{"id":3824,"date":"2022-09-21T11:11:28","date_gmt":"2022-09-21T09:11:28","guid":{"rendered":"https:\/\/www.cerege.fr\/?page_id=3824"},"modified":"2023-01-18T17:56:29","modified_gmt":"2023-01-18T16:56:29","slug":"reactivite-des-phases-nanometriques","status":"publish","type":"page","link":"https:\/\/www.cerege.fr\/fr\/sciences\/environnement-durable\/reactivite-des-phases-nanometriques\/","title":{"rendered":"R\u00e9activit\u00e9 des phases Nanom\u00e9triques"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"3824\" class=\"elementor elementor-3824\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-81e378d elementor-section-full_width elementor-section-height-min-height elementor-section-height-default elementor-section-items-middle\" data-id=\"81e378d\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6330361d\" data-id=\"6330361d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7e130cd5 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7e130cd5\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1ce41bb0\" data-id=\"1ce41bb0\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-75b09a86 elementor-widget elementor-widget-shortcode\" data-id=\"75b09a86\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\"><nav aria-label=\"breadcrumbs\">\n            <div class=\"breadcrumb-container theme1\">\n                <ol>\n                                    <\/ol>\n            <\/div>\n        <\/nav>    <script type=\"application\/ld+json\">\n        {\n            \"@context\": \"http:\/\/schema.org\",\n            \"@type\": \"BreadcrumbList\",\n            \"itemListElement\": [\n                            ]\n        }\n    <\/script>\n   \n    <script>\n            <\/script>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-a307583 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a307583\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-c6ae150\" data-id=\"c6ae150\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1033b3c elementor-widget elementor-widget-text-editor\" data-id=\"1033b3c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Les propri\u00e9t\u00e9s physiques et chimiques des nanophases naturelles et manufactur\u00e9es sont diff\u00e9rentes de celles de phases min\u00e9rales de m\u00eame composition chimique mais de plus grande taille. Ces propri\u00e9t\u00e9s, en particulier une r\u00e9activit\u00e9 accrue sp\u00e9cifique \u00e0 leur \u00e9tat nanoparticulaire, impliquent des comportements in\u00e9dits dans l\u2019environnement auxquels l\u2019\u00e9quipe s\u2019int\u00e9resse (e.g. transfert en milieux poreux, stabilisation des compos\u00e9s organiques des sols, adsorption de polluants).<br \/><br \/><\/p><h2><span style=\"font-weight: normal;\">De l\u2019ion \u00e0 la particule : <br \/>dynamique aux interfaces<\/span><\/h2><p>Les modifications structurales des nanoparticules de petites tailles peuvent modifier leur solubilit\u00e9 ou cin\u00e9tique de dissolution. Des processus dynamiques mettent en jeu des \u00e9changes entre les esp\u00e8ces dissoutes et les atomes de c\u0153ur via des ph\u00e9nom\u00e8nes de diffusion atomique. La fronti\u00e8re entre nano-phases cristallines, amorphes, structures polym\u00e9talliques devient floue.<\/p><p>Nous cherchons \u00e0 relier la stabilit\u00e9 et la r\u00e9activit\u00e9 des nanoparticules avec leurs propri\u00e9t\u00e9s structurales. Nous focalisons nos efforts sur des particules de tailles nanom\u00e9triques (\u00e0 partir desquelles de nouvelles propri\u00e9t\u00e9s apparaissent &lt;10-20 nm) jusqu\u2019aux clusters atomiques de 3 \u00e0 une dizaine d\u2019atomes aux propri\u00e9t\u00e9s encore peu explor\u00e9es.<\/p><p>Un des objectifs est de caract\u00e9riser la stabilit\u00e9 chimique (dissolution) et les propri\u00e9t\u00e9s (optique, \u00e9lectrique, catalytique) de ces clusters associ\u00e9s \u00e0 diff\u00e9rentes surfaces min\u00e9rales et dans des milieux confin\u00e9s.<br \/><br \/><\/p><h2><span style=\"font-weight: normal;\">Transferts des collo\u00efdes et des m\u00e9taux<\/span><\/h2><p>Les m\u00e9canismes r\u00e9actionnels \u00e0 l\u2019\u00e9chelle nanom\u00e9trique sont appr\u00e9hend\u00e9s afin de mieux comprendre le devenir de nutriments et de contaminants dans les compartiments aqueux naturels (eau de surface, sol, s\u00e9diments\u2026) ou anthropiques (fili\u00e8re traitement de l\u2019eau).<\/p><p>Des approches m\u00e9canistiques et holistiques sont mises en \u0153uvre, couplant \u00e0 la fois exp\u00e9riences en laboratoire, terrain et mod\u00e9lisation, qui permettent d\u2019aborder les transferts d\u2019\u00e9chelle et de complexit\u00e9 n\u00e9cessaires. Notamment, la probl\u00e9matique du transfert de polluants via les eaux de surface, les sols ou les berges, depuis la source de d\u00e9versement (cycle de vie des produits) vers la ressource en eau (usages de l\u2019eau) est un objet d\u2019\u00e9tude prioritaire. Le r\u00f4le des collo\u00efdes dans les processus d\u2019att\u00e9nuation naturelle est \u00e9tudi\u00e9 et des solutions de rem\u00e9diation inspir\u00e9es par la nature sont envisag\u00e9e dans une logique de recyclage de l\u2019eau us\u00e9e.<br \/><br \/><\/p><h2><span style=\"font-weight: normal;\">Interactions organo-min\u00e9rales<\/span><\/h2><p>Les interactions organo-min\u00e9rales contr\u00f4lent la dynamique des MO dans les syst\u00e8mes naturels de surface, en particulier dans les sols. L\u2019\u00e9quipe s\u2019int\u00e9resse au r\u00f4le des nanomin\u00e9raux dans la stabilisation des compos\u00e9s organiques vis-\u00e0-vis de la d\u00e9gradation microbienne et r\u00e9ciproquement \u00e0 l\u2019inhibition de la croissance des min\u00e9raux secondaires par ces compos\u00e9s organiques.<\/p><p>Les interactions \u00e0 l\u2019\u00e9chelle mol\u00e9culaire et les propri\u00e9t\u00e9s des nano-compos\u00e9s organo-min\u00e9raux sont \u00e9tudi\u00e9es afin de comprendre les facteurs contr\u00f4lant la d\u00e9stabilisation des complexes organo-min\u00e9raux. L\u2019approche couple des travaux sur des analogues et des \u00e9chantillons extraits de sols naturels. Des techniques adapt\u00e9es de s\u00e9parations, de quantification des MO et de leur dynamique (<sup>13<\/sup>C,\u00a0<sup>14<\/sup>C) et de caract\u00e9risation structurale des organo-min\u00e9raux \u00e0 la nano\u00e9chelle (nanoSIMS, MEB et MET, nanoCT, synchrotrons) sont mises en \u0153uvre.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-ef3e798\" data-id=\"ef3e798\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c8b4622 gallery-spacing-custom elementor-widget elementor-widget-image-gallery\" data-id=\"c8b4622\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image-gallery.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div 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src=\"https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/particule_minerale_en_suspension_Rhone-1024x709.png\" class=\"attachment-large size-large\" alt=\"\" srcset=\"https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/particule_minerale_en_suspension_Rhone-1024x709.png 1024w, https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/particule_minerale_en_suspension_Rhone-300x208.png 300w, https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/particule_minerale_en_suspension_Rhone-768x532.png 768w, https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/particule_minerale_en_suspension_Rhone-18x12.png 18w, https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/particule_minerale_en_suspension_Rhone.png 1300w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"c8b4622\" data-elementor-lightbox-title=\"NanoZnS\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6NDAxNywidXJsIjoiaHR0cHM6XC9cL3d3dy5jZXJlZ2UuZnJcL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjJcLzA5XC9OYW5vWm5TLnBuZyIsInNsaWRlc2hvdyI6ImM4YjQ2MjIifQ%3D%3D\" href='https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/NanoZnS.png'><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"554\" src=\"https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/NanoZnS-1024x709.png\" class=\"attachment-large size-large\" alt=\"\" srcset=\"https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/NanoZnS-1024x709.png 1024w, https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/NanoZnS-300x208.png 300w, https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/NanoZnS-768x532.png 768w, https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/NanoZnS-18x12.png 18w, https:\/\/www.cerege.fr\/wp-content\/uploads\/2022\/09\/NanoZnS.png 1300w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a>\n\t\t\t<\/div><\/figure>\n\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b38c346 elementor-widget elementor-widget-text-editor\" data-id=\"b38c346\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 style=\"padding-left: 40px;\"><span style=\"font-weight: normal;\"><span style=\"color: #0f72bb;\">Projets en cours<\/span><\/span><\/h3><ul><li>2022-2025: <strong>Projet ANR SURFMEMO.\u00a0<\/strong><em>Mineral Surfaces: Origin and archive of biological information.<\/em><\/li><li>2022-2025 : <strong>Programme national ANSES 2021-EST-126 FILTRE-UV.\u00a0<\/strong><em><em><em>Emission, devenir et effets environnementaux des filtres UV issus de cr\u00e8mes solaires \u2013 Avantages et risques des substances chimiques ou nanoparticulaires.<\/em><\/em><\/em><\/li><li>2022-2023 : <strong>Projet F\u00e9d\u00e9. Rech. ECCOREV\/Institut ITEM &#8211; AGREDYN.\u00a0<\/strong><em>R\u00f4le de la structure d\u2019agr\u00e9gats dans les dynamiques d\u2019adsorption\/d\u00e9sorption des contaminants<\/em>.<\/li><li>2020-2023 : <strong>Programme national Carnot Eau et Environnement NEREIDE.\u00a0<\/strong><em><em><em>Solutions bas\u00e9es sur la Nature pour l\u2019Epuration et la R\u00e9utilisation d\u2019Eau us\u00e9e vers une Irrigation DuablE.<\/em><\/em><\/em><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Les propri\u00e9t\u00e9s physiques et chimiques des nanophases naturelles et manufactur\u00e9es sont diff\u00e9rentes de celles de phases min\u00e9rales de m\u00eame composition chimique mais de plus grande taille. Ces propri\u00e9t\u00e9s, en particulier [&hellip;]<\/p>\n","protected":false},"author":551,"featured_media":8431,"parent":829,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-3824","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"publishpress_future_action":{"enabled":false,"date":"2026-05-09 20:25:46","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/pages\/3824","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/users\/551"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/comments?post=3824"}],"version-history":[{"count":5,"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/pages\/3824\/revisions"}],"predecessor-version":[{"id":15891,"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/pages\/3824\/revisions\/15891"}],"up":[{"embeddable":true,"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/pages\/829"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/media\/8431"}],"wp:attachment":[{"href":"https:\/\/www.cerege.fr\/fr\/wp-json\/wp\/v2\/media?parent=3824"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}