Question: 2. Consider two identical colloidal spherical particles separated by distance x: - - - Show that the expression for the surface potential energy interactions between

2. Consider two identical colloidal spherical particles separated by distance x: - - - Show that the expression for the surface potential energy interactions between these two particles with radius a and center-to-center separation r U SO sphere-sphere + 12 -4a -2 -4a- can be reduced to U(r) = - DA , for small separations between the two particle surfaces. 12x

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