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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Silver Nanoparticles Stabilised by Cationic Gemini Surfactants with Variable Spacer Length.

Martin Pisárčik1, Josef Jampílek2, Miloš Lukáč3

  • 1Department of Chemical Theory of Drugs, Faculty of Pharmacy, Comenius University, Kalinčiakova 8, Bratislava SK-83232, Slovakia. pisarcik@fpharm.uniba.sk.

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Summary

This study synthesized silver nanoparticles using cationic gemini surfactants. These nanoparticles show enhanced microbicidal activity against Gram-negative bacteria and yeasts, linked to their interaction with cell membranes.

Keywords:
gemini surfactantmicrobicidal activitynanoparticle stabilitysilver nanoparticlesurfactant spacer

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biochemistry

Background:

  • Silver nanoparticles (AgNPs) exhibit potent antimicrobial properties.
  • Stabilization of nanoparticles is crucial for controlling their physicochemical and biological characteristics.
  • Gemini surfactants offer unique properties for nanoparticle stabilization.

Purpose of the Study:

  • To synthesize and characterize silver nanoparticles stabilized by cationic gemini surfactants with varying spacer lengths.
  • To investigate the impact of gemini surfactant structure on AgNP properties.
  • To evaluate the microbicidal efficacy of the developed AgNPs.

Main Methods:

  • Synthesis of AgNPs stabilized with gemini surfactants.
  • Physicochemical characterization using UV-VIS spectroscopy, dynamic light scattering (DLS), scanning electron microscopy (SEM), and zeta potential measurements.
  • Microbicidal activity assays against Gram-negative bacteria and yeasts.

Main Results:

  • AgNPs synthesized ranged from 50-115 nm, with smaller populations observed with short or long gemini spacers.
  • Zeta potential remained stable at approximately +58 mV, independent of spacer length.
  • AgNPs demonstrated enhanced efficacy against Gram-negative bacteria and yeasts.

Conclusions:

  • Cationic gemini surfactants effectively stabilize silver nanoparticles.
  • The structure of the gemini surfactant influences AgNP size distribution.
  • The enhanced microbicidal activity is attributed to the interaction mechanism with bacterial cell membranes.