Figure 1.

Surface modification of hydroxyapatite. (A) Schematic of the silanization of HAp nanopowder using 3-methacryloxypropyltrimethoxysilane. (B) ATR-FTIR spectra of HAp and Si-HAp. Characteristic peaks, 1: Si-CH₃ (870 cm⁻¹), 2: C=O (1638 cm⁻¹), 3: C=C (1706 cm⁻¹). (C) X-ray photoelectron spectra of HAp (left) and Si-HAp (right). * Si 2p (Si-O) peak, ~104 eV. (D) Scanning electron microscopy images of HAp (left) and Si-HAp (right) particles. magnitude, 50,000×. Scale bar, 100 nm.