Nanocarbon Dispersion Liquid Storage Stability
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Solution Overview
Problem
Nanocarbon dispersion liquids, particularly those containing single-walled carbon nanotubes, suffer from aggregation and turbidity issues when stored at room temperature, leading to nonuniformity and performance deterioration due to the interaction between nanocarbon materials and surfactants.
Innovation Solution
A method involving low-temperature storage at 10° C. or lower and surfactant concentration adjustment to be less than 100 times the critical micelle concentration, ensuring stability and preventing turbidity formation in nanocarbon dispersion liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If nanocarbon dispersion liquid is stored at room temperature, then storage convenience is improved, but aggregation and turbidity occur leading to nonuniformity
Solution Approach 1:
The patent changes the temperature parameter from room temperature to low temperature (10°C or lower) to prevent aggregation while maintaining dispersion uniformity. This parameter change resolves the contradiction by enabling stable storage without sacrificing too much convenience, as the low temperature storage can be implemented in standard refrigerators.
2Duration of action of stationary object
If nanocarbon dispersion liquid is stored at room temperature for long time, then storage duration is improved, but aggregation occurs leading to performance deterioration
Solution Approach 1:
The patent applies temperature parameter change (storing at 10°C or lower) to simultaneously achieve long storage duration and maintain reliability. The low temperature prevents the aggregation that would otherwise occur during long-term storage, thereby preserving the electrical characteristics of the nanocarbon materials.
Solution Approach 2:
The patent performs preliminary action by adjusting the surfactant concentration to an optimal range (1-100 times the critical micelle concentration) before storage. This preliminary adjustment ensures that the dispersion remains stable during long-term storage, preventing aggregation and maintaining electrical characteristics without requiring additional interventions later.
3Stability of the object's composition
If surfactant concentration is increased to prevent aggregation, then dispersion stability is improved, but turbidity formation occurs
Solution Approach 1:
The patent precisely controls the surfactant concentration parameter within a specific range (1-100 times the critical micelle concentration). This optimized parameter setting provides enough surfactant to stabilize the dispersion and prevent aggregation, while avoiding excess surfactant that would cause turbidity formation through micelle aggregation.
Solution Approach 2:
The patent uses surfactant as an intermediary substance to mediate between the nanocarbon particles and the dispersion medium. By optimizing the surfactant concentration, it achieves effective stabilization of the dispersion without the harmful side effect of turbidity, as the surfactant forms appropriate micellar structures that keep particles dispersed but transparent.
4Stability of the object's composition
If low temperature storage is implemented, then dispersion uniformity is improved, but storage complexity increases
Solution Approach 1:
The patent implements a modest temperature parameter change (to 10°C or lower) that can be achieved with standard refrigerator equipment. This level of temperature control improves dispersion uniformity significantly while adding minimal complexity to the storage system, as it does not require specialized cryogenic equipment or complex temperature control mechanisms.
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 allows for the stable storage of nanocarbon dispersion liquids for extended periods without turbidity, maintaining electrical conductivity and ensuring the long-term usability of nanocarbon materials in electronic applications.
Implementation Method 1
storing the nanocarbon dispersion liquid at 10° C. or lower
Implementation Method 2
adjusting a concentration of the surfactant in the nanocarbon dispersion liquid so as to be less than 100 times of a critical micelle concentration
Data Source
AI summary
Provided is a method for stably storing a nanocarbon dispersion liquid comprising a surfactant for a long period of time. One aspect of the present invention relates to a method for storing a nanocarbon dispersion liquid comprising a low-temperature storage step of storing the nanocarbon dispersion liquid at 10° C. or lower and/or a surfactant concentration adjustment step of adjusting a concentration of the surfactant in the nanocarbon dispersion liquid so as to be less than 100 times of a critical micelle concentration and equal to or more than the critical micelle concentration.