Observing the Colloidal Stability of Iron Oxide Nanoparticles in situ

Mehdi, BL ORCID: 0000-0002-8281-9524 (2019) Observing the Colloidal Stability of Iron Oxide Nanoparticles in situ. Nanoscale, 11 (27). pp. 13098-13107.

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Abstract

Colloidal processes such as nucleation, growth, ripening, and dissolution are fundamental to the synthesis and application of engineered nanoparticles, as well as numerous natural systems. In nanocolloids consisting of a dispersion of nanoparticles in solution, colloidal stability is influenced by factors including the particle surface facet and capping layer, and local temperature, chemistry, and acidity. In this paper, we investigate colloidal stability through the real-time manipulation of nanoparticles using in situ liquid cell Scanning Transmission Electron Microscopy (STEM). In a distribution of uniform iron oxide nanoparticles, we use the electron beam to precisely control the local chemistry of the solution and observe the critical role that surface chemistry plays in nanoparticle stability. By functionalizing the nanoparticle surfaces with charged amino acids and peptides, stability can be tuned to promote dissolution, growth, or agglomeration, either permanently or reversibly. STEM imaging is used to quantify kinetics of individual nanoparticles subject to local variations in chemistry. These measurements of dissolution and growth rates of iron oxide nanoparticles provide insights into nanoparticle stability relevant to synthesis and functionalization for biomedical applications.

Item Type:	Article
Depositing User:	Symplectic Admin
Date Deposited:	29 Aug 2019 10:02
Last Modified:	19 Jan 2023 00:37
DOI:	10.1039/c9nr03709h
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3049556