Chemical Potential of Water from Measurements of Optic Axial Angle of Zeolites

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Science  06 Dec 1968:
Vol. 162, Issue 3858, pp. 1145-1146
DOI: 10.1126/science.162.3858.1145


Values of the uncorrected optic axial angle (2Hα) of a crystal of the calcium zeolite stellerite (CaAl2Si7Ol8 · 7H20) immersed in calcium chloride solutions of known activity of water (aw) are directly proportional to log aw. A general relationship between the chemical potential of water in the crystal and the optic axial angle is obeyed.

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