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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Métodos Semi-Empíricos: princípios básicos e aplicações / Semi-Empirical Methods: basics principles and uses

Bretanha Neto, Nelson [UNESP] 18 December 2015 (has links)
Submitted by Nelson Bretanha (physikosmos@gmail.com) on 2016-01-01T12:55:20Z No. of bitstreams: 1 Métodos Semi-Empíricos (Princípios Básicos e Aplicações).pdf: 4755970 bytes, checksum: 0e2d74ff6ffd8de112da824ec714d84e (MD5) / Approved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2016-01-05T18:04:11Z (GMT) No. of bitstreams: 1 bretanhaneto_ne_me_rcla.pdf: 4755970 bytes, checksum: 0e2d74ff6ffd8de112da824ec714d84e (MD5) / Made available in DSpace on 2016-01-05T18:04:11Z (GMT). No. of bitstreams: 1 bretanhaneto_ne_me_rcla.pdf: 4755970 bytes, checksum: 0e2d74ff6ffd8de112da824ec714d84e (MD5) Previous issue date: 2015-12-18 / Neste trabalho investigamos os efeitos decorrentes da presença de heteroátomos numa folha de “supercoroneno” (molécula C58H18 utilizada como uma primeira aproximação para o grafeno). Mais especificamente, utilizando método semi-empírico PM6, implementado no pacote computacional MOPAC2012®, estudamos as diferentes curvas de energia (calor de formação). As curvas estudadas foram obtidas pela passagem de um átomo de carbono sobre uma folha de supercoroneno na qual existe um heteroátomo (foram utilizadas três diferentes estruturas: C57H18Si, C57H18Ge e C57H18Sn). Nesse contexto, estudamos também o efeito destes heteroátomos sobre a densidade eletrônica e os orbitais HOMO e LUMO das diferentes estruturas. / In this work we investigate the effects of the presence of heteroatoms on a “supercoronene” sheet (C58H18 molecule used as a molecular model for graphene). Specifically, we used the semiempirical method PM6 as implemented in MOPAC2012® software to study several (formation) energy curves. The energy curves were obtained by positioning a carbon atom over a “supercoronene” sheet in which there is a heteroatom (this was done for three different structures: C57H18Si, C57H18Ge and C57H18Sn). In this context, the effect of these heteroatoms on the electronic density distributions, as well as their effect on HOMO and LUMO orbitals were also investigated.

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