Infrared absorption spectra studies in (NaNO<sub>3</sub>–NaNO<sub>2</sub>) system

The UV photolysis at lambda > or = 290 nm in air of a mixture of NaNO(2)/NaCl coated with 1-oleoyl-2-palmitoyl-sn-glycero-3-phosphocholine (OPPC) was followed in real time in the absence and presence of water vapor by using diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) at 23 degrees C. Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) was used to confirm the identification of the products. Photolysis of NO(2)(-) is known to generate O(-), which in the presence of water forms OH + OH(-). Irradiation of the OPPC/NaNO(2)/NaCl mixture led to a loss of nitrite and the formation of organic nitrates and carbonyl compounds. In the absence of added water vapor, carboxylate ions were also formed. These products are due to oxidation of OPPC by O(-) and OH radicals. The organic products formed per calculated O(-)/OH generated by photolysis increased with relative humidity, consistent with a competition between OPPC and NO(2)(-) for OH. This suggests a new mechanism of oxidation of organics on particles and on surfaces in air that have nitrite ions available for photolysis. Similar chemistry is likely to occur for nitrate ions, which also photolyze to generate O(-).

show abstract

Effect of Nanoparticles on the Thermal Stability and Reaction Kinetics in Ionic Nanofluids

Svobodova-Sedlackova

Huete-Hernández

Calderón

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

Nowadays, the incorporation of nanoparticles into thermal fluids has become one of the most suitable strategies for developing high-performance fluids. An unconventional improvement of thermo–physical properties was observed with the addition of 1% wt. of nanoparticles in different types of fluids, such as molten salts, allowing for the design of more thermally efficient systems using nanofluids. Despite this, there is a lack of knowledge about the effect that nanoparticles produce on the thermal stability and the decomposition kinetics of the base fluid. The present study performs IR- and UV-vis spectroscopy along with thermogravimetric analysis (TGA) of pure nitrate and nitrate based nanofluids with the presence of SiO2 and Al2O3 nanoparticles (1% wt.). The results obtained support that nanoparticles accelerate the nitrate to nitrite decomposition at temperatures below 500 °C (up to 4%), thus confirming the catalytic role of nanoparticles in nanofluids.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Infrared absorption spectra studies in (NaNO₃–NaNO₂) system

Cited by 3 publications

References 19 publications

Heat treatment effect on nanostructured sol-gel derived lanthania doped with chromium

Heat treatment effect on nanostructured sol-gel derived lanthania doped with chromium

Nitrite-Induced Oxidation of Organic Coatings on Models for Airborne Particles

Effect of Nanoparticles on the Thermal Stability and Reaction Kinetics in Ionic Nanofluids

Contact Info

Product

Resources

About

Infrared absorption spectra studies in (NaNO3–NaNO2) system

Cited by 3 publications

References 19 publications

Heat treatment effect on nanostructured sol-gel derived lanthania doped with chromium

Heat treatment effect on nanostructured sol-gel derived lanthania doped with chromium

Nitrite-Induced Oxidation of Organic Coatings on Models for Airborne Particles

Effect of Nanoparticles on the Thermal Stability and Reaction Kinetics in Ionic Nanofluids

Contact Info

Product

Resources

About

Infrared absorption spectra studies in (NaNO₃–NaNO₂) system