Gram-scale synthesis of splat-shaped Ag-TiO2 nanocomposites for enhanced antimicrobial properties

The control over contagious diseases caused by pathogenic organisms has become a serious health issue. The extensive usage of antibiotics has led to the development of multidrug-resistant bacterial strains. In this regard, metal-oxide-based antibacterial nanomaterials have received potential research interest due to the efficient prevention of microorganism growth. In this study, splat-shaped Ag-TiO₂ nanocomposites (NCs) were synthesized on the gram scale and the enhanced antibacterial properties of TiO₂ in the presence of silver were examined. The formation of Ag-TiO₂ NCs was analyzed through various characterization techniques. The cell viability experimental results demonstrated that the Ag-TiO₂ NCs have good biocompatibility. The antibacterial activity of the prepared Ag-TiO₂ NCs was tested against the Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli) bacterial strains. The Ag-TiO₂ NCs exhibited promising and superior antibacterial properties compared to TiO₂ nanospheres as confirmed by the bacterial growth and inhibition zone. The improvement in the antibacterial activity was attributed to the synergistic effect of the hybrid nature of TiO₂ nanoparticles in the presence of Ag.

Au-PDA@SiO2 core-shell nanospheres decorated rGO modified electrode for electrochemical sensing of cefotaxime

In this work, we have successfully synthesized core-shell structured Au-PDA@SiO2 nanospheres and decorated on reduced graphene oxide (rGO) modified glassy carbon electrode for the electrochemical detection of cefotaxime. The one-pot hydrothermal method was used to synthesis core-shell nanostructures by loading Au nanoparticles on polydopamine (PDA) coated SiO2 nanospheres. The as-prepared Au-PDA@SiO2 nanospheres were used to fabricate electrochemically reduced graphene oxide (rGO) modified glassy carbon electrode (Au-PDA@SiO2/rGO/GCE) for electrochemical determination of cefotaxime. Scanning electron microscopy, powder x-ray diffraction, transmission electron microscopy, and Fourier-transform infrared spectroscopy were used to confirm the structure and morphology of the as-prepared nanospheres. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were performed for electrochemical characterizations different modified electrodes. It was revealed that the nanocomposite modified electrodes exhibited excellent electrochemical performances for electrooxidation of target analytes and could achieve ultra-sensitive detections. A linear relationship was observed between peak currents and concentrations in the ranges of 1.0 × 10-9 to 5.0 × 10-8 M (R2 = 0.9877), and 1.0 × 10-7 to 5.0 × 10-6 M (R2 = 0.9821) for cefotaxime with a detection limit (S/N = 3) of 1.0 × 10-10 M. It can be deduced that the proposed sensor is suitable for the sensitive detection of cefotaxime in pharmaceutical samples.

Investigation on pH-switchable (itaconic acid/ethylene glycol/acrylic acid) based polymeric biocompatible hydrogel

A new variety of pH-sensitive polymeric hydrogels (IAE) have been developed and evaluated as biocompatible hydrogels using synergetic combinations of itaconic acid (IA), acrylic acid (AA), and ethylene glycol (EG) in water medium by free radical polymerization.

Enhancement of photo-catalytic degradation of formaldehyde through loading anatase TiO2and silver nanoparticle films on wood substrates

Since formaldehyde is considered to be a potential risk for human health, its emission must be eliminated in an effective way.

Template-induced synthesis and superior antibacterial activity of hierarchical Ag/TiO2composites

Hierarchical Ag/TiO₂composites were successfully synthesizedviahydrated magnesium carbonate hydroxide template-induced route, which exhibit superior and long-term antimicrobial activity.

Synthesis of porous MgAl2O4 spinel and its superior performance for organic dye adsorption

Hierarchical and porous MgAl₂O₄ spinel with excellent absorption performance has been synthesized via a facile hard template process.