Water as the Solvent in the Stober Process for Forming Ultrafine Silica Shells on Magnetite Nanoparticles

Furlan, Ping Y.; Furlan, Alexander Y.; Kisslinger, Kim; Melcer, Michael E.; Shinn, David W.; Warren, John B.

doi:10.1021/acssuschemeng.9b03554

Title: Water as the Solvent in the Stober Process for Forming Ultrafine Silica Shells on Magnetite Nanoparticles

Journal Article · Thu Aug 29 00:00:00 EDT 2019 · ACS Sustainable Chemistry & Engineering

DOI:https://doi.org/10.1021/acssuschemeng.9b03554· OSTI ID:1583103

^[1]; Furlan, Alexander Y. ^[1]; Kisslinger, Kim ^[2]; Melcer, Michael E. ^[1]; Shinn, David W. ^[1]; Warren, John B. ^[2]

United States Merchant Marine Academy, Kings Point, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Silica coating of magnetite nanoparticles (MNPs) is of great importance since it offers MNPs stability against oxidation, water dispersity, and a tailorable surface for functionalities, allowing a wide range of applications in areas such as water pollutant removal and targeted drug delivery. In this work, a simple and green procedure has been developed using water, instead of traditional alcohols, as the solvent in the Stober method to produce well-dispersed MNPs coated with ultrathin (< 5 nm) silica outer shells. The resultant core-shell structures possess superparamagnetic properties, high magnetization value of 59 emu/g, and excellent resistance to oxidation when exposed to ultrasonic accelerated oxidation. The oxidation stability of the coated 2 MNPs is shown to extend to their functionalized product. All syntheses are carried out under ambient conditions using commonly available chemicals and equipment. In conclusion, the Fe₃O₄@SiO₂ core-shell structures are characterized using FTIR-ATR spectroscopy, Transmission Electron Microscopy (TEM), Energy Dispersive X-ray Spectroscopy (EDS), and a Vibrating Sample Magnetometer (VSM).

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1583103

Report Number(s):: BNL-213511-2020-JAAM; TRN: US2101062

Journal Information:: ACS Sustainable Chemistry & Engineering, Vol. 7, Issue 18; ISSN 2168-0485

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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