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Interconnected channel subdivision and flow behavior in sintered glass bead–fiber mixed filters
Original title: Interconnected channel subdivision and flow behavior in sintered glass bead–fiber mixed filters
Summary
Scientists engineered a new type of filter material by mixing glass beads and fibers, creating tiny, tunable channels that slow down and redirect water flow instead of letting it rush straight through. This twisty, obstacle-filled path helped trap microplastic particles more effectively, especially when combined with an extra mineral coating — an early but promising step toward better water filters that could reduce our exposure to microplastics in drinking water.
Glass bead–fiber mixed porous materials with tunable interconnected channel structures were prepared, and the influence of fiber-induced channel subdivision on water-flow behavior was investigated using X-ray CT–based analyses. Incorporation of milled glass fibers into interconnected channels formed between fused glass beads effectively subdivided relatively large channels. As a result, the number of pores increased and the average pore size decreased without major changes in overall porosity. CT-based flow analyses revealed that increasing fiber content reduced local water velocity and generated heterogeneous preferential flow pathways associated with channel subdivision. Tracer-particle analysis further indicated limited lateral displacement within the porous structures, indicating restricted transport pathways despite local flow heterogeneity. These results demonstrate that subdivision of interconnected channels influences local transport behavior in sintered glass-based porous materials. Preliminary microplastic capture experiments further indicated that incorporated fibers and additional layered double hydroxide deposition contributed to particle retention within the interconnected channels. Thus, this study provides a basis for designing structure-flow relationships in sintered glass-based porous materials.