Superhydrophilic porous TiO2 film prepared by phase separation through two stabilizers
Superhydrophilic porous TiO2 film prepared by phase separation through two stabilizers
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DOI：
10.1016/j.apsusc.2010.11.125
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发表时间：
2011-03
影响因子：
6.7
通讯作者：
Weixin Huang;W. Deng;Ming Lei;Hong Huang
中科院分区：
文献类型：
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作者：
Weixin Huang;W. Deng;Ming Lei;Hong Huang
提出了一种制备表面具有圆孔的TiO{sub 2}薄膜的新方法。以乙酰丙酮（AcAc）和二乙醇胺（DEA）为稳定剂制备的前驱体溶液中，孔的形成主要是由于前驱体溶液中存在大量的孔.讨论了在溶胶-凝胶过程中相分离的相关性，与存在的Al 2 O3和DEA的膜的互连或孤立的孔的外观。大孔尺寸以及孔和凝胶骨架的连通性可以通过选择用于在DEA量下制备的适当组合物或调节溶胶-凝胶转变的时间尺度来控制。最后，润湿行为的所得膜的特征在于通过使用接触角测量。具有相互连通或相对孤立的孔道结构的TiO{sub 2}薄膜，虽然不受紫外光照射，但仍具有超亲水性。由Wenzel-Cassie浸润区的过渡判据，可以得到Cassie浸润区的存在而不是Wenzel浸润区的存在。
A novel method was developed to produce a TiO{sub 2} film with circular pores on its surface. The pores aroused from the precursor solution using both acetylacetone (AcAc) and diethanolamine (DEA) as stabilizers. The appearance of interconnected or isolated pores for the films was discussed in relation to the phase separation in the sol-gel process with the presence of Acac and DEA. Macropore size, together with connectivity of pores and gel skeleton, can be controlled by selecting an appropriate composition for preparation at DEA amount or regulating a time scale of the sol-gel transition. Finally, wetting behavior of the resulting films was characterized by using contact angle measurements. The TiO{sub 2} films with interconnected or relatively isolated pores exhibit superhydrophilic characteristic, although it is not exposed to ultraviolet irradiation. Deducing from the Wenzel-Cassie regimes' transition criterion, the existence of Cassie impregnating wetting regime rather than Wenzel one upon these porosity-driven superhydrophilic surfaces can be obtained.