Cyclodextrin Surface Coating via Self-Assembling Multilayers
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Solution Overview
Problem
Current methods for coating solid materials with cyclodextrins are limited to mono- and bi-layers, which are insufficient for applications like the textile industry that require thicker layers for higher guest molecule loading, and often involve time-consuming chemical reactions and processes not suitable for large-scale production.
Innovation Solution
A method involving the physical adsorption of modified cyclodextrins with altered hydroxyl groups and solvents to form self-assembling multilayers on solid surfaces, bypassing the need for chemical reactions and enabling the creation of thicker cyclodextrin layers through the use of amphiphilic cyclodextrins in an adsorption solution with specific solvent compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If physical adsorption of modified cyclodextrins is used to form multilayers, then the thickness of the cyclodextrin layer is increased and guest molecule loading capacity is enhanced, but the process complexity increases due to the need for specific solvent compositions and amphiphilic modifications
Solution Approach 1:
The patent modifies the hydroxyl groups of cyclodextrins with aliphatic chains of specific lengths (C4, C6, C8) to create amphiphilic properties. This parameter change in the molecular structure enables the cyclodextrins to self-assemble into multilayers through physical adsorption when specific solvent compositions are used, resolving the contradiction between achieving thick layers and maintaining process simplicity
Solution Approach 2:
The modified cyclodextrins with amphiphilic properties automatically self-assemble into multilayers through physical adsorption without requiring chemical reactions or complex processing. The molecules self-organize based on their hydrophobic-hydrophilic balance, enabling thick layer formation while keeping the process simple and suitable for large-scale production
2Reliability
If covalent grafting methods are used to fix cyclodextrins onto solid materials, then the stability of the cyclodextrin coating is improved, but the manufacturing time increases due to time-consuming chemical reactions
Solution Approach 1:
The patent replaces chemical bonding mechanisms (covalent grafting) with physical adsorption mechanisms. The modified cyclodextrins adhere to solid surfaces through physical forces such as van der Waals interactions and hydrophobic effects, eliminating the need for time-consuming chemical reactions while maintaining coating stability through the self-assembling multilayer structure
Solution Approach 2:
The amphiphilic modified cyclodextrins act as intermediaries between the solid surface and the aqueous environment. The hydrophobic portions interact with the solid surface while the hydrophilic portions face the aqueous solution, creating stable physical adsorption without requiring covalent bonds, thus reducing manufacturing time while maintaining reliability
3Quantity of substance
If chemical cross-linking or reactive cyclodextrin derivatives are used to form polymer layers, then the cyclodextrin loading capacity is increased, but the ease of manufacture decreases due to requirements for chemical reactants and time-consuming processing
Solution Approach 1:
The modified cyclodextrins self-assemble into multilayers through physical adsorption without requiring chemical cross-linking agents or reactive derivatives. The amphiphilic properties enable automatic self-organization into thick layers with high cyclodextrin loading capacity, eliminating the need for complex chemical processing and making the method easy to manufacture on large scale
Solution Approach 2:
By modifying the hydroxyl groups with aliphatic chains and using specific solvent compositions, the patent changes the physical and chemical parameters of the cyclodextrin system to enable self-assembling multilayer formation. This achieves high loading capacity through physical rather than chemical means, significantly improving ease of manufacture
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 formation of stable, thicker cyclodextrin multilayers on solid materials, enhancing guest molecule loading capacity while avoiding the use of chemical reactants and facilitating large-scale production, with the adsorption solution's instability driving the formation of micelles or aggregates for optimal coating.
Implementation Method 1
The present invention relates to a method for functionalizing a solid material surface with self assembling cyclodextrins... The fixation of CD onto a solid material can be achieved in a number of ways. A fixation can range from weak van der Wall interactions to covalent grafting... Covalent grafting has attracted considerable attention, whereas the non-covalently grafting has attracted much less attention.
Implementation Method 2
A paper by Cristiano et al. (Langmuir 2007, 23, 8944-8949) discloses a method for the adsorption and spreading of β-cyclodextrin (β-CD) vesicles on hydrophobic and hydrophilic solid material surfaces, which involves a transition from bi-layer vesicles to planar molecular mono-layers or bi-layers.
Implementation Method 3
with the adsorption solution's instability driving the formation of micelles or aggregates for optimal coating
Implementation Method 4
The CD vesicles prefer to interact with hydrophobic and cationic solid material surfaces instead of hydrophilic, non-ionic solid material surfaces.
Data Source
AI summary
The present invention relates to a method for functionalizing a solid material surface with self assembling or self aggregating cyclodextrins, said method comprising the steps of: providing an adsorption solution comprising at least one modified cyclodextrins and at least one solvent; and contacting a solid material surface with the adsorption solution.