Effect of Aerosol Generation Method on Measured Saturation Pressure and Enthalpy of Vaporization for Dicarboxylic Acid Aerosols

Figures & data

FIG. 1 Schematic of IVM experimental setup. For homogeneous condensation, the 6-jet atomizer is replaced with a CMAG, and the diffusion dryer is removed.

TABLE 1 Enthalpies of vaporization and saturation pressures at 298 K of the dicarboxylic acids. The bounds given are 95% confidence intervals on the fit parameters

Acid	Generation method	Psat,0 (10^−5 Pa)	Δ H (kJ/mol)
Adipic	atomization	3.3 (± 0.9)	132 (± 8)
	homogeneous condensation	4.2 (± 2.2)	126 (± 21)
Azelaic	atomization	1.4 (± 0.5)	145 (± 15)
	homogeneous condensation	0.9 (± 0.3)	158 (± 17)

FIG. 2 Measured change in total volume concentration of adipic acid (a) and azelaic acid (b) aerosol particles versus inverse of set-temperature.

FIG. 3 SEM images for (a) adipic acid generated by homogeneous condensation, (b) adipic acid generated by atomization, (c) azelaic acid generated by homogeneous condensation, and (d) azelaic acid generated by atomization.