Photostimulated Spiropyran for Instantaneous Visualization of Thermal Field Distribution and Flow Pattern

Abstract

The study of thermocapillary convection has attracted the attention of researchers due to the importance in both fundamental and industrial aspects. To trace the state of flows in real time during thermocapillary convection, the development of imaging methods and tools is essential. Here we use a benzothiazole unit-bearing spiropyran (BS1-SP) as a photostimulated indicator to visualize the details of instantaneous temperature distribution and flow pattern on the surface of volatile solvent simultaneously with a high spatial and temporal resolution during convection. This work provides insights into dynamic self-organization and thermohydrodynamics taking place in evaporating systems, and a useful tool to study these behaviors.

ESIPT‐Inspired Dual‐Mode Photoswitches with Fast Molecular Isomerization in the Solid State

“…Based on the rational design strategy, a series of experimental compounds and control compounds were synthesized in a facile manner according to the procedures reported in our previous studies [2b, 18] (Figure 1A). Briefly, taking OH‐pht as an intermediate reactant, the Duff reaction was used to obtain AH‐pht and DiAH‐pht , which were further employed as precursors to react with iodomethane to obtain the first control compound C1 .…”

Intermolecular through‐space charge transfer enabled by bicomponent assembly for ultrasensitive detection of synthetic cannabinoid JWH‐018

“…[60,61] Furthermore, other than molecular architecture modulation, the molecular self-assembly behavior of the nonvolatile solute could be further regulated by the control of molecular motion or diffusion dynamics induced by the co-occurred droplet evaporation. [62,63] As an open thermodynamic system for mass, momentum, and energy transfer [64] with three phases involved, the evaporation of a sessile droplet on a solid substrate is a diffusion-controlled process affected by the solvent composition, surrounding atmosphere, the wetting properties of substrates, external forces, and so forth. [65] Effective regulation of the droplet evaporation dynamics and the simultaneous self-assembly has been achieved to obtain well-defined morphology and patterns, such as coffee rings, [66] yet study on utilizing the droplet evaporation to manipulate photophysical properties of the self-assembly and its sensing application is rare.…”

Photoswitchable spiropyran molecules for specific sensing of thiols and fluorescent inks

“…11 Compared to other organic small-molecule fluorescent probes, spiropyrans and their derivatives are highly valued by researchers as they demonstrate excellent photoswitching properties, low photobleaching kinetics, and minimal phototoxicity. [12][13][14][15] The photochromic response observed in spiropyrans usually occurs upon exposure to UV light in which the photoexcitation of the unconjugated colorless spiropyran with UV light leads to the cleavage of the C-O spiro bond and results in ring-opening, thereby inducing an electronic rearrangement and formation of a highly conjugated zwitterionic merocyanine form with a wide red emission band. 16 The reversible spiropyran rearrangement can be controlled by heating of irradiation particles by visible light.…”