Intensity Level Between SAXS and WAXS Electron Density Fluctuations

1 Intensity Level Between SAXS and WAXS Electron Density Fluctuations 

Application in Materials Science. For simple fluids the amount of the density fluctuation background can be computed. Thus its measurement can be used for the calibration of SAXS data to absolute intensity [91,94], This method is convenient if liquid samples are studied. 

For polymers the density fluctuation background is high. This is a result of its relation to the isothermal compressibility (and the velocity of sound) in the material. 

Blending of polymers or the extension of polymers with low molecular compounds is changing the density fluctuation background. Thus miscibility can be studied. 

As a function of temperature the fluctuation background is changing in a predictable way, and glass transitions in amorphous phases can be studied [93,95]. 

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