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Posted: Sep 20, 2010

Graphene Supermarket to Offer Q-Graphene for Biomedical and Energy Storage Applications

(Nanowerk News) Graphene Supermarket has announced a new addition to a family of nanoscale carbon materials, Q-Graphene™. This nanomaterial consists of hollow, porous, multi-wall carbon nanospheres or polyhedral structures with a narrow size distribution and an average particle size of approximately 80 nm and an average aspect ratio close to 7:5. Such structures are also referred to as carbon Q-dots or nanoonions, which are close relatives of fullerenes. Q-Graphene™ is expected to find wide use in multiple practical applications. Q-Graphene™ is perfect for light-weight composite materials required in space and aircraft design. Furthermore, Q-Graphene™ is an attractive material for the next generation of thin film batteries and supercapacitors.
One advantage of the carbon onion-based supercapacitors is their outstanding discharge rate, i.e., the time period during which the stored energy can be released. Carbon onion-based supercapacitors can be employed as nanoscale energy storage elements incorporated directly on a chip [1].
In addition, high-volume 3D spheres of Q-Graphene™ can serve as an inert support substrate for catalysis applications as reagents can be trapped both on the surface and inside of the carbon cage. Owing to its true nanoscale size, Q-Graphene™ is a valuable addition to biomedical nanomaterials. The use of traditional semiconductor nanoparticles in biology and medicine is hindered by concerns over their toxicity and potential environmental hazard. In contrast, carbon nanospheres, such as Q-Graphene™, are expected to have low toxicity and few significant side effects. Because of its low toxicity, there are numerous opportunities for the Q-Graphene TM to be used in biology and medicine. The quantum dots made of chemically modified carbon are less toxic than the conventional CdSe/ZnS quantum dots and they possess superior performance as fluorescence imaging agents [2].
Due to their low toxicity, the carbon nanoonions can also be used for the intercellular drug delivery vehicles of membrane-impermeable molecules [3]. Carbon nanospheres have been demonstrated to target tumors, and as a result can be used for the infrared sensing of cancer cells, in vivo imaging, and localized optothermal therapy. This week Graphene Supermarket, a leading supplier of nanocarbon and graphene products, will begin offering a new class of carbon nanomaterial products, Q-Graphene™.
[1] Ultrahigh-power micrometre-sized supercapacitors based on onion-like carbon, David Pech , Magali Brunet , Hugo Durou , Peihua Huang , Vadym Mochalin, Yury Gogotsi, Pierre-Louis Taberna & Patrice Simon.
[2] Carbon Dots for Optical Imaging in Vivo, Sheng-Tao Yang, Li Cao, Pengju G. Luo, Fushen Lu, Xin Wang, Haifang Wang, Mohammed J. Meziani, Yuanfang Liu, Gang Qi and Ya-Ping Sun.
[3] Intrinsically Fluorescent Carbon Nanospheres as a Nuclear Targeting Vector: Delivery of Membrane-Impermeable Molecule to Modulate Gene Expression In Vivo, B. Ruthrotha Selvi, Dinesh Jagadeesan, B. S. Suma, G. Nagashankar, M. Arif, K. Balasubramanyam, M. Eswaramoorthy and Tapas K. Kundu
Source: Graphene Supermarket (press release)
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