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Diffusion is caused by random molecular motion that leads to complete mixing. In chromatography, the diffusion coefficient refers to the diffusion of a solute in a relatively or very dilute solution. So far, a number of experimental methods such as solid dissolution (SD) [10,11] pseudo steady-state solid dissolution (PSTD) [12] photon correlation spectroscopy (PCS) [13] radioactive tracer response (RTR) [14,15] nuclear magnetic resonance (NMR) [16,17] Taylor-Aris dispersion [18,19] modified Taylor- Aris dispersion [20,21] and chromatographic impulse response (CIR) [22,23] have been developed for measuring binary diffusion coefficients in SCFs. Among the above methods, most literature data [24-26] on binary diffusion coefficients in SCFs have been made by the Taylor-Aris dispersion and the CIR methods. The latter involves chromatographic adsorption, and the former does not.
Citation: Kong CY (2014) Measurements of Binary Diffusion Coefficients in Supercritical Carbon Dioxide. J Chromatograph Separat Techniq 5:e127. doi:10.4172/2157-7064.1000e127
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