Os géis de poliacrilamida com nanopartículas superparamagnéticas dispersas foram preparados através do método de co-precipitação em matrizes de gel aquoso do polímero. Os materiais resultantes, todos com propriedades superparamagnéticas, tinham tamanho de cristalito dependente da concentração de PAM: quanto maior o conteúdo do gel de poliacrilamida, menor o tamanho de cristalito. Reometria, espectroscopia IRTF, DRX e MEV indicaram que essa diminuição foi resultado de dois fatores:
i. Fator termodinâmico: à medida que a concentração de PAM aumenta, a energia superficial diminui, resultando em um tamanho crítico menor para a segregação de nanopartículas;
ii. Fator cinético: a taxa de crescimento de partículas é proporcional ao coeficiente de difusão das espécies reagentes: como os íons Fe interagem fortemente com o PAM na matriz aquosa, a difusão das espécies reagentes é desfavorecida, além disso, como o coeficiente de difusão é inversamente proporcional à viscosidade, o simples aumento da viscosidade (como resultado do aumento na concentração de PAM) teria o mesmo resultado.
Finalmente, o método utilizado neste trabalho pode ser considerado uma alternativa promissora e de baixo custo para a produção de géis PAM/Fe3O4 com
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