Download e-book for kindle: Analytical Ultracentrifugation of Polymers and Nanoparticles by Walter Maechtle

By Walter Maechtle

ISBN-10: 3540234322

ISBN-13: 9783540234326

ISBN-10: 3540262180

ISBN-13: 9783540262183

This e-book is split into chapters overlaying instrumentation, sedimentation pace runs, density gradient runs, software examples and destiny advancements. specifically, the precise program bankruptcy demonstrates the flexibility and gear of AUC by way of many attention-grabbing and critical business examples. therefore the e-book concentrates on useful features instead of information of centrifugation concept.

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Additional resources for Analytical Ultracentrifugation of Polymers and Nanoparticles (Springer Laboratory)

Sample text

It is mainly used with Schlieren optics and the turbidity detector. (ii) The double-sector centerpiece has two separate chambers, one for the sample solution, the other for the solvent. It is used with all detecting systems (interference optics, UV/Vis absorption, and Schlieren optics). (iii) Multi-channel centerpieces for 3–5 different samples can exhibit very different architectures (see Fig. 7c,f). In principle, they are double-sector centerpieces. They are applied exclusively in equilibrium runs (see Chap.

5 K, or better, has to be guaranteed. Svedberg’s first AUC contained a safety chamber that was continuously flooded with gaseous hydrogen to create small drag, and to allow control of the temperature within the chamber. In later developments, the rotor-containing safety chamber was evacuated to guarantee the smallest possible air-friction resistance to the rotor’s movement, thus eliminating rotor heating by air friction. 20 2 Analytical Ultracentrifugation, Instrumentation Fig. 2. Modern analytical ultracentrifuge Optima XL-A/I produced by Beckman-Coulter In the former Beckman Model E, cooling of the chamber was achieved by water cooling of a cladding surrounding the rotor inside the chamber.

7d,e). They are designed to allow the layering of solvent (or solution) onto a sample solution (or solvent) while the rotor is spinning (see Chap. 3). In most cases, the channels of the centerpieces are sector-shaped to prevent convection during sedimentation due to the radially sedimenting sample. The standard thickness of centerpieces is a = 12mm. 3 Measuring Cells 27 Fig. 6. Cell assembly with an (elastic) Kevlar double-sector centerpiece, which needs no gaskets between windows and centerpiece.

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Analytical Ultracentrifugation of Polymers and Nanoparticles (Springer Laboratory) by Walter Maechtle


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