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    Microstructure and physical properties of nano-biocomposite films based on cassava starch and laponite

    Year: 2018

    Journal: Int. J. Biol. Macromol., Volume 107, FEB, page 1576–1583

    Authors: Valencia, German Ayala; Luciano, Carla Giovana; Lourenco, Rodrigo Vinicius; do Amaral Sobral, Paulo Jose

    Organizations: Sao Paulo Research Foundation (FAPESP) [2012/24047-3, 2013/07914-8]

    Keywords: Gloss; Image analysis; Nano-biocomposite films; Microstructure; Water contact angle

    The aim of this research was to study the effects of laponite concentrations on some properties of nano-biocomposite films based on cassava starch, focusing mainly the relation between the properties of the surface microstructure and roughness, water contact angle and gloss. Nano-biocomposite films were produced by casting. We analyzed gloss, color, opacity, water contact angle, crystallinity by X-ray diffraction, and microstructure by scanning electron microscopy and atomic force microscopy. Texture parameters (energy, entropy and fractal dimension) were extracted from micrographs. We observed a great impact of laponite in the morphology of nano-biocomposite films. Texture parameters correlated with surface heterogeneity and roughness. Finally, surface roughness affected the surface hydrophilicity of nano-biocomposite films. Laponite platelets were exfoliated and/or intercalated with amylose and amylopectin chains. This research reports new information on the effects of laponite concentrations on the morphological, optical and wetting properties of nano-biocomposite films aiming future industrial applications. (C) 2017 Elsevier B.V. All rights reserved.
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