Kibron MicrotroughXL is a medium sized Langmuir instrument. The core technology, Kibron's sensor (0.2 microgram resolution), records surface pressure with a very high sensitivity, better than 0,01 mN/m, yielding excellent reproducibility. The instrument features adjustable feet and protective enclosure. Heat control plate with for connection to an external bath is available as an accessory.
We have two different trough materials available, namely PTFE (Standard) and stainless steel with PTFE edges. The hydrophilic bottom of the steel trough allows for a significantly smaller subphase volume. Trough models for various purposes are available in the webshop or on request. Other materials, custom troughs and designs, including previously sold troughs, are available on request. We recommend POM barriers. PTFE barriers are available from the webshop or on request..
The instrument is controlled by the recently released FilmwareX4.0. The software has a intuitive design, which allows the users to effortlessly do and review experiments.
|#6034||Langmuir force balance for surface pressure measurements|
|#1500||Set of DyneProbes, 4 pcs|
|#6039||Aluminium Base Plate with stepper motor||#6407||Set of Two Barriers (POM)|
|#3530||Sample cup (PP), set of 50 pcs (For calibration and surface tension measurements)|
|#6235||Acrylic cover box|
|#6122||FilmWareX 4.0 Software License|
|#6199||MicroTrough User Manual|
|#6309||Power supply (110V-240V AC/12V DC)|
|#1502||Mains adapter US/JPN/EU/UK|
|#6238||Connecting cable, 2pcs|
|Base mechanics||33 x 14 x 6 (h) cm ( 13 x 5.5 x 2.4 inches)|
|Electronics||27 x 23 x 8 cm (10.6 x 9 x 3.1 inches)|
|Total weight||3.55 kg (7.8 lbs)|
|Acrylic casing||Prevents perturbation of the film by air flow and accumulation of dust into the interface. Allows for the use of protecting gas to reduce oxidation and photobleaching in fluorescence microscopy and spectroscopy.|
|Dimensions||Outer base plate dimensions 33 cm x 14 cm (13.0 in x 5.5 in)|
Control of film area
|Barriers||Made of hydrophilic, inert polymer (POM). PTFE barriers are available upon request.|
|Compression velocity||Can be freely varied between 0 and 200 mm/min (one barrier)|
|Accuracy||Better than 0.1 %|
|Barrier motion||High precision microstepping motor guarantees extremely precise and smooth control of area|
|Software||All measurements are computer controlled, with real-time display of retrieved data|
Measurements of surface pressure (Surface tension)
|Principle||Wilhelmy method using a small diameter ( 0.51 mm) special alloy wire. No artefactual hysteresis as when using the conventional Pt-plates. No drying and accumulation of salt which cause significant errors when filter paper is used. Other probe materials and shapes available on request.|
|Dynamic range||0 to 130 mN/m|
|Resolution||10 µN/m (1.6 µg)|
|Temperature sensor||KTY. Resolution 0.1 degrees.|
Full PTFE or Stainless steel with PTFE edges. Several designs available on request.
145 ml in Full PTFE Langmuir-troughs, and 270 ml in Full PTFE Langmuir-Blodgett troughs. 45-90 ml in stainless steel Langmuir trough. Subphase can be magnetically stirred. 300 µl in surface pressure measurements (Multiwell plate).
Subphase area 23.0 cm x 5,9 cm (9.1 in x 2,3 in)
Compression isotherm for a phospholipid (DPPC) monolayer
The basic operation of a Langmuir-trough is the recording of a compression isotherm for an amphiphile film residing on an air(gas)/water interface. For this, a small, known quantity of the material of interest is dissolved in a volatile solvent (such as chloroform) and is then carefully applied onto a clean water surface. In the case demonstrated below a phosphoplipid, 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (abbreviated as DPPC) was used. After the evaporation of the solvent, the film is compressed by the barriers, while the surface pressure is recorded as a function of area. The obtained isotherm is characteristic for the molecule(s) in the film. The rate of compression in the below simulation is greatly exaggerated.