Ammonium perfluorononanoate (APFN) is an anionic surfactant that in water forms liquid crystalline phases (Lyotropic liquid crystal). It is the ammonium salt of perfluorononanoic acid.
Names | |
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IUPAC name
Heptadecafluorononanoic acid ammoniate (1:1)
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Identifiers | |
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3D model (JSmol)
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ChemSpider |
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ECHA InfoCard | 100.242.185 |
PubChem CID
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CompTox Dashboard (EPA)
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Properties | |
C9H4F17NO2 | |
Molar mass | 481.106 |
Density | 1.753 g/mL |
Boiling point | 196 °C (385 °F; 469 K) |
Surface tension: | |
~8.0 mmol/L[1] | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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The phase diagram of APFN/H2O system is delineated by the presence of a lamellar phase and a nematic phase with awide isotropic solution. The nematic phase is of the type I, and the aggregates have a positive and diamagnetic anisotropy. In the presence of a magnetic field, the aggregates align parallel to the field direction. The change of phase at the lamellar-nematic temperature has been ascribed to order-disorder transitions.
It has recently been shown that the lamellar phase of the APFN/2H2O system form multilamellar vesicles under shear rate.[2]
In 2020, a California bill was passed banning APFN as an intentionally added ingredient from cosmetics.[3]