Publication Date:
2013-06-07
Description:
The physical stability of emulsions can be related to changes in the droplet size distribution over time. Stability control of emulsions used as metal working fluids is an important factor for the machining industry due to the decreased performance of aged and broken emulsions. Results of turbidimetric spectra measurements of metal working fluids for process control purposes and emulsion stability monitoring are discussed. Metal working emulsions were artificially destabilized by admixing salts which resulted in droplet coagulation. The destabilization process was investigated by measuring the droplet size distribution and the turbidity spectra over time. The results were evaluated based on quantitative criteria proposed in the literature. The applicability of these criteria to evaluate metal working fluids during machining operations is discussed. The destabilization process of a commercial metal working fluid (MWF) emulsion artificially aged with CaCl 2 was characterized by UV-Vis-NIR spectroscopy. The wavelength exponent proved as a quantitative criterion in monitoring of the emulsion destabilization. This simple method can be applied to in situ characterization of MWF quality in machining processes.
Print ISSN:
0930-7516
Electronic ISSN:
1521-4125
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
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