Poly (N-isopropylacrylamide) (PNIPAM) as a flotation collector: Effect of temperature and molecular weight |
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| Authors: | Elizaveta Burdukova Haihong Li Dee J Bradshaw George V Franks |
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| Affiliation: | 1. RWTH Aachen University, Institute of Physical Chemistry, Landoltweg 2, 52074 Aachen, Germany;2. RWTH Aachen University, Institute of Technical Thermodynamics, Schinkelstrasse 8, 52064 Aachen, Germany;1. Faculty of Chemistry, Taras Shevchenko National University of Kyiv, 60 Volodymyrs''ka str., 01601 Kyiv, Ukraine;2. Faculty of Physics, Taras Shevchenko National University of Kyiv, 60 Volodymyrs''ka str., 01601 Kyiv, Ukraine;3. Institut Charles Sadron (CNRS-UdS), 23 Loess str., Strasbourg 67034, France;4. Problem Research Laboratory, National University of Food Technology, Volodymyrska str. 68, 01601 Kyiv, Ukraine |
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| Abstract: | Poly (N-isopropylacrylamide) (PNIPAM), a temperature responsive polymer, was tested for its potential use as a collector in a quartz flotation system. The effect of PNIPAM on the surface characteristics of quartz particles were studied using induction time, contact angle and zeta potential measurement and analysed in terms of the probability of bubble/particle attachment and the probability of formation of stable bubble/particle aggregates. It was found that probability of bubble/particle attachment of quartz significantly increases in the presence of PNIPAM, particularly at temperatures above the lower critical solution temperature (LCST) of 32 °C. Furthermore, the probability of bubble/particle attachment increases with increasing PNIPAM molecular weight. This was attributed to the increased hydrophobicity of the quartz surface as well as the decrease in the double layer repulsion between bubbles and particles. This leads to the conclusion that PNIPAM could act as an effective collector in a flotation system. |
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