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. 2017 Aug 7;7(8):216. doi: 10.3390/nano7080216

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Measured M(H) curve at 300 K; (b) r₂ relaxation rate (1/T₂) vs. Ho³⁺ concentration (mM). Inset is r₂ map images of PEG–Ho₂O₃ NPs aqueous solution at different concentrations.