Fig. 2: Bilayer Penetration Experiments.
From: Freestanding region-responsive bilayer for functional packaging of ingestible devices
a (Top) A cross-section of coated test capsules prior to and after penetration. (Bottom) Circuit schematic of the test setup. b Example of the raw impedance data collected during the bath penetration experiments (1x coated sample), showing the sudden drop in impedance, indicating penetration time. c Bar graph of acetate penetration of the bilayer with multiple pH-dependent coating layers (0, 1, 3, 5, 10). The x-axis represents the number of Eudragit FL 30 D-55 layers used in the coating of the sample. The error bars represent the standard deviations. The dotted line at 180 min shows the average gastric emptying time expected with a normal fed system46, and the dotted line at 30 min marks the average gastric emptying time with a fasted system47. d Bar graph of the penetration time in neutral pH. The dotted line at 260 min denotes the average small intestinal emptying time (n = 3)
