Electrostatic Conductive Particle Dispersion for Uniform 2D Spacing
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Solution Overview
Problem
Existing methods for two-dimensionally arranging conductive particles on a base material are not effective in separating particles, particularly for anisotropic conductive films, as they often result in close packing or particle membrane formation rather than individual dispersion.
Innovation Solution
A method involving an electrostatic adsorption device with a disposition part and an adsorption part, where conductive particles smaller than intermediate particles are attached to the intermediate particles and reciprocated between the two parts, utilizing electrostatic forces to adsorb the conductive particles onto the adsorption part, allowing for controlled dispersion and separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If self-assembly methods are used to arrange particles on a base material, then particles can be disposed in closest packing or form particle membranes, but particles cannot be separated from each other and achieve individual dispersion
Solution Approach 1:
The patent uses an intermediate particle as a mediator to transfer conductive particles from the dispersion liquid to the base material. The intermediate particle has a larger size than the conductive particle, allowing it to be selectively adsorbed by the base material while the conductive particle remains attached to it, achieving individual particle separation and two-dimensional arrangement.
2Ease of operation
If conductive particles are directly dispersed on a base material, then individual particle separation can be achieved, but controlled two-dimensional arrangement and uniform spacing cannot be obtained
Solution Approach 1:
The intermediate particle serves as a carrier that enables controlled two-dimensional arrangement. By attaching multiple conductive particles to a single intermediate particle and using the intermediate particle's larger size for selective adsorption, the method achieves both individual particle separation and uniform two-dimensional spacing on the base material.
Solution Approach 2:
The patent changes the particle size parameter by using an intermediate particle that is larger than the conductive particle (particle size ratio of 10 to 100 times). This size difference enables selective adsorption and controlled arrangement, transforming the dispersion process from random to ordered two-dimensional structure.
3Quantity of substance
If electrostatic adsorption is used to attach particles to a base material, then particle adsorption can be achieved, but controlled density and uniform spacing cannot be obtained
Solution Approach 1:
The intermediate particle acts as a mediator that controls adsorption density. By adjusting the amount of conductive particles attached to each intermediate particle, the method achieves controlled adsorption density and uniform spacing on the base material, preventing both aggregation and excessive sparsity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables the two-dimensional dispersion of conductive particles on a base material, ensuring they are separated from each other, with adjustable adsorption density and uniform particle spacing, suitable for various electronic materials.
Implementation Method 1
the movement of the blend particle to the second electrode caused by an electrostatic attractive force generated by being charged at a polarity opposite to that of the second electrode
Implementation Method 2
the movement of the blend particle that has come into contact with the adsorption part, to the first electrode caused by an electrostatic repulsive force generated by being charged at the same polarity as that of the second electrode
Data Source
AI summary
A method for dispersing conductive particles includes: forming an electric field between a first electrode and a second electrode of an electrostatic adsorption device including the first electrode including a disposition part having electrostatic diffusivity or conductivity on which particles are disposed and the second electrode including an adsorption part having electrostatic diffusivity or conductivity and facing the disposition part, to cause a blend particle in which the conductive particles each having a particle size smaller than a particle size of an intermediate particle are attached to the intermediate particle and which is disposed on the disposition part, to reciprocate between the disposition part and the adsorption part, and to cause the conductive particles to be adsorbed onto the adsorption part.