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Study of Bio-chromism Mechanism and Biomimetic Thin Films

Author: TianTian
Tutor: LuoZhiGang
School: National University of Defense Science and Technology
Course: Biomedical Engineering
Keywords: Bionic Discolor Camouflage Mesoporous Self-assembly Phosphomolybdic acid Amino-functionalized
CLC: Q811
Type: Master's thesis
Year: 2006
Downloads: 264
Quote: 1
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Abstract


In this paper, the adaptive change color to camouflage military camouflage field urgent need to study the mechanism of the nature the discoloration of biological chameleon change color and additive color mixing and subtractive color mixing principle-based, random arrangement of color point analog transparent coloring the slide overlap method simulation computer simulation of cell expansion chameleon skin surface structure and the discoloration process simulation study simulated battlefield forest grass green the Desert color and the color of mud, verify the blending the mechanism of the chameleon of the pigment cells of the skin surface and the feasibility of its application in military camouflage, provides a theoretical basis for the work of the follow-up bionic. Prepared in order to achieve a chameleon bionic ordered mesoporous films mimic the cell structure, and mimic the biological pigment photochromic molecules introduced ordered mesoporous prepare the photochromic film, containing a dye used to mimic the biological cells. Through the regulation of mesoporous pore size and the photochromic molecules discoloration performance, to achieve biological discoloration bionic. At the same time, the use of different photochromic molecules mixed Join blending discoloration mechanism of biological bionic preliminary exploration. Ordered mesoporous materials for analog cell framework prepared by evaporation induced self-assembly (EISA) method. Three surface-active agent (CTAB, Brij-56, P123) as a structure-directing agent, tetraethyl orthosilicate (TEOS) and 3 - aminopropyl triethoxysilane (APTES) as silica source under acidic conditions prepared with different pore sizes, different phase structure (two-dimensional hexagonal or three-dimensional cubic structure) amino-functionalized organic - inorganic hybrid mesoporous silica thin film, and preparation process their orderly structure of the influencing factors. The channels then implanted in the way, the Keggin structure of the simulation cytochrome phosphomolybdate molecular assembly into mesoporous films prepared issued photochromic properties of mesoporous composite film. The results show that the phosphomolybdate particles well dispersed and firmly attached to the amino function of the silicon oxide film of mesoporous pores, film discoloration effect, with the immersion time, the amino group content and the illumination time have a certain relationship, the price of the layer charge transfer is to produce photochromic essentially reason. On this basis, the paper discussed in-depth phosphomolybdate molecular assembly of ordered mesoporous silica film photochromic properties. Bionic technology combined with camouflage stealth, provides a new approach to the development of military camouflage, light-induced discoloration mesoporous film as a new type of camouflage material, it can be adapted to the mobility of the current war, the broad requirements of the combat zone solve adaptive camouflage the key technical issues. At the same time provide a theoretical and practical basis for the mesoporous film and the design and synthesis of photochromic materials. In addition, the material in photochromic optical switch, also have a wide range of applications in areas such as information storage.

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CLC: > Biological Sciences > Bioengineering ( Biotechnology ) > Bionics
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