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Product Name: Langmuir Troughs
Product Description
Langmuir Troughs are capable of supporting
monolayer films at the air-water interface. Once compressed, a monolayer film
can be considered to be a two-dimensional solid film with a surface area to
volume ratio far above that of bulk materials. At these conditions, materials
often yield fascinating new properties. The Langmuir Trough allows us to infer
how particular molecules pack together while confined in two dimensions. The
surface pressure-area isotherm can also provide a measure of the average area
per molecule and the compressibility of the monolayer.
Microscopy of a monolayer can be performed
on any Nima Microscopy Langmuir Trough, which contains a sapphire window in the
trough base allowing high optical transmission down to a wavelength of 200nm.
UV-Visible Absorption Spectroscopy of monolayers on the Microscopy Langmuir
Trough can also be used to determine how absorbing molecules interact with one
another when compressed to various surface pressures.
When photoluminescent materials are being
studied, the Inverted Microscopy Troughs allow a microscope objective lens to
reach within 1.2mm of the monolayer, from beneath, so that very low wavelength
light can stimulate the monolayer from above. Brewster Angle Microscopy can also
be employed to image the domain packing and homogeneity of monolayer films on a
Langmuir Trough.
Precision control of the surface pressure is
achieved using a sensitive computer-controlled feedback system between the
Surface Pressure Sensor and the compression barriers. Compression barriers are
made from Delrin, for enhanced monolayer stability, but PTFE compression
barriers can also be supplied upon request.
Langmuir
Trough size options:
All Nima Langmuir
Troughs are machined from a single piece of PTFE and have a subphase depth of
4mm except for the Liquid-Liquid Langmuir trough which has a total depth of 8mm.
The Small
Langmuir Trough has a subphase area of 15x7cm and a maximum monolayer
containment area of 85cm2. It requires approximately 50ml of liquid
to form a subphase. This is ideal for studies of expensive, exotic materials or
when bench space is a large concern.
The Medium Langmuir Trough has a
subphase area of 30x10cm and a maximum monolayer containment area of 265cm2. This
gives a large compression ratio, suitable for compression of a larger range of
molecules. The larger area improves positional accuracy of the surface
pressure-area isotherm plots from which the area per molecule is determined.
Langmuir-Schaefer horizontal dipping is also possible on this trough.
The Large
Langmuir Trough has a subphase area of 30x20cm and a maximum monolayer
containment area of 535cm2. This trough can comfortably accommodate
the
Nima MicroBAM monolayer visualisation
instrument across the centre-line of the compressed monolayer. A large amount of
Langmuir-Schaefer horizontal dipping can be performed from one compressed film.
Microscopy Langmuir Troughs with UV-visible
transmission windows are also available for microscopy and spectroscopy
applications.
Liquid-Liquid Langmuir Troughs are available
for monolayer investigations at the interface between two liquids.
All Nima instruments are covered by a three year warranty. If a fault
develops during this time, we will repair the instrument free of charge.
Company Details
ima Technology
manufacture scientific instruments for the fabrication and characterisation of
thin films. Our instruments can fabricate films with a thickness as small as a
couple of nanometres, just one molecule thick.
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