework as pressure is increased. References 1. Youngs, T., 2019. Dissolve: next generation software for the interrogation of total scattering data by empirical potential generation. Molecular Physics, 117(22), pp.3464-3477.

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