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
6.2 Energy Storage
For medical nanorobots, onboard volume is a precious and limited commodity. Viscous forces dominate inertial and gravitational forces, so mass is almost irrelevant. Hence energy stored per unit volume (joules/m3) is an appropriate figure of merit for nanoscale energy storage devices.
Energy storage devices may be required to maintain temporary power during subsystem failures, metamorphic transitions, or during temporary unavailability of environmental energy resources; to provide supplementary supplies during brief periods of overcapacity consumption; or to buffer normal energy usage among subsystems generating large fluctuations. Stored energy may also be used to power short-lived medical nanodevices on missions of limited duration. For example, a 1 micron3 storage device with storage density of 2 kT/nm3 (~107 joules/m3) contains sufficient energy to power a 10 picowatt (pW) nanorobot for ~1 second. Chemical storage devices (providing up to 1011 joules/m3; Section 6.2.3) may extend this duration to 104 sec (~3 hours).
Last updated on 18 February 2003