BEGIN:VCALENDAR VERSION:2.0 PRODID:www.dresden-science-calendar.de METHOD:PUBLISH CALSCALE:GREGORIAN X-MICROSOFT-CALSCALE:GREGORIAN X-WR-TIMEZONE:Europe/Berlin BEGIN:VTIMEZONE TZID:Europe/Berlin X-LIC-LOCATION:Europe/Berlin BEGIN:DAYLIGHT TZNAME:CEST TZOFFSETFROM:+0100 TZOFFSETTO:+0200 DTSTART:19810329T030000 RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=3;BYDAY=-1SU END:DAYLIGHT BEGIN:STANDARD TZNAME:CET TZOFFSETFROM:+0200 TZOFFSETTO:+0100 DTSTART:19961027T030000 RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=10;BYDAY=-1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:DSC-20406 DTSTART;TZID=Europe/Berlin:20240124T140000 SEQUENCE:1706078405 TRANSP:OPAQUE DTEND;TZID=Europe/Berlin:20240124T153000 URL:https://www.dresden-science-calendar.de/calendar/en/detail/20406 LOCATION:HZDR\, Bautzner Landstraße 40001328 Dresden SUMMARY:Tournassat: FWO-Institutskolloquium: „Electrostatic interactions at clay mineral surfaces: At the crossroads between mineralogy\, geochemis try\, and geophysics“ CLASS:PUBLIC DESCRIPTION:Speaker: Christophe Tournassat\nInstitute of Speaker: Professor at the University of Orléans\, France\nTopics:\n\n Location:\n Name: HZ DR (L9.3/216 - Bibliothek)\n Street: Bautzner Landstraße 400\n City: 01 328 Dresden\n Phone: \n Fax: \nDescription: Electrostatic interactions a t clay mineral surfaces: At the crossroads between mineralogy\, geochemist ry\, and geophysics Christophe Tournassat (ISTO\, University of Orléans\, France\; EESA\, Lawrence Berkeley National Laboratory\, USA) Clayey mate rials properties are key elements in several important subsurface energy-r elated applications\, including the long-term disposal of nuclear wastes i n geological repositories and the storage of CO2 in subsurface geological formations. Clayey materials show a remarkable array of desirable macro-sc ale properties such as very low permeability\, strong adsorption\, semi-pe rmeable membrane properties\, and high swelling pressure\, which lead to s low advective transport rates\, contaminant retardation\, limited diffusio n for anions\, and self-sealing of fractures. These properties arise from the interactions of charged mineral surfaces with water and solutes presen t in the nanopores of these materials\, among which electrostatic interact ions often play a dominant role. The study of interactions between water molecules\, ions\, and individual clay mineral surfaces remains an intense field of research\, providing a basic understanding to build predictive m odels for the simulation of clayey material behavior as a function of phys ical and chemical forcing. However\, the behavior of nanoporous clay envir onments is complicated by the fact that the pore structure of clay materia ls\, but also the surfaces and compositions of clay minerals\, are heterog eneous\, and that water and ions can be present in bulk water\, incorporat ed within interlayer spaces\, adsorbed to external surfaces\, whether at b asal or edge surfaces\, or located within the electrical double layer. Mut ual interactions between these system components lead to highly coupled pr ocesses and these couplings manifest themselves in macroscopic observation s up to geological formation scale\, such as geologic ultrafiltration\, i. e. the accumulation of solutes on the inflow side of clay-rich lithologies . To understand and predict the coupling phenomena\, a preferred approach is usually built on the following sequence: i) to examine the physical pr ocesses at the molecular and pore scale\, ii) to up-scale the physical law s toward the continuum scale\, and iii) to compare continuum scale model p redictions to geophysical and geochemical observables. My talk will addres s some of the challenges related to this type of upscaling strategy focusi ng on the role of electrostatic interactions on clay minerals properties. DTSTAMP:20260611T212727Z CREATED:20231222T063815Z LAST-MODIFIED:20240124T064005Z END:VEVENT END:VCALENDAR