Molecular dynamics of triglycerides: atomistic and coarse-grained approaches

Brasiello, Antonio (2008) Molecular dynamics of triglycerides: atomistic and coarse-grained approaches. [Tesi di dottorato] (Inedito)

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Abstract

The objective of this thesis have been the development and the analysis of microscopic mathematical models to investigate the dependence of triglycerides conformations from environmental conditions. Triglycerides are important constituents of food products that show polymorphic solid transitions. Such behaviors influence greatly processes management involving fats mixtures. To investigate the relationship between macroscopic conditions and conformational induced properties, we dealt with microscopic mathematical models. The first part of the thesis regards the building of a united-atoms model from which physical properties and structural distribution functions of a liquid phase were derived. The second part regards the development of a coarse-grained model. The force field of such model was developed, by means of statistical tools, using suitable distribution functions derived from the atomistic one. The coarse-grained model was used to perform numerical experiments to highlight the dependence of molecules conformations from experimental conditions. The results of our simulations show a clear relationship between the conformational state of molecules and temperature annealing condition. Moreover, the improvement of order features through radial distribution functions was pointed out during several heating-cooling processes. The formation of small clusters of few planar molecules can be easily observed by means of visual inspection. The effect of simple flow conditions imposed on the system was also investigated. Imposed flows increase molecules mobility causing a raise of planar molecules and a greater uniform distribution of inter-molecular orientational order vector.

Tipologia di documento:Tesi di dottorato
Parole chiave:Molecular dynamics; Triglycerides; Coarse-grained
Settori scientifico-disciplinari MIUR:Area 09 Ingegneria industriale e dell'informazione > ING-IND/26 TEORIA DELLO SVILUPPO DEI PROCESSI CHIMICI
Coordinatori della Scuola di dottorato:
Coordinatore del Corso di dottoratoe-mail (se nota)
Maffettone, Pier Luca
Tutor della Scuola di dottorato:
Tutor del Corso di dottoratoe-mail (se nota)
Crescitelli, Silvestro
Stato del full text:Accessibile
Data:2008
Numero di pagine:162
Istituzione:Università degli Studi di Napoli Federico II
Dipartimento o Struttura:Ingegneria Chimica
Tipo di tesi:Dottorato
Stato dell'Eprint:Inedito
Denominazione del dottorato:Ingegneria Chimica
Ciclo di dottorato:XX
Numero di sistema:1846
Depositato il:21 Maggio 2008
Ultima modifica:04 Febbraio 2009 09:46

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