Small angle neutron scattering has been used to investigate the nature of the adsorption of the alkyl polyoxyethylene ether (C(n)EO(m)) nonionic surfactants on Ludox silica sols. Variations in the adsorbed layer thickness and volume fraction of surfactant in the adsorbed layer with sol type, concentration, temperature, and surfactant type are observed. In particular, the structure of the adsorbed layer of the C(16)EO(6) and C(16)EO(8) surfactants (for which the bulk micellar phase is rodlike micelles) is similar to that found for the C(12)EO(6) and C(12)EO(5) surfactants.