A Langmuir-Blodgett instrument has been assembled that is capable of providing side-by-side comparisons of two separate monolayers in a true double-beam absorption geometry with no moving parts. Absorbance spectra of two different films are monitored at the air/water interface, with the use of fiber optics in conjunction with a charge-coupled-device detector and a single-stage spectrograph. The utility of this instrument is demonstrated by simultaneous measurement of monomer, dimer, and aggregate components in a single-component carbocyanine dye monolayer and a mixed carbocyanine dye/phospholipid monolayer, as the isotherm of each of these films is generated. A linear relationship between number density and the carbocyanine monomer/dimer ratio is observed.

PDF Article

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription