Liquid Crystal Elastomer Precursor Composition for Room-Temperature Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for preparing liquid crystal elastomers require high magnetic fields, lengthy temperature control cycles, and are inefficient for orienting liquid crystals in multiple layers, limiting their application in 4D printing.
Innovation Solution
A liquid crystal elastomer precursor solution material with photocurable reactive mesogen, EDDET, and 5CB, maintained at room temperature for quick orientation by a magnetic field, combined with a photopolymerization apparatus using a digital light projector and magnetic field generator for independent three-dimensional patterning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a strong magnetic field (100 mT to 500 mT) is used to align liquid crystal molecules, then the orientation speed and quality improve, but the device becomes bulky and generates high heat requiring additional cooling devices
Solution Approach 1:
The patent changes the key parameter from magnetic field strength to magnetic field susceptibility by selecting liquid crystal molecules with high magnetic susceptibility. This allows achieving the same orientation effect with a much weaker magnetic field (10 mT to 50 mT), eliminating the need for bulky Helmholtz coils and complex cooling systems while maintaining fast orientation speed
Solution Approach 2:
The patent replaces the mechanical/electrical system of generating strong magnetic fields with Helmholtz coils with a chemical/molecular approach by designing liquid crystal molecules with inherent high magnetic susceptibility. This substitution fundamentally reduces the complexity of the magnetic field generation device
2Reliability
If the material is heated to high temperature to enter nematic state and then cooled slowly, then liquid crystal orientation is achieved, but the preparation time becomes very long (1 hour or more)
Solution Approach 1:
The patent changes the temperature parameter from high temperature (requiring heating and slow cooling) to room temperature by utilizing the high magnetic susceptibility of the liquid crystal molecules. This allows the material to maintain nematic state and respond to magnetic field orientation at room temperature, dramatically reducing preparation time to a few seconds while maintaining orientation quality
Solution Approach 2:
The patent incorporates high magnetic susceptibility into the molecular structure of the liquid crystal material in advance (preliminarily), which enables the material to respond quickly to magnetic field orientation at room temperature without requiring preliminary heating and slow cooling processes
3Reliability
If conventional LCE preparation methods are used with heating and cooling cycles, then liquid crystal elastomer is formed, but the process is time-consuming and inefficient for multiple layers
Solution Approach 1:
The patent changes the temperature parameter from requiring heating and cooling cycles to operating at room temperature by utilizing high magnetic susceptibility liquid crystal molecules. This enables rapid LCE formation in a few seconds and allows efficient preparation of multiple layers by simply stacking transparent plates, dramatically improving productivity while maintaining LCE formation quality
Solution Approach 2:
The patent designs the liquid crystal material with high magnetic susceptibility in advance, which preliminarily enables the material to form LCE quickly at room temperature without time-consuming heating and cooling cycles, thereby improving overall preparation efficiency
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
Enables rapid orientation and patterning of liquid crystals at room temperature without heating, allowing for efficient preparation of LCEs with controlled orientation and reversible thermal transformation.
Implementation Method 1
liquid crystals can be oriented by a magnetic field within a few seconds at room temperature
Implementation Method 2
the method using the magnetic field has a great advantage in that contactless orientation from a distance is allowed
Implementation Method 3
a photopolymerization apparatus for preparing the LCE by applying magnetic field and light to the solution material
Data Source
AI summary
Disclosed are a liquid crystal elastomer precursor solution material and a photopolymerization apparatus for preparing a liquid crystal elastomer with the solution material, in which the liquid crystal elastomer precursor solution material includes photocurable reactive mesogen, EDDET (2,2′-(ethylenedioxy)diethanethiol), and 5CB (4-cyano-4-pentylbiphenyl).