Surface-Modified Nanoparticles for Superconductor Pinning Centers
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Solution Overview
Problem
Nanoparticles used as pinning centers in superconductors tend to aggregate during chemical solution deposition, leading to decreased efficiency and negative effects on critical current density, especially in high magnetic fields.
Innovation Solution
Development of nanoparticles with a weight average diameter of 1 to 30 nm, comprising oxides of Sr, Ba, Y, La, Ti, Zr, Hf, Nb, or Ta, surface-modified with organic compounds of specific formulas to prevent aggregation, and their incorporation into inks for high-temperature superconductor preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nanoparticles are used as pinning centers in superconductors, then critical current density in high magnetic fields is improved, but nanoparticles aggregate during chemical solution deposition which decreases efficiency and negatively affects critical current density
Solution Approach 1:
The patent introduces surface-modifying organic compounds as intermediaries between the nanoparticle surface and the surrounding medium. These modifiers create steric and electrostatic barriers that prevent nanoparticle aggregation during chemical solution deposition, while maintaining the nanoparticles' pinning center functionality in the superconductor matrix.
Solution Approach 2:
The patent systematically investigates and optimizes multiple parameters including nanoparticle size (1-30 nm diameter), surface charge density, and modifier concentration to achieve stable dispersions. By controlling these parameters, the patent prevents aggregation while maintaining effective pinning centers for high critical current density.
2Productivity
If nanoparticles are introduced to increase critical current density, then superconductor performance in high magnetic fields is improved, but aggregation occurs leading to decreased efficiency
Solution Approach 1:
The patent optimizes nanoparticle size parameters (1-30 nm diameter range) and surface modification parameters to achieve stable dispersions that maintain high pinning center efficiency. The systematic parameter optimization ensures both high productivity (critical current density) and reliability (pinning center efficiency) by preventing aggregation.
3Ease of manufacture
If conventional nanoparticles are used without surface modification, then preparation process is simpler, but aggregation occurs during chemical solution deposition
Solution Approach 1:
The patent incorporates surface-modifying organic compounds as intermediaries that simplify the overall preparation process by providing built-in stabilization. These modifiers are integrated into the nanoparticle synthesis or added during deposition, eliminating the need for complex separate stabilization steps while preventing aggregation.
Solution Approach 2:
The patent creates composite structures by combining inorganic nanoparticle cores with organic surface modifiers. This composite approach maintains ease of manufacture through straightforward synthesis procedures while the organic-inorganic composite structure provides inherent stability against aggregation during chemical solution deposition.
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
The stabilized nanoparticles effectively increase the critical current density of superconductors in high magnetic fields by preventing aggregation and enhancing the stability of pinning centers within the superconductor material.
Implementation Method 1
an organic compound of general formula (I), (II) or (III) is on the surface of the nanoparticles
Implementation Method 2
an organic compound of general formula (I), (II) or (III) is on the surface of the nanoparticles wherein a is 0 to 5, b and c are independent of each other 1 to 14, n is 1 to 5
Implementation Method 3
The introduction of small particles with low conductivity, so-called pinning centers, can increase the critical current density in high magnetic fields
Implementation Method 4
precipitating nanoparticles comprising an oxide of Sr, Ba, Y, La, Ti, Zr, Hf, Nb, or Ta from a suspension comprising a non-polar solvent
Data Source
Figure 1
AI summary
The present invention is in the field of nanoparticles, their preparation and their use as pinning centers in superconductors. In particular the present invention relates to nanoparticles comprising an oxide of Sr, Ba, Y, La, Ti, Zr, Hf, Nb, or Ta, wherein the nanoparticles have a weight average diameter of 1 to 30 nm and wherein an organic compound of general formula (I), (II) or (III) or an organic compound containing at least two carboxylic acid groups on the surface of the nanoparticles (I) (II) (III) wherein a is 0 to 5, b and c are independent of each other 1 to 14, n is 1 to 5, f is 0 to 5, p and q are independent of each other 1 to 14, and e and f are independent of each other 0 to 12.