FTIR spectra of aqueous 0.5% P87/ A8 NPs. Data with: (a) corresponding as-prepared solution subtracted to isolate spectral changes due to pre-magnetization; (b,c) as-prepared, 0% NP data subtracted to examine spectral changes due to both pre-magnetization and NP inclusion. (c) Deconvolution of pre-magnetized, 5% NP solution using Gaussians for each of the five water-water H-bonding modes (see SI.15.2): DDA (yellow – –); DDAA (light blue -⋅-); DA (green --), DDA (dark blue -⋅⋅-), and free OH (orange ⋅⋅⋅), plus a correction for changes in PNIPAM backbone intensities (pink -⋅-). Summed fit is in solid red.