The surface chemistry of diamond

The aqueous electrophoretic deposition (EPD) of diamond–diamond laminates

“…O-H stretch [65] The spectrum reveals that hydroxyl, carbonyl and hydrocarbon groups are present which correlates well with literature [66]. In an attempt to achieve polar surface groups, the diamond powder was oxidized to introduce oxygen containing species onto the surface.…”

“…Hartley [66] suggest that the primary groups found on the surface of diamond are a combination of epoxide, carbonyl, carboxyl and hydroxyl groups ( Figure 5.4) as well as saturated and unsaturated hydrocarbons. Reactive unsaturated covalent bonds present on the diamond give rise to its rich surface chemistry.…”

“…Reactive unsaturated covalent bonds present on the diamond give rise to its rich surface chemistry. These bonds react with water and oxygen to form a number of oxygen containing surface groups [66]. Thus the charge developed on the surface of these particles upon immersion in a liquid are due to ionization of these groups in addition to selective ion adsorption from the solution [74].…”

Ice/Water Interface: Zeta Potential, Point of Zero Charge, and Hydrophobicity

“…For instance, it was found that after methylation diamond exhibits more negative zeta potential values (20). Chibowski and Waksmundzki (21,22) also found that the negative zeta potential of sulfur and Teflon in water increased with a progressively increasing precoverage of the surface with n-heptane or nhexane, respectively.…”

“…Diamonds and bacteria are also hydrophobic but their hydrophobicity is much lower than that of hydrocarbons because the contact angle of bacteria is usually only between 10°and 20° (19) and for the diamond sample shown in Fig. 4, it is between 2°and 12° (20).…”