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Doctoral Thesis
DOI
https://doi.org/10.11606/T.46.2016.tde-30062016-150459
Document
Author
Full name
Marcello Ferreira da Costa
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2005
Supervisor
Committee
Ribeiro, Mauro Carlos Costa (President)
Borin, Antonio Carlos
Degreve, Leo
Freitas, Luiz Carlos Gomide
Ornellas, Fernando Rei
Title in Portuguese
Dinâmica molecular de sistemas iônicos poliatômicos: modelos polarizável e não-polarizável
Keywords in Portuguese
ab initio
Cargas flutuantes
Dinâmica Molecular
EEM - Método da equalização da eletronegatividade
Eletroquímica
Física molecular
Misturas alcalinas
Orbital molecular
Química quântica
Química teórica
Abstract in Portuguese
Simulações de sais de carbonato fundidos pelo método de Dinâmica Molecular (MD) foram efetuadas com o modelo polarizável de cargas flutuantes (FC). O modelo de cargas flutuantes implementa os efeitos de polarização pelo método de Lagrangiano estendido, onde as variáveis extras são as próprias cargas parciais do íon poliatômico. O modelo FC foi parametrizado por meio de cálculos ab inito, aplicado ao ânion carbonato. Cálculos de Química Quântica ab initio foram utilizados para corroborar o modelo proposto para o ânion carbonato. Os sistemas investigados consistem em misturas de carbonatos alcalinos fundidos, Li2CO3/K2CO3, os quais são utilizados como eletrólitos em células a combustível. As simulações MD foram utilizadas para verificar o efeito da polarização dos ânions sobre a estrutura e dinâmica do líquido. Estudamos o efeito da inclusão de polarização sobre a condutividade do eletrólito.
Title in English
Molecular dynamics of polyatomic ionic systems: Polarized models and not polarizable
Keywords in English
ab initio
Alkaline mixtures
EEM - the Electronegativity equalization method
Electrochemistry
Floating charges
Molecular dynamics
Molecular orbital
Molecular physics
Quantum chemistry
Theoretical chemistry
Abstract in English
Simulations of molten carbonate salts by the method of Molecular Dynamics (MD) have been performed with the fluctuanting charge (FC) model. The FC model implements the effect of polarization by using method of extended Lagrangian, where the extra variables are the partial charges of the poliatomic ion. The FC model was parametrized by ab inito calculations os a single carbonate anion. Quantum Chemistry calculations bave been used to corroborate the model for the carbonate anion. The investigated systems consist of alkaline carbonate mixtures, Li2CO3/K2CO3, which are used as electrolytes in fuel cells. MD simulations have been used to verify polarization effects on structure and dynamics of the liquid. We study the effect of including anion polarization on the condutivity of the electrolyte.
 
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Publishing Date
2016-06-30
 
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