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Environmentally-safe bimetallic Ag@Co magnetic nanocomposites with antimicrobial activity

“…The preparation of NCs was based on IMS of core-shell MNPs. Non-woven fibrous ion-exchange materials FIBAN K-1 (sulfonated polypropylene fibre copolymerized with styrene and divinylbenzene) and FIBAN K-4 (carboxylated polypropylene fibre copolymerized with acrylic acid) 5 were used as polymeric matrices (from Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus).…”

Environmentally-Safe Catalytically Active and Biocide Polymer-Metal Nanocomposites with Enhanced Structural Parameters

“…Therefore, the desired distribution of MNPs inside stabilizing polymer can be achieved by using the Donnan exclusion driven IMS of MNPs in the functional polymers (e.g., ion-exchangers materials). The use of IMS coupled with Donnan exclusion effect allows the most favourable distribution of MNPs inside respective nanocomposites making them maximally accessible for the bacteria to be eliminated or reactants to be catalyzed (Alonso et al, 2010;Medyak, 2001;Yegiazarov, 2000). Borohydride is one of the most often selected reducing agents for the synthesis of various MNPs, however in certain cases, e.g.…”

“…Therefore, they can serve as a magnetic core in core@shell MNPs, in which the shell consists of the metal with the desired activity (catalytic or bactericide). Core@shell MNPs of this type can be easily prepared by using IMS technique (Macanás et al, 2011) and the resulting nanocomposites can be applied in catalysis or water treatment (Medyak, 2001). In catalysis, for instance, due to the magnetic properties of MNPs, the nanocomposites can be easily recovered and reused in sequential catalytic cycles, which is particularly important for MNPs containing platinum group metals.…”

“…In fact, the synthesis of new nanocomposite materials based on the synthesis of polymerimmobilized bi-and poly-metallic NPs with core@shell architecture consisting of a low-cost magnetic (ferromagnetic or super-paramagnetic) core coated with a functional shell (having, for example, catalytic or bactericidal properties) is of particular interest for many advanced applications (Corain & Kralik, 2000;Medyak, 2001;Muraviev et al, 2008a). It is also important to emphasize that in some cases the performance of such nanocomposite materials in their practical application can be comparable to (or often even better than) that of their monometallic analogs (containing shell-metal NPs).…”

“…Supported Pd-MNPs embedded in polyelectrolyte films, beads or fibers can be easily prepared by employing the IMS technique (Alonso et al, 2010;Ouyang et al, 2010). Certain types of Pd-PSMNPs synthesized by IMS have been tested as catalysts for the Suzuki reaction (Medyak, 2001), which is a cross coupling reaction between arylboronic acids and aryl halides leading to the formation of biphenyls (Niembro et al, 2008). However, bimetallic catalysts such as alloy MNPs or core@shell MNPs are of particular interest for several reasons: i) the combination of two metals may provide control over catalytic activity, selectivity and stability, and ii) by controlling the thickness of a catalytically-active shell, one can improve the "catalytic atom economy" (Baranchikov, 2007).…”