Enhancement of dye dispersibility in silica hybrids through local heating induced by the Imidazolium group under microwave irradiation

Abstract

We prepared imidazolium-containing silica hybrid films by sol-gel reactions of 1-(trimethoxysilylpropyl)-3-methylimidazolium chloride under microwave irradiation. Furthermore, we incorporated hydrophobic dyes such as pyrene and 1-pyrenecarboxaldehyde into the silica hybrids, and we investigated the dispersion behaviors of these dyes in the matrices. The local heating of the imidazolium groups under microwave irradiation was suggested to contribute to the enhancement of reaction rates in the sol-gel process. Finally, we achieved the incorporation of higher dye concentrations in the silica hybrids compared with those achieved with conventional heating.

Preparation of photo-responsive hybrid materials based on hydrogels involving imidazolium-presenting gold nanoparticles

“…1 − 3 Recently, using hybridization to fix unstable nanostructures or short-lived states inside materials has allowed the achievement of a number of interesting properties, such as oxygen-resistant phosphorescence 4 and multi-colored emissions. 5,6 Moreover, by employing heteroatomcontaining functional units called as the element blocks, 7 the introduction of new functionalities was accomplished, including the ability to generate heat under microwave irradiation. 8,9 Furthermore, the disadvantages of conventional hybrids, such as low conductivity, were overcome.…”

Optical, Electrical and Thermal Properties of Organic–Inorganic Hybrids with Conjugated Polymers Based on POSS Having Heterogeneous Substituents

“…Thus, hybrid formation is currently recognized as a valid strategy for enhancing durability of organic products including conjugated polymers. However, hybrid formation is usually performed via the sol-gel reaction in polar solvents with acid or base catalysts [4,5,6]. Thereby, aggregation followed by generation of inhomogeneity and degradation of conjugated polymers is often induced during the sol–gel reactions.…”

On-demand easy peeling of acrylic adhesives containing ionic liquids through a microwave irradiation stimulus

“…36,37 The microwaveassisted local heating leads to researches on media in organic reaction and nanoparticle coated ILs. [38][39][40] Herein, we focused on the microwave-assisted heating of ILs and microwave-responsive "ondemand-peeling" adhesives. When the size of adhered specimen is large, heating the whole specimen is difficult, whereas the selective local heating in microwave oven can limit the heated region of the adhesives.…”