CPICs were synthesized in our laboratory as follows: (i) For the preparation of solution A, 0.20 g of CaCl2·2H2O and 3.8 ml of TEA were added into 80 ml of ethanol and then ultrasonicated for 5 min. (ii) For the preparation of solution B, 70 μl of H3PO4 was added into 20 ml of ethanol and stirred thoroughly. Solution B was dropped into solution A with slight agitation, and then CPICs (2 mg/ml) formed in the solution. The gel-like CPICs were collected through centrifugation [30,427 relative centrifugal force (Rcf)] and washed twice with ethanol.

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