6533b857fe1ef96bd12b502c

RESEARCH PRODUCT

Effect of Polymer Length on the Adsorption onto Aluminogermanate Imogolite Nanotubes

Giuseppe CavallaroFrédéric PignonErwan PaineauGiuseppe LazzaraLeonardo Chiappisi

subject

NanotubeMaterials scienceImogolite02 engineering and technologyCalorimetryNeutron scattering010402 general chemistry01 natural sciencesSettore CHIM/12 - Chimica Dell'Ambiente E Dei Beni Culturalichemistry.chemical_compoundAdsorptionRheologyElectrochemistryGeneral Materials ScienceComputingMilieux_MISCELLANEOUSSpectroscopySettore CHIM/02 - Chimica Fisicachemistry.chemical_classificationQuantitative Biology::BiomoleculesSurfaces and InterfacesPolymerPolyethylene021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesCondensed Matter::Soft Condensed MatterchemistryChemical engineeringImogolite nanotubes SANS ITC PEGs[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]0210 nano-technology[PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]

description

This study evidences the adsorption of model nonionic polymers onto aluminogermanate imogolite nanotubes, attractive porous nanofillers with potential molecular loading and release applications. We resolve the underlying mechanisms between nanotubes and polyethylene glycols with different molecular weights by means of nanoisothermal titration calorimetry. The analysis of the results provides a direct thermodynamic characterization, allowing us to propose a detailed description of the energetics involved in the formation of polymer/imogolite complexes. The affinity toward the nanotube surface is enthalpy-driven and strongly depends on the polymer chain length, which significantly affects the polymer configuration and the flow properties of the resulting complexes, probed by small-angle neutron scattering and rheology, respectively. These findings open new avenues for the rational design of these hybrid mixtures for advanced applications.

10.1021/acs.langmuir.1c01549http://hdl.handle.net/10447/539019