World first as scientists grow microtubes from crystals (Video)

Mar 02, 2009
The microtubes were shown to be water-tight by injecting a fluorescent dye into them. Scientists can also control the direction of growth to create any pattern they choose.

(PhysOrg.com) -- In a world-first, scientists at the University of Glasgow have grown micro-tube structures from crystals of inorganic compounds.

The discovery - published in Nature Chemistry’s April edition - has major implications for the micro-fluidics industry with applications in medical sensing - through so called lab-on-a-chip devices - being one of the major prospects.

This video is not supported by your browser at this time.

The tiny tubes were observed sprouting from crystals of Keggin-net, a type of polyoxometalate which comprises large clusters of metal and oxygen atoms, seconds after they were immersed in water containing positively-charged organic molecules - or cations.

Scientists were able to control the rate of tube growth, by varying the concentration of the cation solution, and the direction of growth by altering the polarity of electrodes placed around the crystals. By injecting a fluorescent dye into the tubes they demonstrated the tubes were also water tight.

Professor Leroy Cronin, who leads the research group that made the discovery, in the Department of Chemistry, University of Glasgow, said: “The phenomenon we have discovered is quite amazing. It presents the possibility of growing micro-fluidic channels in any pattern you want, controlling the rate of growth and direction like an Etch-a-Sketch, and then flowing liquids through the tubes. It might also provide some intriguing insights into the emergence of life.”

When severed, the tubes, which can grow at rates of between one micron to more than 100 microns per second, continued to grow from the point where they were cut. They can also negotiate obstacles and merge with each other. Tube diameters were as small as 20 microns (for comparison, a human hair is 100 microns wide). Tubes many millimetres long were observed before growth ceased when the crystal was nothing but an empty shell.

The research team will publish a recipe for growing the microtubes so that others can experiment with different materials. Different polyoxometalates will vary the chemical properties of the tubes enabling them to react with different cation solutions presenting various possibilities for applications in medical sensing, for example.

Prof Cronin said: “It’s an intriguing process and one which might have many exciting applications in making micro-fluidic devices. Because it appears that many types of polyoxometalates can be used to grow tubes, they could be designed to have a variety of functions and applications. We intend to research further the mechanism of tube growth and formation and demonstrate even higher levels of control.”

More information: A paper on the discovery - ‘Spontaneous assembly and real-time growth of micro-metre-scale tubular structures from polyoxometalate-based inorganic solids’ - will be published in April in Nature Chemistry and online at www.nature.com/chemistry .

Provided by University of Glasgow

Explore further: Method allows boron atoms to be added to opposing sides of an alkyne molecule

add to favorites email to friend print save as pdf

Related Stories

New system to optimize public lighting power consumption

35 minutes ago

In order to meet the efficiency requirements of the latest public lighting regulations, researchers from the School of Industrial Engineers of Universidad Politécnica de Madrid (UPM), in collaboration with ...

Lunar occultation of Saturn

43 minutes ago

On the night of Monday August 4, mainland Australia will see Saturn disappear behind the moon. It's the third time this year that the moon and Saturn will perfectly line up, as viewed from our part of the ...

Recommended for you

Scientists develop pioneering new spray-on solar cells

12 hours ago

(Phys.org) —A team of scientists at the University of Sheffield are the first to fabricate perovskite solar cells using a spray-painting process – a discovery that could help cut the cost of solar electricity.

Free pores for molecule transport

Jul 31, 2014

Metal-organic frameworks (MOFs) can take up gases similar to a sponge that soaks up liquids. Hence, these highly porous materials are suited for storing hydrogen or greenhouse gases. However, loading of many ...

User comments : 0