Caracterização de soluções de quitosana por espalhamento dinâmico de luz
Dynamic light scattering was used to monitor relaxation processes in chitosan solutions at concentrations within the semi-dilute and concentrated regimes, Kowhlrausch-Williams-Watts (KWW) equation being successfully fitted to intensity correlation function data. The dependence of KWW equation par...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/17662 |
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| Resumo: | Dynamic light scattering was used to monitor relaxation processes in chitosan
solutions at concentrations within the semi-dilute and concentrated regimes,
Kowhlrausch-Williams-Watts (KWW) equation being successfully fitted to intensity
correlation function data. The dependence of KWW equation parameters on chitosan
concentration indicated that an increase in concentration from semi-dilute to
concentrated regimes resulted in narrowing the distribution of relaxation rates;
temperature dependence indicated the relaxation process as described as an energy
activated process, whose parameters were function of the interaction between chitosan
chains (enthalpy of activation) and rigidity of chitosan conformations (pre-exponential
factor) |
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