Amphiphilic Nanosheet Preparation via Deep Eutectic Solvent
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Solution Overview
Problem
Current methods for preparing amphiphilic nanosheets face challenges such as incomplete separation of hydrophobic and hydrophilic chains, aggregation issues, and complex, difficult-to-control processes, making large-scale industrial production impractical.
Innovation Solution
A method involving the use of a choline chloride-urea based deep eutectic solvent for interfacial polymerization with styrene and divinylbenzene, where the addition of azobisisobutyronitrile and cetyltrimethylammonium chloride allows for the formation of amphiphilic nanosheets with distinct hydrophilic and hydrophobic partitions, avoiding the need for pre-formed block polymers and simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If cross-linking amphiphilic block polymers is used to prepare nanosheets, then nanosheet structure is formed, but hydrophobic and hydrophilic chains cannot completely separate, resulting in non-distinct partition
Solution Approach 1:
The invention segments the amphiphilic polymer into distinct hydrophobic and hydrophilic blocks with clear spatial separation. The hydrophobic block forms the core while the hydrophilic block forms the shell, achieving complete separation of chains and distinct partition, resolving the issue of mixed partitions in conventional cross-linking methods.
Solution Approach 2:
The invention applies local quality by creating a core-shell structure where the core region has hydrophobic properties and the shell region has hydrophilic properties. This localized differentiation ensures distinct partition while maintaining the nanosheet overall structure, addressing the composition stability issue.
2Manufacturing precision
If conventional preparation methods are used, then nanosheets can be prepared, but the process is complicated requiring precise control of multiple steps
Solution Approach 1:
The invention merges multiple preparation steps into a single one-step process. By combining block polymer synthesis, dehydration, and cross-linking into one operation using choline chloride-urea deep eutectic solvent, it simplifies the preparation process while maintaining precise product control, resolving the complexity issue.
Solution Approach 2:
The invention changes the chemical parameters by using choline chloride-urea deep eutectic solvent as the reaction medium, which enables one-step preparation. This parameter change simplifies the process while maintaining manufacturing precision through controlled reaction conditions (temperature, time, solvent ratio).
3Ease of manufacture
If hydrophilic and hydrophobic parts are not distinct, then preparation is simplified, but aggregation occurs which is disadvantageous for application
Solution Approach 1:
The invention inverts the conventional approach by ensuring distinct partition rather than allowing mixed partition. The core-shell structure with clear hydrophobic-hydrophilic separation prevents aggregation while maintaining ease of manufacture through the simplified one-step process, resolving the reliability issue.
4Shape
If template method is used to prepare nanosheets, then nanosheet morphology is achieved, but yield is seriously influenced and industrial production is unfavorable
Solution Approach 1:
The invention applies self-service by using the choline chloride-urea deep eutectic solvent system that automatically forms the nanosheet structure during the one-step reaction. The system self-organizes the block polymers into core-shell nanosheets without requiring external templates, achieving both morphology control and high yield, resolving the productivity issue.
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 achieves high yield and easy mass production of amphiphilic nanosheets with distinct partitions, reducing aggregation and simplifying the preparation process, while maintaining a high aspect ratio and flexibility.
Implementation Method 1
interfacial polymerization with styrene and divinylbenzene
Implementation Method 2
choline chloride-urea based deep eutectic solvent
Implementation Method 3
addition of azobisisobutyronitrile and cetyltrimethylammonium chloride allows for the formation of amphiphilic nanosheets
Implementation Method 4
addition of azobisisobutyronitrile and cetyltrimethylammonium chloride allows for the formation of amphiphilic nanosheets
Implementation Method 5
crushing (such as ultrasonic crushing) and centrifuging the product to obtain the amphiphilic nanosheet
Implementation Method 6
crushing (such as ultrasonic crushing) and centrifuging the product to obtain the amphiphilic nanosheet
Data Source
AI summary
The present invention discloses a preparation method for an amphiphilic nanosheet. The preparation method comprises the following steps: mixing choline chloride and urea, and heating to prepare a choline chloride-urea based deep eutectic solvent; adding styrene, divinylbenzene and azobisisobutyronitrile into a higher alkane solvent, stirring and dissolving to obtain an oil phase solvent, wherein an addition amount of the divinylbenzene is greater than 5% by mass of a styrene monomer; and adding a hydrophilic monomer, cetyltrimethylammonium chloride and the oil phase solvent into the deep eutectic solvent, stirring and mixing, ventilating and deoxidizing, then heating to 70° C., reacting for at least 6 h, and then crushing and centrifuging to obtain the amphiphilic nanosheet. According to the present invention, a block polymer does not need to be prepared in advance, and a hydrophobic monomer and a hydrophilic monomer are physically isolated, so that the prepared amphiphilic nanosheet has a distinct partition and is not easy to agglomeration. The method is similar to conventional emulsion polymerization, the amphiphilic nanosheet is prepared by a one-step method, and the preparation process is simple; and the method has high product yield and is easy for mass production.