β-cyclodextrin and carbonyl iron-based supramolecular gels: microstructure and magnetorheology - Archive ouverte HAL
Article Dans Une Revue Smart Materials and Structures Année : 2024

β-cyclodextrin and carbonyl iron-based supramolecular gels: microstructure and magnetorheology

Résumé

This study presents the development of supramolecular gels composed of β -cyclodextrin ( β -CD) and carbonyl iron (CI) particles, offering an effective combination of enhanced stability and magnetorheological (MR) responsiveness. Unlike conventional CI-based systems prone to rapid sedimentation, the β -CD matrix in this composite prevents particle aggregation, demonstrating sedimentation stability for up to 12 h without visible sedimentation. Microstructural analysis using small-angle x-ray scattering and scanning electron microscopy revealed that the inclusion of CI particles significantly modifies the gel structure, enabling a highly tunable MR response. Rheological tests demonstrated a critical magnetic field ( H C ) as low as ∼150 Oe, indicating an early magnetic response, which leads to a significant increase in viscosity and yield stress under magnetic influence. A phase diagram is proposed to explain the underlying MR mechanisms. This novel system offers a new approach to designing magneto-responsive materials with controlled mechanical properties, making them suitable for various smart material applications.
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Dates et versions

hal-04823392 , version 1 (06-12-2024)

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Surya Narayana Sangitra, Claire Hotton, Ioanna Chazapi, Erwan Paineau, Ravi Kumar Pujala. β-cyclodextrin and carbonyl iron-based supramolecular gels: microstructure and magnetorheology. Smart Materials and Structures, 2024, 34 (1), pp.015010. ⟨10.1088/1361-665X/ad9677⟩. ⟨hal-04823392⟩
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