text: where γ is the liquid-gas surface tension and f (h) is a local free energy term that describes the 
  
  wettability of the surface. Since µ corresponds to a chemical potential, the term µh may either bias 
  
  the system towards the liquid or towards the gas state. The variation of F w.r.t. h gives the pressure. 
  
  It contains the curvature (Laplace) pressure −γ∆h and the disjoining pressure Π(h) = −∂hf (h). 
  
  Many different forms for the latter are in use (see, e.g., Refs. [4, 8, 63, 70–73]). 
  
  For the present system a thin ﬁlm description using Eq. (1) is not appropriate because the nanopar- 
  
  ticles are not taken into account. However, under certain conditions one can augment equation (1) 
  
  for the evolution of the ﬁlm thickness by coupling it to an equation for the evolution of the mean 
  
  particle concentration. The resulting model is able to describe the behaviour of an evaporating so- 
  
  lution on the meso- and macroscale. Such an approach is brieﬂy discussed below in Section III C. 
  
  We should expect such a model to describe the mesoscopic dewetting front discussed above. How- 