{"id":52347,"date":"2022-04-28T12:04:40","date_gmt":"2022-04-28T10:04:40","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=52347"},"modified":"2022-11-24T15:12:48","modified_gmt":"2022-11-24T13:12:48","slug":"these-de-thuy-quynh-duong-va-soutenir-sa-these-de-doctorat-intitulee-calcul-des-resistances-thermiques-dinterface-par-dynamique-moleculaire-ab-initio","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/actualites\/these-de-thuy-quynh-duong-va-soutenir-sa-these-de-doctorat-intitulee-calcul-des-resistances-thermiques-dinterface-par-dynamique-moleculaire-ab-initio.html","title":{"rendered":"Th\u00e8se de Thuy-Quynh DUONG : \u00ab\u00a0Calcul des r\u00e9sistances thermiques d\u2019interface par dynamique mol\u00e9culaire ab initio\u00a0\u00bb"},"content":{"rendered":"<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-v8r3a3-54dd2db54206702a1ef83a4af0ce8f3c\">\n.flex_column.av-v8r3a3-54dd2db54206702a1ef83a4af0ce8f3c{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-v8r3a3-54dd2db54206702a1ef83a4af0ce8f3c av_one_full  avia-builder-el-0  avia-builder-el-no-sibling  first flex_column_div av-zero-column-padding'     ><section  class='av_textblock_section av-l2iu886u-0ea7b87d7337381bdda2f0c192e6a80d'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h3 style=\"text-align: center;\">Th\u00e8se de Thuy-Quynh DUONG<\/h3>\n<h4 style=\"text-align: center;\">\u00ab\u00a0Calcul des r\u00e9sistances thermiques d\u2019interface par dynamique mol\u00e9culaire ab initio\u00a0\u00bb<\/h4>\n<blockquote>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_font_icon-75acef453ae55ba5c8e347ae6517e93b\">\n.av_font_icon.av-av_font_icon-75acef453ae55ba5c8e347ae6517e93b .av-icon-char{\nfont-size:30px;\nline-height:30px;\n}\n<\/style>\n<span  class='av_font_icon av-av_font_icon-75acef453ae55ba5c8e347ae6517e93b avia_animate_when_visible av-icon-style- avia-icon-pos-left av-no-color avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue8c9' data-av_iconfont='entypo-fontello' ><\/span><\/span>\n<p>Soutenance le jeudi 5 mai, \u00e0 10h00<br \/>\nAmphitheater of the IEMN - Central Laboratory - Villeneuve d'Ascq<\/p>\n<\/blockquote>\n<h5>Jury :<\/h5>\n<p>B\u00e9atrice Dagens, Directrice de recherche, Universit\u00e9 Paris Sud, Rapporteur<br \/>\nFadi Baida, Professeur, Universit\u00e9 de Franche-Comt\u00e9, Besan\u00e7on, Rapporteur<br \/>\nJo\u00ebl Charrier, Ma\u00eetre de conf\u00e9rences, Universit\u00e9 de Rennes, Examinateur<br \/>\nJean Michel Raquez, Ma\u00eetre de recherche, Universit\u00e9 de Mons, Belgique, Examinateur<br \/>\nSt\u00e9phane Giraud, Ma\u00eetre de conf\u00e9rences, Universit\u00e9 de Lille, France, Examinateur<br \/>\nVal\u00e9rie Gaucher, Professeure, Universit\u00e9 de Lille, Examinateur<br \/>\nMich\u00e8le Carette, Ma\u00eetresse de conf\u00e9rences, Universit\u00e9 de Lille, Lille, Co-encadrante<\/p>\n<p><strong>Directeurs de th\u00e8se :<\/strong><br \/>\nYan Pennec, Professeur, Universit\u00e9 de Lille<br \/>\nVincent Thomy, Professeur, Universit\u00e9 de Lille<\/p>\n<h5>Summary:<\/h5>\n<p>Les v\u00eatements sont des acteurs essentiels de notre quotidien afin de satisfaire le confort thermique du corps humain. Cependant, les v\u00eatements conventionnels pr\u00e9sentent g\u00e9n\u00e9ralement des performances thermiques m\u00e9diocres et peu contr\u00f4l\u00e9es. En effet, une variation brutale de la temp\u00e9rature de la pi\u00e8ce affecte consid\u00e9rablement le confort thermique du corps. D\u2019o\u00f9 la n\u00e9cessit\u00e9 d\u2019utiliser de mani\u00e8re continue des syst\u00e8mes de chauffage, ventilation, et climatisation (CVC) dans des espaces clos, afin de maintenir un environnement thermique appropri\u00e9 de la pi\u00e8ce. Cependant cette solution montre clairement ses limites par une consommation \u00e9nerg\u00e9tique consid\u00e9rable qui affecte les secteurs de l\u2019\u00e9conomie, de l\u2019\u00e9nergie et de l\u2019environnement. Le d\u00e9veloppement de nouveaux textiles capables de g\u00e9rer, \u00e0 proximit\u00e9 de la peau, la temp\u00e9rature du corps humain sur une large gamme de temp\u00e9ratures ambiantes, sans apport d\u2019\u00e9nergie suppl\u00e9mentaire, appara\u00eet alors comme une solution alternative d\u2019une urgente n\u00e9cessit\u00e9.<br \/>\nLe corps humain, pour une temp\u00e9rature de peau de 34\u00b0C, \u00e9met des rayonnements \u00e9lectromagn\u00e9tiques (EM) dans le moyen infrarouge (MIR) responsables de plus de 50% des pertes thermiques d\u2019un individu. Une compr\u00e9hension et une ma\u00eetrise de ces rayonnements permettraient de contr\u00f4ler la temp\u00e9rature du microclimat, espace d\u2019air entre le corps et le textile. Dans ce contexte, concevoir des textiles passifs, qui modulent les rayonnements MIR, pr\u00e9sente un d\u00e9fi pour la communaut\u00e9 scientifique.<br \/>\nLe but de la th\u00e8se est d\u2019\u00e9tudier th\u00e9oriquement et exp\u00e9rimentalement les r\u00e9ponses spectrales dans le MIR (5-15 \u00b5m) de diff\u00e9rentes membranes \u00e0 faibles indices de r\u00e9fraction afin de contr\u00f4ler la thermor\u00e9gulation individuelle. Nous avons d\u00e9montr\u00e9 que l\u2019insertion de particules dans des membranes permettait de moduler son absorption et donc, selon la loi de Kirchhoff, son \u00e9missivit\u00e9. Sur la base de ces r\u00e9sultats, nous avons propos\u00e9 un tissu asym\u00e9trique \u00e0 r\u00e9chauffement radiatif haute performance pour des environnements pr\u00e9sentant des temp\u00e9ratures allant de froides \u00e0 mod\u00e9r\u00e9es. Dans un deuxi\u00e8me temps, nous avons \u00e9largi l\u2019\u00e9tude aux propri\u00e9t\u00e9s de transmission, r\u00e9flexion, absorption et diffusion de membranes photoniques \u00e0 base de polym\u00e8re. Nous avons montr\u00e9 que celles-ci, sous certaines conditions g\u00e9om\u00e9triques, \u00e9taient capables de moduler le rayonnement EM dans le MIR, permettant ainsi d\u2019agir sur la thermor\u00e9gulation du microclimat.<\/p>\n<h5>Abstract:<\/h5>\n<p>Clothing is an essential part of our daily life in order to satisfy the thermal comfort of the human body. However, conventional clothing generally exhibits poor thermal performance and low means of control. Indeed, a sudden change in room temperature considerably affects the thermal comfort of the body. Hence the need for continuous use of heating, ventilation, and air conditioning (HVAC) systems in indoor areas, in order to maintain an appropriate thermal environment of the room. However, this solution clearly shows its limitations by the huge energy consumption implied which affects the sectors of economy, energy, and environment. Therefore, the development of new textiles able to manage the temperature of the human body close to the skin over a wide range of ambient temperatures, without additional energy input, appears to be an urgently needed alternative solution.<br \/>\nThe human body, at a skin temperature of 34 \u00b0C, emits electromagnetic (EM) radiation in the mid-infrared (MIR) responsible for more than 50% of individual\u2019s heat loss. Understanding and control those radiation would enable to control the temperature of the microclimate temperature, corresponding to the air space between the body and the textile. In that context, designing passive textiles, which modulate MIR radiation, presents a challenge for the scientific community.<br \/>\nThe objective of the thesis is to theoretically and experimentally study the spectral responses in the MIR (5-15 \u00b5m) of different membranes with low refractive indexes in order to control individual thermoregulation. We have shown that the insertion of particles into membranes modulates its absorption and therefore, according to Kirchhoff\u2019s law, its emissivity. Based on these results, we proposed a high performant radiative warming asymmetric fabric for environments from cold to moderate temperatures. Secondly, we extended the study to the transmission, reflection, absorption and diffusion properties of polymer-based photonic membranes. We have shown that these latter, under specific geometric conditions, were able to modulate the EM radiation in the MIR, thus making it possible to act on the thermoregulation of the microclimate.<\/p>\n<\/div><\/section><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":13052,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,65,316],"tags":[],"class_list":["post-52347","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-agenda","category-theses-2022"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/52347","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=52347"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/52347\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media\/13052"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=52347"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=52347"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=52347"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}