Silver nanoparticles nucleated in NaOH treated halloysite: a potential antimicrobial material.

  1. Yuri B. Matos,
  2. Rodrigo S. RomanusORCID Logo,
  3. Mattheus Torquato,
  4. Edgar H. de Souza,
  5. Rodrigo L. VillanovaORCID Logo,
  6. Marlene SoaresORCID Logo and
  7. Emilson R. VianaORCID Logo

Submitting author affiliation: Departamento Acadêmico de Física, Universidade Tecnológica Federal do Paraná - UTFPR - Curitiba, Brazil, Curitiba, Brazil

Beilstein Arch. 2021, 202123. https://doi.org/10.3762/bxiv.2021.23.v1

Published 15 Mar 2021

  • Preprint

Abstract

Despite all recent advances in medical treatments, infectious diseases remain dangerous. This scenario has led to intense scientific research on materials with antimicrobial properties. Silver nanoparticles (Ag-NPs) are a well established solution in this area. The present work studied the nucleation of silver in halloysite substrates (HNT) modified by a NaOH chemical treatment. The resulting stabilized Ag-NPs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive x-ray spectroscopy (EDS). The nucleation was characterized by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Ag-NPs antimicrobial properties were investigated against \textit{E. coli} and \textit{S. aureus}. The potential of Ag-NPs for industrial application was tested by dispersing them into low density polyethylene (LDPE). The importance of the chemical affinity between matrix and additive was tested coating Ag-NPs with dodecanethiol, a non-polar surfactant. The resulting composites were characterized by scanning electron microscopy (SEM) and in terms of surface antimicrobial activity. The results demonstrate that Ag-NPs synthesized in this work are indeed antimicrobial, and that it is possible to imbue a polymeric matrix with the Ag-NPs antimicrobial properties.

Keywords: antimicrobial activity; silver nanoparticles; halloysite; DIO coating; nanocomposites;

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When a peer-reviewed version of this preprint is available, this information will be updated in the information box above. If no peer-reviewed version is available, please cite this preprint using the following information:

Matos, Y. B.; Romanus, R. S.; Torquato, M.; de Souza, E. H.; Villanova, R. L.; Soares, M.; Viana, E. R. Beilstein Arch. 2021, 202123. doi:10.3762/bxiv.2021.23.v1

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