Here, we report the synthesis, characterization, and properties of novel nanohybrids formed by self-assembly of negatively charged MoS 2 nanoplates and positively charged iron oxide nanoparticles (NPs) of two different sizes, 5.1 and 11.6 nm. Iron oxide NPs were functionalized with an amphiphilic random copolymer, quaternized poly(2-(dimethylamino)ethyl metacrylate-co-stearyl metacrylate), synthesized for the first time using atom transfer radical polymerization. The influence of the MoS 2 fraction and the iron oxide NP size on the structure of the nanohybrids has been studied. Surprisingly, larger NPs retained a larger fraction of the copolymer, thus requiring more MoS 2 nanoplates for charge compensation. The nanohybrid based on 11.6 nm NPs was studied in oxidation of sulfide ions. This reaction could be used for removing the dangerous pollutant from wastewater and in the production of hydrogen from water using solar energy. We demonstrated a higher catalytic activity of the NP/MoS 2 nanohybrid than that of merely dispersed MoS 2 in catalytic oxidation of sulfide ions and facile magnetic recovery of the catalyst after the reaction.

Synthesis of polystyrene-block-polybutadiene (PS-b-PB) and polystyrene-block-polyisobutylene (PS-b-PIB) micelles filled with MoS x nanoparticles was carried out in a one-pot procedure in heptane using complexation with Mo(CO) 6 followed by interaction with H 2 S. The structure and composition of Mo carbonyl complexes and MoS x -containing micelles were studied using FTIR, static light scattering, turbidimetry, and transmission electron microscopy. By varying the reaction atmosphere (argon or CO) during interaction with Mo(CO) 6 , the location of MoS x species obtained after sulfiding was tailored. Carrying out complexation with PS-b-PB in CO, which is also a reaction product, prevents complexation in the PS micelle core, thus providing location of Mo species only in the PB corona. Antifrictional tests show that this location leads to better tribological performance: lower friction coefficient or higher critical load (at which the friction coefficient is measured). When MoS x species are located in the PS core (complexation with Mo(CO) 6 was carried out in argon atmosphere), low density of the micelles in the case of PS-b-PIB block copolymer with a short PS block provides much better antifrictional performance than those with the dense PS-b-PB micelles.

SUMMARY Novel Pt-containing polymers derived from Zeise salt and polystyrene-polybutadiene diblock (PS-PB) and triblock (SBS) copolymers have been synthesized. The comparison of complex formation peculiarities of Pd-, Rh-, and Pt-containing polymers derived from SBS with 72 wt.-% of PB and PS-PB with 15 wt.-% of PB displayed that a short PB block in PS-PB allows to maintain solubility of organometallic polymers even if intermolecular complexation is probable. Such a solubility was found to be provided by micellization in Pd-, Pt-, and Rh-containing polymers derived from PS-PB. Moreover, crosslinks formed due to complexation were shown to contribute to micellization: iron carbonyl complexes immobilized on PS-PB, where solely intramolecular complexes can be formed, do not provide micellization.

No abstract