Nanomedicine, Volume I: Basic Capabilities
© 1999 Robert A. Freitas Jr. All Rights Reserved.
Robert A. Freitas Jr., Nanomedicine, Volume I: Basic Capabilities, Landes Bioscience, Georgetown, TX, 1999
4.6.5 Spatial Thermal Gradients
Two (200-400 nm)3 thermal sensors located at either end of a 1-micron nanorobot can detect temperature changes as small as 106 K per micron, a ~1 kelvin/m spatial gradient. The maximum detectable gradient in nanomedical systems would involve adjacent measurements differing by ~100°C, a peak spatial gradient of ~108 kelvins/m. The detection event must be completed before the two sensors can thermally equilibrate, e.g., tmeas < tEQ = L2 CV / Kt (Eqn. 10.24). If the material between the sensors is mostly diamondoid, then tEQ ~ 10-9 sec; if mostly water, then tEQ ~ 10-5 sec, for L = 1 micron.
Last updated on 17 February 2003