Barrier, mechanical and morpho-structural properties of gelatin films with carbon nanotubes addition
Barrier, mechanical and morpho-structural properties of gelatin films with carbon nanotubes addition
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DOI：
10.1016/j.jfoodeng.2013.08.004
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发表时间：
2014
影响因子：
5.5
通讯作者：
M. A. Ortiz-Zarama;A. Jiménez–Aparicio;M. J. Perea-Flores;J. Solorza-Feria
中科院分区：
文献类型：
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作者：
M. A. Ortiz-Zarama;A. Jiménez–Aparicio;M. J. Perea-Flores;J. Solorza-Feria
研究了少量碳纳米管（CNT）对甘油明胶膜含水量和物理性能的影响。制备对照膜和具有0.001%（w/w）CNT添加的那些膜。水等温吸附和水蒸气渗透性，进行了评估的明胶膜的阻隔特性。拉伸强度和断裂伸长率用织构仪评价，而硬度和弹性模量用纳米压痕测试仪测量，所有这些测试都在22%、40%、58%和75%RH下测量。原子力，环境和场发射扫描电子显微镜，用于查看薄膜的形态结构。数据吸附等温线拟合以及所有尝试的模型。RH的增加降低了拉伸强度，并增加了所有膜的断裂伸长率。CNT的加入对膜的阻隔性能没有显著影响（p> 0.05），但在任何高于40%的RH下，它引起膜的断裂伸长率增加约11.36%;对拉伸强度和硬度没有影响。薄膜图像分析显示，具有高度有序的形态结构，这可能与CNT添加到蛋白质基质中有很好的相关性。发现CNT嵌入在聚合物基质中。
The effect of a small amount of carbon nanotubes (CNT) on the water content and physical properties of gelatin films with glycerol were evaluated. Control films and those with 0.001% (w/w) CNT addition were prepared. Water isotherms adsorption and water vapor permeability, were undertaken on the gelatin films to asses barrier characteristics. Tensile strength and elongation at break were evaluated with a texture meter, while hardness and elastic modulus were measured with a nanoindentation tester, all these tests were measured at 22%, 40%, 58% and 75% RH. Atomic force, environmental and field emission scanning electron microscopy, were used to see the films morpho-structure. The data adsorption isotherms fitted well all models tried. An increase in RH decreased the tensile strength, and increased the elongation at break of all films. The CNT addition did not affect significantly the films barrier properties (p> 0.05), but it caused an increase of about 11.36% on the elongation at break of films, at any RH higher than 40%; with no effect on the tensile strength and hardness. Films image analysis, showed a morpho-structure with high ordering, which might well correlate with CNT addition to the protein matrix. CNT were found embedded in the polymeric matrix.