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pair_colloid_cc.tex
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			\begin{document}

			\begin{eqnarray}
			U_A &=& - \frac{A}{6} \left[
			\frac{2 a_1 a_2}{r^2-\left(a_1+a_2\right)^2}
			+ \frac{2 a_1 a_2}{r^2 - \left(a_1 - a_2\right)^2}
			+ \mathrm{ln}
			\left(
			\frac{r^2-\left(a_1+a_2\right)^2}{r^2-\left(a_1-a_2\right)^2}
			\right)
			\right] \nonumber \\
			\nonumber \\
			U_R &=& \frac{A}{37800} \frac{\sigma^6}{r}
			\left[ \frac{}{} \right. \nonumber \\
			&&\qquad \frac{r^2-7r\left(a_1+a_2\right)+6\left(a_1^2+7a_1a_2+a_2^2\right)}
			{\left(r-a_1-a_2\right)^7} \nonumber \\
			&&\qquad +\frac{r^2+7r\left(a_1+a_2\right)+6\left(a_1^2+7a_1a_2+a_2^2\right)}
			{\left(r+a_1+a_2\right)^7} \nonumber \\
			&&\qquad -\frac{r^2+7r\left(a_1-a_2\right)+6\left(a_1^2-7a_1a_2+a_2^2\right)}
			{\left(r+a_1-a_2\right)^7} \nonumber \\
			&&\qquad \left. -\frac{r^2-7r\left(a_1-a_2\right)+6\left(a_1^2-7a_1a_2+a_2^2\right)}
			{\left(r-a_1+a_2\right)^7}
			\right] \nonumber \\
			\nonumber \\
			U &=& U_A + U_R, \qquad r < r_c \nonumber
			\end{eqnarray}

			\end{document}