Preparation of PS/PVP/TiO<sub>2</sub> Core–Shell Particles Under Various Reaction Factors

Lee, Ki Chang

doi:10.1166/jnn.2019.17031

Cited by 3 publications

(1 citation statement)

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“…The morphology of the particles is similar to that of non-sulfonated polystyrene beads (SEM data not shown). Thus, if shape and size of the beads are retained during the reaction, the question arises whether they have been in fact transformed into the gel-shell particles [27,28]. To answer this question FTIR spectroscopy has been employed.…”

Section: Preparation and Physicochemical Characterization Of Silver-dmentioning

confidence: 99%

Silver-decorated gel-shell nanobeads: physicochemical characterization and evaluation of antibacterial properties

Bartel¹,

Markowska²,

Strawski³

et al. 2020

Beilstein J. Nanotechnol.

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We report on the synthesis of composite nanobeads with antibacterial properties. The particles consist of polystyrene cores that are surrounded by sulfonic gel shells with embedded silver nanoparticles. The nanocomposite beads are prepared by sulfonation of polystyrene particles followed by accumulation of silver ions in the shell layer and subsequent reduction with sodium borohydride. The resulting material has been characterized by electron microscopy, vibrational and X-ray photoelectron spectroscopy and several other experimental techniques. It was shown that sodium borohydride reduces silver ions embedded in the gel layer producing silver nanoparticles but also transforms a fraction of sulfonic groups in the polymer to moieties with sulfur in a lower oxidation state, likely thiols. It is hypothesized that the generated thiol groups are anchoring the nanoparticles in the gel shell of the nanobeads stabilizing the whole structure. The silver-decorated nanobeads appear to be a promising material with considerable antimicrobial activity and were tested against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Staphylococcus epidermidis. The determined minimum inhibitory (MIC) and minimum biofilm inhibitory (MBIC) concentrations are comparable to those of non-incorporated silver nanoparticles.

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Section: Preparation and Physicochemical Characterization Of Silver-dmentioning

confidence: 99%