Based on the conditions under which this measurement is performed, q is calculated to be 0.0303 nm -1 . As can be seen from Table , the diffusivity calculated from the single exponential fit is very close to that of the method of cumulants. Minor differences in the calculated diffusivity are attributed to the differences in fitting technique as the method of cumulants used by the Zetasizer software also calculates the relative dispersity of the sample. Based on this comparison, it is reasonable to conclude that the results generated by the Zetasizer software package are an accurate representation of the data and can be used to calculate the relative size and dispersity of the bottlebrush polymer.