Preferred Label : Newton black film;
IUPAC definition : In soap films, two types of equilibrium film are often observed, sometimes successively
in the same system: one characterized by thicknesses of the order of 7 nm or more
which varies significantly with minor changes in composition such as ionic strength,
and the other having a lesser thickness relatively independent of such changes. When
a distinction is needed, the former are designated as common black films, and the
latter as Newton black films. The current use of first or secondary for the common
black film and of second, primary or Perrin's for the Newton black film is discouraged.;
Origin ID : N04136;
See also
In soap films, two types of equilibrium film are often observed, sometimes successively
in the same system: one characterized by thicknesses of the order of 7 nm or more
which varies significantly with minor changes in composition such as ionic strength,
and the other having a lesser thickness relatively independent of such changes. When
a distinction is needed, the former are designated as common black films, and the
latter as Newton black films. The current use of first or secondary for the common
black film and of second, primary or Perrin's for the Newton black film is discouraged.
