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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

Estudo de nanofios de Au e dendrímeros

COSTA, José Francisco da Silva 12 January 2010 (has links)
Submitted by Cleide Dantas (cleidedantas@ufpa.br) on 2014-04-22T13:22:37Z No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_EstudosNanofioAu.pdf: 2113934 bytes, checksum: 110a371f4dc2b245e6b80dfecdccf56d (MD5) / Approved for entry into archive by Ana Rosa Silva (arosa@ufpa.br) on 2014-06-10T13:28:37Z (GMT) No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_EstudosNanofioAu.pdf: 2113934 bytes, checksum: 110a371f4dc2b245e6b80dfecdccf56d (MD5) / Made available in DSpace on 2014-06-10T13:28:37Z (GMT). No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_EstudosNanofioAu.pdf: 2113934 bytes, checksum: 110a371f4dc2b245e6b80dfecdccf56d (MD5) Previous issue date: 2012 / FAPESPA - Fundação Amazônia de Amparo a Estudos e Pesquisas / CVRD - Companhia Vale do Rio Doce / A primeira parte deste trabalho aborda a simulação computacional de dinâmica molecular clássica da interação de sistemas matriciais constituídos de nanofios paralelos de Au simuladas em função do tempo. Como resultados foram encontrados os tempos de colisões entre os fios da matriz. A segunda parte deste trabalho utiliza dinâmica molecular clássica para simular cinco gerações de dendrímeros PAMAM, cada qual interagindo individualmente com um nanotubo de carbono em função do tempo resultando num motor molecular. Além disso, foram calculados os espectros de absorção deste sistema e foi verificado que eles são nanomotores controlados pela luz. Para todos estes sistemas foram calculadas energias cinética, potencial, total, velocidade, propriedades termodinâmicas como variação de entropia molar, capacidade molar térmica e temperatura in situ. Estas grandezas nos forneceram valiosas informações sobre o comportamento destes sistemas. / First part of this work is about the classical molecular dynamics simulation of the interaction of matrix systems of parallel nanowires of Au as a function of time. The results find the time of collision between the wires of the array. The second part of this work is using classical molecular dynamics simulation for five generations of PAMAM dendrimers, each interacting individually with a carbon nanotube as a function of time resulting in a molecular motor. Furthermore, it were calculated the absorption spectra of this system and it was found that they could be nanomotors controlled by light. For all these systems were calculated kinetic energy, potential, speed, thermodynamic properties as molar entropy variation, molar heat capacity and temperature in situ. These quantities provide us with valuable information about the behavior of these systems.

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