6533b82bfe1ef96bd128d87e
RESEARCH PRODUCT
Steric stabilization of modified nanoclays triggered by temperature.
Filippo ParisiGiuseppe LazzaraGiuseppe CavallaroStefana Miliotosubject
NanotubeHydrodynamic radiusSurfaces Coatings and FilmNanotechnology02 engineering and technologyengineering.material010402 general chemistryζ-potential01 natural sciencesHalloysiteLower critical solution temperatureNanomaterialsBiomaterialsColloidAdsorptionColloid and Surface Chemistrychemistry.chemical_classificationHydrodynamic radiuElectronic Optical and Magnetic MaterialHalloysitePolymer021001 nanoscience & nanotechnologyBiomaterial0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialschemistryChemical engineeringengineeringNanoclayPNIPA-NH20210 nano-technologydescription
Halloysite clay nanotubes were modified through the adsorption of poly(N-isopropylacrylamide)-amine terminated (PNIPA-NH2) onto the external surface by exploiting electrostatic interactions at pH=6. In spite the amount of attached polymer is rather low (1 wt%), the properties of the nanotubes are deeply modified. The apparent specific volume and isentropic compressibilities of the hybrid nanomaterial dispersed in water evidenced the transferring of the termosensitive property from the polymer to halloysite. The hydrodynamic radius as well as the ζ-potential of the nanohybrid are consistent with the attachment of a positively charged polymer onto the negative surface of the nanotube. The colloidal stability was strongly enhanced in the temperature domain below the lower critical solution temperature. This methodology endowed to obtain hollow nanotubes with a stimuli-responsive corona.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-07-30 | Journal of colloid and interface science |