Add time:09/07/2019         Source:sciencedirect.com

This paper is part of our study of the frother structure-property relationship using bubble rise velocity as the property. Single bubble rise velocity profiles were determined for surfactants of the polyethylene glycol (PEG) family in a 350-cm column, and the concentration to reach minimum velocity (CMV) measured at 300 cm is determined. The lower the CMV indicates a structure more effective in slowing bubble rise. The CMV is shown to decrease as both alkyl chain length (n, number of carbons) and number of ethylene oxide groups (l) increases. Linear correlations log CMV vs. n and l were observed; and taking literature data for critical coalescence concentration (CCC), a linear log CMV vs. log CCC correlation was found. Mechanisms controlling bubble rise velocity based on structure effects on surface tension gradients and surface viscosity are discussed. A comparison with previous findings on polypropylene glycols is included.

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