{"id":1043,"date":"2021-09-19T21:07:26","date_gmt":"2021-09-20T00:07:26","guid":{"rendered":"https:\/\/www.ifsc.usp.br\/lemaf\/?page_id=1043"},"modified":"2021-09-19T21:09:51","modified_gmt":"2021-09-20T00:09:51","slug":"bradtmuller","status":"publish","type":"page","link":"https:\/\/www.ifsc.usp.br\/lemaf\/team\/bradtmuller\/","title":{"rendered":"Dr. Henrik Bradtm\u00fcller"},"content":{"rendered":"

Elucidating structural rearrangements during glass relaxation and crystallization<\/strong><\/span><\/h3>\n

Glasses are a class of materials with fundamental importance for humankind stemming from numerous basic and high-technology applications. Due to the wide spectrum of attainable physical and mechanical properties glass research receives considerable attention from both private enterprises and academic research facilities worldwide. Despite all efforts, the characterization of these thermodynamically unstable materials remains inherently challenging. The lack of long-range structural order renders applications of the powerful X-Ray diffraction futile. In pursuit of fully grasping glass structure, local ordering on the sub-nanometer length scale has to be probed, however, currently there are only few suitable methodological means to this end. Even though significant progress in the understanding of glass structure has been made in the last decades, dynamic processes and structural rearrangements occurring during the thermal relaxation or crystallization of glasses are especially poorly understood. Recent research progress points out the special role of the intermediate-range order in glasses \u2013 i.e., structural order in dimensions between about 0.3 to 0.5 nm \u2013 to give potentially crucial insights into devitrification processes. In order to improve the fundamental understanding of this problem, this project uses an interdisciplinary approach, combining Raman and advanced solid-state nuclear magnetic resonance (NMR) spectroscopies with molecular dynamics (MD) simulations.<\/span><\/p>\n

Projeto PT-BR<\/span><\/p>\n

Elucida\u00e7\u00e3o de rearranjos estruturais durante o processo de relaxa\u00e7\u00e3o e cristaliza\u00e7\u00e3o de materiais v\u00edtreos<\/strong><\/span><\/h3>\n

Devido a in\u00fameras aplica\u00e7\u00f5es b\u00e1sicas e de alta tecnologia, vidros s\u00e3o uma classe de materiais de fundamental import\u00e2ncia para a humanidade. Gra\u00e7as ao amplo espectro de propriedades f\u00edsicas e mec\u00e2nicas ating\u00edveis, a pesquisa em vidros \u00e9 extremamente ativa, tanto em empresas quanto em institutos de pesquisa acad\u00eamica em todo o mundo. Apesar de todos os esfor\u00e7os, a caracteriza\u00e7\u00e3o desses materiais termodinamicamente inst\u00e1veis \u00e9 inerentemente desafiadora. A falta de periodicidade de longo alcance torna qualquer esfor\u00e7o de caracteriza\u00e7\u00e3o utilizando aplica\u00e7\u00f5es da poderosa t\u00e9cnica de difra\u00e7\u00e3o com raios X infrut\u00edfero. Portanto, a caracteriza\u00e7\u00e3o da estrutura v\u00edtrea geralmente depende de informa\u00e7\u00e3o da ordem local (escala de comprimento sub-nanom\u00e9trica). Entretanto, existem poucas metodologias para essa finalidade. Embora progressos significativos no entendimento da estrutura v\u00edtrea tenham sido alcan\u00e7ados nas \u00faltimas d\u00e9cadas, processos din\u00e2micos e rearranjos estruturais que ocorrem durante o relaxamento t\u00e9rmico ou a cristaliza\u00e7\u00e3o de subst\u00e2ncias formadoras de vidro s\u00e3o especialmente pouco compreendidos. Estudos recentes apontam o papel especial do estudo do ordenamento em escala intemedi\u00e1ria nos vidros – ou seja, ordenamento estrutural em dimens\u00f5es entre cerca de 0,3 a 0,5 nm – para fornecer informa\u00e7\u00e3o importante a respeito dos processos de devitrifica\u00e7\u00e3o. Para melhorar o entendimento fundamental deste problema, este projeto prop\u00f5e uma abordagem interdisciplinar, que combina t\u00e9cnicas de espectroscopia Raman e t\u00e9cnicas avan\u00e7adas de RMN de alta resolu\u00e7\u00e3o com simula\u00e7\u00f5es de din\u00e2mica molecular (MD).<\/span><\/p>\n

Links pessoais:<\/strong><\/span><\/h3>\n

https:\/\/hbrmn.github.io\/<\/a>
\nhttp:\/\/bradtmueller.net<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Elucidating structural rearrangements during glass relaxation and crystallization Glasses are a class of materials with fundamental importance for humankind stemming from numerous basic and high-technology applications. Due to the wide spectrum of attainable physical and mechanical properties glass research receives considerable attention from both private enterprises and academic research facilities worldwide. Despite all efforts, the…
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