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User: cmacdonald

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  1. Re:I thought the reasons whre obvious? on We Finally Know Why Oil and Water Don't Mix · · Score: 3, Informative

    Right, but try and use those sentences to predict and calculate the magnitude of those forces. How is that going? The reason this seems to be significant is it allows us to model these forces beyond the the explanation of "the oil sticks together". Van der waals forces don't apply accurately here so we don't have a good tool to calculate these things. From the actual publication: "A quantitative and general model is derived for the interaction potential of charged bilayers that includes the electrostatic double-layer force of the Derjaguin-Landau-Verwey-Overbeek theory, attractive hydrophobic interactions, and repulsive steric-hydration forces. The model quantitatively accounts for the elastic strains, deformations, long-range forces, energy maxima, adhesion minima, as well as the instability (when it exists) as two bilayers breakthrough and (hemi)fuse. These results have several important implications, including quantitative and qualitative understanding of the hydrophobic interaction, which is furthermore shown to be a nonadditive interaction." While I wouldn't want to imply it's on the following scale, it's along the lines of the difference between "gravity pulls us down towards the earth" and Newton's Law of Universal Gravitation. Long time listener, first time poster. I apologize for not being able to make new lines somehow.