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Darka Marković,Jelena Ašanin,Tim Nunney,Željko Radovanović,Marija Radoičić,Miodrag Mitrić,Dušan Mišić,Maja Radetić 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
This study discusses the possibility of fabrication of textile nanocomposites with antimicrobial activity againstantibiotics-resistant bacterial strains and yeast. Modification of cotton fabric with oxalic acid solutions of differentconcentrations provided free carboxyl groups for binding of Cu2+-ions from copper (II) sulfate solution which were furtherreduced with sodium borohydride in alkaline solution. An increase in the concentration of applied oxalic acid resulted inlarger amounts of free carboxyl groups on the cotton fibers, Cu2+-ions uptake and total amounts of Cu-based nanoparticlesafter reduction. XPS and XRD analyses suggested that nanoparticles mainly consisted of CuO with fractions of Cu2O. Fabricated textile nanocomposites ensured maximum reduction of Gram-negative E. coli ATCC 25922, E. coli NCTC 13846,E. coli ATCC BAA-2469, K. pneumoniae ATCC-BAA 2146 and P. aeruginosa ATCC 27853, Gram-positive bacteria S. aureus ATCC 25923 and S. aureus ATCC 43300 and yeast C. albicans ATCC 24433. Additionally, controlled release ofCu2+-ions from fabrics into the physiological saline solution was obtained within 24 hours.
Electrochemical synthesis of nanosized hydroxyapatite/graphene composite powder
Vesna Mišković-Stanković,Sanja Eraković,Ana Janković,Maja Vukašinović-Sekulić,Miodrag Mitrić,Young Chan Jung,Soo Jin Park,Kyong Yop Rhee 한국탄소학회 2015 Carbon Letters Vol.16 No.4
Electrochemical synthesis was employed to prepare a novel hydroxyapatite/graphene (HAP/ Gr) composite powder suitable for medical applications as a hard tissue implant (scaffold). The synthesis was performed in a homogeneous dispersion containing Na2H2EDTA·2H2O, NaH2PO4 and CaCl2 with a Ca/EDTA/PO4 3− concentration ratio of 0.25/0.25/0.15M, along with 0.01 wt% added graphene nanosheets, at a current density of 137 mA cm−2 and pH value of 9.0. The field emission scanning electron microscopy and transmission electron microscopy observations of the composite HAP/Gr powder indicated that nanosized hydroxyapatite particles were uniformly placed in the graphene overlay. Raman spectroscopy, Fourier transform infrared spectroscopy and X-ray diffraction confirmed graphene incorporation in the HAP/Gr powder. The electrochemically prepared HAP/Gr composite powder exhibited slight antibacterial effect against the growth of the bacterial strain Staphylococcus aureus.
Lisinetskaya, Polina G.,Braun, Christian,Proch, Sebastian,Kim, Young Dok,Gantefö,r, Gerd,Mitrić,, Roland The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.9
<P>We present a joint theoretical and experimental study of excited state dynamics in pure and hydrated anionic gold clusters Au-3(-)[H2O](n) (n = 0-2). We employ mixed quantum-classical dynamics combined with femtosecond time-resolved photoelectron spectroscopy in order to investigate the influence of hydration on excited state lifetimes and photo-dissociation dynamics. A gradual decrease of the excited state lifetime with the number of adsorbed water molecules as well as gold cluster fragmentation quenching by two or more water molecules are observed both in experiment and in simulations. Non-radiative relaxation and dissociation in excited states are found to be responsible for the excited state population depletion. Time constants of these two processes strongly depend on the number of water molecules leading to the possibility to modulate excited state dynamics and fragmentation of the anionic cluster by adsorption of water molecules.</P>
Nemanja D. Bani c,Biljana F. Abramovi c,Jugoslav B. Krsti c,Daniela V. Šoji c Merkulov,Nina L. Fin9cur,Miodrag N. Mitri c 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.70 No.-
This work presents the characterization of novel synthesized WO3/Fe3O4 catalysts and investigates theirphotocatalytic activity for thiacloprid decomposition under UV and simulated sunlight radiation. FourWO3/Fe3O4 nanopowders with different amounts of WO3 were synthesized by chemical co-precipitationmethod. XRD analysis showed the presence of hematite and magnetite nano-dimensional phases ofFe3O4 in the catalysts. The magnetite phase content increased with increasing WO3 content. Degradationefficiency of thiacloprid in the presence of 6.1WO3/Fe3O4/H2O2 under simulated solar radiation was 2.2times higher compared to Fe3O4. Under an external magneticfield, a significant increase in the catalystsseparation from reaction mixture was observed.