‘Smart’ gel turns solid to liquid with UV light: How does it work?
Scientists at the University of Birmingham have developed a multi-responsive smart gel that can switch between solid-like and liquid-like states when exposed to ultraviolet light, heat or acid. Built using foldamer molecules and palladium ions, the material could eventually support advances in drug delivery, smart sensors and catalysis. Advanced NMR techniques also enabled detailed atomic-level…
University of Birmingham scientists have created a smart material capable of switching between solid and liquid states in response to different external triggers. This advancement, detailed in the Journal of the American Chemical Society, could lead to innovations in drug delivery, sensing, catalysis, and advanced materials.
The multi-responsive gel, built from synthetic molecules called foldamers, changes depending on whether it encounters ultraviolet light, heat, or acid. UV light alters its molecular structure, causing the gel to transition into a liquid state, which can be reversed by applying heat. Acid breaks the connections holding the structure together, providing an alternative method for changing states.
The material's molecular network is composed of helical foldamer molecules linked by palladium ions, which function as four-way molecular junctions to form an extended network. This network traps liquid, giving the material its gel-like properties. When exposed to UV light, light-sensitive components within the foldamers change shape, causing the visible transition from solid-like to liquid state.
Heating reassembles the network, while acid disrupts the bonds between the foldamers and palladium ions, effectively dismantling the material.
The researchers also converted the gel into a water-based hydrogel without destroying its structural integrity, a development that holds particular promise for biomedical applications. Hydrogels can retain substantial amounts of water while maintaining their structure and are crucial in biotechnology, medicine, and drug delivery. A material capable of responding to specific triggers could potentially be used for controlled release of therapeutic compounds or systems reacting to environmental changes.
While the research is still at a fundamental stage, the ability to incorporate multiple responses into a single material could prove valuable in developing smart sensors, switchable catalysts, and systems designed to capture and release specific molecules. Potential applications include targeted drug delivery, biomedical materials, chemical manufacturing, and responsive sensing technologies.
The detailed atomic-level investigation of the gel's assembly significantly reduced the time required for research, from years to hours, demonstrating the potential of designing substances with controlled properties through molecular interactions.
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