Products > Particle Deposition System

Particle Deposition System
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Outline and Features

Particle deposition (fixing) on a substrate without aggregation is possible.

Particle Deposition System

Particle deposition (fixing) on a substrate without aggregation is possible. Particle deposition system using electro-spray.

PDS-01

Particle Deposition SystemCLICK: Zoom In/OutParticle deposition (fixing) technology is required in manufacturing process of functional substrates utilizing nanomaterial property. Normal painting is the easiest in conventional methods to form particle deposition on a substrate. However, there is a serious problem that nanomaterial properties are lost due to aggregation in the dry process of solvent.

Particle Deposition System PDS series
Particle deposition (fixing) on a substrate without aggregation is realized by electro-spray of nanosuspension. The system is possible to make particle deposition on partial or general surface by adjusting spray position on a substrate using an electric stage.


The system is possible to make a patterning by using mask with holes.
It is available not only for particle deposition but for liquid layer like spin-coater.

High voltage unit, electric-stage unit, controller, and computer is contained in the system.

Applications

Continuous electro-spray

Continuous electro-spray(1)Particle Deposition System
PDS series

Particle deposition (fixing) on a substrate without aggregation is realized by electro-spray of nanosuspension. The system is possible to make particle deposition on partial or general surface by adjusting spray position on a substrate using an electric stage.





Patterning by mask with holes

Patterning by mask with holes(CLICK: Zoom In/Out)(2)Mesh-form mask (made from UV cured resin) and pattern of VOPc nanoparticles on a substrate

The patterning like left figure is possible to conduct an electro-spray of nanosuspension through a mask on a substrate.

Features

Feature(1)
Fixing of single nanomaterial on a substrate without aggregation
Particle deposition (fixing) on a substrate without aggregation is realized by electro-spray of nanosuspension.
The system is possible to make particle deposition on partial or general surface by adjusting spray position on a substrate using an electric stage.
Feature(2)
Patterning using mask is possible
The patterning is possible to conduct an electro-spray of nanosuspension through a mask on a substrate.

Basic principle of
particle deposition of nanomaterials without aggregation

Basic principle of particle deposition of nanomaterials without aggregation
Homogeneous fixing nanomaterials on a substrate is required in the manufacturing process using nanomaterials and in the case of nanomaterials observation by SEM/TEM.

Particle deposition technology is solved these problems by applying an electro-spray.



Principle

1.
Applying voltage between nanosuspension into a nozzle and a substrate, the liquid surface at the tip of the nozzle is changed as cone shape by Coulomb force, and thin jet is form at the top of the cone shape by the reason that the Coulomb force is bigger than surface tension of the liquid.
2.
The jet divides many small droplets due to repulsive force of homopolar electric charge on the jet surface.
3.
The solvent of droplets is vaporized, then charged single nanomaterial makes a flight in the atmosphere along an electric line bound for a substrate.
4.
Nanomaterials is fixed on a substrate so that the flying single nanomaterial avoids previous reached nanomaterilal due to repulsive electrostatic force.



Permittivity of solvents

Bigger number of permittivity is better in the view of fine electro-spray formation. Permittivity of sample solution determines by kinds and concentration of solvent and involved nanomaterials.


[Reference] Permittivity of solvents
water(80) dimethylsulfoxide(47.0) toluene(2.4)
ethanol(20.7) acetic acid(6.2) carbon
tetrachloride(2.2)
methanol(32.6) 1-butanol(18.0) silicone oil(2.2)
isopropanol(18) 1-propanol(20.0) hexane(2.3)
acetone(24.3) acetic ether(6.0)  
dimethylformamide(38) tetrahydrofuran(7.5)  
nitrobenzene(34.8) diethyl ether(4.3)  

ノズルから噴霧されたジェット流が、電荷を持った液滴となり、互いに反発しながらスプレー上に拡がっています。

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Appearance of drop formation
after spray
Jet stream from nozzle changes charged droplets, they spread in the shape of a spray by an electrostatic repelling force.