Method and system for Langmuir-Blodgett assembly

A system for forming a film, comprising:

• a trough containing water defining an air-water interface between air and the water, and having at least two barriers being separated from and movable in parallel to each other to define an area therebetween on the air-water interface;
• an electrospraying device comprising a syringe having a metal needle connected to a power supply set at 10 kV and positioned above the air-water interface, configured to spread a solution containing a material of interest onto the air-water interface of water at a feed rate in a range of 0.5-2.0 ml/h, without producing air flow to disturb the air-water interface, to form a film of the material of interest in the area between the at least two barriers at the air-water interface;
• and
• a grounding wire submerged in a water subphase from a place outside the area between the at least two barriers in the trough,
• wherein the area between the at least two barriers is changeable by parallel moving the at least two barriers on the air-water interface so as to tune a particle packing density of the film formed in the area;
• and
• wherein the trough is equipped with a tensiometer and a dip coater for recording an isothermal surface pressure-area curve of the film formed in the area.