Application: Critical particle radius for nanocomposite
•Interface conductance and thermal conductivity of the fluid determine a critical particle radius                                
•For particles in water, rc = 3 nm.
•For high thermal conductivity particles, dilute limit of effective medium theory
rc = L/G
r >> rc      DL = (1+3f)L
   r << rc    DL = (1-1.5f)L