Continuous nucleation of metallic nanoparticles photocatalytic reduction.

Whether in organic synthesis or solar energy conversion, light can be a powerful reagent in chemical reactions and introduce new opportunities for synthetic control including duration, intensity, interval, and energy of irradiation. Here, we report the use of a molecular photosensitizer as a reducing agent in metallic nanoparticle syntheses. Using this approach, we report three key findings.

Multimetallic post-synthetic modifications of copper selenide nanoparticles.

In this report, we investigate the addition of two metal cations, simultaneously and sequentially to CuSe nanoparticles. The metal combinations (Ag-Au, Ag-Pt, Hg-Au and Hg-Pt) are chosen such that one metal adds to the structure cation exchange and the other adds to the structure metal deposition when added individually to CuSe nanoparticles. Surprisingly, we find that for each metal combination, across all three synthesis routes, cation exchange and metal deposition products are obtained without deviation from the outcomes seen in the binary metal systems.

Connecting Cation Exchange and Metal Deposition Outcomes via Hume-Rothery-Like Design Rules Using Copper Selenide Nanoparticles.

Heterogenous nanomaterials containing various inorganic phases have far-reaching impacts both from the physical phenomena they reveal and the technologies they enable. While the variety and impact of these materials has been demonstrated in many reports, there is critical ambiguity in the factors that lead to major bifurcations in developing these heterostructures, for example, the formation of either mixed metal semiconductors or segregated metal-semiconductor phases. Here, we compare outcomes of independently introducing 5 different metal cations (Au, Ag, Hg, Pd, and Pt) to antifluorite copper selenide (CuSe) nanoparticles (diameter = 52 ± 5 nm).

Staphylococcal catalase regulates its virulence and induces arthritis in catalase deficient mice.

To figure out whether in vivo expression of Staphylococcal catalase could correlate with the virulence and pathogenicity of the bacteria in the catalase deficient Swiss albino mice. 3 Amino 1, 2, 4 triazole (ATZ) (2 mg/g body wt) treated catalase deficient mice were infected with virulent S. aureus and bacterial burden, antioxidant enzyme levels were estimated after 3, 5 and 10 days of infection.