Effect of Surface Hydrophobicity on the Hydrodynamic Detachment of Particles from Surfaces

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• 作者：Alexandre M. Freitas and Mukul M. Sharma
• 刊名：Langmuir
• 出版年：1999
• 出版时间：March 30, 1999
• 年：1999
• 卷：15
• 期：7
• 页码：2466 - 2476
• 全文大小：257K
• 年卷期：v.15,no.7(March 30, 1999)
• ISSN：1520-5827

文摘

Experiments were performed to evaluate the hydrodynamic force required to detach colloidal particlesfrom substrates by fluids in simple shear flow. The role of DLVO and acid-base interactions on the processof adhesion and removal of colloidal particles, from model surfaces, in various fluid environments wasinvestigated. Particles and substrates with varying degrees of hydrophobicity were used. The free energyof interaction between these surfaces in a number of fluid media was calculated using the acid-baseapproach. Good qualitative agreement was obtained between calculated values of free energy of interactionusing the acid-base approach and the critical hydrodynamic force required to detach the particles if longrange electrostatic repulsion is properly accounted for. Results for a range of particles and substrates ofvarying hydrophobicity and for a range of solvents can be consistently explained using this approach.