(181u) Exploring Solvent-Free Fabrication of MOF-Fiber Composites Using Aerosol Assisted Particle Deposition

The rising interest in sustainable practices is driving the development of multifunctional materials with solvent-free fabrication methods. Metal-Organic Frameworks (MOFs) represent a class of porous multifunctional materials characterized by their high surface area, tunable pore size, and three-dimensional network structure. MOFs have diverse applications in fields such as gas storage, separation processes, catalysis, sensing, environmental remediation, drug delivery and energy storage. MOFs primarily exist in agglomerated powder form, necessitating their integration into a suitable substrate to expand their utility. Fibrous mats with their highly flexible, lightweight, and breathable structures, present themselves as prime candidates for this purpose. Conventional methods rely on the utilization of organic solvents in the fabrication of MOF-fiber composites. In this study, we present a solvent-free method for the deposition of MOFs onto fibrous mats, facilitated by an in-house aerosolizer designed for breaking agglomerates and ensuring uniform dispersion of MOF particles. Specifically, our investigation focuses on ZIF-8 MOF (Surface area 1800 m²/g) integrated on a unique sheath-core structure of fibers. The aerosolized MOF particles are directed onto the fibrous mat, where they adhere through weak intermolecular interactions. The key parameters influencing the deposition process, including aerosolization conditions, substrate morphology, particle size (0.5-10 µm) and concentration, are systematically investigated to optimize coating uniformity, coverage, and adhesion strength. The characterization of the composites involves quantitative analysis conducted through thermogravimetric analysis and BET surface area testing, supplemented by microscopic techniques such as SEM to qualitatively understand the MOF deposition on the mats. Another key aspect of this study involves understanding the fundamental interactions between MOFs and polymers. This analysis provides insights into the molecular-level interactions governing the compatibility and stability of MOF-polymer composites. Overall, we will discuss the intricacies of our innovative fabrication method, detailing its optimization, comprehensive characterization, and wide-ranging applications of the resulting composites.