Dispersion of ultrafine alumina in modifier solution —the role of polar interfacial interaction

Abstract

Dispersion of ultrafine alumina suspension is examined by using particle size analyzer. The zeta potential and contact angle measurements were used to discuss the electrokinetic behavior and surface wettability of alumina in modifier solution, and to calculate the electrostatic interfacial intheraction forces between alumina particles. The aggregation of ultrafine alumina occurs near its PZC. Addition of modifier increases the zeta potential of alumina and its surface hydrophilicity, resulting in increase of electrostatic and hydration repulsion. It makes the suspension of ultrafine alumina completely dispersed. The average particle size of the suspension is decreased from 1.73 µm in absence of modifier to 0.8 µm in the presence of tripolyphosphate. According to polar interfacial interaction approach, the hydration forces responsible for the stability of alumina suspension in the presence of modifier have also been obtained. The extended DLVO theory is successful to describe the dispersion behavior of ultrafine alumina in modifier solution.

Keywords

dispersion / alumina / modifier / polar interfacial interaction / extended DLVO theory

References

[1] CUI Ji-rang, FANG Qi-xue, HUANG Guo-zhi. Crystal structures and surface properties of diaspore and kaolinite[J]. Nonferrous Metal, 1999, (2): 25–30.

[2] SteigermaldJ D, MurarkaS P, GutmannR JChemical mechanical planarization of micro-electronic materials[M], 1996, New York, John & Sons Inc: 324-324

[3] YotsumotoH, YoonR H. Application of extended DLVO theory: I. Stability of silica[J]. J Coll Inter Sci, 1993, 157: 434-441

[4] YotsumotoH, YoonR H. Application of extended DLVO theory: I. Stability of rutile suspensions[J]. J Coll Inter Sci, 1993, 157: 426-433

[5] Cevc G. Lipid hydration. In: Water and biological macromolecules[M]. Westhof E ed. The Macmillan Press Ltd, 1993. 338–376.

[6] ThielP A, MadeyT E. The interaction of water with solid surfaces: fundamental aspects[J]. Surf Sci Rep, 1987, 7: 211-385

[7] DelvilleA. Structure and properties of confined liquids: A molecular model of the clay-water interface[J]. J Phys Chem, 1993, 97: 9703-12

[8] HuYue-hua, WangDian-zuo. Particle interaction: the theory of extended DLVO and is applications in flotation[J]. J CSIMM, 1994, 25(3): 310-314(in Chinese)

[9] DerjaguinB V. A theory of the heterocoagulation interaction and adhesion of dissimilar particles in solutions of electrolytes[J]. Discuss Farady Soc, 1954, 18: 85-98

[10] IsraelchviliJ N, McGuigganP M. Forces between surfaces in liquids[J]. Science, 1988, 241: 795-800

[11] Israelachvili J N. Intermolecular and surface forces (2nd ed)[M]. Academic Press, Harcourt Brace & Company Publishers, 1991. 450.

[12] IslamA M, ChowdhryB Z, SnowdenM J. Heteroaggregation in colloidal dispersions[J]. Adv Coll Inter Sci, 1995, 62: 109-136

[13] XuZ, WilliamD, IsraelachviliJ. Forces between crystalline alumina (sapphire) surfaces in aqueous sodium dodecyl sulfate surfactant solutions[J]. Langmuir, 1996, 12: 2263-2270

[14] van OssC J, ChaudhuryM K, GoodR J. Interfacial Lifshitz-van der Waals and polar interactions in macroscopic systems[J]. Chem Rev, 1988, 88: 927-941

[15] RabinovichY I, DerjaguinB V, ChuraevN V. Direct measurements of long range surface forces in gas and liquid media[J]. Adv Coll Interface Sci, 1982, 16: 63-78

[16] PashleyR M. Hydration forces between mica surfaces in electrolyte solutions[J]. Adv Coll Interface Sci, 1982, 16: 57-62

[17] SchibyD, RuckensteinE. The role of the polarization layers in hydration forces[J]. Chem Phy Lett, 1983, 95(4/5): 435-438

[18] PashleyR M, IsraelachviliJ N. Molecular layering of water in thin films between mica surfaces and its relation to hydration forces[J]. J Coll Inter Sci, 1984, 101(2): 511-523

[19] SpitzerJ J. Theory of dissociative electrical double layers: the limit of close separations and “hydration” forces[J]. Langmuir, 1992, 8: 1659-1662

[20] ChuraevN V, DerjaguinB V. Inclusion of structural forces in the theory of stability of colloids and films[J]. J Coll Inter Sci, 1985, 103(2): 542-553

[21] IsraelachviliJ N. Forces between surfaces in liquids[J]. Adv Coll Inter Sci, 1982, 16: 31-47

[22] HuYue-hua, QuGuan-zhou, WangDian-zuo. Theory and application of interfacial polar interaction in flotation of fine particles[J]. J CSIMM, 1993, 24(6): 749-754(in Chinese)

[23] CevcG, HauserM, KornyshevA A. Effects of the interfacial structure on the hydration forces between laterally uniform surfaces[J]. Langmuir, 1995, 11(8): 3103-3110

[24] CevcG, HauserM, KornyshevA A. Effects of the interfacial structure on the hydration force between laterally nonuniform surfaces[J]. Langmuir, 1995, 11(8): 3111-3118

[25] van OssC J, GoodR J. On the mechanism of “hydrophobic” interaction[J]. J Dispersion Sci Tech, 1988, 9: 355-362

[26] van OssC J, GieseR F, CostanzoP M. DLVO and non-DLVO interactions in hectorite[J]. Clays Clay Miner, 1990, 38: 151-160

[27] VeeramasuneiS, HuYue-hua, YalamanchiliM R, et al.. Interaction forces at high ionic strengths: The role of polar interfacial interactions[J]. J Coll Inter Sci, 1997, 188: 473-480

[28] van OssC J, ChaudhuryM K, GoodR J. Monopolar surfaces[J]. Adv Coll Inter Sci, 1987, 28: 35-64

[29] van OssC J, GoodR J. Surface tension and the solubility of polymers and biopolymers: The role of polar and apolar interfacial free energies[J]. J Macromol Sci Chem, 1989, A26: 1183-1203