title: Biopolymer-Targeted Adsorption onto Halloysite Nanotubes in Aqueous Media.
abstract: Studies on the adsorption of biopolymers onto halloysite nanotubes (HNTs) in water were conducted. Three polymers with different charges-anionic (pectin), neutral (hydroxypropyl cellulose), and cationic (chitosan)-were chosen. The thermodynamic parameters for the adsorption of polymers onto the HNT surface were determined by isothermal titration calorimetry (ITC). The experimental data were interpreted based on a Langmuir adsorption model. The standard variations in free energy, enthalpy, and entropy of the process were obtained and discussed. Turbidimetry was used to evaluate the stability of functionalized nanoparticles in water. The ζ-potential clarified the surface charge properties of functionalized nanotubes upon polymer adsorption. The interaction of modified nanotubes with polymers led to the formation of a colloidal system with tunable stability and surface properties, which offers different perspectives on new applications of these dispersions, such as carriers for substances to be released in response to external stimuli.
authors.affiliation: Department of Physics and Chemistry, Università degli Studi di Palermo , Viale delle Scienze, pad. 17, 90128 Palermo, Italy.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Bertolino
authors.affiliation: Department of Physics and Chemistry, Università degli Studi di Palermo , Viale delle Scienze, pad. 17, 90128 Palermo, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Cavallaro
authors.affiliation: Department of Physics and Chemistry, Università degli Studi di Palermo , Viale delle Scienze, pad. 17, 90128 Palermo, Italy.
authors.forename: Giuseppe
authors.identifier: 0000-0003-1953-5817
authors.initials: G
authors.lastname: Lazzara
authors.affiliation: Department of Physics and Chemistry, Università degli Studi di Palermo , Viale delle Scienze, pad. 17, 90128 Palermo, Italy.
authors.forename: Stefana
authors.initials: S
authors.lastname: Milioto
authors.affiliation: Department of Physics and Chemistry, Università degli Studi di Palermo , Viale delle Scienze, pad. 17, 90128 Palermo, Italy.
authors.forename: Filippo
authors.initials: F
authors.lastname: Parisi