Precision experiments reveal gaps in van der Waals theory
(PHYSorg.com Chemistry)

The discovery of graphene, with its high strength-to-weight ratio, flexibility, electrical conductivity, and ability to form an impenetrable barrier, led to an explosion of interest in 2-D solids. Weak, long-range interactions give 2-D solids some of their most interesting behaviors; therefore, understanding these interactions is crucial for further developing these materials. However, experimental support for theoretical modelling of the van der Waals interactions that hold these materials` layers together has been wanting.