Impact of Aqueous Electrolytes on Interfacial Energy

Abstract The effects of aqueous electrolytes on particle–particle interactions in aqueous media are not completely understood. Electrolytes are typically considered to impact only electrostatic energy. In this work, the impact of aqueous electrolytes on van der Waals and Lewis acid/base potential energies was quantified using both hydrophobic and hydrophilic substrates. Increases in ionic strength beyond 0.001 M resulted in comparable increases in solid–water interfacial energy in polytetrafluoroethylene (PTFE) and organically coated sodium montmorillonite systems. The change in water/PTFE interfacial energy, as determined by contact angle measurements, was greater than that predicted by screening of the nondispersion component of the Hamaker constant using the Mahanty and Ninham model. Increases in interfacial energy, as a function of salt concentration, were greater with increasing substrate hydrophilicity. Although the systems studied in this work were disparate in nature, they all appeared to exhibit similar trends in interfacial surface energy as a function of ionic strength. Similarity in the results may suggest that aqueous electrolytes may modify the solvent structure within the interfacial region.

[1]  F. Lange,et al.  Effect of Counterion Size on Short Range Repulsive Forces at High Ionic Strengths , 1997 .

[2]  B. Ninham,et al.  Hydrophobicity, specific ion adsorption and reactivity , 1997 .

[3]  Yue-hua Hu,et al.  Interaction forces at high ionic strengths: The role of polar interfacial interactions , 1997 .

[4]  B. Ninham,et al.  Ion Binding and Ion Specificity: The Hofmeister Effect and Onsager and Lifshitz Theories , 1997 .

[5]  R. Pugh,et al.  Surface Tension of Aqueous Solutions of Electrolytes: Relationship with Ion Hydration, Oxygen Solubility, and Bubble Coalescence , 1996, Journal of colloid and interface science.

[6]  Bowen,et al.  The Osmotic Pressure of Electrostatically Stabilized Colloidal Dispersions , 1996, Journal of colloid and interface science.

[7]  J. Ralston,et al.  Surface Forces between Spherical ZnS Particles in Aqueous Electrolyte , 1996 .

[8]  B. Ninham,et al.  Adsorption Forces between Hydrophobic Monolayers , 1996 .

[9]  Håkan Wennerström,et al.  Role of hydration and water structure in biological and colloidal interactions , 1996, Nature.

[10]  A. Soper,et al.  Effect of high salt concentrations on water structure , 1995, Nature.

[11]  N. Churaev.  Contact angles and surface forces , 1995 .

[12]  R. Stairs.  Calculation of surface tension of salt solutions: effective polarizability of solvated ions , 1995 .

[13]  W. Richard Bowen,et al.  The calculation of dispersion forces for engineering applications , 1995 .

[14]  S. Swanton.  Modelling colloid transport in groundwater; the prediction of colloid stability and retention behaviour , 1995 .

[15]  C. J. Oss,et al.  Linkage between ζ-potential and electron donicity of charged polar surfaces 1. Implications for the mechanism of flocculation of particle suspensions with plurivalent counterions , 1994 .

[16]  C. J. Oss,et al.  Linkage between ζ-potential and electron donicity of charged polar surfaces 2. Repeptization of flocculation caused by plurivalent counterions by means of complexing agents , 1994 .

[17]  Jacob N. Israelachvili,et al.  Measurements of Hydrophobic and DLVO Forces in Bubble-Surface Interactions in Aqueous Solutions , 1994 .

[18]  Y. Shen,et al.  Surface Vibrational Spectroscopic Studies of Hydrogen Bonding and Hydrophobicity , 1994, Science.

[19]  C. V. Oss,et al.  Interfacial Forces in Aqueous Media , 1994 .

[20]  D. Grasso,et al.  Surface thermodynamics of ozone-induced particle destabilization , 1994 .

[21]  Herman J. C. Berendsen,et al.  Molecular dynamics simulation of a membrane/water interface: the ordering of water and its relation to the hydration force , 1993 .

[22]  Barry W. Ninham,et al.  The effect of electrolytes on bubble coalescence in water , 1993 .

[23]  R. Yoon,et al.  Application of Extended DLVO Theory: II. Stability of Silica Suspensions , 1993 .

[24]  T. Kunitake,et al.  Submicron-range attraction between hydrophobic surfaces of monolayer-modified mica in water , 1992 .

[25]  John L. Parker,et al.  Hydrophobic attraction: a reexamination of electrolyte effects , 1992 .

[26]  L. Meagher.  Direct measurement of forces between silica surfaces in aqueous CaCl2 solutions using an atomic force microscope , 1992 .

[27]  Richard M. Pashley,et al.  Direct measurement of colloidal forces using an atomic force microscope , 1991, Nature.

[28]  W. Duncan-Hewitt.  Oriented dipoles at interfaces : calculation of surface potential and surface tension , 1991 .

[29]  M. Chaudhury,et al.  Interfacial Lifshitz-van der Waals and polar interactions in macroscopic systems , 1988 .

[30]  B. Deryagin,et al.  Structure of water in thin layers , 1987 .

[31]  M. Belaya,et al.  Structural forces as a result of nonlocal water polarizability , 1987 .

[32]  G. Whitesides,et al.  Acid-Base Behavior of Carboxylic Acid Groups Covalently Attached at the Surface of Polyethylene, , 1985 .

[33]  P. Mctigue,et al.  Charge distribution at the gas-water interface the surface potential of water , 1985 .

[34]  B. Derjaguin,et al.  Inclusion of structural forces in the theory of stability of colloids and films , 1985 .

[35]  G. A. Parks.  Surface and interfacial free energies of quartz , 1984 .

[36]  J. Quirk,et al.  The effect of cation valency on DLVO and hydration forces between macroscopic sheets of muscovite mica in relation to clay swelling , 1984 .

[37]  Richard M. Pashley,et al.  DLVO and hydration forces between mica surfaces in Li+, Na+, K+, and Cs+ electrolyte solutions: A correlation of double-layer and hydration forces with surface cation exchange properties , 1981 .

[38]  Richard M. Pashley,et al.  Hydration forces between mica surfaces in aqueous electrolyte solutions , 1981 .

[39]  F. Fowkes,et al.  Contact angles and the equilibrium spreading pressures of liquids on hydrophobic solids , 1980 .

[40]  H. Sasaki,et al.  Zeta potential measurements of bubbles in aqueous surfactant solutions , 1978 .

[41]  S. Hård,et al.  The surface tension of concentrated aqueous solutions of 1.1-electrolytes measured by means of Wilhelmy and laser light scattering methods , 1977 .

[42]  Peter A. Kollman,et al.  A general analysis of noncovalent intermolecular interactions , 1977 .

[43]  R. Good.  Surface free energy of solids and liquids: Thermodynamics, molecular forces, and structure , 1977 .

[44]  B. Derjaguin,et al.  Structural component of disjoining pressure , 1974 .

[45]  L. L. Ciaccio,et al.  Water and Water Pollution Handbook , 1971 .

[46]  W. Drost-Hansen.  AQUEOUS INTERFACES—METHODS OF STUDY AND STRUCTURAL PROPERTIES. PART TWO , 1965 .

[47]  L. Girifalco,et al.  A Theory for the Estimation of Surface and Interfacial Energies. I. Derivation and Application to Interfacial Tension , 1957 .

[48]  E. Verwey,et al.  Theory of the stability of lyophobic colloids. , 1955, The Journal of physical and colloid chemistry.

[49]  Irving Langmuir,et al.  The Role of Attractive and Repulsive Forces in the Formation of Tactoids, Thixotropic Gels, Protein Crystals and Coacervates , 1938 .

[50]  H. C. Hamaker.  The London—van der Waals attraction between spherical particles , 1937 .

[51]  Lars Onsager,et al.  The Surface Tension of Debye‐Hückel Electrolytes , 1934 .

[52]  M. Butkus.  Impact of phosphate on the surficial properties of a ferric hydroxide matrix: Linkage between surface complexation and colloid stability , 1997 .

[53]  D. Saville,et al.  Electrophoresis of drops and bubbles , 1991 .

[54]  G. Cevc.  Hydration force and the interfacial structure of the polar surface , 1991 .

[55]  J. Marra.  Direct measurements of attractive Van der Waals and adhesion forces between uncharged lipid bilayers in aqueous solutions , 1986 .

[56]  P. Claesson,et al.  An ESCA and AES study of ion-exchange on the basal plane of mica , 1986 .

[57]  J. Israelachvili.  Intermolecular and surface forces , 1985 .

[58]  A. L. Horvath,et al.  Handbook of aqueous electrolyte solutions : physical properties, estimation, and correlation methods , 1985 .

[59]  S. Marčelja,et al.  Spatially varying polarization in water. A model for the electric double layer and the hydration force , 1983 .

[60]  A. Dupré.  Théorie mécanique de la chaleur , 1969 .

[61]  D. H. Bangham,et al.  Adsorption and the wettability of solid surfaces , 1937 .