In Situ Tracking of Wetting‐Front Transient Heat Release on a Surface‐Mounted Metal–Organic Framework

Abstract

Transient heat generation during guest adsorption and host–guest interactions is a natural phenomenon in metal–organic framework (MOF) chemistry. However, in situ tracking of such MOF released heat is an insufficiently researched field due to the fast heat dissipation to the surroundings. Herein, a facile capillary‐driven liquid‐imbibition approach is developed for in situ tracking of transient heat release at the wetting front of surface‐mounted MOFs (SURMOFs) on cellulosic fiber substrates. Spatiotemporal temperature distributions are obtained with infrared thermal imaging for a range of MOF‐based substrates and imbibed liquids. Temperature rises at the wetting front of water and binary mixtures with organic solvents are found to be over 10 K with an ultrafast and distinguishable thermal signal response (<1 s) with a detectable concentration limit ≤1 wt%. As an advancement to the state‐of‐the‐art in trace‐solvent detection technologies, this study shows great prospects for the integration of SURMOFs in future sensor devices. Inspired by this prototypal study, SURMOF‐based transient heat signal transduction is likely to be extended to an ever‐expanding library of SURMOFs and other classes of surface‐grafted porous materials, translating into a wide range of convenient, portable, and ubiquitous sensor devices.

Energy Transfer in Metal–Organic Frameworks for Fluorescence Sensing

“…MOFs were discovered in the late 1950s, but their enormous applications remained unknown for a long time. − Research on MOFs received momentum in the 1990s because of their simple yet intriguing structures and newly discovered properties. , For instance, their high porosity and surface areas and excellent structural and functional tunability make them one of the most attractive materials in the chemistry and materials science communities. ,− Luminescent metal–organic frameworks are a subclass of MOFs, ,, with controllable and tunable photophysical and photochemical properties via alternating the structure of organic linkers, metal clusters, and guest species. The emissions of LMOFs can be roughly divided into four categories, organic linker-centered emission, metal-centered emission, charge transfer induced emission, and guest-centered emission (Figure ).…”

Reactive Multilayer Coating As Versatile Nanoarchitectonics for Customizing Various Bioinspired Liquid Wettabilities

“…Li et al 52 explored the LbL assembly between the ethanol solution of Cu(II) (copper acetate monohydrate; metal) and trimesic acid (H 3 BTC; ligand) to develop the coordination through an organic linker that resulted in the formation of a metal−organic framework (MOF) (copper 1,3,5-benzenetricarboxylate, [Cu 3 (BTC) 2 ], globally known as HKUST-1) denoted as surface-mounted HKUST-1 (SURHKUST-1) on pretreated cellulosic fiber paper. Due to the inherent superhydrophilicity of the MOF (with a WCA of 0°), the multilayer construction is capable of absorbing a large amount of water.…”

Surface-Oriented Assembly of Cyclodextrin Metal–Organic Framework Film for Enhanced Peptide-Enantiomers Sensing

“…Since Stoddart, Yaghi, and coworkers Similar challenges are encountered in other contexts, e.g. when integrating MOFs into devices [25][26][27][28] . In many cases, the availability of well-defined, oriented MOF thin films has played a key role in the areas of adsorption and separation, [29][30][31][32] catalysis, 33,34 as well as for fabricating optical/electronic sensors and devices [35][36][37][38][39][40][41][42][43][44][45] .…”