Physical Chemistry

An Introduction to Dynamic Light Scattering by by Kenneth S. Schmitz PDF

By Kenneth S. Schmitz

ISBN-10: 0126272603

ISBN-13: 9780126272604

Dynamic gentle scattering (DLS) innovations supply information regarding measurement, form, and suppleness of debris in addition to delivering perception about the nature of the interactions among debris and their environments. This ebook bargains a learn of DLS by way of macromolecular and polyelectrolyte answer

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Example text

Hcp/Re for the cp = 0 are shown above for the angle range 0° < θ < 50° for T 7 D N A . [Reproduced with permission from H a r p s t (1980). Biophysical Chemistry. 11, 2 9 5 - 3 0 2 . 8. [R(a-R(Oe]}\. 3) Further simplification is achieved if pairwise interactions are assumed to s be the dominant interaction. The difference R(f')p ~ R(î')q i expressed as , R ( i ' ) ! — r(f'), where R ( i ) i locates the center of mass of one of the particles and r(f') represents the location of particle 2 from a coordinate system whose o v er a origin is at particle 1.

17. 1) where AG[AC p (r,0)] is the free energy associated with the fluctuation. If the particles are noninteracting (AH = 0), then AG[AC p (r,0)] = — T A S [ A C p ( r , 0 ) ] . 2) AVNA, where <«,>„ is the uniform (equilibrium) number of particles in the volume and <5n, is the number fluctuation. n !. 3) 3 < n i > u! < n 2 > u ! < « 3 > u ! 4) u with < C P > U = C p . If one now substitutes an integral for the summation and (5Cp(r,0) for <5C;, and then expresses <5Cp(r,0) as the Fourier transform of 38 2.

The agreement is quite good. 8. 1) and 2 ^ L ' · 2 ) ( 1 8 where yL and Y|( are "end effects" and ρ = L/2RC. Broersma (1960a, 1960b) first examined the "end effects" on the translational diffussion of cylinders. Tirado and Garcia de la Torre (1979) examined the end effects for both a "capped" cylinder and an "open-ended" cylinder, where they used spherical subunits to mimic the cylinder surface (the "shell model"). Their calculations involved a series of bead radii and an extrapolation to σ = 0, which would be the classical limit to a smooth surface.

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An Introduction to Dynamic Light Scattering by Macromolecules by Kenneth S. Schmitz


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