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The Detection of Salting‐out. A Comparative Study
Author(s) -
Martin J.,
Alcantara R.,
GarciaRuiz J. M.
Publication year - 1991
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170260108
Subject(s) - supersaturation , nucleation , metastability , noise (video) , intensity (physics) , conductivity , beam (structure) , supercooling , crystal (programming language) , laser beams , optics , laser , detector , materials science , chemistry , analytical chemistry (journal) , thermodynamics , physics , computer science , chromatography , artificial intelligence , image (mathematics) , programming language , organic chemistry
We present a new device for the measurement of the metastable zone width and related parameters. The salting‐out is detected by using simultaneously seven different methods: a) visual detection, b) intensity of the transmitted laser beam, c) noise associated to (b), d) intensity of the reflected laser beam, e) noise associated to (d), f) conductivity, and g) pH. Full computerization permits an easy and quick take of data on the evolution of the nucleation and crystal growth processes. The use of this apparatus shows that the waiting time for the growth component of the induction time is minimized for the method using the noise associated to the reflected light as the recorded parameter. This comparative study shows that the maximum undercooling and maximum allowable supersaturation values obtained by the different tested methods present significant differences between each other. Meanwhile, we propose that the tabulated values of such parameters should specify the experimental way followed for the obtainment of reliable data.