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::: LT-202 :::
A device for application of monomolecular films
according to the Langmuir—Blodgett (LB) techniquee
LB trough
A device for film application by
Langmuir—Blodgett technique LT-202

Langmuir—Blodgett trough LT-202 is intended for

  • application of monomolecular films on solid samples according to the Langmuir-Blodgett (LB) technique or to the horizontal precipitation (HP) technique
  • deposition of multimolecular films using corresponding layer-by-layer technique
  • formation of mono- and multimolecular composite coatings on solid surfaces
  • modification of the surface properties (hydrophilic behavior, optical, electrical properties etc. )
  • fundamental research in ultrathin film fabrication and their use as insulating and protective coatings, molecular electronic elements, in biology for creation of bilayer lipid membranes etc.

* Some units of Langmuir—Blodgett trough LT-202 has been designed in cooperation with Institute for Chemistry of New Materials of National Academy of Sciences of Belarus (Minsk, Belarus) and A. V. Lykov Heat and Mass Transfer Institute of National Academy of Sciences of Belarus (Minsk, Belarus).

Full free surface area: 800 cm2
Maximum free surface area confined with the barrier: 744 cm2
Compressed (effective) area: 560 cm2
Liquid medium volume: 2000-2100 cm3
Dipping well: 75 mm deep, diam. 60 mm
Maximum dimensions of the immersed substrate: 70х55x4 mm (h-w-t)
Number of barriers: Two
Velocity range of the barrier motion: - single side compression – 0.01 to 180 mm/min
- symmetrical compression – 0.02 to 360 mm/min
Dipper mechanism stroke: 86 mm (verticalposition of the unit can be adjusted manually)
Dipper mechanism velocity range: 0.01–40 mm/min,
Step of the dipper mechanism velocity change: 0.1 mm/min
Possibility of altering different monomolecular layers deposition: Available
Delay between the layers deposition: 0–100000 s
Surface tension sensor: Wilhelmy plate (vertical position of the sensor can be adjusted manually)
Working range of the surface tension sensor: 0-80 mN/m (stepped and fine adjustment of the range are available)
Sensitivity of the surface tension sensor: 0.01 mN/m
Number of surface tension sensors: Two
Unit for substance layer-by-layer self-assembling from solutions: - number of vessels – 23 (holes diam. 42 mm)
- number of application cycles – unlimited
- the vessel cassette feed velocisty – 2.2 rev/min
Doser for substance feed to aqueous surface: - substance reserve – 1 ml
- motion range of leading rod – 0-40 mm
Overall dimensions: Trough with mounted rig - 800x300x520 mm (w-d-h); Control unit - 185x240x105 mm (w-d-h);
Weight 14 kg.
Supply voltage: 220 V 50 Hz
Power consumption: not more than 100 W
Additional accessories:
  • Substrate clamping holder for fixing the sample on the dipper lever.
  • Rig for film application by the horizontal precipitation method (by liquid medium draining)*.
  • Rotating barrier for substance film transfer into the working zone.
  • A unit for tape substrate winding with two guides.
  • A doser for substance feed on water surface.
  • PTFE inserts for reduction of the working fluid volume.
  • A jacket for for liquid thermostating of the trough in range 0°С...40°C by outer facilities.
  • A PTFE aspirator for water-jet pump assembling.
 Deposition of X-type LB film
 Deposition of Y-type LB film
 Deposition of Z-type LB film
  Note. * Horizontal precipitation (HP) method (by liquid medium draining) is developed by scientists from Institute for Chemistry of New Materials of National Academy of Sciences of Belarus (Minsk, Belarus). [Article]
    The method provides surface modification by extremely uniform and homogenous monolayer films (see, for example this paper). HP method allows transferring of monolayer films at various surfaces simultaneously from huge variety of surfactants (both in solid and liquid state) despite of polar head structure. The process of deposition is simple and fast. In particular, the surface of metallized silicon wafer can be modified by HP method within 3–5 minutes.

 Layer-by-Layer technique is fulfiled with use of additional accessories in the set of LB trough LT-202.
  Roll-To-Roll deposition technique engages additional accessories in the set of LB trough LT-202 to deposit monomolecular film on tape (continuous deposition on flexible substrate).
1 Basic set akso inckludes control software (for Win32) and operation manual.
Code Name Q-ty
LT-202-010 LB trough with basic accessories (Substrate clamping holder for fixing the sample on the dipper lever; Rig for film application by the horizontal precipitation method; PTFE inserts for reduction of the working fluid volume; A jacket for liquid thermostating by an external device; Aspirator (PTFE nozzle for water-jet cleaning of the liquid surface in the trough) 1
LT-202-020 Dipper unit 1
LT-202-030 Surface pressure sensor 2
LT-202-040 Control electronic unit1 1
LT-202-025 Layer-by-Layer deposition set including a rotating platform for vessels and a rotating patform for dipper unit 1
DT-03 A microdoser for feeding the deposited film on the aqueous surface 1
LT-202-050 A rotating barrier for the monomolecular film transfer into working (deposiotion) area 1
LT-202-060 A mounted unit for the tape substrate winding in set with two guides 1
LT-202-090 A set of calibrating surfactants: stearic acid, behenic acid, acetyl alcohol. ask
1 Basic set also includes control software (for Win32) and operation manual.

* Host PC is not included in the delivery set

Dipper on rotary platform Turntable Doser DT-03
Dipper unit
on the rotating platform
A rotating platform of the
Layer-by-Layer deposition set
Tape winding rig Rotary barrier
A mounted unit for the tape
substrate winding
A rotating barrier
Set of two guides
A set of two guides
for tape substrate
Aspirator (PTFE nozzle
for water-jet cleaning)

Panel of LB trough control software

Software for LB trough control and data acquisition is a Win32 application running under OS Windows 95/98/Me/NT/2000/XP/Vista.

The software is built according to the modular scheme oriented to perform specific application technique and provides all preliminary settings and calibration necessary for the LB trough operation as well control over the systems (mechanisms of the barrier movement and sample dipping/lifting) at the film application.

Acquired data can be saved in special format or text files and can be then processed, visualized and analysed in the program itself or with third party software (e.g. SurfaceXplorer package or Microsoft Excel).

Minimal configuration of host PC (not included in the delivery set): Celeron® 1.7 GHz, RAM 512 MB, HDD 160 GB, VRAM 64 MB, monitor 1024x768x32 bit, MS Windows® XP SP2, 1 free USB port.

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