Electrospraying Large Sparingly Soluble Tetraalkylammonium Ions as Monomobile Standards of Moderately Low Electrical Mobility

Figures & data

FIG. 1. Mobility spectrum for a spray of tetrahexadecylammonium bromide, showing on its right boundary the sharp peak associated to (C₁₆H₃₃)₄N⁺.

FIG. 2. Mobility spectra from sprays of (C₁₈H₃₇)₄N⁺Br⁻ (open circles) and (C₇H₁₅)₄N⁺Br⁻ ions (filled circles) taken under identical conditions of the DMA. The dominant and most mobile peak in the spray of (C₁₈H₃₇)₄N⁺Br⁻ is (C₁₈H₃₇)₄N⁺.

Table 1 Measured electrical mobilities Z in laboratory air based on the (C₇H₁₅)₄N⁺ ion standard

Ion	Ion mass (Da)^a	Z (cm^2/V/s)
(C18H37)4N^+	1027.1	0.5990 (±1%)
(C16H33)4N^+	901.03	0.6325 (±1%)
(C7H15)4N^+	410.47	0.9709^b

^aMain isotopic peak.

^bFrom Ude and Fernández de la Mora (2005).

FIG. 3. Mobility spectra after passing the electrospray ions through a charge-reduction chamber containing radioactive Ni-63.

Ude, S., and Fernández de la Mora, J. (2005). Molecular Monodisperse Mobility and Mass Standards from Electrosprays of Tetra-Alkyl ammonium Halides. J. Aerosol Sci., 36:1224–1237.

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