Ag/C:F Antibacterial and hydrophobic nanocomposite coatings

Abstract

Silver-based nanomaterials that exhibit antibacterial character are intensively studied as they represent promising weapon against multi-drug resistant bacteria. Equally important class of materials represent coatings that have highly water repellent nature. Such materials may be used for fabrication of anti-fogging or self-cleaning surfaces. The aim of this study is to combine both of these valuable material characteristics. Antibacterial and highly hydrophobic Ag/C:F nanocomposite films were fabricated by means of gas aggregation source of Ag nanoparticles and sputter deposition of C:F matrix. The nanocomposite coatings had three-layer structure C:F base layer/Ag nanoparticles/C:F top layer. It is shown that the increasing number of Ag nanoparticles in produced coatings leads not only in enhancement of their antibacterial activity, but also causes substantial increase of their hydrophobicity. Under optimized conditions, the coatings are super-hydrophobic with water contact angle equal to 165[Formula: see text] and are capable to induce 6-log reduction of bacteria presented in solution within 4[Formula: see text]h.

Plasma polymerized C:H:N:O thin films for controlled release of antibiotic substances

“…There already exist several methods working on such principle . Some of them are based on a release of metal ions like Ag + and Cu + which are known for their antibacterial effects . Unfortunately, long‐term exposure of these metals, even in small doses, can have negative effects on the living body …”

“…[12][13] Some of them are based on a release of metal ions like Ag + and Cu + which are known for their antibacterial effects. [14][15][16][17][18][19][20] Unfortunately, long-term exposure of these metals, even in small doses, can have negative effects on the living body. [21] An alternative approach is the immobilization of antibiotics or other antibacterial biomolecules directly on the surface.…”

Superwettable antibacterial textiles for versatile oil/water separation

“…The superhydrophobic fabric prevents water permeation through its diffusion layer restricting the interaction of Cu NPs with an aqueous medium. Hence much lower ion release is achieved and a smaller number of Cu ions could reach the bacteria …”

State-of-the-Art, and Perspectives of, Silver/Plasma Polymer Antibacterial Nanocomposites

“…This was confirmed by Blanchard et al [ 99 ] who studied water penetration into ppHMDSO and SiO x thin films by means of neutron reflectometry. However, recent results of Kylian et al [ 100 ] showed that even for highly hydrophobic C:F top layers (water contact angles of prepared coatings up to 165°), a strong antibacterial character of the coatings may still be observed when only a thin C:F layer (10 nm) is used. Such a result suggests that coating wettability is not the only parameter, and that the morphology of the coatings—especially the presence of crevices and defects in the overcoat layer which make Ag NPs accessible by water—has to be considered as well.…”