Adsorptive pressure-sensitive coatings on porous anodized aluminium
Adsorptive pressure-sensitive coatings on porous anodized aluminium
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DOI：
10.1088/0957-0233/15/3/001
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发表时间：
2004-03-01
影响因子：
2.4
通讯作者：
Amao, Y
中科院分区：
文献类型：
--
作者：
Kameda, M;Tezuka, N;Amao, Y
研制了一种新型的多孔阳极氧化铝压敏发光涂层。详细描述了制备涂层的方法。涂层是一层薄的阳极氧化铝层，通过电化学过程形成在铝表面上。发光体通过化学或物理吸附直接吸附到层的表面上。该涂层具有快速响应的特性，适用于非定常压力场的测量。对该涂层的时间响应进行了理论和实验研究。本文研究了四种发光体：三（4，7-二苯基菲咯啉）钌（Ⅱ）（[Ru（dpp）（3）]（2+））、四（4-羧基苯基）卟啉（TCPP）、铂四（4-羧基苯基）卟啉（PtTCPP）和芘丁酸（PBA）对压力阶跃的响应。利用压力跃变装置和激波管产生压力间断。还测试了一些静态特性。理论分析表明，由于多孔结构的存在，本发明的涂层应该具有微秒级的时间响应。时间响应不仅取决于发光寿命，这对时间响应施加了最终限制，而且取决于阳极氧化铝层的厚度，因为氧气渗透到阳极氧化铝层上存在的孔中可以被描述为扩散现象。有效扩散系数估计约为5 × 10（-6）m（2）s（-1）。实验结果表明，除了PtTCPP涂层的所有测试的涂层具有小于1毫秒的响应时间。只有PBA涂层表现出大量的光降解。[Ru（dpp）（3）]（2+）涂层的响应时间大于20 μ s，并且取决于阳极氧化铝层的厚度。另一方面，TCPP涂层的响应时间小于10 μ s，并且与层的厚度无关。这种独立性表明，阳极氧化铝层的表面上的发光体的布置影响时间响应。
A novel pressure-sensitive luminescent coating on porous anodized aluminium is developed. A method of making the coating is described in detail. The coating is a thin anodized aluminium layer, which is formed onto the surface of aluminium by an electro-chemical process. The luminophore is adsorbed directly onto the surface of the layer via chemical or physical adsorption. This coating is suitable for measuring unsteady pressure fields due to its fast-responding characteristics. The time response of the present coating is evaluated theoretically and experimentally. Four kinds of luminophore, tris(4,7-diphenylphenanthroline)ruthenium(II) ([Ru(dpp)(3)](2+)), tetrakis(4-carboxyphenyl)porphyrin (TCPP), platinum tetrakis(4-carboxyphenyl)porphyrin (PtTCPP), and pyrene butylic acid (PBA), have been tested on their response to a step change in pressure. A pressure jump apparatus and a shock tube were utilized to generate a pressure discontinuity. Some static characteristics were also tested. The theoretical analysis shows that the present coating should have a time response in the order of microseconds due to its porous structure. The time response depends not only on luminescence lifetime, which imposes an ultimate limit on the time response, but also on the thickness of the anodized aluminium layer, because oxygen permeation to the pores existing on the anodized aluminium layer can be described as a diffusive phenomenon. The effective diffusion coefficient is estimated to be approximately 5 x 10(-6) m(2) s(-1). Experimental results show that all the tested coatings except the PtTCPP coating have a response time of less than 1 ms. Only the PBA coating shows a substantial photodegradation. The response time of the [Ru(dpp)(3)](2+) coating is longer than 20 mus, and depends on the thickness of the anodized aluminium layer. The response time of the TCPP coating, on the other hand, is less than 10 mus, and is independent of the thickness of the layer. This independence suggests that the arrangement of the luminophore on the surface of the anodized aluminium layer affects the time response.