By Gary D. Christian

ISBN-10: 0471214728

ISBN-13: 9780471214724

Commonly revised and up-to-date with a extra smooth taste and a brand new, two-color layout, this 6th variation offers with rules and strategies of quantitative research. Examples of analytical concepts are drawn from such components as existence sciences, medical chemistry, air and water pollutants, and commercial analyses. New to this version: Excel spreadsheets on CD-ROM * New chapters on sturdy laboratory perform, in addition to genomics and proteomics * A extra glossy style.

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If this is not possible, the parallel disc system has to be used instead. The (constant) shear stress in a cone and plate system depends on the cone radius R and is given as *mJZ* (3,9) A greater cone radius increases the measurement sensitivity for smaller torques or shear stresses. 20) The simplified equation presumes that at small angles a tana is equal to a. As mentioned above, a=\" is preferred. 3 Parallel Discs Parallel disc systems have the advantage that even solutions with larger particles or highly viscous or elastic liquids can be measured, since the liquid is, unlike the cone and plate system, not squeezed in a narrow slit.

6) though, but correction times i? are listed by the manufacturer for the particular capillary and have to be subtracted from the measured running times r. 34) The running times that are tabulated together with the correction times also give information on the range of running times for which a sensible evaluation is possible. 2). For capillaries with big inner diameter (bigger than No. 2) a Hagenbach correction is not possible, because the correction would only apply for running times below the minimum running time.

The diameter of the sphere should not be too small. 1 mm, the effects of roughness of the tube and sphere gain too much influence on the results. An evaluation of the shear rate is not possible, so that an application of this type of viscosimeter for fluids with a strong non-Newtonian flow behavior is not advisable. An attempt to empirically determine the shear rate in a micro falling sphere viscosimeter is described in [23]. 3 The Viscobalance The principle of the viscobalance as a "pulling sphere viscosimeter" is related to the falling sphere viscosimeter.

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