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. 2017 Nov 3;7:14481. doi: 10.1038/s41598-017-14976-8

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Characterization of nCP:Fe. (A) Schematic of nCP:Fe where a few Ca²⁺ atoms are replaced by Fe³⁺ (B) Photograph of undoped nCP (left) and nCP:Fe (right) solution at concentration of 10 mg/mL. (C) TEM image of nCP:Fe, Inset: ED pattern (D) DLS showing size distribution (E) Zeta potential data (F) VSM data of different batches of nCP:Fe doped with varying concentration of Fe³⁺. (G) T2 and T1 weighted MR contrast of 1.25 mg/mL of nCP:Fe doped with varying concentration of Fe³⁺, dispersed in agar phantom. 4.1% Fe doped nCP showed an optimized dual T1-T2 contrast that is marked in white dotted box.