Negative friction coefficients
Abstract
correspondence To the editor — Deng et al. recently although the two systems are fundamentally e s Th econd example involves the reported that the friction force between different (further details are given in the interaction between silica surfaces coated the tip of an atomic force microscope Supplementary Information). with a hydrophobic, cationic diblock 3,4 and a graphite surface increases with copolymer by means of electrostatic decreasing load. This...