Calculate the colloidal interaction energy between two colloidal spherical particles of 0.5 micron radius in water at room temperature. Obtain the van der Waals energy from the van der Waals force, using the following expression: FvdW=12h2Aa Similarly, to obtain the electrostatic repulsive energy, use: Fel=2ao2eh Assume A=1.01019J, and the dielectric constant r=80 (typical of calcium carbonate particles in water). Hint: V(h)=hFdh 1. Calculate and plot the interaction energy (energy vs. distance h) for 1-1 electrolyte concentrations of 0.1mM,1mM,10mM and 0.1M, for surface potentials of 150mV,75mV and 30mV. 2. Assuming particles coagulate when the height of the energy maximum is lower than 1kT, for which salt concentrations do the particles coagulate