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We note here that the work to create the interface contains positive, quadratic terms in the colloid size, but these can be offset, at least in principle, by a negative contribution linear in the particle size, which contains the line tension. That may lead to a net negative free energy of creating the interface, which could occur for the small particles studied here, as the (positive) quadratic terms always dominate for a large colloid size. This line tension argument could explain why we never observed stable emulsions for colloids with a much larger radius than the nanoparticles in this study.
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