Das A, N and Begam, N and Chandran, S and Swain, A and Sprung, M and Basu, JK (2020) Thermal stability and dynamics of soft nanoparticle membranes: Role of entropy, enthalpy and membrane compressibility. In: Soft Matter, 16 (4). pp. 1117-1124.
![]() |
PDF
sof_mat_16-4_1117-1124_2020.pdf - Published Version Restricted to Registered users only Download (3MB) | Request a copy |
Abstract
Nanoparticle based ultra-thin membranes have been shown to have remarkable mechanical properties while also possessing novel electrical, optical or magnetic properties, which could be controlled by tailoring properties at the level of individual nanoparticles. Since in most cases the ultra-thin membranes are coupled to some substrates, the role of membrane-substrate interactions, apart from nanoparticle-nanoparticle interactions become very crucial in understanding their mechanical and thermal stability, as well as their plethora of applications. However, systematic studies in this direction have been conspicuously absent. Here we report thermal stability and the corresponding microscopic dynamics of polymer supported ultra-thin membranes comprising of self-assembled, ordered grains of polymer grafted nanoparticles having tunable mechanical properties. The initially ordered membranes show distinct pathways for temperature induced disordering depending on membrane flexibility as well as on interfacial entropic and enthalpic interactions with the underlying polymer thin film. We also observe contrasting temperature dependence of microscopic dynamics of these membranes depending on whether the graft polymer-substrate polymer interactions are predominantly entropic or enthalpic in nature. Our results suggest that apart from their varied applications, the soft nanoparticle-polymer hybrid membranes are a playground for rich physics involving subtle entropic and enthalpic effects along with the nanoparticles softness, which eventually determine their thermo-mechanical stability. © 2020 The Royal Society of Chemistry.
Item Type: | Journal Article |
---|---|
Publication: | Soft Matter |
Publisher: | Royal Society of Chemistry |
Additional Information: | The copyright for this article belongs to Royal Society of Chemistry. |
Keywords: | Dynamics; Grafting (chemical); Mechanical stability; Nanoparticles; Oxygen permeable membranes; Polymers; Substrates; Temperature distribution; Thermodynamic stability, Enthalpic interactions; Individual nanoparticles; Nanoparticle interaction; Nanoparticle membranes; Polymer-grafted nanoparticles; Substrate interaction; Temperature dependence; Thermomechanical stability, Nanomagnetics |
Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
Date Deposited: | 08 Feb 2023 04:24 |
Last Modified: | 08 Feb 2023 04:24 |
URI: | https://eprints.iisc.ac.in/id/eprint/80051 |
Actions (login required)
![]() |
View Item |