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Ice/Water Interface: Zeta Potential, Point of Zero Charge, and Hydrophobicity by Jan Drzymala; Zygmunt Sadowski; Lucyna Holysz; Emil Chibowski is a Chemistry article available to read on EtoBox.

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The ice/water interface is a common and important part of many biological, environmental, and technological systems. In contrast to its importance, the system has not been extensively studied and is not well understood. Therefore, in this paper the properties of the H(2)O ice/water and D(2)O ice/water interfaces were investigated. Although the zeta potential vs pH data points were significantly scattered, it was determined that the isoelectric point (iep) of D(2)O ice particles in water at 3.5 degrees C containing 10(-3) M NaCl occurs at about pH 3.0. The negative values of the zeta potential, calculated from the electrophoretic mobility, seem to decrease with decreasing content of NaCl, while the iep shifts to a higher pH. The point of zero charge (pzc) of D(2)O ice and H(2)O ice, determined by changes in pH of 10(-4) M NaCl aqueous solution at 0.5 degrees C after the ice particle addition, was found to be very different from the iep and equal to pH 7.0 +/- 0.5. The shift of the iep with NaCl concentration and the difference in the positions of the iep and pzc on the pH scale point to complex specific adsorption of ions at the interface. Interestingly, similar values of iep and pz

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Author

Jan Drzymala; Zygmunt Sadowski; Lucyna Holysz; Emil Chibowski

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

1999

Language

EN

Field

Chemistry (Physical Sciences)