Colloidal Crystal Production via Ionic Surfactant Temperature Control
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Solution Overview
Problem
The existing method for producing colloidal crystals using a silica colloidal dispersion system with pyridine, where the surface charge of colloidal particles is controlled based on temperature-dependent dissociation, has limitations in controllability and requires strict conditions, making it difficult to handle various types of colloidal particles effectively.
Innovation Solution
A method involving the use of ionic surfactants in a colloidal dispersion system, where the number of surface charges on colloidal particles is controlled through temperature changes, allowing for the formation and melting of colloidal crystals by adjusting the phase transition temperature based on the type and concentration of the surfactant, enabling the production of colloidal crystals with a wide range of particle types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pyridine is added to control surface charge based on temperature-dependent dissociation, then colloidal crystal formation is achieved, but controllability is limited and strict conditions are required
Solution Approach 1:
The patent changes the controlling parameter from pH-dependent dissociation (pyridine) to temperature-dependent solubility (ionic surfactant). By using ionic surfactants whose solubility and micelle formation temperature can be adjusted through concentration and type selection, the method achieves reliable colloidal crystal formation while being adaptable to various colloidal particle types without strict condition requirements.
Solution Approach 2:
The patent introduces ionic surfactants as intermediaries that mediate between temperature control and colloidal crystal formation. The ionic surfactants act as a flexible intermediary whose micelle formation temperature can be tuned to match different colloidal systems, enabling broad applicability while maintaining reliable crystal formation through the intermediary's phase transition behavior.
2Reliability
If pyridine-based temperature-dependent dissociation is used, then colloidal crystal production is achieved, but production conditions require strict setting for good reproducibility
Solution Approach 1:
The patent simplifies production conditions by changing from pH control (requiring strict water purity and base purity settings) to temperature control through ionic surfactant micelle formation. Temperature is a more forgiving parameter that can be controlled with standard equipment, reducing the complexity of production conditions while maintaining reproducible colloidal crystal formation.
3Temperature
If ionic surfactant concentration and type are adjusted, then phase transition temperature is controlled, but system complexity increases
Solution Approach 1:
The patent uses ionic surfactant concentration and type as adjustable parameters to control micelle formation temperature, which in turn controls colloidal crystal phase transition temperature. This approach provides precise temperature control capability while keeping the system relatively simple, as ionic surfactants are commercially available in various types and concentrations can be easily adjusted without requiring complex equipment or procedures.
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 approach allows for precise control over colloidal crystal production, enabling the formation of large single crystals with fewer lattice defects and unevenness, and can be applied to various types of colloidal particles, improving reproducibility and flexibility in crystal formation.
Implementation Method 1
In a colloidal dispersion system to which an ionic surfactant was added, a colloidal crystal was formed by cooling and conversely the colloidal crystal was melted by heating
Implementation Method 2
the phase transition temperature of crystallization/melting of a colloidal crystal was changed depending on types and concentrations of ionic surfactant
Implementation Method 3
a colloidal crystal was formed by cooling and conversely the colloidal crystal was melted by heating
Data Source
AI summary
[Problem] To provide a method for producing a colloidal crystal, wherein the method is easily controlled and is capable of dealing with a wide range of types of colloidal particle.[Solution] The method for producing a colloidal crystal in the present invention is characterized by comprising a preparation step of preparing a colloidal dispersion liquid, in which colloidal particles are dispersed in a liquid comprising an ionic surfactant and a colloidal crystal can be formed due to temperature changes, and a crystallization step of formation of a colloidal crystal by changing the temperature of the colloidal dispersion liquid from a temperature region in which the colloidal crystal is not formed to a temperature region in which the colloidal crystal is formed.