By A. Felinger
An outline of the numerical info research and sign therapy concepts utilized in chromatography and comparable separation concepts, with emphasis at the description of the symmetrical and asymmetrical chromatographic height form versions. comprises sections on information acquisition, noise, top detection, and data conception. incorporates a thorough evaluate of the information of height overlap. either theoretical and empirical types are mentioned. Of use not just in chromatography, yet in learning spectroscopic and different analytical signs.
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Extra info for Data Analysis and Signal Processing in Chromatography
Sample text
A study of surface viscosity by the damped oscillator method. „ , Canal / V Monolayer > 1 ( — V . 18. A top view of the canal-type viscometer. 2/ Α Α(κ η* = - 7 τ - ( ). 22 l τ τ0 The canal-type viscometer provides a method for surface viscosity measurement [178-180]. 18 presents a top view of this viscometer. Myers and Harkins developed the following equation for the surface viscosity in this case [181], 2 _ Δ τ ^ _ 1 3 2 ' 121 (dA/dt)' where Ziyis the applied surface pressure, a is the width and / the length of the channel, and dA/dt is the rate of emergence of the monolayer from the channel.
They were able to show that the film crystallizes with time. Fromherz et al. used medium-angle x-ray scattering to calculate film thickness in LB bilayers of cadmium salts of a series of fatty acids [240]. They reported that film thickness increased linearly with chain length, with an inclination of the chain of about 15°. Jark et al. studied LB films of cadmium arachidate by means of soft x-ray diffraction [241]. They calculated the reflectivity profile from the specular reflection and the chemical composition of the films, and demonstrated excellent agreement between experimental and calculated interference patterns.
40 H. Electron Diffraction Electron diffraction is a useful technique for the determination of the in-plane structure of thin organic films. ) possible. The disadvantage, however, is that samples have to be stable in vacuo to sustain the electron beam energies. Havinga and de Wael [282] and Germer and Storks [283] studied LB films of cadmium stéarate, but since there was no theoretical analysis available at that time, these studies, although correct, are not complete. However, Russell et al. reinvestigated these monolayers and reported that the alkyl chains in LB films of cadmium stéarate are normal to the monolayer plane, and in an orthorhombic configuration [284].
