8041
Equilibrium cluster size is predicted semiquantitatively with a free energy model that balances short - ranged depletion and van der Waals attractions with longer - ranged electrostatic repulsion , as a function of the Au and polymer concentrations .
 Chemical: Au
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Au