NANO INVASION CONTINUES

摘要

There doesn't seem to be any limit to the number of researchers who want to inject nanoscale things into our bloodstreams, and the trend continues at Purdue University. The idea of sending in little rod-like or spherical things and illuminating them isn't new, but an improved approach - developed by Prof. Ji-Xin Cheng and associates - shines near-infrared laser pulses through your skin to excite tiny gold-silver alloy "nanocages" and other particles, and generate images. The particles -about 40 nm wide - are stimulated by a phenomenon called "three-photon luminescence" which employs 80 million laser pulses per second to illuminate various tissues or organs.