Suspensions foodstuffs

With heterogeneous substances such as foodstuffs, many of which are filled suspensions of proteins, carbohydrates and triglycerides, it can be theorized that complex ionic interactions generating repulsive forces could occur and cause wall-slip. 

Suspensions or dispersions of particles in a liquid medium are ubiquitous. Blood, paint, ink, and cement are examples that hint at the diversity and technological importance of suspensions. Suspensions include drilling muds, foodstuffs, pharmaceuticals, ointments and cremes, and abrasive cleansers and are precursors of many manufactured goods, such as composites and ceramics. Control of the structure and flow properties of such suspensions is often vital to the commercial success of the product or of its manufacture. For example, in consumer products, such as toothpaste, the rheology of the suspension can often determine consumer satisfaction. In ceramic processing, dense suspensions are sometimes molded (Lange 1989) and then dried and sintered or fired into optical components, porcelin insulators, turbine blades, fuel cells, and bricks (Rice 1990 Simon 1993). Crucial to the success of the processing is the ability to transform a liquid, moldable suspension into a solid-like one that retains its shape when removed from the mold. These examples could be multiplied many times over. 

Magnesium, calcium, iron Foodstuffs Microwave-assisted sample digestion with concentrated nitric acid UV-Vis 5.0- 50.0 mg L 15.0- 150 mg L 2.0- 20.0 mg L 1 Sequential injection system direct [432] sample introduction as a natural suspension or as a slurry open digestion vessel inside a microwave oven... 

The scant experimental data [Rajaiah et al., 1992] for suspensions ( < 0.3) of alumina (0.5-0.8 pm) particles in a paraffin hydrocarbon are in line with the predictions of equation (6.4). An exhaustive review of the thermal conductivity of structured media including polymer solutions, filled and unfilled polymer melts, suspensions and foodstuffs has been published by Dutta and Mashelkar [1987]. Figure 6.1 shows the predictions of equations (6.3) and (6.4) for a range of values of (ki/ks)-, the two predictions are fairly close, except for the limiting value of ki/ks = 0. 

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