Abstract
Understanding of liquid properties in extended nanospaces (10-1,000 nm) is necessary for engineering of nanofluidic devices. We clarified that adsorption of trivalent lanthanoids and electric properties of the solutions drastically changed in extended nanospaces. The results suggested that not only conventional electric double layer (EDL) theory but also effects of hydrated water and other factors in extended nanospaces should be considered for understanding liquid properties. The results are useful for development of novel nanofluidic separation devices.