Color Manipulation via Magnetic Field Control of Nanocrystal Chains
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Solution Overview
Problem
Current methods for manufacturing articles with color details different from the background, such as two-tone colors in fabrics, face limitations in reproducing sharp lines and require complex processes like sublimation or weaving with multiple yarns, which are labor-intensive and difficult to scale for intricate designs.
Innovation Solution
Incorporating iron oxide colloidal nanocrystals into materials or transfer media, allowing for the application of a magnetic field to adjust and fix the color of the nanocrystals within chains, enabling precise control over color display and simplifying the manufacturing process by using a tuning device to manipulate the color after the initial production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional methods like sublimation or weaving with multiple yarns are used to create color details, then color patterns can be produced, but the manufacturing process becomes complex and labor-intensive
Solution Approach 1:
The invention extracts the color-changing function from complex manufacturing processes and embeds it directly into the material itself through colloidal nanocrystals. The color control mechanism is separated from the base material production, allowing simple manufacturing of the base material followed by post-production color manipulation using magnetic fields, thereby reducing manufacturing complexity while maintaining high precision color patterns
Solution Approach 2:
The invention incorporates color-changing colloidal nanocrystals into the material during initial production, preparing the material in advance with the capability for later color manipulation. This preliminary embedding of functional particles allows the material to be manufactured simply, while the actual color patterning is deferred to a later stage using magnetic field control, reducing overall manufacturing complexity
2Productivity
If sublimation or multi-yarn weaving is used for intricate designs, then color details can be achieved, but labor costs and production time increase
Solution Approach 1:
The invention replaces mechanical manufacturing processes (weaving, sublimation) with a magnetic field-based control system. Instead of using complex mechanical operations to create color patterns, the patent uses magnetic fields to manipulate colloidal nanocrystals, substituting mechanical labor with electromagnetic control, thereby significantly reducing labor intensity and improving production efficiency
Solution Approach 2:
The invention changes the control parameter from mechanical process parameters (weaving patterns, sublimation temperature and time) to magnetic field parameters (strength, direction, distribution). This parameter change allows for more efficient control of color patterns, as magnetic fields can be precisely adjusted and applied rapidly without the constraints of mechanical processing speeds
3Manufacturing precision
If magnetic field strength is increased to adjust nanocrystal color, then color control precision improves, but energy consumption increases
Solution Approach 1:
The invention applies magnetic field strength that is sufficient but not excessive for color control. By using colloidal nanocrystals with appropriate magnetic susceptibility, the system achieves precise color control at moderate magnetic field levels, avoiding the energy waste that would result from applying excessively strong magnetic fields. The partial action principle is applied by using just enough magnetic field strength to achieve the desired color state
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 allows for the creation of intricate color patterns with high precision and scalability, reducing production complexity and labor costs, while enabling real-time customization of colors in articles like apparel and footwear.
Implementation Method 1
subjecting a liquid suspension of iron oxide colloidal nanocrystal clusters ('CNCs') to a magnetic field causes the CNCs to assemble into periodic arrays
Implementation Method 2
the highly charged polyacrylate covered surfaces and the strong magnetic responses of the magnetite CNCs
Implementation Method 3
form a photonic crystal, which diffracts light in the visible spectrum
Implementation Method 4
Photonic crystals are peculiar structures that show periodic variations in refractive index on a length scale comparable to the wavelength of light
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
Systems and methods of manipulating a color displayed by an article of wear comprising iron oxide colloidal nanocrystals arranged within chains are described. Steps may include forming the article of wear from a raw material that include the chains of nanocrystals, applying a magnetic field to the raw material, applying energy to at least some of the chains of nanocrystals to soften materials within the raw material immediately surrounding the chains of nanocrystals to which the energy is applied, adjusting a strength of the magnetic field to control the color displayed by the raw material, removing the energy to allow the materials within the raw material immediately surrounding the chains of nanocrystals to harden and fix a location of the nanocrystals within the chains, and removing the magnetic field.