Journal
PHYSICAL REVIEW LETTERS
Volume 130, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.130.118001
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This study provides the first direct estimation of the interfacial free energy of NaCl-saturated solution on several crystallographic planes. The results show high anisotropy between different crystal orientations, with values ranging from 100 to 150 mJ m-2.
Salty water is the most abundant electrolyte aqueous mixture on Earth, however, very little is known about the NaCl-saturated solution interfacial free energy (gamma s). Here, we provide the first direct estimation of gamma s for several NaCl crystallographic planes by means of the mold integration technique, a highly efficient computational method to evaluate interfacial free energies with anisotropic crystal resolution. Making use of the JC-SPC/E model, one of the most benchmarked force fields for NaCl water solutions, we measure gamma s of four different crystal planes, (100), (110), (111), and (112 over bar ) with the saturated solution at normal conditions. We find high anisotropy between the different crystal orientations with values ranging from 100 to 150 mJ m-2, and the average value of the distinct planes being gamma over bar s = 137(20) mJ m-2. This value for the coexistence interfacial free energy is in reasonable agreement with previous extrapolations from nucleation studies. Our Letter represents a milestone in the computational calculation of interfacial free energies between ionic crystals and aqueous solutions.
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