Perfluoro octane sulfonates

This means that for 1-alcohols, CH3-(CH2) -CH20H, the A parameter (n = 0) is in principle the AG" value of ethanol, and for hydrocarbons the A value is AG" of ethane. Values of the A and B parameters for the varions systems are presented in Table 6.8. Basically all systems fit Equation 6.28 well, and it also turns out that the B parameter is surprisingly constant for nearly all systems. Exceptions are phenylalcohols in sodinm deoxycholate micelles and primary alcohols in lithium perfluoro-octane-sulfonate. The average value of the B parameter for all other systems is -2.48 0.06 kJ/mol... 

As a thermally driven process, the photoacid diffusion length and rate in CARs is temperature dependent, as illustrated in Fig. 17.24 for the diffusion of perfluoro-octane sulfonate photoacid in partially protected poly(4-t-butyloxycarbonyloxy-strene)-based resist. Within normal processing conditions, the higher the PEB temperature, the faster is the rate of the photoacid diffusion and the longer is the diffusion length. Although the PEB temperature can be used to modulate photoacid diffusion and consequently resist sensitivity, it nevertheless involves a trade-off... 

Perfluorochemicals are used in the manufacturing of food packaging materials and cookware. Perfluoro-octane sulfonate (PFOS) is a residual impurity in some paper coatings used for food contact. Perfluoro-octanoic acid (PFOA) is contained in nonstick cookware coatings. Recent epidemiological studies have shown that both PFOS and PFOA are widely present in human blood [59]. 

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