  Previously, the Maxwell equal-area law has been used to discuss the
conditions satisfied by the phase transition of charged AdS black holes with
cloud of string and quintessence, and it was concluded that black holes have
phase transition similar to that of vdW system. The phase transition depends on
the electric potential of the black hole and is not the one between a large
black hole and a small black hole. On the basis of this result, we study the
relation between the latent heat of the phase transition and the parameter of
dark energy, and use the Landau continuous phase transition theory to discuss
the critical phenomenon of the black hole with quintessence and give the
critical exponent. By introducing the number density of the black hole
molecules, some properties of the microstructure of black holes are studied in
terms of a phase transition. It is found that the electric charge of the black
hole and the normalization parameter related to the density of quintessence
field play a key role in phase transition. By constructing the binary fluid
model of the black hole molecules, we also discuss the microstructure of
charged AdS black holes with a cloud of strings and quintessence.
