Sep 19

Paper published in Thin Solid Films

The latest output from the collaboration between us physicists and those chemist in Cranfield Health has appeared in print in the journal Thin Solid Films. The best bits of the paper are summarised below.

Calix surfactant structure

A comparison of a calix[4]resorcinarene monolayer with (bottom) and without (top) surfactant

Calixarenes are bucket-like molecules that have been put to use in a number of approaches in sensors. By altering the active groups that are presented in  the calixarene, they can be made specific to certain agents.  The molecules have been proposed for applications ranging from uranium recovery, thorough VOC sensing to ion-selective sensing.

This paper explores the properties of a number of calix-4-resorcinarenes along with their complexes with tetraalkylammonium surfactants and their behavior in Langmuir monolayers. The main findings are:

  • anionic resorcinarenes and cationic surfactants form stable composite Langmuir films.
  • Undecyl substituted resorcinarenes form more compact films than phenyl substituted.
  • Both components of the composite are located at the air–water interface.
  • Monolayers show side-by-side rather than head to head orientation of the counterions.

Full citation:

Monolayer behavior of calix-4-resorcinarenes and their surfactant complexes
Thin Solid Films, Volume 520, Issue 23, 30 September 2012, Pages 6989-6993
Matthew Partridge, Frank Davis, Steve W. James, Ralph P. Tatam, Charl F.J. Faul, Séamus P.J. Higson

As always, a full list of publications from the Department of Engineering Photonics is available here.