Viscoelastic and rheological properties of nanocomposite-forming solutions based on gelatin and montmorillonite
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- 作者：Manuel Fern ; o Coronado Jorge ; Christian Humberto Caicedo Flaker ; Samira Fern ; es Nassar ; Izabel Cristina Freitas Moraes ; Ana M?nica Quinta Barbosa Bittante ; Paulo Jos¨¦ do Amaral Sobral
- 关键词：Dispersion ; Non-Newtonian behavior ; ¦Æ-Potential ; Mean diameter ; Nanoparticles
- 刊名：Journal of Food Engineering
- 出版年：2014
- 出版时间：January, 2014
- 年：2014
- 卷：120
- 期：Complete
- 页码：81-87
- 全文大小：717 K
文摘
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 ¦Æ-potential. The MMT concentration affected significantly the mean diameter of the dispersed nanoparticles, but only affected the ¦Æ-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.