Journal of Materials Science

, Volume 51, Issue 8, pp 3817–3823 | Cite as

Synthesis and characterization of an antibacterial powder based on the covalent bonding of aminosilane-stabilized silver nanoparticles to a colloidal silica

  • I. E. dell’Erba
  • A. Y. Mansilla
  • C. E. Hoppe
  • R. J. J. Williams
Original Paper
First Online:
Received:
Accepted:

Abstract

Stable dispersions of silver nanoparticles (Ag NPs) were synthesized employing glycerol as both a solvent and reducing agent, and 3-aminopropyl trimethoxysilane (APTMS) as a stabilizer. Average sizes varied between 13 and 55 nm, depending on the molar ratio of APTMS/Ag. Terminal alkoxysilanes reacted with OH groups of glycerol leading to the covalent bonding of glycerol moieties to the chain ends of the stabilizer. This produced extremely stable colloidal dispersions from which NPs could not be extracted with solvents immiscible with glycerol (as THF). Ag NPs were covalently bonded to the surface of a colloidal silica by hydrolysis/condensation of terminal Si–O–C bonds of the stabilizer with superficial SiOH bonds of silica. TEM images revealed the presence of individual NPs and small clusters of NPs attached to the silica surface. These clusters were presumably generated by intermolecular reactions among chain ends of the stabilizer producing Si–O–Si bonds. The antibacterial properties of the resulting powder were confirmed by conventional tests employing a culture of Escherichia Coli.

Keywords

Silver Nanoparticles Silica Surface Colloidal Silica Colloidal Dispersion Aminosilane 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgement

The financial support from the National Research Council (CONICET), the University of Mar del Plata and the National Agency for the Promotion of Science and Technology (ANPCyT), Argentina, is gratefully acknowledged. The authors wish to thank Giovani Pavoski and Prof. Griselda Barrera Galland for the ICP measurements at the UFRGS, Porto Alegre, Brazil.

Compliance with ethical standards

Conflict of interest

The authors declare no competing financial interest.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • I. E. dell’Erba
    • 1
  • A. Y. Mansilla
    • 2
  • C. E. Hoppe
    • 1
  • R. J. J. Williams
    • 1
  1. 1.Institute of Materials Science and Technology (INTEMA)University of Mar del Plata and National Research Council (CONICET)Mar del PlataArgentina
  2. 2.Biological Research Institute (IIB)University of Mar del Plata and National Research Council (CONICET)Mar del PlataArgentina

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