An ab inirio approach to simulate the interactions and correlations of charged rodlike colloidal panicles is proposed. which combines molecular dynamics for the mesoscopic rods and classid density-functional theory for the microscopic counlerions. Many-lmdy interrod interactions induced by non-linear counterion scrtening are systematically included in this approach. It is found that these forces can satisfactorily be described by an effective Yukawasegment madel which, however, differs in

more »

... l from the traditional Derjaguin-Landau-Verweybverbeek theory.