Template-Free Nanofiber Synthesis via 2D Material Self-Assembly
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Solution Overview
Problem
The challenge lies in the controllable fabrication of high aspect ratio and high-quality graphene fibers without the need for templates or harsh conditions, as existing methods often result in lower aspect ratio and diameter nanofibers, limiting their applications in fields like filtration, electronics, and medicine.
Innovation Solution
The method involves functionalizing 2D materials with charge-bearing moieties that allow for self-assembly and cross-linking in aqueous media at mild conditions, enabling the formation of long nanofibers through short- and long-range interactions, such as covalent and hydrogen bonding, without the use of templates or catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If template methods are used to produce graphene fibers, then the fiber formation is guided and controlled, but the aspect ratio and quality of the fibers are limited
Solution Approach 1:
The patent removes the template component from the fiber formation system, achieving template-free synthesis of graphene fibers through direct self-assembly of 2D materials. This extraction of the template element enables higher aspect ratios while simplifying the overall process architecture.
Solution Approach 2:
The 2D materials undergo self-assembly and self-organization to form nanofibers without external templates or catalysts. The charge-bearing moieties on 2D materials drive their own aggregation and fiber formation through electrostatic interactions, eliminating the need for template structures.
2Ease of manufacture
If harsh conditions are used in fiber fabrication, then the fiber formation is achieved, but the pristine properties of 2D materials are compromised
Solution Approach 1:
The patent changes the fabrication parameters from harsh conditions (high temperature, strong chemicals) to mild conditions (aqueous media, room temperature or mild heating). The charge-bearing moieties enable fiber formation through electrostatic interactions that occur under these gentle conditions, preserving 2D material integrity.
Solution Approach 2:
Charge-bearing moieties act as intermediaries that mediate the interaction between 2D materials and the formation of fibers. These functional groups enable self-assembly through electrostatic forces without requiring harsh environmental conditions, thus protecting the pristine properties of the underlying 2D materials.
3Manufacturing precision
If conventional methods are used to produce nanofibers, then the process is established, but the aspect ratio and diameter control are insufficient
Solution Approach 1:
The patent employs feedback mechanisms where the charge-bearing moieties on 2D materials continuously interact with surrounding 2D materials through electrostatic forces. This feedback-driven self-assembly process enables precise control over fiber diameter and aspect ratio while maintaining scalability through simple mixing 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 results in ultralong nanofibers with high aspect ratios and controlled growth, suitable for various applications including filtration, electronics, and biomedical uses, while maintaining the pristine properties of the 2D materials and allowing for scalable production.
Implementation Method 1
nanofiber assembly can be governed by short- and long-range interactions, such as covalent and hydrogen bonding
Implementation Method 2
nanofiber assembly can be governed by short- and long-range interactions, such as covalent and hydrogen bonding
Implementation Method 3
2D-electrolytes, that are 2D materials with ionic groups attached to their surface that can deprotonate in a liquid medium, can undergo morphological transition, in a similar way to polyelectrolytes, followed by self assembly and cross linking
Implementation Method 4
2D-confined electrolytes, which are 2D materials with organic/inorganic salt on its basal plane and the presence of using another organic/inorganic salt results in ion-exchanging and destabilization of the system, causing phase separation/coagulation into fibers
Implementation Method 5
causing phase separation/coagulation into fibers
Implementation Method 6
reacting the charge bearing moieties on the planar surfaces with proton donors, proton acceptors, at least partially hydrophobic counterions or a second 2D materials with oppositely charge bearing moieties
Data Source
AI summary
The present disclosure concerns nanofibers and methods of forming these nanofibers thereof. The method of forming nanofiber comprises providing 2D materials with charge bearing moieties on its planar surfaces and at its ends, reacting the charge bearing moieties on the planar surfaces with proton donors, proton acceptors, at least partially hydrophobic counterions or a second 2D materials with oppositely charge bearing moieties on its planar surfaces and at its ends in order to curl the 2D material, simultaneously reacting the charge bearing moieties at the ends with proton donors, proton acceptors, at least partially hydrophobic counterions or the second 2D materials with oppositely charge bearing moieties on its planar surfaces and at its ends, and crosslinking the neutralised charge bearing moieties at the ends in order for the 2D materials to interact with each other to form the nanofiber.