
Counter-clockwise from upper left: water-filled silica pore unit cell; silica pore functionalized with -CH2NH+3(water removed for clarity); expanded view of a -CH2NH2 group in the process of abstracting a proton from H2O; total number of -NH+3 groups as a function of time in two AIMD trajectories, starting with 0 and 11 -NH+3 respectively. The first three panels are AIMD snapshots, and periodic boundary conditions apply in all three directions. Green spheres: Si; red/yellow: O; blue: N; white: H; grey: C.