Bicontinuous Microdomain Composition for Thermo-Reversible Light Control
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Solution Overview
Problem
Current techniques for forming bicontinuous structures face challenges in achieving reversibility, reproducibility, scalability, and tunability, particularly in Bijel systems, and existing smart windows and structural color technologies lack dynamic tunability and efficient light management.
Innovation Solution
A colloidal composition forming a solvent segregation driven gel (SeedGel) with nanoparticles dispersed in a binary solvent system, where particles are jammed in one solvent domain due to preferential wetting, allowing thermo-reversible transitions between liquid and gel states, enabling adjustable gelation temperature and domain size, and controlling light transmission and scattering through refractive index matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Bijel systems are used to form bicontinuous structures, then porous materials with tortuous channels can be formed, but fast quenching rate is required which restricts scalability and thermal reproducibility
Solution Approach 1:
The invention changes the temperature parameter profile from fast quenching to slow cooling, enabling the formation of bicontinuous structures without requiring rapid temperature changes. This parameter modification resolves the contradiction by allowing sufficient time for structure formation while maintaining scalability and reproducibility.
Solution Approach 2:
The invention introduces dynamic control over the gelation process by adjusting cooling rates and temperature profiles. This dynamic approach allows optimization of both structure formation quality and processing scalability, resolving the contradiction between precision and productivity.
2Adaptability or versatility
If light absorption materials are used in smart windows, then certain wavelength of light can be selected or filtered, but toxic material is involved and photo-degradation occurs
Solution Approach 1:
The invention uses structural color generation through controlled light scattering by bicontinuous structures instead of light absorption by pigments. This approach provides wavelength selection capability without requiring toxic materials, and the structural color is inherently resistant to photo-degradation since it relies on physical structure rather than chemical chromophores.
Solution Approach 2:
The invention replaces the chemical mechanism of light absorption with a physical mechanism of light scattering. By substituting the chemical field with a physical optical field interaction, the harmful effects of toxicity and photo-degradation are eliminated while maintaining light wavelength selection capability.
3Illumination intensity
If structural color is achieved with photonic crystalline structures, then angle-dependent colors can be produced, but angle-independent structural color is difficult to achieve
Solution Approach 1:
The invention creates asymmetric bicontinuous structures with specific morphology control that enables angle-independent structural color. By designing the internal structure asymmetry and phase separation characteristics, the optical response becomes uniform across different viewing angles, resolving the contradiction between structural color intensity and angle-independence.
4Illumination intensity
If traditional smart window technologies are used, then light transmission control is achieved, but dynamic tunability is limited
Solution Approach 1:
The invention introduces dynamic tunability by enabling temperature-responsive changes in the bicontinuous structure morphology. The system can reversibly transition between different structural states in response to temperature changes, providing dynamic control over light transmission and scattering properties, thus resolving the contradiction between transmission control and tunability.
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 SeedGel embodiment achieves reversible, scalable, and tunable bicontinuous structures with dynamic optical modulation, providing efficient light and heat management without energy input, suitable for smart windows, filters, and temperature sensing.
Implementation Method 1
particles are jammed in one solvent domain due to preferential wetting
Implementation Method 2
the binary solvent system undergoes liquid-liquid phase separation to form a gel state with bicontinuous domains
Implementation Method 3
controlling light transmission and scattering through refractive index matching
Implementation Method 4
refractive index matching
Implementation Method 5
allowing thermo-reversible transitions between liquid and gel states
Data Source
AI summary
A dynamically tunable composition, a device including the composition, a method of dynamically tuning radiation transmission through the composition, and a method of thermo-reversibly controlling operation of a filter formed from the composition. The composition includes a plurality of nanoparticles dispersed in a single phase region of a binary solvent systems composed of a first solvent and a second solvent, the nanoparticles having a preferential wettability to the first solvent. Changing temperature of the composition causes it to transition thermo-reversibly from the liquid state to a gel state having bi-continuous domains, including a particle domain and a solvent domain. The particle domain features nanoparticles dispersed in a first-solvent-rich fraction of the binary solvent system, and the solvent domain is a second-solvent-rich fraction of the binary solvent system. Exemplary devices incorporating the composition include a filter, a temperature sensor, a smart window, a smart display, a battery, and a tissue growth scaffold.