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Viscoelastic and rheological properties of nanocomposite-forming solutions based on gelatin and montmorillonite

2013; Elsevier BV; Volume: 120; Linguagem: Inglês

10.1016/j.jfoodeng.2013.07.007

1873-5770

Manuel Fernando Coronado Jorge, Christian Humberto Caicedo Flaker, Samira Fernandes Nassar, Izabel Cristina Freitas Moraes, Ana Mônica Quinta Barbosa Bittante, Paulo José do Amaral Sobral,

Blood properties and coagulation

Interested in developing gelatin-based nanocomposites using a spreading technique, this research aimed to study the effect of nanoparticles concentration on the rheological properties of nanocomposite-forming solutions (NFS) based on gelatin and montmorillonite (MMT). The NFS were produced with 5 and 8 g gelatin/100 g NFS; 30 g glycerol/100 g gelatin and 0, 5, 10 and 15 g MMT/100 g gelatin. Rheological tests were carried out in an AR2000 rheometer. Also, the dispersions of MMT in water were analyzed to determine the pH, the mean diameter, and the ζ-potential. The MMT concentration affected significantly the mean diameter of the dispersed nanoparticles, but only affected the ζ-potential for the 5% gelatin system. The MMT dispersions presented Newtonian behavior with low viscosity. The NFS presented viscoelastic behavior. The sol–gel and gel–sol transition temperatures were affected by the MMT concentration. Moreover, the NFS in the sol domain presented a non-Newtonian behavior affected by the MMT concentration.