New PDF release: Analytical Ultracentrifugation V

By W. Mächtle (auth.), Helmut Cölfen (eds.)

ISBN-10: 3540487034

ISBN-13: 9783540487036

ISBN-10: 3540661751

ISBN-13: 9783540661757

The foundation for this quantity is the eleventh Symposium on Analytical Ultracentrifugation held in March 25-26, 1999 on the collage of Potsdam, Germany. This e-book offers a complete choice of 33 contributions from prime scientists during this box including:
Technical and methodological innovations.- concepts in facts analysis.- Hydrodynamics/Modelling.- man made polymers, colloids and supramolecular systems.- organic systems.- Interacting structures and assemblies.
In distinction to the expanding importance of analytical ultracentrifugation, similar glossy books are very infrequent. hence, this quantity might be a important resource of knowledge to somebody who desires to meet up with the newest advancements and effects relating to this significant analytical method.

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Extra resources for Analytical Ultracentrifugation V

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Theory For polymer solutions the sedimentation coecient of component 2, s2, is de®ned as the ratio of the velocity of the particles of component 2 and the centrifugal acceleration. s2 ˆ dr2 adt Y x2 r2 …1† where r2 is the distance of component 2 from the axis of rotation and x is the angular velocity. Fig. 1 Schematical representation of the movement of a boundary versus the radial distance during a sedimentation velocity run observed with UV absorption optics at four di€erent times (t1

19) etheo ˆ f …rP Y rm † ˆ …grm ‡ f† X grm …25† Equation (25) was used to calculate etheo for the values of rP which were used to derive the sedimentation coecient due to the di€erent methods, with the experimentally determined positions of rm: rP ˆ 6X8 cm rP ˆ 6X9 cm rP ˆ 7X0 cm etheo ˆ 2X13 etheo ˆ 2X16 etheo ˆ 2X18 X The results show that the dependence of Atheo on changes in rP is rather small ($2%) and therefore this dependence can be neglected. The same result is obtained if Eq. (19) is developed into a geometrical series.

The cell height does not depend on ri and can be eliminated. The sector shape of the cell can be taken into consideration by means of a factor H=(sin ///). Due to this, Eq. (10) can be rearranged to give [15] ‚ rP ™2Yi ri2 dri sin / r2YS ˆ ‚rrmp Y …12† / rm ™2Yi ri dri By means of Eq. (12) it is possible to calculate the position of the local centre of mass r2,S, if the mass concentration c2,i as a function of ri is measured. The sedimentation coecient s02 due to the centre-ofmass method is derived by means of Eqs.

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Analytical Ultracentrifugation V by W. Mächtle (auth.), Helmut Cölfen (eds.)


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