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Synthesis of Multi-walled Carbon Nanotubes Modified with Silver Nanoparticles and Evaluation of Their Antibacterial Activities and Cytotoxic Properties
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Tunable Silver-Functionalized Porous Frameworks for Antibacterial Applications.

Mark A Isaacs1, Brunella Barbero2, Lee J Durndell3

  • 1Department of Chemistry, University College London, London WC1H 0AJ, UK. mark.isaacs@ucl.ac.uk.

Antibiotics (Basel, Switzerland)
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Summary
This summary is machine-generated.

Modified silver nanocomposites show enhanced antibacterial properties against drug-resistant bacteria. Tailoring silica host matrices improves silver nanoparticle dispersion, boosting efficacy against pathogens like MRSA and C. difficile.

Keywords:
antibacterialmacroporousmesoporoussilversurface functionalizationtitania

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Infectious Diseases

Background:

  • Healthcare-associated infections and antibiotic resistance are critical global health challenges.
  • Silver nanocomposites offer a promising alternative to conventional antibiotic therapies.
  • Understanding structure-function relationships is vital for optimizing silver nanocomposite efficacy.

Purpose of the Study:

  • To synthesize and characterize chemically and structurally modified mesoporous SBA-15 silicas as host matrices for silver nanoparticles.
  • To investigate how modifications to the silica matrix influence silver nanoparticle dispersion and silver ion release.
  • To correlate the concentration of silver carbonate (Ag₂CO₃) with antibacterial efficacy against key pathogens.

Main Methods:

  • Synthesis of modified mesoporous SBA-15 silica host matrices.
  • Physicochemical characterization using TEM, XRD, XPS, XANES, and porosimetry.
  • Assessment of silver nanoparticle dispersion, Ag₂CO₃ formation, and ionic silver release in simulated tissue fluid.
  • Evaluation of antibacterial activity against pathogens including *C. difficile* and MRSA.

Main Results:

  • Titania monolayer functionalization and macroporosity incorporation enhanced silver nanoparticle dispersion within the silica matrix.
  • Modified matrices promoted Ag₂CO₃ formation and increased ionic silver release.
  • Higher Ag₂CO₃ concentration correlated strongly with improved antibacterial efficacy.

Conclusions:

  • Chemically and structurally modified SBA-15 silica matrices effectively tune silver nanoparticle properties.
  • Optimized silver nanocomposites demonstrate significant potential for combating drug-resistant bacterial infections.
  • This study provides a foundation for developing advanced silver-based antimicrobials.