ABSTRACT
Local adhesion and rheological properties of dry powders or biofibre networks are the determining parameters for the behaviour of these materials at the macroscopic scale, and the effect of relative humidity on the formation of capillary condensates between contact points has long been known to play a key role. Direct measurement of the forces between particles or fibres, however, has only rather recently been
feasible, since the development of the colloid probe technique [1], and so the quantification of these parameters has been lacking.
