Aerogels based on graphene oxide (GO) and gelatin (G) are materials of widespread interest due to their high absorption capacity and low density. It had been used in different fields as water treatment, biomedicine, among others. One of their main properties is their surface charge since it allows different types of interactions related to the adsorption phenomena. Therefore is important to understand the aerogels synthesis, to promote adequate surface properties, which can be useful to different applications, as metal remotion or blood clotting. In order to address this aim, different aerogels were developed applying a factorial experimental design considering interactions of type covalent or noncovalent. The influence of the variables pH on GO suspensión on GO:G ratio was evaluated. The response considered was the zeta potential. It was possible to synthesize aerogels with covalent and noncovalent interactions between GO-G (confirmed by FTIR and XPS analysis). To the different synthesis conditions studied, their surface charge did not show differences ( -20.5 &lt;ξ&lt;16.5 mV; p-value=0.2105), among the two type of interactions GO-G developed. It was possible to know the isoelectric point of the aerogels, based on the different combination of variables (pH and GO:G ratio), coming from the response surface. With this results, the synthesis of GO:G aerogels for different applications could be more efficient and effective due to a predictable surface charge, favorable according to the final purpose of synthesis.

Study of surface charge on gelatin-graphene oxide aerogels

2019 Spring National Meeting

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