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. 2017 Sep 26;7(17):4217–4228. doi: 10.7150/thno.21557

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pH-induced aggregation-decomposition progress of NaDyF₄:10%Nd-GA-Fe. A-C) TEM images of NaDyF₄:10%Nd-GA-Fe in aggregation-decomposition progress. D,E) Hydrodiameter vs time plots of NaDyF₄:10%Nd-GA-Fe under different pH condition. F) Hydrodiameter vs concentration and pH plots of NaDyF₄:10%Nd-GA-Fe. G) Hydordiameter variations of NaDyF₄:10%Nd-GA-Fe under the different pH condition for five cycles. These results suggested NaDyF₄:10%Nd-GA-Fe can response to different pH condition and hence aggregate in acidic condition.