Abstract
The preparation and study of tailored materials with few nanometers in size are crucial challenges for contemporary material science and engineering; especially, for materials with high surface tension such as silver, which exhibit enhanced chemical and biological activities. In the present article, a facile synthesis of nanoscopic ascorbic acid matrixes embedding and stabilizing uniform ultrafine silver nanoparticles is presented. The procedure consists in the reduction of Ag+ ions of an aqueous solution of silver nitrate at 70 °C using water solutions of ascorbic acid (vitamin C) with concentrations higher than those explored in previous investigations. The resulting samples were characterized by different analytical techniques including transmission electron microscopy, X-ray diffraction and UV–visible and infrared spectroscopies. These studies revealed that they are constituted by nanometric matrixes of vitamin C with an elongated morphology (lengths from 120 to 200 nm and widths between 30 and 70 nm), which contain unusually small silver nanoparticles with a mean diameter of 2.2 ± 0.7 nm. The tests for the bactericidal activity of this nanostructured hybrid material show improved antimicrobial activity against both Gram-positive and Gram-negative bacteria.
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Acknowledgements
The authors acknowledge financial support from Secretaría de Educación Pública (SEP, Mexico) and Universidad Autónoma de Nuevo León (UANL) under research projects: “Red temática de colaboración académica: Sistemas de baja dimensionalidad con aplicaciones biotecnológicas” and “PAICyT-2015”, respectively. C. Luna thanks National Council of Science and Technology of Mexico (Consejo Nacional de Ciencia y Tecnología, CONACYT) for a sabbatical fellowship (ref. 215416).
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Luna, C., Cruz-Martínez, G., Barriga-Castro, E.D. et al. Synthesis, Characterization and Improved Bactericide Activity of Ellipsoidal Nanoscopic Ascorbic Acid Matrixes Embedding Ultrafine Silver Nuclei. J Clust Sci 29, 425–430 (2018). https://doi.org/10.1007/s10876-018-1340-3
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DOI: https://doi.org/10.1007/s10876-018-1340-3