Ultrasound for Characterizing Colloids Particle Sizing, Zeta Potential Rheology
作者： Philip J. Goetz , Andrei S. Dukhin
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摘要: Selected Papers: Introduction Historical overview Advantages of ultrasound over traditional characterization techniques. Fundamentals Interface and Colloid Science: Real model dispersions Parameters the dispersion medium dispersed phase interfacial layer Interactions in colloid interface science Traditional particle sizing. Acoustics Liquids: Longitudinal waves wave equation its relation to rheology Acoustic impedance Propagation through boundaries - reflection porous media Chemical composition influence. Theory for Particulates: Extinction=absorption + scattering Superposition approach theory a dilute system Ultrasound absorption concentrates Input parameters. Electroacoustic Theory: The Ion Vibration Potential (IVP) low frequency electroacoustic limit Smoluchowski (SDEL) O'Brien vibration current concentrated systems Qualitative analysis. Experimental Verification Theories: Viscous losses Thermal Structural Scattering phenomena Measurement Techniques perspective Difference between measurement analysis attenuation sound speed using interferometry transmission technique Precision, accuracy, dynamic range measurements Analysis yield desired outputs properties Zeta potential calculation from CVI acoustic impedance. Applications Characterizing Particulate Systems: Characterization aggregation flocculation Stability emulsions microemulsions Particle sizing mixed colloids with several phases Chemical-mechanical polishing Large resolution Titration electroacoustics Colloids high ionic strength background Effect air bubbles Table applications.
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