In this investigation, the natural 2D photonic crystals (PhCs) within peacock feathers are applied to incorporate CdS nanocrystallites. Peacock feathers are activated by ethylenediaminetetraacetic/dimethylformamide suspension to increase the reactive sites on the keratin component, on which CdS nanoparticles (nano-CdS) are in situ formed in succession and serve as the "seeds" to direct further incorporation during the following solvothermal procedure. Thus, homogeneous nano-CdS are loaded both on the feathers' surface layer and inside the 2D PhCs. The obtained nano-CdS/peacock feathers hybrids are novel photonic crystals whose photonic stop bands are markedly different from that of the natural PhCs within original peacock feathers, as observed by the reflection spectra.
The micromachining of complex three-dimensional microstructures (bulk micromachining) on metals can be applied to fabricate many novel devices for micro electromechanical system (MEMS), which will greatly benefit the development of MEMS. In this paper, a new electrochemical micromachining method named the confined etchant layer technique (CELT) was explored on the micromachining of the titanium alloy. Micro-scale trapezoidal slots were replicated on titanium alloy by using a mold with the corresponding negative microstructures (trapezoidal teeth). The machining resolution reached 0.503 mu m. The electrochemical mechanisms involved in the process are analyzed and the parameters that influenced the machining resolution are discussed
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