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10-05/06 :: May/June 2010

nanotimes News in Brief

tiple diodes for enough electron energy and good solar absorption (using multiple photons for one electron reaction like natural photosynthesis).

This is in stark contrast to conventional semiconduc- tor particle system with randomly loaded catalyst, in which the electron-hole separation and charge transport usually relies on diffusion, and typically with low efficiency and limited stability.

Xiangfeng Duan and his colleagues – Yongquan Qu, Lei Liao, Rui Cheng, Yue Wang, Yung-Chen Lin, Yu Huang – believe this concept will have important implications for future green chemistry and sustai- nability science, and can impact significantly in areas such as environmental remediation, artificial photosynthesis and solar fuel production. Yongquan Qu, Lei Liao, Rui Cheng, Yue Wang, Yung- Chen Lin, Yu Huang and Xiangfeng Duan: Rational De- sign and Synthesis of Freestanding Photoelectric Nanode- vices as Highly Efficient Photocatalysts, In: Nano Letters, Vol. 10(2010), Issue 5, May 12, 2010, Pages 1941-1949, DOI:10.1021/nl101010m: http://dx.doi.org/10.1021/nl101010m

End of April the international micro- and nanotech- nology community met in Dortmund, Germany on the occasion of the 16th international Micromachine Summit. This year, about 100 delegates from some 20 nations held a meeting about „AAL-Ambient Assisted Living“ and discussed improvements and political strategies of the countries with a view to funding and the utilization of new technologies. The aim of AAL-technologies is to open up age-based assistance systems for more quality of everyday life. In future, micro- and nanotechnologies will be able

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to help long-term care patients for example with telemedicine. http://www.mms10.org

Researchers at the Fraunhofer Institute for Ma- nufacturing Engineering and Applied Materials Research (IFAM) in Bremen developed a new bio- material. It promotes bone growth and is biodegra- dable. They presented a screw which is biocom- patible and also biodegradable over time. The engineers at IFAM have developed a granulate from the biomaterials which can be precision-processed using conventional injection molding methods, obviating the need for any post-processing such as milling.

The complex geometry is achieved in a net-shape process, producing a robust screw. The properties of this prototype come very close to those of real

Surgeons use interferential screws to fasten cruciate ligaments in the knee. From the left: made of polylac- tic acid, hydroxylapatite and medical stainless steel. © Fraunhofer IFAM, Germany

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