Bubbles are sweet

A Sino-Japanese team make cheap buckyfoam by bowing bubbles out of sugar and fertiliser.

Via Tina Casey at CleanTechnica, a beautiful discovery. The inspiration:



Explanation
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A lot of effort is going into nanomaterials made out of hexagons of linked carbon atoms: buckyballs (spheres), graphene (flat sheets), nanotubes (sheets rolled into cylinders). The combination of great mechanical strength, very high conductivity, and dirt cheap raw material is enticing. The trouble with these nanomaterials is that they are, well, nano: tiny objects that are difficult to assemble into anything macroscopic. It’s hard for instance to connect a sheet of graphene one atom thick to a wire, even the tiny sort in integrated circuits. I reported some time ago on buckystring, superfine thread spun out of nanotube fibres, but SFIK it’s stayed in the lab. Carbon-fibre composites are widely used in aircraft, but the reinforcing fibres are not composed of nanotubes. Hence the search for more manageable 3D forms.

Enter the Japanese materials scientist Yoshio Bando and his Chinese colleague Xuebin Wang.

From their press release:

Inspired by the ancient food art of ‘blown sugar’, Bando and his team reasoned that the strutted, coherent nature of conjoined bubbles would lend itself to strength and conductivity if graphene could be structured in the same way. The researchers created a syrup of ordinary sugar and ammonium chloride. They heated the syrup, generating a glucose-based polymer called melanoidin, which was then blown into bubbles using gases released by the ammonium. [….]
As the bubbles grew, the remaining syrup drained out of the bubble walls, leaving within intersections of three bubbles. Under further heating, deoxidization and dehydrogenation, the melanoidin gradually graphitized to form ‘strutted graphene’: a coherent 3D structure made up of graphene membranes linked by graphene strut frameworks, which resulted from original bubble walls and intersectional skeletons respectively. [ ….] The resulting 3D graphene is robust [it can be compressed to 80% and bounce back] and maintains excellent conductivity.

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They are talking about capacitors, but I dare say people will find other uses as well.

Bando is already making his buckyfoam in gramme quantities. He even quotes a cost: $0.5 a gramme. Since sugar costs $1.50 a kilo retail and lab-grade ammonium chloride $22 (fertiliser grade is a fraction of that), the main cost is the heating.

I obviously can’t guarantee that this is the breakthrough to usable buckymaterials. It must now be the front runner. Plainly there are hurdles ahead. Can you make large homogenous blocks of buckyfoam? Can you make thin sheets? If so, can you cut them with lasers into wires? I post news of this mainly to celebrate the strange ways of the creative imagination.

soap bubble foamThe street sugar-blowers of Asia blow very thick-walled bubbles, but not foams. This video shows that it is possible to blow short-lived sugar bubble clusters, but not comparable to the polygonal structures you can achieve with soap. Bando and Wang are not on oath about their inspiration, and I suspect soap and small children come in to it too.

Author: James Wimberley

James Wimberley (b. 1946, an Englishman raised in the Channel Islands. three adult children) is a former career international bureaucrat with the Council of Europe in Strasbourg. His main achievements there were the Lisbon Convention on recognition of qualifications and the Kosovo law on school education. He retired in 2006 to a little white house in Andalucia, His first wife Patricia Morris died in 2009 after a long illness. He remarried in 2011. to the former Brazilian TV actress Lu Mendonça. The cat overlords are now three. I suppose I've been invited to join real scholars on the list because my skills, acquired in a decade of technical assistance work in eastern Europe, include being able to ask faux-naïf questions like the exotic Persians and Chinese of eighteenth-century philosophical fiction. So I'm quite comfortable in the role of country-cousin blogger with a European perspective. The other specialised skill I learnt was making toasts with a moral in the course of drunken Caucasian banquets. I'm open to expenses-paid offers to retell Noah the great Armenian and Columbus, the orange, and university reform in Georgia. James Wimberley's occasional publications on the web

One thought on “Bubbles are sweet”

  1. What is certain is that people are being successfully creative in exploring different ways of creating nanostructures.

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