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arXiv 1004.0322cond-mat.mtrl-sci
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钛白纳米管层的可调功能和毒性研究

Tunable Functionality and toxicity studies of Titanium Dioxide Nanotube Layers

E. Feschet-Chassot, V. Raspal, O. K. Awitor, F. Bonnemoy, J. L. Bonnet, J. Bohatier

摘要:

在这项工作中,我们已经开发出经济的过程,阐述了可扩展的钛白纳米管层,显示出可调的功能。在0.4wt%氢氟酸溶液中,通过电化学阳极氧化钛箔制备了钛白纳米管层。利用X射线衍射和扫描电子显微镜对纳米管层的结构和形貌进行了表征。根据阳极氧化时间的不同,研究了表面形貌和润湿性。当电流密度达到局部最小值时合成的样品显示出较高的接触角。超过该点,接触角随阳极氧化时间减小。以酸性橙7在水溶液中的光降解为探针,考察了钛白纳米管层在紫外光照射下的光催化活性。在较高的电流密度下制备的样品具有较好的光催化活性。最后,我们使用纤毛原生动物T。pyriformis细胞模型,用于体外毒性研究,以预测钛白纳米管层在生物系统中的毒性。我们没有观察到任何特性的影响,在存在的钛白纳米管层的两个生理参数相关的生物体,非特异性酯酶活性和人口增长率。

英文摘要:

In this work, we have developed economic process to elaborate scalable titanium dioxide nanotube layers which show a tunable functionality. The titanium dioxide nanotube layers was prepared by electrochemical anodization of Ti foil in 0.4 wt% hydrofluoric acid solution. The nanotube layers structure and morphology were characterized using x-ray diffraction and scanning electron microscopy. The surface topography and wettability was studied according to the anodization time. The sample synthesized while the current density reached a local minimum displayed higher contact angle. Beyond this point, the contact angles decrease with the anodization time. Photo-degradation of acid orange 7 in aqueous solution was used as a probe to assess the photo-catalytic activity of titanium dioxide nanotube layers under UV irradiation. We obtained better photocatalitic activity for the sample elaborate at higher current density. Finally we use the Ciliated Protozoan T. pyriformis, an alternative cell model used for in vitro toxicity studies, to predict the toxicity of titanium dioxide nanotube layers in biological system. We did not observe any characteristic effect in the presence of the titanium dioxide nanotube layers on two physiological parameters related to this organism, non-specific esterases activity and population growth rate.

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