The conventional Langmuir Trough is available in three sizes
Also available are Liquid-Liquid and Microscopy Langmuir Troughs
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.
The Nima MicroBAM (Brewster Angle Microscope) can also be employed to image the domain packing and homogeneity of monolayer films on a Langmuir Trough.
The Nima surface potential sensor can also be used to determine the electrical properties of molecules at the air-liquid interface.
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.
The transfer of monolayers from the air-water interface on to a solid substrate for further investigation can be performed using a Langmuir-Blodgett (LB) Deposition Trough.
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.
All Langmuir and LB Deposition Troughs come complete with computer interface unit, power supply, cables, USB adapter, mini-toolkit, surface pressure sensor, Wilhelmy plates, calibrated software, hardback user manual, Interfacial Science textbook and a monolayer kit to get you started making monolayers.
We have price lists available for UK, Europe and USA. If you require a price list in your local currency or require a firm quotation please contact us.
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.
