title: Acoustic recognition of counterions in ion-exchange resins.
abstract: In a coupled acoustic-gravity field, particles are aggregated at a particular position determined by their acoustic properties, such as density and compressibility. The observation of the aggregation of cation-exchange resin particles in this field has confirmed that the types of countercations strongly affect the behavior of the particles. Detailed analyses have revealed that the different behavior comes not from the density of the resins but from their compressibility as far as H+- and NBu4+-form cation-exchange resins are concerned. Since these resins are aggregated at the different positions, we can gain information of counterions from aggregation coordinates. Counterions can thus be recognized through the observation of the aggregation behavior of resin particles in the field without chemical analyses routinely employed in ion-exchange studies.
authors.forename: Shungo
authors.initials: S
authors.lastname: Hirawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Masudo
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Okada