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DNP-enhanced {1H-}27Al CP MQMAS NMR spectrum of γ-alumina, recorded at 18.8 T, a sample temperature of ∼125 K, and with a MAS frequency of 24 kHz. Above, a {1H-}27Al CP NMR spectrum of γ-alumina recorded under the same conditions as a comparison. The γ-alumina was impregnated with a 5 mM AsymPolPOK, 2 M 13C-urea, d8-glycerol/D2O/H2O (6:3:1; v:v) solution. εon/off = 38 (see Figure S17).
