Chemical Engineering

Download Characterization of Liquids, Nano- and Microparticulates, by Andrei S. Dukhin PDF

By Andrei S. Dukhin

Keywords outline the scope of this booklet: 'ultrasound' and 'colloids'. traditionally, there was little actual communique among practitioners in those fields. even supposing there's a huge physique of literature dedicated to ultrasound phenomenon in colloids, there's little attractiveness that such phenomena should be of genuine value for either the advance and purposes of colloid science. On the opposite facet, colloid scientists haven't embraced acoustics as a tremendous software for characterizing colloids. the shortcoming of any critical discussion among those medical fields is the most important motivation in the back of this book.- Covers in detail this multidisciplinary field combining acoustics, electroacoustics, colloid technology, analytical chemistry and rheology - presents a bibliography with greater than 1,000 references - provides theories and their experimental verification, in addition as analysis of the equipment and relating functions akin to prescription drugs, ceramics, and polymers 

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Characterization of Liquids, Nano- and Microparticulates, and Porous Bodies Using Ultrasound

Keyword phrases outline the scope of this ebook: 'ultrasound' and 'colloids'. traditionally, there was little actual verbal exchange among practitioners in those fields. even supposing there's a huge physique of literature dedicated to ultrasound phenomenon in colloids, there's little acceptance that such phenomena should be of actual value for either the improvement and functions of colloid technology.

Extra resources for Characterization of Liquids, Nano- and Microparticulates, and Porous Bodies Using Ultrasound

Sample text

REAL AND MODEL SYSTEMS Real heterogeneous systems, by their very nature, are quite complex. Two of these complexities are the variation of the particle size and shape within a particular dispersion. Furthermore, the particles might not even be separate, but linked together to form some network, or the liquid might contain complex additives. This inherent complexity makes it difficult, perhaps impossible, to fully characterize a real heterogeneous system except in the simplest cases. However, we do not always need a complete, detailed characterization; a somewhat simplified picture can often be sufficient for a given particular purpose.

1. , independent on the sample volume) parameter that characterizes the liquid mass per unit volume and is expressed in units of kg/m3. Since the volume of the medium changes with temperature, the density is also temperature dependent. There are some empirical expressions for this temperature dependency [3]. The density of the medium is assumed to be independent of the ultrasound frequency. 2. Rheological Parameters Viscosity and elasticity are rheological parameters of general interest for any material.

This model ignores advection as well. This model requires also information on the primary size. It is possible to use this parameter as adjustable, instead of a standard deviation. This means that for the purpose of the fitting attenuation spectra we consider a monodisperse collection of aggregates with the same size and the same primary size. These two numbers are adjustable parameters instead of the median size and standard deviation of the lognormal particle size distribution (PSD). 3. Porous Body A porous body differs from a porous particle because of its large external dimension.

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