A study on fabrication and application of the porous material on soft and rigid substrates

Abstract

The special porous structure of Anodic Aluminum Oxide (AAO) will interfere with the light reflected on the surface and bottom of the medium Bragg diffraction can be used to explain the imaging principle of structural color but the traditional anodizing process usually uses expensive high-purity aluminum and two-stage anodization (2-20 hr) at low temperature (0~10℃) for a long time Not only the cost is very expensive but also not easy to produce in large quantities the practicality is also limited Therefore this study explored the short-term anodization of soft and hard aluminum metal substrates in 0 3M oxalic acid at room temperature and the preparation of nanoporous anodic aluminum oxide templates using different anodization potentials and different anode times Observation The AAO structure morphology and the resulting structural color trends are discussed and future applications and developments are discussed to achieve low-cost high-efficiency and high-saturation AAO structural colors Through the Hybrid Pulse Anodization (HPA) process technology the industrially prepared AAO substrate is changed from the traditional use of high-purity aluminum to aluminum alloy AA1050 or to further increase the practicality of the color of the anodized aluminum structure we can achieve the same or even better color effect by using a lower purity soft substrate And use the Bragg diffraction formula to verify the color forming principle of AAO and apply it to reverse the main color which is conducive to the color selection of AAO patterning in the future The color matching is carried out through the parameters reversed by the Bragg diffraction formula and the AAO pattern with a better resolution than the traditional one and the anti-counterfeiting invisible pattern are successfully prepared replacing the traditional complex anti-counterfeiting technology and it has the effect of instant identification Finally the AAO structure color prepared by the soft and hard substrate is combined with the wearable device and a wearable bracelet application with liquid sensing or Internet of Things technology is provided

Date of Award	2020
Original language	English
Supervisor	Chen-Kuei Chung (Supervisor)