{"id":154,"date":"2018-03-13T15:03:52","date_gmt":"2018-03-13T18:03:52","guid":{"rendered":"http:\/\/ifimatdev.exa.unicen.edu.ar\/?page_id=154"},"modified":"2021-05-12T21:36:48","modified_gmt":"2021-05-13T00:36:48","slug":"positrones-alfredo-dupasquier","status":"publish","type":"page","link":"https:\/\/ifimat.exa.unicen.edu.ar\/grupos-de-investigacion\/positrones-alfredo-dupasquier\/","title":{"rendered":"Grupo Positrones Alfredo Dupasquier"},"content":{"rendered":"

[vc_row][vc_column][vc_custom_heading source=”post_title” use_theme_fonts=”yes”][vc_separator color=”custom” align=”align_left” border_width=”5″ el_width=”10″ accent_color=”#ffdd00″][vc_column_text]El Grupo Positrones Alfredo Dupasquier<\/strong> se ocupa principalmente del estudio experimental de fen\u00f3menos f\u00edsicos relacionados con la formaci\u00f3n o presencia de estructuras a escala at\u00f3mica o nanom\u00e9trica (defectos, huecos, precipitados, vol\u00famenes libres) presentes, ya sea a nivel sub-superficial o volum\u00e9trico, en materiales de inter\u00e9s tecnol\u00f3gico.<\/p>\n

Los principales materiales objeto de investigaci\u00f3n por parte del GPAD son:[\/vc_column_text][vc_row_inner css=”.vc_custom_1520963847069{margin-bottom: 0px !important;padding-bottom: 0px !important;}”][vc_column_inner width=”1\/3″][vc_btn title=”Sistemas met\u00e1licos” style=”flat” color=”info” link=”url:http%3A%2F%2Fifimat.exa.unicen.edu.ar%2Fgrupos-de-investigacion%2Fpositrones-alfredo-dupasquier%2Fsistemas-metalicos%2F|||”][\/vc_column_inner][vc_column_inner width=”1\/3″][vc_btn title=”Pol\u00edmeros y materiales porosos” style=”flat” color=”info” link=”url:http%3A%2F%2Fifimat.exa.unicen.edu.ar%2Fgrupos-de-investigacion%2Fpositrones-alfredo-dupasquier%2Fpolimeros-y-materiales-porosos%2F|||”][\/vc_column_inner][vc_column_inner width=”1\/3″][vc_btn title=”Sistemas complejos” style=”flat” color=”info” link=”url:http%3A%2F%2Fifimat.exa.unicen.edu.ar%2Fgrupos-de-investigacion%2Fpositrones-alfredo-dupasquier%2Fsistemas-complejos%2F|||”][\/vc_column_inner][\/vc_row_inner][vc_column_text]<\/p>\n

\n
\n

Como t\u00e9cnica principal de an\u00e1lisis se utilizan distintas variantes experimentales de la t\u00e9cnica nuclear Espectroscopia de Aniquilaci\u00f3n de Positrones (tiempo de vida, ensanchamiento Doppler convencional y en coincidencia y\/o haces de positrones lentos).<\/p>\n

Adem\u00e1s, como modo de complementar la informaci\u00f3n obtenida, seg\u00fan la tem\u00e1tica abordada, se utilizan distintas t\u00e9cnicas experimentales disponibles en nuestro Laboratorio (por ejemplo, microdureza y calorimetr\u00eda diferencial de barrido) o en otros laboratorios de reconocido prestigio, del pa\u00eds o del exterior, con los cuales se mantienen colaboraciones efectivas (microscop\u00eda electr\u00f3nica de transmisi\u00f3n convencional y de alta resoluci\u00f3n, microscop\u00eda electr\u00f3nica de barrido, espectroscop\u00eda de impedancia, difracci\u00f3n de rayos X, mediciones de la cin\u00e9tica de absorci\u00f3n-desorci\u00f3n de hidr\u00f3geno, reometr\u00eda, ensayos de hinchamiento, propiedades mec\u00e1nicas, entre otras).<\/p>\n

Por otra parte, con el objetivo de obtener informaci\u00f3n adicional y ahondar en la interpretaci\u00f3n de los resultados experimentales u obtener informaci\u00f3n de car\u00e1cter predictivo, en algunos de los materiales estudiados se realizan c\u00e1lculos a primeros principios que permiten modelar el proceso de aniquilaci\u00f3n del par electr\u00f3n-positr\u00f3n. Para este fin, se hace uso de distintos esquemas de c\u00e1lculo, tanto no-autoconsistentes como autoconsistentes, basados en la Teor\u00eda de la Funcional Densidad que permiten calcular par\u00e1metros caracter\u00edsticos tales como el tiempo de vida del positr\u00f3n y la densidad en momento del par electr\u00f3n-positr\u00f3n que se aniquila.<\/p>\n<\/div>\n<\/div>\n

[\/vc_column_text][vc_custom_heading text=”Integrantes” use_theme_fonts=”yes”][vc_separator color=”custom” align=”align_left” border_width=”5″ el_width=”10″ accent_color=”#ffdd00″][vc_row_inner equal_height=”yes”][vc_column_inner width=”1\/4″]

\"Grupo<\/div><\/div>

Dr. Alberto Somoza<\/h4>

Director del Grupo Positrones Alfredo Dupasquier<\/p>

Profesor Titular, Investigador Superior CICPBA<\/div><\/div><\/div>\n[\/vc_column_inner][vc_column_inner width=”1\/4″]
\"Grupo<\/div><\/div>

Dr. Carlos Macchi<\/h4>
Profesor Adjunto, Investigador Independiente CONICET<\/div><\/div><\/div>\n[\/vc_column_inner][vc_column_inner width=”1\/4″]
\"Grupo<\/div><\/div>

Dr. Sebasti\u00e1n Anbinder<\/h4>
Investigador Adjunto CONICET<\/div><\/div><\/div>\n[\/vc_column_inner][vc_column_inner width=”1\/4″]
\"Grupo<\/div><\/div>

Dr. Mat\u00edas Quiroga<\/h4>
Investigador Asistente CONICET<\/div><\/div><\/div>\n[\/vc_column_inner][\/vc_row_inner][vc_row_inner equal_height=”yes”][vc_column_inner width=”1\/3″]
\"Grupo<\/div><\/div>

Dr. Santiago Est\u00e9vez Areco<\/h4>
Becario Posdoctoral Conicet<\/div><\/div><\/div>\n[\/vc_column_inner][vc_column_inner width=”1\/3″]
\"Grupo<\/div><\/div>

Ing. Eliana Lucanera<\/h4>
Becaria Doctoral CONICET<\/div><\/div><\/div>\n[\/vc_column_inner][vc_column_inner width=”1\/3″]
\"Grupo<\/div><\/div>

Lic. Giuliano Thomas<\/h4>
Becario Doctoral CONICET<\/div><\/div><\/div>\n[\/vc_column_inner][\/vc_row_inner][vc_custom_heading text=”Publicaciones (\u00faltimos 3 a\u00f1os)” use_theme_fonts=”yes”][vc_separator color=”custom” align=”align_left” border_width=”5″ el_width=”10″ accent_color=”#ffdd00″][vc_column_text]Charge transfer in PrDoped cerium oxide: Experimental and theoretical investigations<\/em>. Cristina De Oliveira, R; Cabral, L; Cabral, AC; Almeida, PB; Tibaldi, N; Sambrano, JR; Sim\u00f5es, AZ; Macchi, CE; Moura, F; Marques, GE; Ponce, MA; Longo, E. Materials chemistry and physics\u00a0249<\/strong> (2020).<\/p>\n

Structural properties of vegetable oil thermosets: Effect of crosslinkers, modifiers and oxidative aging<\/em>. Anbinder, S; Meiorin, C; Macchi, C; Mosiewicki, MA; Aranguren, MI; Somoza, A. European polymer journal 124<\/strong> (2020).<\/p>\n

A three dimensional kinetic Monte Carlo model for simulating the carbon\/sulfur mesostructural evolutions of discharging lithium sulfur batteries<\/em>. Thangavel E, Guerrero O X, Quiroga M A, Matsieguimikala A; Rucci A, Franco A A. Energy storage materials\u00a024<\/strong>, 472-485 (2019).<\/p>\n

Experimental and ab Initio Studies of Deep-Bulk Traps in Doped Rare-Earth Oxide Thick Films<\/em>. Rocha L S R, Schipani F, Aldao C\u00a0 M, Cabral L, Simoes A Z, Macchi C, Marques G E, Ponce M A, Longo E. Journal of Physical Chemistry C (2019).<\/p>\n

Professor Alfredo Dupasquier (1939-2015): In Memoriam<\/em>. Brusa R S, Somoza A. Aip Conference Proceedings 2182<\/strong> (200) 1-8 (2019).<\/p>\n

A study of the structural changes in a chitosan matrix produced by the adsorption of copper and chromium ions<\/em>. Anbinder P S, Macchi C, Amalvy J, Somoza A. Carbohydrate Polymers 222\u00a0<\/strong>(2019).<\/p>\n

Vacancy-like defects in nanocrystalline SnO2: influence of the annealing treatment under different atmospheres.<\/em> Macchi C,\u00a0\u00a0Ponce M,\u00a0\u00a0Desimone P,\u00a0\u00a0Aldao C,\u00a0\u00a0Somoza A. Philosopical Magazine. 98<\/strong>, 673-692 (2018).<\/p>\n

Natural rubber\/styrene-butadiene rubber blendsprepared by solution mixing: Influence of vulcanization temperature using a Semi-EV sulfur curing system on themicrostructural properties<\/em>. \u00a0Mansilla M, Marzocca A J, Macchi C, Somoza A. Polymer Testing 63<\/strong>, 150 (2017).<\/p>\n

Influence of the Crosslinking Content on the Structural Properties of Polybutadiene Rubbers with Different Isomeric Composition<\/em>. Rodriguez Garraza A, Mansilla M, Macchi C, Cerveny S, Marzocca A J, Somoza A. Defect and Diffusion Forum 373<\/strong>, 269 (2017).<\/p>\n

A Microstructural Study of Acrylic-Modified Chitosanby Means of PALS and SAXS. <\/em>Anbinder P, Macchi C, \u00a0Amalvy J, Somoza A. Defect and Diffusion Forum 373<\/strong>, 265 (2017).<\/p>\n

Effectof the composition and chemical aging in tung oil-styrene networks: Free volume and dynamic-mechanical properties<\/em>. Macchi C, Meiorin C, Mosiewicki M, Aranguren M, Somoza A. \u00a0European Polymer Journal 87<\/strong>, 231 (2017).[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"

[vc_row][vc_column][vc_custom_heading source=”post_title” use_theme_fonts=”yes”][vc_separator color=”custom” align=”align_left” border_width=”5″ el_width=”10″ accent_color=”#ffdd00″][vc_column_text]El Grupo Positrones Alfredo Dupasquier se ocupa principalmente del estudio experimental de fen\u00f3menos f\u00edsicos relacionados con la formaci\u00f3n o [\u2026]<\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":75,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/ifimat.exa.unicen.edu.ar\/wp-json\/wp\/v2\/pages\/154"}],"collection":[{"href":"https:\/\/ifimat.exa.unicen.edu.ar\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ifimat.exa.unicen.edu.ar\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ifimat.exa.unicen.edu.ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ifimat.exa.unicen.edu.ar\/wp-json\/wp\/v2\/comments?post=154"}],"version-history":[{"count":0,"href":"https:\/\/ifimat.exa.unicen.edu.ar\/wp-json\/wp\/v2\/pages\/154\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/ifimat.exa.unicen.edu.ar\/wp-json\/wp\/v2\/pages\/75"}],"wp:attachment":[{"href":"https:\/\/ifimat.exa.unicen.edu.ar\/wp-json\/wp\/v2\/media?parent=154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}