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PP7.06 - Attenuated Total Reflectance Infra Red (ATR IR) Spectroscopy Studies of the Nanodiamond - Solution Interface 
April 24, 2014   11:00am - 11:15am

We have used Attenuated Total Reflectance Infra Red (ATR IR) spectroscopy to study changes to the surface vibrational spectra of nanodiamond (ND) particles while they are immersed in different solutions. ATR IR works on the principle of total internal reflection, where incident IR radiation is directed through optics to a diamond prism, where it undergoes total internal reflection at the surface. However some of the IR radiation penetrates a region ca. 1 μm above the prism as an evanescent wave, where it can interact with an immobilised solid sample or a solution. If a solvated solid nanoparticle film is immobilised on the prism a vibrational spectrum of the nanoparticle material is obtained and as the IR does not have to pass through a substantial solvent layer absorption by the solvent is minimised. Indeed use of nanoparticulate materials, such as nanodiamond, allows for exquisite sensitivity towards surface processes, thanks to the high surface area.We have monitored changes to the spectrum of solvated nanodiamond over time in water and can see changes in orientation and hydrogen bonding of surface water that take place over approximately a one hour time period as the film becomes increasingly solvated. There is some evidence also of hydrolysis of water on the surface of the nanodiamond and its reaction with the surface. Additionally we see evidence for reactions between surface functional groups. These observations are confirmed by performing the same experiment in deuterated water, but with some interesting differences. We have introduced both hydrophilic and hydrophobic molecules into the solution, where we can monitor the interaction of the molecules with the nanodiamond surface, primarly through monitoring disruption of hydrogen bonding at the nanodiamond surface and displacement of surface solvating water molecules. This fundamental study has relevance to many proposed applications of nanodiamond, where its interaction with solvents and dissolved species is of importance.

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