Accepted Manuscript Title: Improved magnetic relaxivity via hierarchical surface structure of dysprosium-engineered superparamagnetic iron oxide nanoparticles in ultra-high magnetic field Authors: Jeong Chan Park, Jun Kue Park, Gyeong Tae Lee, Do Hyeon Kim, Hyunsil Cha, Tae Yoon Park, Maengjun Kim, Yongmin Chang, Hyung Joon Cha, Jeong Hyun Seo PII: S1226-086X(19)30225-4 DOI: https://doi.org/10.1016/j.jiec.2019.05.004 Reference: JIEC 4544 To appear in: Received date: 29 January 2019 Revised date: 18 April 2019 Accepted date: 4 May 2019 Please cite this article as: Park JC, Park JK, Lee GT, Kim DH, Cha H, Park TY, Kim M, Chang Y, Cha HJ, Seo JH, Improved magnetic relaxivity via hierarchical surface structure of dysprosium-engineered superparamagnetic iron oxide nanoparticles in ultra-high magnetic field, Journal of Industrial and Engineering Chemistry (2019), https://doi.org/10.1016/j.jiec.2019.05.004 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.