Influence of calcination conditions on dispersibility and phase composition of hydroxyapatite crystals calcined with anti-sintering agents
Influence of calcination conditions on dispersibility and phase composition of hydroxyapatite crystals calcined with anti-sintering agents
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煅烧条件对抗烧结剂煅烧羟基磷灰石晶体分散性和物相组成的影响
DOI：
10.1007/s11051-014-2469-0
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发表时间：
2014
影响因子：
2.5
通讯作者：
Tsutomu Furuzono
中科院分区：
文献类型：
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作者：
Masahiro Okada;Yuko Omori;Mayuko Awata;Tsubasa Shirai;Naoyuki Matsumoto;Shoji Takeda;Tsutomu Furuzono
我们研究了煅烧条件的影响，通过煅烧与抗烧结剂，聚（丙烯酸，钙盐）（PAA-Ca），周围的纳米晶体，制备可分散的羟基磷灰石（HAp）纳米晶体。首先，采用湿化学法合成了球形（直径58 nm）和棒状（长度约350 nm）两种低结晶度HAp纳米粒子，并在水溶液中用PAA-Ca包覆。将HAp/PAA-Ca混合物干燥并在800或1，000 ℃下煅烧1小时。最后用水性介质洗涤所得混合物以除去围绕纳米晶体的CaO-PAA-Ca-的热分解产物。增加PAA-Ca的量可以有效地防止纳米晶之间的煅烧诱导烧结，但增加PAA-Ca的量也会导致CaCO 3的形成，这是由于PAA-Ca在800 °C下热分解1 h不完全。通过在较高温度（1，000 °C）下煅烧可以获得高度分散且相纯的HAp纳米晶体。我们还发现，钙离子从防烧结剂迁移到HAp纳米晶体中，并且钙离子迁移的程度因低结晶度HAp纳米颗粒的性质和煅烧温度而异。
We investigated the influence of calcination conditions to fabricate dispersible hydroxyapatite (HAp) nanocrystals via calcination with an anti-sintering agent, poly(acrylic acid, calcium salt) (PAA-Ca), surrounding the nanocrystals. First, two kinds of low crystallinity HAp nanoparticles with spherical morphology (58 nm in diameter) and rod-shaped morphology (around 350 nm in length) were synthesized by wet chemical processes, and then coated with PAA-Ca in aqueous media. The HAp/PAA-Ca mixture was dried and calcined at 800 or 1,000 °C for 1 h. The resultant mixture was finally washed with aqueous media to remove CaO—the thermally decomposed product of PAA-Ca—surrounding the nanocrystals. The calcination-induced sintering between the nanocrystals was efficiently prevented by increasing the amount of PAA-Ca, but the increased amount of PAA-Ca also led to the formation of CaCO3due to the incomplete thermal decomposition of PAA-Ca at 800 °C for 1 h. Highly dispersible and phase pure HAp nanocrystals could be obtained by calcination at higher temperature (1,000 °C). We also found that calcium ions were migrated from the anti-sintering agent into the HAp nanocrystals, and the degree of calcium ion migration varied by the nature of the low crystallinity HAp nanoparticles and the calcination temperature.