Phase Behavior, Structure and Dynamical Arrest of Charged Nanoplatelets Covered With a Thermo-Responsive Shell - Archive ouverte HAL
Article Dans Une Revue Soft Matter Année : 2024

Phase Behavior, Structure and Dynamical Arrest of Charged Nanoplatelets Covered With a Thermo-Responsive Shell

Résumé

Nanoplatelets open up a wide range of possibilities for building macroscopic advanced materials with novel properties linked to their shape anisotropy. A challenge consists of controlling the order of positioning and orientation in three dimensions by assembly to exploit the collective properties at the macroscale. To date, most of the research effort has been focused on controlling the phase behavior of hard nanoplatelets. In this letter, we tackle the case of core/shell nanometric platelets, composed of an athermal mineral core (laponite clay) and a polymeric soft shell (triblock copolymer) whose conformation can be thermally modulated. The structural and mechanical investigations show that the behavior of these nanoplatelets allows the emergence of a nonbirefringent phase, composed of random stacks of nanoplatelets, in a relatively low concentration range. The thermosensitive nature of the shell prompts a transition from random stacks to columnar stacks, associated with a steep increase of viscoelasticity and birefringence yielding highly viscoelastic birefringent suspensions. The sequence of these textures were recently predicted numerically, including in the ionic strength range of the phase diagram investigated here. Our results, based on an easy-to-implement process, open up a new route for controlling the assembly of nanoplatelets at the nanoparticle scale.

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Dates et versions

hal-04677680 , version 1 (26-08-2024)

Identifiants

  • HAL Id : hal-04677680 , version 1

Citer

Imane Boucenna, Florent Carn, Ahmed Mourchid. Phase Behavior, Structure and Dynamical Arrest of Charged Nanoplatelets Covered With a Thermo-Responsive Shell. Soft Matter, In press. ⟨hal-04677680⟩
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