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Thursday, 09 April 2020
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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

ZnO nanoparticlesPUNE: In a breakthrough discovery, scientists at the Agharkar Research Institute (ARI) here have shown that zinc oxide nanoparticles could be used for treating both non-insulin dependent (Type I) and insulin dependent (Type II) diabetes. What's more important is that the drug is patient-friendly as just one pill a day will keep blood sugar levels under control. The scientists have successfully carried out laboratory tests on rats and the study has been published in the renowned medical journal Nanomedicine on February 21.

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.

All-Carbon Solar Cells.

 

nn-2012-02893p 0006Scientists in MIT have reported the successful development of all-carbon-based solar cells. Article of Bernardi et al. in ACS Nano reports on solar cells with active layers made solely of carbon nanomaterials that present the same advantages of conjugated polymer-based solar cells, namely, solution processable, potentially flexible, and chemically tunable, but with increased photostability and the possibility to revert photodegradation. The device active layer composition is optimized using ab initio density functional theory calculations to predict type-II band alignment and Schottky barrier formation.

Nanotech publications by countries, 2012

According to the statistics regarding the number of scientific publications during the first half of 2012, China’s world share, with a total number of 12,945 articles, corresponds to 28%. The European Union and the US hold the second and the third places on the list, with 26% and 19% respectively.

According to  “Nano Statistics” report, the publications associated with nanotechnology constitutes 8.3% of the whole scientific literature generated during the period. About 55% of the scientific articles published on the topic are due to the Asian nations.

Top 27 countries publishing the most nano-related ISI journal papers during the first half of 2012 are listed as below:

Country Nr. of nanotech publications World share, %
China incl. Hong Kong 12945 28,07
USA 8948 19,40
Germany 3133 6,79
South Korea 3055 6,62
Japan 3005 6,52
India 2739 5,94
France 2160 4,68
UK 1680 3,64
Iran 1601 3,47
Spain 1584 3,43
Taiwan 1429 3,10
Italy 1428 3,10
Canada 1208 2,62
Russia 1194 2,59
Australia 1063 2,30
Singapore 924 2,00
Switzerland 685 1,49
Brazil 654 1,42
Netherlands 623 1,35
Poland 618 1,34
Sweden 537 1,16
Belgium 491 1,06
Turkey 477 1,03

In comparison with the same statistics of the year 2011, it can be noted that the first eight countries have maintained their positions unchanged. Additionally, Spain and Taiwan are down one place each, this year. Iran has jumped up two places to the 9th in the recent ranking. The Local Share in Nanoscience indicator, which quantifies the nanotech-related share of scientific journal papers within a country, reveals Singapore as the first with an approximate 20% value. Subsequently, Iran (16.2%), China (16.0%) and South Korea (14.5%) occupy the ranks 2 to 4, respectively. The first eight countries included in the list are located in Asia and this reveals that Asian countries have devoted a great deal of attention to nano science and technology.

Source: adopted from en.nano.ir

 

2012 jppc schenderova lum gis

 

A group of scientists from International Technology Centre in Releigh, US reported a successful synthesis of luminescent carbon nanostructures from graphite intercolation compoungs using graphite, HOPG and onion-like carbon as starting materials. To achieve this goal, scientists oxidized different carbon materials in a H2SO4:HNO3 mixture for different times and at different temperatures. Further separation of the obtained material into fractions of different sizes yielded a series of relatively monodisperse nanoparticles exhibiting luminescence from blue to orange depending on the particles’ sizes. This work opens new possibilities in the field of luminescent non-toxic nanomaterials. More details on this work can be found in the publication in The Journal of Physical Chemisty C at dx.doi.org/10.1021/jp303061e.

Image is provided under permission of ACS.

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