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Saturday, 19 October 2019
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Chemistry: Giant hyperthermal effect in Mg-doped Fe3O4 - Friday, 09 February 2018 11:36
Biology: Nanodiamonds for antibacterial implants - Monday, 02 November 2015 21:41
Ecology: Nano-products risks overexaggerated - Tuesday, 24 June 2014 11:02
Polymer nanobarriers Nanoparticles go through BBB Quantum Dots

Polymer nanobarriers

Irish Scientists Developing New Material To Increase Shelf Life Of Beer. More in this article.

Nanoparticles go through BBB

Blood-brain barrier was shown to be permeable for particles as big as >200 nm, a group of scientists from Johns Hopkins University show. More in this article.

Quantum Dots

Quantum Dots Can Shine Even Brighter

Graphene quantum dots by a bottom-up synthesis.

graphene quantum dots bottom-up synthesisFew years ago was it shown that colloidal graphene doped with nitrogen can behave as a quantum dot – i.e. absorb light at one wavelength and emit it at another, longer wavelength. Such graphene particles were synthesized exclusively be top-down approach from massive graphite using oxidation, exfoliation and reduction procedures. The major drawback of such approach is that an undefined mixture of all possible molecules and structures is produced at the end, each of them having its own properties.

Now, for the first time graphene particles could be synthesized by a bottom-up approach. Scientists from Indiana University in cooperation with Case Western University (USA) have started three 7-step syntheses from benzene derivative ending up with three different graphene molecules, two of which were on purpose doped with nitrogen. To the amusement of the authors, only undoped graphene exhibited fluorescence. The other two had a potent electrocatalytic activity.

 

This work opens new avenues for the tailored controlled synthesis of colloidal graphenes boosting the research activities ending up in a better fundamental understanding of graphenes and in new applications from catalysis through lightning to microelectronics.

Image published with the permission of American Chemical Society
 
2012-11-07 NanoJam (c) 2012
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Science is built upon facts, as a house is built of stones; but an accumulation of facts is no more a science that a heap of stones is a house.

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