Adachi Eiki
L'Oréal Recherche, KSP R&D D-637, Kawasaki, Kanagawa 213-0012, Japan.
J Morphol. 2007 Sep;268(9):826-9. doi: 10.1002/jmor.10557.
The Japanese jewel beetle (Chrysochroa fulgidissima) is one of the beautiful beetles showing metallic green color that is kept over a millennium. This is a typical structural color resulting from a multilayer, frequently seen in insects. It was found that the elytra unexpectedly change the color from original green to blue or red by heating at 200 degrees C or by immersing in bromoform for over 1 month. This variability implies that the multilayer consists of a thermosensitive porous material. The color change induced by heating was accompanied with elytron shrinkage; the sensitivity of the reflection peak was -0.6 nm/ degrees C in 30-65 degrees C. The porous structure was determined by positron annihilation lifetime spectroscopy; the averaged pore radius was around 0.25-0.30 nm, which is close to the size of the bromoform molecule. These features prove the thermosensitivity and porous structure of the multilayer although in unusual environments.
日本吉丁虫（Chrysochroa fulgidissima）是一种拥有金属绿色、历经千年仍保持美丽的甲虫。这是一种典型的由多层结构产生的结构色，在昆虫中很常见。研究发现，通过在200摄氏度加热或在溴仿中浸泡超过1个月，鞘翅会意外地从原来的绿色变为蓝色或红色。这种可变性意味着多层结构由热敏性多孔材料组成。加热引起的颜色变化伴随着鞘翅收缩；在30 - 65摄氏度范围内，反射峰的灵敏度为-0.6纳米/摄氏度。多孔结构通过正电子湮没寿命谱确定；平均孔径约为0.25 - 0.30纳米，这与溴仿分子的大小相近。这些特征证明了多层结构在异常环境下的热敏性和多孔结构。
