RT Journal Article T1 Frame-invariant Fick diffusion matrices of multicomponent fluid mixtures A1 Ortiz De Zárate Leira, José María A1 Sengers, Jan V. AB Extension of a description of mass diffusion in binary fluids based on Fick's law to multicomponent fluids requires introduction of diffusion matrices. A problem is that Fick diffusion matrices commonly adopted for multicomponent fluids depend on the velocity frame of reference. In this paper we show how one can define Fick diffusion matrices for multicomponent fluids that are frame invariant. PB Royal Society of Chemistry SN 1463-9076 YR 2020 FD 2020-08-21 LK https://hdl.handle.net/20.500.14352/6519 UL https://hdl.handle.net/20.500.14352/6519 LA eng NO We thank Aliaksandr Mialdun from the Universite Libre de Bruxelles for a careful review of the manuscript. We also thank Dick Bedeaux of the Norwegian University of Science and Technology in Trondheim for valuable discussions. We acknowledge support from the European Space Agency (ESA) through the TechNEs MAP project. The research at the Complutense University was further supported by grant ESP2017-83544-C3-2-P of the Spanish Agencia Estatal de Investigación. NO Ministerio de Ciencia e Innovación (MICINN) NO European Space Agency (ESA) through the TechNEs MAP project DS Docta Complutense RD 20 mar 2026