Crosslinked Colloidal Cellulose Nanocrystals for Moisture Stability
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Solution Overview
Problem
Cellulose nanocrystals (CNCs) self-assemble into structures that collapse in moist environments due to their hydroxyl-rich surface, limiting their use to dry media and restricting their practical applications in various environments.
Innovation Solution
Covalently crosslinking colloidal CNCs using dialdehyde or epoxide-based crosslinkers to form stable networks that maintain structural integrity in aqueous environments, allowing for tunable surface chemistry and enhanced physicochemical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If CNCs self-assemble into structures using hydrogen bonds, then they form organized networks with uniform packing, but they collapse in moist environments due to hydroxyl-rich surface
Solution Approach 1:
The patent changes the chemical parameters of CNC surfaces by introducing crosslinks through covalent bonding. Crosslinking agents modify the hydroxyl-rich surface chemistry, creating a more stable network that resists collapse in moist environments while preserving the self-assembled structure.
Solution Approach 2:
The patent creates composite structures by combining CNCs with crosslinking agents to form a crosslinked hydrogel network. This composite material integrates the self-assembly properties of CNCs with the stabilizing effect of covalent crosslinks, achieving both structural organization and moisture resistance.
2Reliability
If CNCs are used in dry media, then they maintain structural integrity, but their applications are limited to dry environments
Solution Approach 1:
The patent modifies the environmental adaptability of CNCs by changing their surface chemistry through crosslinking. This parameter change enables the material to maintain structural integrity not only in dry media but also in aqueous and humid environments, significantly expanding its applicability.
Solution Approach 2:
The crosslinked CNC structure achieves universality by being applicable in multiple environmental conditions (dry and wet). The covalent crosslinks provide a stabilizing framework that allows the same material to function reliably across different media types, making it versatile for various applications.
3Reliability
If crosslinking agents are used to stabilize CNC structures, then water stability is improved, but the surface chemistry becomes more complex
Solution Approach 1:
The patent manages surface chemistry complexity by using crosslinking agents that form covalent bonds with specific hydroxyl groups on CNC surfaces. This targeted chemical modification provides water stability while the crosslinking network structure organizes the complexity into a manageable framework.
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 covalent crosslinking of CNCs results in water-stable structures with improved mechanical and physicochemical properties, enabling their use in both dry and wet environments and expanding their applications in various industries.
Implementation Method 1
covalently crosslinking colloidal CNCs using dialdehyde or epoxide-based crosslinkers to form stable networks
Implementation Method 2
CNCs phase behavior and liquid crystal state are inclined to the formation of gel-like materials, which are held together by hydrogen (H) bonds to self-assemble into a structure
Data Source
AI summary
This invention relates generally to covalently crosslinked colloidal cellulose nanocrystals (xCNC) and methods of preparation and use thereof. The colloidal cellulose nanocrystals (CNCs) are covalently crosslinked in aqueous suspension to generate a network showing tunable physicochemical properties. The xCNC structures are tunable in terms of their physicochemical properties and arrangement within the hydrogel network. The covalent crosslinking of solitary sulfonated (—OSO3) CNCs can be accomplished without prior hydroxyl replacement or functionalization.