Dr. Hannah Juan Han

I am interested in the stability of aqueous REE hydroxyl complexes at hydrothermal conditions. My research mainly focuses on the hydrothermal laboratory experiments and a combination of these hydrothermal experiments and thermodynamic modeling to develop an internally consistent thermodynamic database for aqueous REE species using the program GEMS. The hydrothermal experiments will conducted to determine the hydrolysis constants of the aqueous REE hydroxyl complexes under high temperature conditions. These results will provide accurate fundamental thermodynamic information for improving the thermodynamic database and thus develop a new predictive model for aqueous REE hydroxyl complexes in a natural system. I am also interested in understanding the behaviors of REE species at hydrothermal conditions using different kinds of analytical instruments including ICP-OES, ICP-MS, IC and so on.

Ph.D., Analytical Chemistry, University of North Dakota (UND), USA.08/2016-08/2021

M.S., Analytical Chemistry, Northwest University, China. 09/2012-06/2015

B.S., Chemical Engineering and Technology, Hainan University, China.09/2007-06/2011

Scanning Electron Microsope (SEM), Transmission Electron Microscope (TEM), Spectrofluorometer, UV-Vis Spectrometer, Energy-Dispersive X-ray Spectroscope (EDS), Zetasizer Analysis, EBT Surface area and Pore Size Analysis, Fourier Transform Infrared Spectroscope (FTIR), Inductively Coupled Plasma Mass Spectrometry (ICP-MS), X-ray diffractometer (XRD), Mercury Analyzer, PAR 283 Potentiostat (EG & G), Electrochemical Workstation, Gas Chromatography (GC) and so on.

• Geochemistry of rare earth elements
• Experiments and thermodynamic modeling of rare earth elements at hydrothermal conditions

1. Xiao Liu, Juan Han, Xu Wu, David T Pierce, Julia Xiaojun Zhao. Eu-Coordinated semiconducting polymer nanoparticles as a novel nanoprobe with two detection method signals for determination of copper(II) ions. Sens. Actuators B Chem. 2021
2. Yuqian Xing, Juan Han, Xu Wu, David T Pierce, Julia Xiaojun Zhao. Graphene/gold nanoparticle composites for ultrasensitive and versatile biomarker assay using single-particle inductively-coupled plasma/mass spectrometry. Analyst, 2020
3. Xiao Liu, Juan Han, Xiaodong Hou, Furkan Altincicek, Oncel Nuri, David Pierce, Xu Wu, Julia Xiaojun Zhao. One-pot synthesis of graphene quantum dots using humic acid and its application for copper (II) ion detection. J. Mater. Sci.,2020
4. Yuqian Xing, Juan Han, Xu Wu, David T Pierce, Julia Xiaojun Zhao. Aggregation-based determination of mercury (II) using DNA-modified single gold nanoparticle, T-Hg (II)-T interaction, and single-particle ICP-MS. Microchimica Acta, 2020, 187,56
5. Wang Sai, Liu Kouqi, Han Juan, Ling Kegang, Wang Hongsheng, Jia Bao. Investigation of Properties Alternation during Super-Critical CO2 Injection in Shale. Applied Science. 2019, 9(8).
6. Juan Han, Jing Chang, Rong Wei, et al. Mechanistic investigation on tuning the conductivity type of cuprous oxide (Cu₂O) thin films via deposition potential. International Journal of Hydrogen Energy, 2018, 43, 13764-13777.
7. Ying Yang, Juan Han, Xiaohui Ning, etal. Photoelectrochemical stability improvement of cuprous oxide (Cu₂O) thin films in aqueous solution. International Journal of Energy Research, 2016, 40, 112-123.
8. Ying Yang, Juan Han, Xiaohui Ning, et al. Controllable morphology and conductivity of electrodeposited Cu₂O thin film: Effect of surfactants. ACS Appl. Mater. Interfaces, 2014, 6(24), 22534– 22543.
9. Zuo-Xi Li, Gan Ye, Juan Han, Ying Yang, et al. 1D-3D Mixed- ligand frameworks with an unusual dmp topology tuned by bent angles of isomeric benzenedicarboxylates: magnetic properties, gas- dependent calcinations- thermolysis and energy storage performances. Dalton Transactions, 2015, 44(19), 9209-20.