5 years ago

Modulating the Catalytic Activity of Cerium Oxide Nanoparticles with the Anion of the Precursor Salt

Modulating the Catalytic Activity of Cerium Oxide Nanoparticles with the Anion of the Precursor Salt
Shashank Saraf, Sudipta Seal, Ankur Gupta, Rameech Mccormack, Michael D. Sevilla, Nicholas Eliason, Alex Petrovici, Soumen Das, Craig Neal, Julian Ortiz, Swetha Barkam, Amitava Adhikary, Cameron Hanson
In this work, we tested our hypothesis that surface chemistry and antioxidant properties of cerium nanoparticles (CNPs) are affected by the presence of counterions. We first employed various precursor cerium(III) (Ce(III)) salts with different counterions (acetate, nitrate, chloride, and sulfate) to synthesize CNPs following the same wet chemical methodology. Electron spin resonance (ESR) studies provided evidence for the formation of radicals from counterions (e.g., NO32 from reduction of NO3 in CNPs synthesized from Ce(III) nitrate). Physicochemical properties of these CNPs, e.g., dispersion stability, hydrodynamic size, signature surface chemistry, superoxide dismutase (SOD)-mimetic activity, and oxidation potentials, were found to be significantly affected by the anions of the precursor salts. CNPs synthesized from Ce(III) nitrate and Ce(III) chloride exhibited higher extent of SOD-mimetic activities. Therefore, these CNPs were studied extensively employing in situ ultraviolet (UV)–visible spectroelectrochemistry and changing the counterion concentrations affecting the oxidation potentials of these CNPs. Thus, the physicochemical and antioxidant properties of CNPs can be modulated by anions of the precursor. Furthermore, our ESR studies present evidence of the formation of guanine cation radical (G+) in 5′-dGMP via UV-photoionization at 77 K in the presence of CNPs synthesized from Ce(III) nitrate and chloride, and CNPs act as the scavenger of radiation-produced electrons.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b05725

DOI: 10.1021/acs.jpcc.7b05725

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.