Keywords
espectroeletroquímica
voltametria cíclica
montmorilonita
azul de metileno
filmes
eletrodos modificados
How to Cite
Abstract
O comportamento eletroquímico e espectroeletroquímico do sistema montmorilonita-azul demetileno (MM-AM)/AM solução foi investigado empregando-se a técnica de voltametria cíclica e de
transiente, I x t (corrente versus tempo) sobre eletrodo de vidro ITO modificado pela deposição mecânica
de filmes do compósito MM-AM. Os filmes foram preparados empregando três procedimentos: 1- na
ausência de CTACl (surfactante, cloreto de cetiltrimetilamônio); 2- com incorporação do CTACl à região
interlamelar; e 3- na presença do CTACl, porém, não incorporado à região interlamelar. A técnica
espectrofotométrica foi empregada para a caracterização e para o estudo eletrocrômico dos filmes formados.
Os resultados experimentais permitiram observar que: i- os filmes preparados com a incorporação prévia
do AM a região interlamelar fornecem uma resposta eletroquímica mais eficiente com o aparecimento de
um par de picos bem definido; ii- a adição do CTACl, de forma geral permite a obtenção de filmes
mecanicamente mais estáveis; iii- com a inclusão prévia do CTACl na região interlamelar não ocorre o
aparecimento da forma protonada do AM (AMH + ); iv- na ausência da forma protonada o compósito não
apresenta comportamento eletrocrômico.
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