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Varaprasad K.,Center for Advanced Polymer Research | Sadiku R.,Tshwane University of Technology
Journal of Applied Polymer Science | Year: 2015

In this scientific work, a novel class of antimicrobial nanocomposite hydrogels were designed and synthesized by chemical and environmentally bioprocess using Kolliphor, acrylamide, and mint leafs in order to achieve antiseptic property for wound applications. In the bioprocess approach, silver nitrate and gold chloride were nucleated with mint leafs in order to obtain effective free individual nano-inorganic compounds to provide superior antibacterial assets. The formations of dual inorganic nanoparticles were confirmed by transmission electron microscopy, which indicated the size of nanoparticles in the range of approximately 3 ± 2 nm and without agglomeration. The formations of biomaterials were characterized using Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopic-energy dispersive spectrometric studies and their swelling properties were determined. Furthermore, the pure hydrogel and the dual inorganic nanocomposite hydrogels developed were tested for antibacterial activities. When compared with the neat hydrogel, the nanocomposite hydrogels significantly improved their anti-bacterial activities on Bacillus bacterium. © 2015 Wiley Periodicals, Inc. Source


Briones R.,Center for Advanced Polymer Research | Torres L.,Center for Advanced Polymer Research | Saravia Y.,Center for Advanced Polymer Research | Serrano L.,University of the Basque Country | Labidi J.,University of the Basque Country
Industrial Crops and Products | Year: 2015

Agricultural residues (corn stover, corncob, vine shoots and blueberry tree pruning) with low added value were converted through liquefaction into liquefied products. Their capability to form films was evaluated. Results indicated that liquefied products production under liquefaction conditions is completely feasible with yields in the case of corn residues above 90%. The IOH and viscosities were in the range of 309-441mg of KOH/g and 0.16-0.19Pa·s, respectively. These values make the liquefied agricultural residues an interesting alternative to be considered as constituent in liquefied-based materials and composites elaboration. On the other hand, homogeneous, opaque and dark brown flexible films, using weight ratio of (liquefied agricultural residue/starch)/glycerol of (90/10)/30, were produced. The films obtained with corn residues as starting material showed adequate behavior considering physical and mechanical features. DMA measurements for liquefied corncob-films showed higher values of thermal and dynamic mechanical parameters (Tg: 112°C; E': 42MPa until 110°C) compared to control film (starch/glycerol: 70/30), which showed a material with higher thermal stability. The results demonstrated the suitability in the conversion of different renewable and abundant resources into liquid form and their physico-chemical properties for first step film production, which might have interesting perspectives in polymer processing area for bioplastics development in agricultural applications. © 2015 Elsevier B.V. Source

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