Zeta potential of Teflon in presence of monovalent and divalent ions

• Autorzy: Gulgonul Ilhan

Identyfikatory

DOI

10.5277/ppmp19014

• Języki publikacji: EN

Abstrakty

EN

In this study, the specific effects of Na+ and Ca2+ ions on natural hydrophobic Teflon particles and flat Teflon surfaces were investigated using zeta potential and contact angle measurements, respectively. The zeta potential measurements showed that the surface charge of Teflon was negative at all pH values in the absence of salt ions, and became the positive with the increased salt concentration, and obtained an iso electric point (iep) between pH 3 and 4. The results also indicated that Ca+2 ions more adsorbed on the Teflon surface compared to Na+ ions in the case of the compression of the electrical double layer. The contact angle measurements with Teflon sample showed that while the flat Teflon had a contact angle of 107° at pure water, and the contact angle considerably reduced as a function of salt concentration. This decrease was more effective in the presence of Ca2+ ions rather than Na+ ions. While calcium is a strong water structure maker cation, sodium is a weak structure maker cation, but the role of calcium is more effective at the Teflon-water interface according to zeta potential and contact angle measurements. It is revealed that the Ca+2 ions have a specific effect on Teflon surface due to low salt concentrations and ion charges. The different effects of these cations on Teflon-water interface can be attributed to use in mineral processing, especially in flotation enrichment.

Słowa kluczowe

EN

polytetrafluoroethylene; PTFE surface; natural hydrophobic; zeta potential; contact angle

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2019
• Tom: Vol. 55, iss. 3
• Strony: 792--801
• Opis fizyczny: Bibliogr. 39 poz.

Twórcy

autor

Gulgonul Ilhan

• Balikesir University, Mining Department Cagis, Balikesir 10001 TURKEY

Bibliografia

• ADAMCZYK, Z., ZAUCHA, M., ZEMBALA, M., 2010. Zeta potential of mica covered by colloid particles: A streaming potential study, Langmuir. 26 (12), 9368–9377.
• BEATTIE, J.K., 2006. The intrinsic charge on hydrophobic microfluidic substrates, Lab Chip, 6, 1409–1411.
• CHAUDHURI, R.G., PARIA, S., 2009. Dynamic contact angles on PTFE surface by aqueous surfactant solution in the absence and presence of electrolytes, Journal of Colloid and Interface Science. 337 (2), 555-562.
• DRELICH, J.W., MILLER, J.D., GOOD, R.J., 1996. The effect of drop (bubble) size on advancing and receding contact angles for heterogeneous and rough solid surfaces as observed with sessile-drop and captive-bubble techniques, Journal Colloid Interface Science. 179, 37–50.
• EBNESAJJAD, S., 2014. Fluoroplastics, volume 1: Non-melt processible fluoropolymers - the definitive user's guide and data book, fabrication and processing of polytetrafluoroethylene dispersions, Chadds Ford, Pennsylvania, USA.
• EBNESAJJAD, S., 2016. Expanded PTFE applications handbook: Technology, manufacturing and applications, Chadds Ford, Pennsylvania, USA.
• ECKMANN, D.M., CAVANAGH, D.P., BRANGER, A.B., 2001. Wetting characteristics of aqueous surfactant-laden drops, Journal Colloid and Interface Science. 242 (2), 386-394.
• EHRE, D., LAVERT, E., LAHAV, M., LUBOMIRSKY, I., 2010. Water freezes differently on positively and negatively charged surfaces of pyroelectric materials, Science. 327 (5966), 672–675.
• GOSS, B., 2010. Practical guide to adhesive bonding of small engineering plastic and rubber parts, ch.6, iSmithers Rapra Publishing, UK.
• GRAY-WEALE, A., 2009. Comment on ‘Behaviour of hydroxide at the water/vapor interface’ [Chem. Phys. Lett. 474 (2009) 241], Chemical Physics Letters. 481, 22–24.
• HANCER, M., CELİK, M.S., MILLER, J.D., 2001. The significance of interfacial water structure in soluble salt flotation systems, Journal of Colloid and Interface Science, 235, 150–161.
• ISRAELACHVILI, J. N., 1992. Intermolecular and surface forces, Academic Press, London, England.
• JANCZUK, B., CHIBOWSKI, E., WOJCIK, W., 1985. The influence of n-alcohols on the wettability of hydrophobic solids, Powder Technology. 45, 1-6.
• KINLOCH, A.J., 1987. Adhesion and adhesives: Science and technology, Chapman and Hall, Book Review, London.
• KIRBY, B.J., HASSELBRINK Jr, E.F., 2004. Zeta potential of microfluidic substrates: 2. Data for polymers, Electrophoresis. 25, 203-213.
• KOSIOR, D., ZAWALA, J., KRASOWSKA, M., MALYSA, K., 2013. Influence of n-octanol and-terpineol on thin film stability and bubble attachment to hydrophobic surface, Physical Chemistry Chemical Physics. 15, 2586–2595.
• KOWALCZUK, B.P., ZAWALA, J., 2016. A relationship between time of three-phase contact formation and flotation kinetics of naturally hydrophobic solids, Colloids and Surfaces A: Physicochem. Eng. Aspects, 506, 371–377.
• KOWALCZUK, P.B., DRZYMALA, J., 2011. Contact angle of bubble with an immersed-in-water particle of different materials, Industrial Engineering Chemistry Research. 50 (7), 4207–4211.
• KOWALCZUK, P.B., ZAWALA, J., KOSIOR, D., DRZYMALA, J., MALYSA, K., 2016. Three-phase contact formation and flotation of highly hydrophobic polytetrafluoroethylene in the presence of increased dose of frothers, Industrial Engineering Chemistry Research. 55 (3), 839–843.
• KUDIN, K.N., CAR, R., 2008. Why are water–hydrophobic interfaces charged?, Journal of American Chemical Society. 130 (12), 3915–3919.
• LUTZENKIRCHEN, J., PREOCANIN, T., KALLAY, N., 2008. A macroscopic water structure based model for describing charging phenomena at inert hydrophobic surfaces in aqueous electrolyte solutions, Physical Chemistry Chemical Physics. 10, 4946–4955.
• LYKLEMA, J., 1991. Fundamentals of interface and colloid science, volume 1-Fundamentals, Academic Press, London, England.
• MARCUS, Y., 1994. Viscosity B-Coefficients, structural entropies and heat capacities, and the effects of ions on the structure of water, Journal of Solution Chemistry, 23 (7), 831–848.
• MARINOVA, K.G., ALARGOVA, R.G., DENKOV, N. D., VELEV, O.D., PETSEV, D.N., IVANOV, I.B., BORWANKAR, R.P., 1996. Charging of oil-water interfaces due to spontaneous adsorption of hydroxyl ions, Langmuir. 12, 2045-2051.
• MORGA, M., ADAMCZYK, Z., KOSIOR, D., 2016. Silica monolayer formation and stability determined by in situ streaming potential measurements, Electrochimica Acta. 206, 409–418.
• MORTON III, S.A., KEFFER, D.J., DAVIS, A.N., COUNCE, R.M., (2008). Effect of low concentration salt on organic contact angle in ionic surfactant solutions: Insight from theory and experiment, Separation Science and Technology. 43, 310-330.
• OZDEMIR, O., CELİK, M.S., NICKOLOV, Z.S., MILLER, J.D., 2007. Water structure and its influence on the flotation of carbonate and bicarbonate salts, Journal of Colloid and Interface Science, 314, 545–551
• PREOCANIN, T., SELMANI, A., LINDQVIST-REIS, P., HEBERLING, F., KALLAY, N., LÜTZENKIRCHEN, J., 2012. Surface charge at Teflon/aqueous solution of potassium chloride interfaces, Colloids and Surfaces A: Physicochem. Eng. Aspects. 412, 120– 128.
• SOSTER, R., STANA-KLEINSCHEK, K., BRUMEN, M., RIBITSCH, V., 2005. Measurements of zeta potential of poly (tetrafluoroethylene) foils, Materials Science Forum Vols. 480-481, 89-94.
• SPAGNOLO, D.A., MAHAM, Y., CHUANG, K.T., 1996. Calculation of contact angle for hydrophobic powders using heat of immersion data, Journal of Physical Chemistry. 100, 6626-6630
• TANDON, V., BHAGAVATULA, S.K., NELSON, W.C., KIRBY, B.J., 2008. Zeta potential and electroosmotic mobility in microfluidic devices fabricated from hydrophobic polymers: 1. the origins of charge, Electrophoresis. 29 (5), 1092–1101.
• WELZEL, P.B., RAUWOLF, C., YUDIN, O., GRUNDKE, K., 2002. Influence of aqueous electrolytes on the wetting behavior of hydrophobic solid polymers—low-rate dynamic liquid/fluid contact angle measurements using axisymmetric drop shape analysis, Journal of Colloid and Interface Science. 251, 101-108.
• WINTER, B., FAUBEL, M., VACHA, R., JUNGWIRTH, P., 2009a. FRONTIERS ARTICLE Behavior of hydroxide at the water/vapor interface, Chemical Physics Letters. 474, 241-247.
• WINTER, B., FAUBEL, M., VACHA, R., JUNGWIRTH, P., 2009b. Reply to comments on Frontiers Article ‘Behavior of hydroxide at the water/vapor interface’, Chemical Physics Letters. 481, 19–21.
• ZDZIENNICKA, A., JANCZUK, B., WOJCIK, W., 2003. Wettability of polytetrafluoroethylene by aqueous solutions of two anionic surfactant mixtures, Journal Colloid and Interface Science 268 (1), 200-207.
• ZEMBALA, M., 2004. Electrokinetics of heterogeneous interfaces, Adv. Colloid Interface Science. 112, 59–92.
• ZEMBALA, M., ADAMCZYK, Z., 2000. Measurements of streaming potential for mica covered by colloid particles, Langmuir. 16 (4), 1593–1601.
• ZIMMERMANN, R., DUKHIN, S., WERNER, C., 2001. Electrokinetic measurements reveal interfacial charge at polymer films caused by simple electrolyte ions, Journal of Physical Chemistry B. 105 (36), 8544–8549.
• ZIMMERMANN, R., REIN, N., WERNER, C., 2009. Water ion adsorption dominates charging at nonpolar polymer surfaces in multivalent electrolytes, Physical Chemistry Chemical Physics. 11, 4360–4364