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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Effect of surface charge of TiO2 particles on hydroxyapatite formation in simulated body fluid
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Effect of surface charge of TiO2 particles on hydroxyapatite formation in simulated body fluid

机译：TiO2颗粒表面电荷对模拟体液中羟基磷灰石形成的影响

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摘要

TiO2 particles formed by heat treatment in a nitrogen atmosphere with an extremely low oxygen partial pressure exhibited high hydroxyapatite (HAp)-forming ability in simulated body fluid (SBF). X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning transmission electron microscopy (STEM) combined with electron energy loss spectroscopy (EELS) indicated that the particles were rutile-type TiO2, which contains hardly any nitrogen. Electron spin resonance (ESR) spectra revealed the reduction of Ti4+ in TiO2 to Ti3+ and the simultaneous introduction of oxygen vacancies to maintain charge neutrality. The enhanced HAp-forming ability of the TiO2 particles was likely related to their negatively charged surface, induced by water adsorption on oxygen vacancies, which resulted in acidic point formation. In contrast, TiO2 particles formed by heat treatment in air showed low HAp-forming ability because their surfaces had almost zero charge. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
机译：通过在具有极低氧分压的氮气氛中通过热处理形成的TiO2颗粒，在模拟体液（SBF）中表现出高羟基磷灰石（HAP）形状能力。 X射线衍射（XRD），X射线光电子能谱（XPS）和扫描透射电子显微镜（茎）与电子能损光谱（EEL）结合，表明颗粒是金红石型TiO 2，其含有几乎氮。电子自旋共振（ESR）光谱显示TiO2至Ti3 +中的Ti4 +的减少以及同时引入氧空位以维持电荷中立。 TiO 2颗粒的增强的Hap成形能力可能与其带负电的表面有关，通过水吸附在氧空位上诱导，导致酸性点形成。相反，通过在空气中的热处理形成的TiO 2颗粒表现出低的Hap成形能力，因为它们的表面几乎充电。 （c）2016年日本粉技术学会。由elsevier b.v发表。和日本粉末科技会。版权所有。

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