Bewise Inc. www.tool-tool.com Reference source from the internet.
感謝近來膠體化學（colloid chemistry）長足的進步，現在可以製作出隨
著周遭環境變化的顏色的物質。現在德國的研究人員更進一步，他們利用
離子轟炸（ion bombardment）以及所謂的黃金金屬粉末噴塗（gold
metallisation），打造出可以透過化學方式量身訂做鍵結條件的粒子。這
可以讓新車的塗裝隨著溫度或是溼度改變顏色
Max Planck researchers in Potsdam, Germany expand the tool kit of colloid particles and make new coloured finishes possible
Scheme
of the production of defined layered microparticle arrays. Left: a side
view of a colloidal crystal being bombarded with reactive ions.Middle: a
side view of a colloidal crystal whose size is being reduced by ion
bombardment. The crystal is metallised by gold. Right: a colloid crystal
with small colloids (pink) in its uppermost layer, a middle layer
(blue) and a third layer (black), which contains gold deposits (orange)
as triangular-shaped surfaces.Image: Max Planck Institute of Colloids
and Interface
Click here for a high resolution image.
Nail polish and expensive cars can nowadays shimmer in many colours, thanks to progress in the field of colloid chemistry, the chemistry of small particles. The bright colours in modern finishes are created because the light is reflected at layers of regularly arranged colloid particles. Individual colours are either removed or strengthened; the thickness of the layers -- what is known as the "lattice constant" -- determines the colour. Because we can nowadays tailor the spherical shape and the surface of the particles, we can produce optimised crystals with the desired lattice constant in the range of visible light.
Colloids can indeed do much more: they are also interesting model systems for solid-state physics, because the bonding behaviour of the relatively large particle can be compared with that of much smaller atoms. Since they react more slowly than atoms, we can use them to observe and study processes in solid-state physics. But there is a problem: most atoms, unlike most other particles, are not by rule spherically symmetric, but rather have deformed "orbitals" which project into space like dumbbells or ovals.
The team of researchers from the Max Planck Institute of Colloids and Interfaces, led by Dr Wang, has now produced particles that do not interact with their neighbours in spherically symmetric ways. So they placed a colloidal crystal on a surface (image 2) and bombarded it with reactive ions, reducing the particles in the upper layer to the desired size and expanding the free surfaces between the colloids.
They also metallised the crystal with gold. Part of the gold passed through the gaps in the upper layer as if through a stencil, all the way to the lower layers. In this way, patterns of metallisation of various symmetries and at nanoscale sizes are produced (see image 1). Gold surprisingly also lodged itself in the deep layers on the underside of the particles. (image 1, right)
For years, chemistry has had a number of methods to intentionally use gold in reactions, for example, in joining particular molecules. Thus the particles partially overlaid with gold expand the tool kit of "colloid atoms". The chemists hope that in the future they will be able to build "colloid molecules" or new kinds of colloid crystals. For the chemistry of colours, too, there are more possibilities: new, shimmering colours, that, for example, change with the surrounding temperature or humidity. In the long-term, however, the most attractive applications appear to be in optical data processing.
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