Synthesis of hydroxyapatite nanowires (HAp NWs) from eggshell by solvothermal method using oleic acid as soft-template

Hydroxyapatite (HAp) is a bioceramic material that exhibits excellent compatibility with the human body. This characteristic has attracted attention, particularly in medicine and technology. Researchers have recently focused on studying the synthesis of HAp derived from natural sources. This study used eggshell-derived CaO precursors and CaCl2 to synthesize HAp nanowires (NWs) with different Ca/P ratios, namely 1:2 and 2:3. The nanowire formation process is facilitated by including oleic acid as a soft template. Significantly, all variations of HAp NWs exhibit a crystallite size below 20 nm and a crystallinity exceeding 78