Alpha-glucan Two-Phase Separation of Semiconducting Carbon Nanotubes
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Solution Overview
Problem
Conventional methods for separating semiconducting carbon nanotubes from mixtures with metallic carbon nanotubes are limited by low productivity, high costs due to the use of expensive dextran, and poor reusability of separation solutions over time, leading to inconsistent performance.
Innovation Solution
A method utilizing α-glucan with specific molecular weight and linkage ratios for two-phase separation, combined with surfactants, to efficiently separate semiconducting carbon nanotubes at lower costs and maintain performance consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dextran is used for two-phase separation to isolate semiconducting carbon nanotubes, then separation performance is achieved, but production cost increases due to expensive material
Solution Approach 1:
The patent replaces expensive dextran with cheaper alternative polymers (polysucrose, pullulan, or cyclodextrin) that can be used for the separation process. These alternative materials maintain the necessary separation functionality while significantly reducing material costs, directly addressing the contradiction between separation performance and production cost.
Solution Approach 2:
The patent modifies the chemical composition parameters of the separation system by substituting dextran with other polymers having different molecular structures and properties. This parameter change allows achieving similar separation performance through alternative materials with lower cost, resolving the contradiction between reliability and ease of manufacture.
2Reliability
If conventional separation methods are used, then semiconducting carbon nanotubes can be isolated, but productivity remains low due to batch processing limitations
Solution Approach 1:
The patent creates a universal separation system using alternative polymers that can handle large volumes of carbon nanotube mixtures. The two-phase separation method using these polymers can process bulk materials efficiently, enabling the system to serve both small-scale research applications and large-scale industrial production, thus improving productivity while maintaining isolation capability.
3Ease of manufacture
If separation solutions are reused over time, then cost efficiency improves, but performance becomes inconsistent due to solution degradation
Solution Approach 1:
The patent employs cheaper alternative polymers that can tolerate multiple reuse cycles without significant performance degradation. The lower cost of these materials allows for economical replacement when performance does decline, maintaining a balance between cost efficiency and performance consistency through controlled reuse and periodic replacement.
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 method achieves semiconducting carbon nanotube separation performance equivalent to or higher than traditional methods, while reducing costs and enhancing the reusability of the separation solution, ensuring consistent results over time.
Implementation Method 1
the mixture is separated through centrifugation into a PEG upper layer and a DX lower layer
Implementation Method 2
the dispersion is separated through centrifugation into a PEG upper layer and a DX lower layer
Data Source
AI summary
Producing a semiconductor device having a semiconductor layer containing semiconducting carbon nanotube produced through a method including: mixing a first substance, a second substance which undergoes two-phase separation when mixed with the first substance in solution, an alkyl chain-containing surfactant, a steroidal surfactant, and a mixture of metallic and semiconducting carbon nanotubes with a solvent, to prepare a dispersion; and separating the dispersion into a first layer mainly containing the first substance and a second layer mainly containing the second substance, whereby the semiconducting carbon nanotube is transferred into one of the first and second layers, and the metallic carbon nanotube is transferred into the other layer; and the first substance is an α-glucan composed of glucose linked via α-glucosidic linkage and having a weight average molecular weight of 4,000 to 7,000 and a ratio of α-1, 6 linked glucose residues to the entire glucose residues of 40 to 70%.