Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 14, 2020
Previous Article Next Article

Heat trapping in a nano-layered microenvironment: estimation of temperature by thermal sensing molecules

Author affiliations

Abstract

We have previously found reversible photo-induced expansion and contraction of organic/inorganic clay hybrids, and even sliding of niobate nano-sheets at the macroscopic level of organic/inorganic niobate hybrids, induced by the molecular photo-isomerization of the polyfluoroalkylated azobenzene derivative (C3F-Azo-C6H) intercalated within the interlayer, which is viewed as an artificial muscle model unit. Based on systematic investigations of the steady state photo-isomerization and transient behavior of the reaction, we comprehended that the phenomena is caused by trapping of excess energy liberated during the isomerization, as well as the relaxation processes upon excitation of azobenzene chromophores in the interlayers of the hybrid. In this paper, quantitative estimation of transient ‘heat’ trapped in various microenvironments has been studied by each co-intercalation of temperature sensing dye molecules – rhodamine B (RhB) or tris(bipyridine)ruthenium(II) chloride (Rubpy) with C3F-Azo-C6H within clay (SSA) nano-layers. The amount of dye molecules co-intercalated was kept to trace amounts that did not alter the bi-layered structure of the hybrid. The temperature of the microenvironment surrounding the probe molecules was estimated from the emission lifetime analysis. The evidently reduced emission lifetimes in C3F-Azo-C6H/SSA and C3H-Azo-C6H/SSA hybrids in the film state, indicated the elevation of temperature of the microenvironment upon excitation of the chromophores, which demonstrated our previous hypothesis rationalizing that the high reactivity of isomerization in the hybrid film state is caused by heat trapping via multi-step dissipation of the excess energy. With the hybrid of a hydrocarbon analogue (C3H-Azo-C6H), a distinct difference in temperature gradient was found to show the crucial role of the perfluoroalkyl chain of the surfactant that traps the excess energy to retard its dissipation leading to three-dimensional morphological motion.

Graphical abstract: Heat trapping in a nano-layered microenvironment: estimation of temperature by thermal sensing molecules

Back to tab navigation

Article information


Submitted
26 Oct 2019
Accepted
14 Feb 2020
First published
26 Feb 2020

Phys. Chem. Chem. Phys., 2020,22, 7201-7209
Article type
Paper

Heat trapping in a nano-layered microenvironment: estimation of temperature by thermal sensing molecules

V. Ramakrishnan, Y. Nabetani, D. Yamamoto, H. Tachibana and H. Inoue, Phys. Chem. Chem. Phys., 2020, 22, 7201
DOI: 10.1039/C9CP05817F

Social activity

Search articles by author

Spotlight

Advertisements