In fact, complete hydrophobization of the nanoparticles is not a requirement to trap the nanoparticles at the interface. As Moon et al. showed, nanoparticles can be trapped at the interface by reducing the compatibility of the colloidal dispersion phase to water, increasing the particle concentration in the colloid, reducing the zeta potential of the colloidal particles, adding a salt (NaCl) in the suspension, and utilizing soft particles. Morag et al. showed another interesting possibility by adding elaidic acid and myristyl alcohol to thiol-coated Au nanoparticles to obtain network-like Au nanoparticle films with polygonal myristyl alcohol domains, Figure (e). Elaidic acid, on the other hand, is added for solubilizing Au NPs at the air/water inter-face at the operating temperature.