SWCNT Polyelectrolyte Liquid Crystals via Crown Ether Solubility
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Solution Overview
Problem
The limited solubility of single-walled carbon nanotube (SWCNT) polyelectrolytes prevents the formation of liquid crystalline phases, hindering the production of ordered macroscopic materials with superior mechanical and electrical properties.
Innovation Solution
The use of crown ethers to increase solubility by capturing counterions and promoting charge repulsion among SWCNTs, combined with high-speed mixing, allows for the formation of SWCNT polyelectrolyte solutions up to 52 mg/mL in a liquid crystalline phase, enabling the production of strong and conductive fibers and composites without the need for polymers or additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional solvents are used for SWCNT polyelectrolytes, then the solubility is limited, but the concentration cannot reach the level needed to form liquid crystalline phases
Solution Approach 1:
The patent changes the chemical parameter of the solvent system by introducing crown ethers (specifically 18-crown-6) as complexing agents. This chemical modification enables the formation of soluble complexes between crown ethers and alkali metal counterions, thereby increasing the solubility of SWCNT polyelectrolytes and enabling concentrations up to 52 mg/mL to be achieved, which is sufficient for liquid crystalline phase formation.
Solution Approach 2:
Crown ethers act as intermediary substances that mediate between the SWCNT polyelectrolytes and the solvent system. The crown ethers complex with alkali metal counterions, creating soluble intermediates that facilitate the dissolution of SWCNT polyelectrolytes at high concentrations without requiring extreme conditions or complex processing.
2Stability of the object's composition
If high concentration is achieved to form liquid crystalline phase, then ordered macroscopic materials can be produced, but the solubility limitation prevents reaching such concentrations
Solution Approach 1:
The patent modifies the chemical environment by adding crown ethers, which changes the solubility parameters of the system. This parameter change enables the formation of liquid crystalline phases at concentrations up to 52 mg/mL by creating stable soluble complexes that prevent precipitation and maintain phase stability at high concentrations.
Solution Approach 2:
The patent creates a composite solvent system comprising multiple components: crown ethers, alkali metals, polyaromatic compounds, and aprotic solvents. This composite system works synergistically to achieve both high solubility and liquid crystalline phase formation, with each component contributing specific functions to the overall system performance.
3Ease of manufacture
If simple mixing is used, then the process is simple, but the solubility and liquid crystalline phase formation are prevented
Solution Approach 1:
The patent incorporates preliminary actions in the form of pre-synthesis steps where SWCNT polyelectrolytes are first prepared with alkali metal functional groups, then dried under vacuum. These preliminary preparations create the necessary conditions for subsequent liquid crystalline phase formation upon addition of crown ethers and aprotic solvents, ensuring phase stability without complex processing during the main manufacturing step.
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 method results in SWCNT fibers with tensile strength of 124 MPa and Young's modulus of 14 GPa, and conductive composites with improved mechanical and electrical properties, surpassing previous methods in terms of fiber quality and production simplicity.
Implementation Method 1
The use of crown ethers to increase solubility by capturing counterions and promoting charge repulsion among SWCNTs
Implementation Method 2
mixing the single-walled carbon nanotube polyelectrolytes with a polar aprotic solvent to form a mixture, where the mixing results in the formation of single-walled carbon nanotubes in the liquid crystalline phase
Implementation Method 3
The formation of a liquid crystalline single-walled carbon nanotube phase is preferred in order to manufacture single-walled carbon nanotube polyelectrolytes into ordered macroscopic materials
Implementation Method 4
coagulating the mixture to form the single-walled carbon nanotube fibers
Data Source
AI summary
In some embodiments, the present disclosure pertains to methods of forming a solution of single-walled carbon nanotube polyelectrolytes in a liquid crystalline phase. In some embodiments, such methods comprise: (a) providing single-walled carbon nanotube polyelectrolytes; and (b) mixing the single-walled polyelectrolytes with a polar aprotic solvent to form a mixture, where the mixing results in the formation of single-walled carbon nanotubes in the liquid crystalline phase. In some embodiments, the polar aprotic solvent comprises crown ether. In some embodiments, the present disclosure pertains to a method of making single-walled carbon nanotube fibers. Further embodiments of the present disclosure pertain to a method of making a single walled carbon nanotube composite. In some embodiments, the present disclosure pertains to an article comprising neat aligned carbon nanotubes.