The effect of hydrophobization of gold quartz crystal microbalance with dissipation (QCM-D) crystals is investigated in terms of its effect on surfactant adsorption at the solid-liquid interface. Hydrophilic gold crystals were modified with octadecanethiol to produce a hydrophobic surface. The gold surface was characterized prior to and after coating. Water contact angles were obtained to confirm hydrophobicity and atomic force microscopy (AFM) images were acquired to confirm surface modification and alkylthiol monolayer morphology. Modified crystals were tested for QCM-D response uniformity and then exposed to surfactant solutions. The effect of hydrophobization on the adsorption of anionic surfactants such as sodium dodecyl sulfate (SDS) and dioctyl sodium sulfosuccinate (AOT) is investigated.

Effect of hydrophobization of gold QCM-D crystals on surfactant adsorption at the solid-liquid interface

239th National Meeting (2010)

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