{"id":61408,"date":"2023-12-08T16:41:58","date_gmt":"2023-12-08T14:41:58","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=61408"},"modified":"2024-01-16T16:59:57","modified_gmt":"2024-01-16T14:59:57","slug":"les-metamateriaux-mecaniques-et-acoustiques-et-le-concept-darchitecture-de-la-cellule-unitaire","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/newsletter\/les-metamateriaux-mecaniques-et-acoustiques-et-le-concept-darchitecture-de-la-cellule-unitaire.html","title":{"rendered":"Metamaterials (mechanical and acoustic) and the concept of unit cell architecture"},"content":{"rendered":"<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-sx3vs0-44b2a8ab14b4051c54bfc3098d7228b7\">\n.flex_column.av-sx3vs0-44b2a8ab14b4051c54bfc3098d7228b7{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-sx3vs0-44b2a8ab14b4051c54bfc3098d7228b7 av_one_full  avia-builder-el-0  el_before_av_one_half  avia-builder-el-first  first flex_column_div av-zero-column-padding'     ><p><section  class='av_textblock_section av-lq2h9d9t-12a3a08f2f507a08a759475a77dc6679'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-62291 size-full\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/metamateriaux5.jpg\" alt=\"\" width=\"1000\" height=\"191\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/metamateriaux5.jpg 1000w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/metamateriaux5-300x57.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/metamateriaux5-768x147.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/metamateriaux5-18x3.jpg 18w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/metamateriaux5-705x135.jpg 705w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-lq2gsmqj-1502b9fe0245d0adffd65f475a0b3bb2'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h1 style=\"text-align: center;\"><span style=\"color: #097482;\">Metamaterials (mechanical and acoustic) and the concept of unit cell architecture<\/span><\/h1>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lq3g1xs9-af6de04b71109c438524db760bb6479a\">\n#top .av_textblock_section.av-lq3g1xs9-af6de04b71109c438524db760bb6479a .avia_textblock{\nfont-size:14px;\n}\n<\/style>\n<section  class='av_textblock_section av-lq3g1xs9-af6de04b71109c438524db760bb6479a'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><span style=\"color: #000000;\">Although there is no universally accepted definition of metamaterials in mechanics and acoustics, it is accepted that \"geometry\" plays a fundamental role in determining their static and dynamic properties. While in the early 2000s, the shapes considered were rather canonical (matrix with circular or square inclusions, etc.), over time, increasingly complex geometries have been explored thanks to the increased computing power of computers and the evolution of manufacturing technologies.<\/span> <span style=\"color: #097482;\"><span style=\"color: #000000;\">In this context,<\/span> Nature, thanks to millions of years of evolution, is a great master of \"material architecture\" to obtain specific advanced properties and geometries focused on precise functionalities. Taking inspiration from hierarchical or fractal architectures, typical of the majority of biological systems, we show that by reproducing this structural enrichment at the mesoscale of metamaterials we induce behaviors of great richness, opening up new perspectives for the control of elastic waves based on the simultaneous activation of various wave attenuation mechanisms.<\/span><\/p>\n<\/div><\/section><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-15dykqo-690853588527c9e0b6608de3de826593\">\n.flex_column.av-15dykqo-690853588527c9e0b6608de3de826593{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-15dykqo-690853588527c9e0b6608de3de826593 av_one_half  avia-builder-el-4  el_after_av_one_full  el_before_av_one_half  first flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-lq2hhk08-2b698380024dc00bff08dc43dac32f95'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h5>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-qawvnx-eb0fa84a59d44b41dd8d2a500ef04acb\">\n.av_font_icon.av-qawvnx-eb0fa84a59d44b41dd8d2a500ef04acb{\ncolor:#097482;\nborder-color:#097482;\n}\n.av_font_icon.av-qawvnx-eb0fa84a59d44b41dd8d2a500ef04acb .av-icon-char{\nfont-size:20px;\nline-height:20px;\n}\n<\/style>\n<span  class='av_font_icon av-qawvnx-eb0fa84a59d44b41dd8d2a500ef04acb avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue881' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/h5>\n<h4><span style=\"color: #097482;\">Metamaterials (mechanical and acoustic) and the concept of unit cell architecture<\/span><\/h4>\n<p><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/metamateriaux4.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-62288 alignleft\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/metamateriaux4-300x113.jpg\" alt=\"\" width=\"300\" height=\"113\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/metamateriaux4-300x113.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/metamateriaux4-18x7.jpg 18w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/metamateriaux4.jpg 400w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>Although there is as yet no universally accepted definition of \"mechanical and\/or acoustic metamaterials\", the scientific community tends to identify them as \"composites with a periodic or quasi-periodic architecture, designed to produce an atypical static or dynamic response to specific stresses\".<br \/>\nThe \"geometry\" aspect therefore plays a fundamental role in determining the properties of metamaterials. For example, in dynamics, at filling fraction parity(1), the shape of the inclusions (or voids) and their distribution in the unit cell (circle-shaped, tile-shaped, cross-shaped, etc., centered, arranged at the edges, etc.) can lead to the opening of forbidden bands (frequencies in which wave propagation is strongly attenuated) or to curves with a negative slope in the dispersion diagram, and achieve atypical behaviors such as negative refraction, topological protection, perfect absorption, and so on.<\/p>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-wns4tc-1db3423f7cd08c59a5a437f03f40996e\">\n.flex_column.av-wns4tc-1db3423f7cd08c59a5a437f03f40996e{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-wns4tc-1db3423f7cd08c59a5a437f03f40996e av_one_half  avia-builder-el-7  el_after_av_one_half  el_before_av_one_full  flex_column_div av-zero-column-padding  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lrggoxld-b9fda0964e2eb6a8c68b67bd72300709\">\n#top .hr.hr-invisible.av-lrggoxld-b9fda0964e2eb6a8c68b67bd72300709{\nheight:55px;\n}\n<\/style>\n<div  class='hr av-lrggoxld-b9fda0964e2eb6a8c68b67bd72300709 hr-invisible  avia-builder-el-8  el_before_av_textblock  avia-builder-el-first  av-small-hide av-mini-hide'><span class='hr-inner'><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<section  class='av_textblock_section av-lq2hhk08-2b698380024dc00bff08dc43dac32f95'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p>Similarly, when local resonance effects are the main players responsible for the overall behavior of the metamaterial, the shape (and arrangement) of the resonators becomes essential. In this sense, we could say that<strong><span style=\"color: #097482;\"> metamaterials embody the concept of architecture.<\/span><\/strong><br \/>\nAt the beginning of the 2000s, the shapes considered were rather canonical (circular, square, etc.), but increasingly complex geometries have since been explored. This has been made possible by (i) the increased computing power of computers, and (ii) developments in manufacturing technologies. Two important examples are 3D printing, which makes it possible to produce increasingly complex shapes at reasonable prices, and (photo-)lithography, which offers unprecedented resolution over several length scales.<\/p>\n<p><em><span style=\"font-weight: 400;\">(1)<\/span><span style=\"font-weight: 400;\"> Ratio of the volumes making up the matrix and the inclusion in a unit cell.<\/span><\/em><\/p>\n<\/div><\/section><\/p><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lrgd3qxy-c5901fbe23ac602b7451221c36a0022d\">\n.flex_column.av-lrgd3qxy-c5901fbe23ac602b7451221c36a0022d{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\nbackground-color:rgba(255,255,255,0.79);\n}\n<\/style>\n<div  class='flex_column av-lrgd3qxy-c5901fbe23ac602b7451221c36a0022d av_one_full  avia-builder-el-10  el_after_av_one_half  el_before_av_one_half  first flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-lq2hhk08-2b698380024dc00bff08dc43dac32f95'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><span style=\"color: #000000;\"><span style=\"color: #008080;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-62280\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/forme6-300x287.jpg\" alt=\"\" width=\"200\" height=\"191\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/forme6-300x287.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/forme6-13x12.jpg 13w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/forme6.jpg 400w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/12\/forme4.png\"><br \/>\n<\/a><\/span><\/span><\/p>\n<h5>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-qawvnx-85d2366412218a7ffab4a2f7f182f097\">\n.av_font_icon.av-qawvnx-85d2366412218a7ffab4a2f7f182f097{\ncolor:#097482;\nborder-color:#097482;\n}\n.av_font_icon.av-qawvnx-85d2366412218a7ffab4a2f7f182f097 .av-icon-char{\nfont-size:20px;\nline-height:20px;\n}\n<\/style>\n<span  class='av_font_icon av-qawvnx-85d2366412218a7ffab4a2f7f182f097 avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue871' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/h5>\n<p><span style=\"color: #000000;\"><span style=\"color: #008080;\">This paved the way for<\/span> <strong><span style=\"color: #008080;\">a new vision of the concept of \"architecture\" associated with metamaterials, i.e. \"introducing, between the scale of the microstructure of the constituent material and that of the macrostructure, one or more other scales of organisation of matter\".<\/span><\/strong> <span style=\"color: #008080;\">The hierarchical or fractal structures found in most biological systems, where the same geometry can be repeated in a 'self-similar' or 'non-self-similar' way on several scales, are clear examples. These scales, described as mesoscopic, may be weakly separated (coupled) from the macroscopic scale and<\/span> <strong><span style=\"color: #008080;\">to induce a wide range of effective behaviours.<\/span><\/strong><\/span><\/p>\n<\/div><\/section><\/div><\/p>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lrgd3qxy-30582e3232bd29f97162ddfd3b97cb29\">\n.flex_column.av-lrgd3qxy-30582e3232bd29f97162ddfd3b97cb29{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\nbackground-color:rgba(255,255,255,0.79);\n}\n<\/style>\n<div  class='flex_column av-lrgd3qxy-30582e3232bd29f97162ddfd3b97cb29 av_one_half  avia-builder-el-13  el_after_av_one_full  el_before_av_one_half  first flex_column_div av-zero-column-padding avia-full-stretch  column-top-margin'     ><section  class='av_textblock_section av-lq2hhk08-2b698380024dc00bff08dc43dac32f95'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h5>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-qawvnx-eb0fa84a59d44b41dd8d2a500ef04acb\">\n.av_font_icon.av-qawvnx-eb0fa84a59d44b41dd8d2a500ef04acb{\ncolor:#097482;\nborder-color:#097482;\n}\n.av_font_icon.av-qawvnx-eb0fa84a59d44b41dd8d2a500ef04acb .av-icon-char{\nfont-size:20px;\nline-height:20px;\n}\n<\/style>\n<span  class='av_font_icon av-qawvnx-eb0fa84a59d44b41dd8d2a500ef04acb avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue881' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/h5>\n<h5><span style=\"color: #097482;\">Bio-inspiration in metamaterials: Nature, the grand master of material architecture<\/span><\/h5>\n<p>Although mankind has only recently begun to exploit complex architectures (mainly because of technological limitations),<strong> Nature<\/strong>thanks to millions of years of evolution, <strong>is a great master of 'hardware architecture' to obtain specific advanced properties and geometries focused on precise functionalities.<\/strong> In fact, the common feature leading to these surprising properties often lies in <strong><span style=\"color: #097482;\">hierarchical organisation<\/span><\/strong> of matter on several scales (an organisation observed in many natural materials such as wood, bone, sponges, etc.). As a result, increasing attention has been devoted in recent years to the synthesis of artificial materials inspired by nature, but mainly targeting quasi-static performance. In contrast, the consideration of hierarchical organisation in the design of the elementary cell of phononic crystals and metamaterials (mechanical and acoustic)(2) is only very recent.<\/p>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-lq2hhk08-2b698380024dc00bff08dc43dac32f95'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><em><span style=\"font-weight: 400;\">(2)<\/span><span style=\"font-weight: 400;\"> Material architecture is understood here as \"the organisation of a unit cell repeated on several levels of scale\".<\/span><\/em><\/p>\n<\/div><\/section><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lrgd3qxy-85885b18c34e633c36b04ef76becb25c\">\n.flex_column.av-lrgd3qxy-85885b18c34e633c36b04ef76becb25c{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\nbackground-color:rgba(255,255,255,0.79);\n}\n<\/style>\n<div  class='flex_column av-lrgd3qxy-85885b18c34e633c36b04ef76becb25c av_one_half  avia-builder-el-17  el_after_av_one_half  el_before_av_one_full  flex_column_div av-zero-column-padding avia-full-stretch  column-top-margin'     ><section  class='av_textblock_section av-lq2hhk08-2b698380024dc00bff08dc43dac32f95'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p>In this context, we presented<strong> a new type of metamaterial<\/strong> made up of a polymer matrix with <strong>non-self-similar cross-shaped holes repeated at several scale levels<\/strong>. This has enabled us to achieve highly attenuating behaviour compared with elastic waves on several frequency scales, thanks to the fact that the 'non-self-similar hierarchy' leads to the opening up of multiple (and wide) forbidden bands, including in the sub-wavelength regime (i.e. when the wavelength of the wave to be attenuated is much greater than the size of the structure itself).<\/p>\n<p>By means of numerical models and scanning laser vibrometer measurements, we have revealed that the \"non-self-similar\" hierarchy allows the opening of such forbidden bands thanks to <strong>the simultaneous activation of multiple mitigation mechanisms<\/strong>\u00a0Bragg scattering, local resonance and\/or inertial amplification. These mechanisms have been clearly identified by analysing the imaginary part of the wavenumber. This multi-mechanism design approach leads to enriched dynamics at different scales (opening of additional band gaps, conservation of existing band gaps shifted in frequency, as well as the possibility of preserving the global deformation mechanisms of the previous hierarchical levels, despite the variation in the mass\/rigidity ratio of the overall system).<\/p>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-wns4tc-219c562a3ab67f2abbe45e15506bd8de\">\n@keyframes av_boxShadowEffect_av-wns4tc-219c562a3ab67f2abbe45e15506bd8de-column {\n0%   { box-shadow:  0 0 0 0 #a8a8a8; opacity: 1; }\n100% { box-shadow:  0 0 10px 0 #a8a8a8; opacity: 1; }\n}\n.flex_column.av-wns4tc-219c562a3ab67f2abbe45e15506bd8de{\nbox-shadow: 0 0 10px 0 #a8a8a8;\nborder-radius:20px 20px 20px 20px;\npadding:20px 20px 20px 20px;\nbackground-color:rgba(85,160,159,0.9);\n}\n<\/style>\n<div  class='flex_column av-wns4tc-219c562a3ab67f2abbe45e15506bd8de av_one_full  avia-builder-el-19  el_after_av_one_half  el_before_av_hr  first flex_column_div shadow-not-animated  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lq2hhk08-61bfca4354f43205db21d8c8a6562023\">\n#top .av_textblock_section.av-lq2hhk08-61bfca4354f43205db21d8c8a6562023 .avia_textblock{\nfont-size:14px;\n}\n<\/style>\n<section  class='av_textblock_section av-lq2hhk08-61bfca4354f43205db21d8c8a6562023'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><span style=\"color: #ffffff;\">In conclusion, the enrichment of the architecture of metamaterials at the mesoscale induces very rich effective behaviours, offering new perspectives for the control of elastic waves, favouring the simultaneous activation of various wave attenuation mechanisms.<\/span><\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lq2hhk08-c520b3bf8e403fc3ea5a322185d78c47\">\n#top .av_textblock_section.av-lq2hhk08-c520b3bf8e403fc3ea5a322185d78c47 .avia_textblock{\nfont-size:12px;\n}\n<\/style>\n<section  class='av_textblock_section av-lq2hhk08-c520b3bf8e403fc3ea5a322185d78c47'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><strong><span style=\"color: #ffffff;\"> References :<\/span><\/strong><br \/>\n<span style=\"color: #ffffff;\"> <em>[1] Mazzotti, [...], Miniaci. Bio-inspired non-self-similar hierarchical elastic metamaterials. International Journal of Mechanical Sciences 241:107915 (2023).<\/em><\/span><br \/>\n<span style=\"color: #ffffff;\"> <em>[2] Miniaci et al. Bio-inspired hierarchical dissipative metamaterials, Physical Review Applied, 10, 024012 (2018).<\/em><\/span><\/p>\n<\/div><\/section><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lq3rrbn6-b2fad551015528b25fb537190ccf1056\">\n#top .hr.hr-invisible.av-lq3rrbn6-b2fad551015528b25fb537190ccf1056{\nheight:20px;\n}\n<\/style>\n<div  class='hr av-lq3rrbn6-b2fad551015528b25fb537190ccf1056 hr-invisible  avia-builder-el-22  el_after_av_one_full  el_before_av_textblock'><span class='hr-inner'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<section  class='av_textblock_section av-lq3ru9ya-f6b76a2798525607f872d4bf4739c6be'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div  class='avia-button-wrap av-rpqvoq-9a05bde6f0cd05381e571d282e3fe825-wrap avia-button-left  avia-builder-el-24  avia-builder-el-no-sibling'><a href='mailto:marco.miniaci@univ-lille.fr'  class='avia-button av-rpqvoq-9a05bde6f0cd05381e571d282e3fe825 av-link-btn avia-icon_select-yes-left-icon avia-size-small avia-position-left avia-color-silver'   aria-label=\"marco.miniaci@univ-lille.fr\"><span class='avia_button_icon avia_button_icon_left' aria-hidden='true' data-av_icon='\ue805' data-av_iconfont='entypo-fontello'><\/span><span class='avia_iconbox_title' >marco.miniaci@univ-lille.fr<\/span><\/a><\/div>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[297],"tags":[],"class_list":["post-61408","post","type-post","status-publish","format-standard","hentry","category-newsletter"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/61408","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=61408"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/61408\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=61408"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=61408"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=61408"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}