The as-prepared HAP rods (1 mg) were dispersed in ethanol solution (2 ml). This solution (10 μl) was dropped onto a marked TEM grid, and then the HAP rods were loaded on a TEM grid and the position of the HAP rods was recorded. The HAP-loaded grid was partially dipped into a CPIC ethanol solution (2 mg/ml) for 30 s and then withdrawn. After being air-dried at room temperature, these samples were successively examined by using HRTEM and EDXS. The ACP-coated HAP was kept in a sealed Petri dish to which droplets of deionized water were added to ensure a humid environment for the phase transformation from ACP to HAP. The total duration of the crystallization procedure was 30 min at 37°C. As the control group, half of the grid containing HAP rods was dipped into the conventional ACP ethanol solution (2 mg/ml), withdrawn, and air-dried at room temperature. These samples were characterized periodically by using HRTEM.

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