Nanoparticle Deposition via Non-Aqueous Solvents
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Solution Overview
Problem
Current electrophoretic deposition processes face challenges in controlling the deposition of nanoscale particles, which are essential for creating coatings with interesting and useful properties, particularly in achieving high energy density and efficient power storage and discharge devices.
Innovation Solution
The technology involves synthesizing quantum-confined silicon and germanium nanocrystals with a crystalline core surrounded by an amorphous shell, which are deposited onto a conductive substrate using electrophoretic deposition. Internal stress is increased through lithium intercalation, enhancing the piezoelectric effect and energy density, and a metal film is applied to protect the nanoparticles and facilitate energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrophoretic deposition is used to deposit nanoscale particles, then coatings with interesting and useful properties can be achieved, but the process becomes more difficult to control
Solution Approach 1:
The patent changes the physical-chemical parameters of the colloidal suspension by using non-aqueous solvents instead of water, adjusting pH levels, and modifying particle surface charges. These parameter changes enable better control over the electrophoretic deposition process while maintaining nanoscale particle characteristics, resolving the contradiction between particle size and process controllability
Solution Approach 2:
The patent employs non-aqueous (inert) solvent environments for the electrophoretic deposition process. This inert environment prevents unwanted chemical reactions that occur in aqueous systems, particularly avoiding water electrolysis and oxygen evolution, thereby improving process control while enabling the use of nanoscale particles
2Reliability
If aqueous colloidal suspensions are used for electrophoretic deposition, then the process is well-established, but oxygen evolution occurs due to water electrolysis at high voltages
Solution Approach 1:
The patent converts the harmful effect of water electrolysis into a beneficial approach by completely replacing water with non-aqueous solvents. This eliminates the oxygen evolution problem entirely while maintaining the electrophoretic deposition mechanism, transforming a fundamental limitation into an opportunity for process improvement
Solution Approach 2:
By using non-aqueous solvents as the colloidal suspension medium, the patent creates an inert environment that does not undergo electrolysis. This eliminates the generation of harmful oxygen gas while maintaining process stability and reliability, directly addressing the contradiction between reliable deposition and harmful byproduct generation
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 approach results in a significant amplification of the nanoscale piezoelectric effect, leading to high energy density and efficient power storage and discharge capabilities, with the ability to power external devices effectively.
Implementation Method 1
Electrophoretic deposition is a process by which particles desired to be plated or deposited onto a substrate are first colloidally suspended and then urged out of suspension and onto a substrate by means of an applied electric field
Implementation Method 2
Particles are deposited onto a conductive substrate by electrophoretic deposition and self-align according to their respective dipole moments to form a unified Weiss domain throughout the film
Implementation Method 3
Internal stress in the particles making up the film can be increased by intercalation of smaller atoms, such as lithium
Implementation Method 4
The novel technology relates to an amplified piezoelectric effect resulting from quantum confined silicon and germanium nanocrystals synthesized in a predetermined state of stress
Data Source
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AI summary
An electrically transductive device, including a substrate having an electrically conducting surface portion, a first film of semiconducting nanoparticles positioned on the electrically conducting portion and further including a first plurality of close packed first generally spherical particles defining a first plurality of interstices and a second plurality of second, smaller generally spherical particles substantially filling the plurality of interstices, and a first coating of electrically conductive metal deposited over the first film.