Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 20, Pages 10352-10356Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am403449j
Keywords
H-1 solid-state NMR; interfacial water; TiO2 nanoparticles
Funding
- National Basic Research Program of China (973 Program) [2012 CB 821503]
- National Natural Science Foundation of China [51133002, 21174062, 21274060, 21274059, 21074052]
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Understanding interfacial water behavior is essential to improving our understanding of the surface chemistry and interfacial properties of nanomaterials. Here using H-1 solid-state nuclear magnetic resonance (H-1 SSNMR), we successfully monitored ligand exchange reaction between oleylamine (OLA) and adsorbed water on titanium dioxide nanoparticles (TiO2 NPs). Three different types of interfacial waters with different reactivities were distinguished. The mobility of the adsorbed water molecules was characterized by dipolar filtered H-1 SSNMR. Our experimental results demonstrate that the adsorbed water can be categorized into three different layers: (i) rigid water species with restricted mobility closest to the surface of TiO2 NPs, (ii) less mobile water species weakly confined on TiO2 NPs, and (iii) water molecules with high mobility. Water in the third layer could be replaced by OLA, while water in the first and second layers remained intact. The finding that the interfacial water with the highest mobility has the strongest reactivity has guiding significance for tailoring the hydrophilic and hydrophobic properties of TiO2 NPs.
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