Investigating the swelling behavior of superabsorbent polymer microparticles (SAP-MPs) at a single-particle level using traditional methods is constrained by low resolution and insufficient real-time data, especially for particles smaller than 300 µm. To address these challenges, a novel microfluidic device capable is developed of real-time, high-precision single-particle analysis. This platform hydrodynamically traps individual SAP-MPs, enabling continuous monitoring of their swelling dynamics under controlled conditions. SAP-MPs with varying sizes (90-270 µm), crosslinker concentrations (0.25%
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