4.6 Article

Effect of Polymer Length on the Adsorption onto Aluminogermanate Imogolite Nanotubes

期刊

LANGMUIR
卷 37, 期 32, 页码 9858-9864

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.1c01549

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  1. LabEx Tec21 (Investissements d'Avenir) [ANR-11-LABX-0030]
  2. PolyNat Carnot Institut (Investissements d'Avenir) [ANR-16-CARN-0025-01]
  3. Glyco@Alps programme (Investissements d'Avenir) [ANR-15-IDEX-02]
  4. University of Palermo

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This study investigates the adsorption mechanism of nonionic polymers onto aluminogermanate imogolite nanotubes using nanoisothermal titration calorimetry. The results show that the affinity towards the nanotube surface is driven by enthalpy and strongly influenced by the polymer chain length. Small-angle neutron scattering and rheology techniques were used to probe the polymer configuration and flow properties of the complexes, providing insights for advanced applications.
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.

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