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Experimental Materials The hydrophobic silica nanoparticles (H18) were kindly supplied by Wacker Chemie. Maleic and succinic acids (certified purities ≥99%), ruthenium catalyst (5 wt% loading on alumina, reduced) and deuterium oxide (for 1 H-NMR, 99.9 atom % D) were purchased from Sigma-Aldrich. Hydrogen gas (high purity, 99.995% minimum) was purchased from BOC Gases. The morphologies of the various dry water (DW) samples were observed using an Olympus CX41RF Microscope, fitted with a Linkamdoi:10.1039/b922508k fatcat:yfelzohudjgh5m7ugnsf3umrna