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Small-angleneutronscattering(SANS)isusedtoexaminethestructureandcorrelationfunctionsofthecolloidalsilicadispersions.SANSexperimentswerecarried outonneutrondiffractometers,DIIorD17,attheInstitutLaue-Langevin(ILL), Grenoble,onsilicasolwitharadius14nmandatvolumefractionof¢=0.20.The experimentalscatteringintensityversusscatteringvectorcurves,/(Q),fortheseries ofalkalicounterions,bySANS,areshowninFig.17.Itisremarkablethatthereare noeffectsarisingfromthetypeofmonovalentcounterionsevenoveralargerange ofpH(>3).