MXene Porous Fiber Structure With Aligned Anisotropic Pores
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Solution Overview
Problem
Existing porous fibers face challenges in achieving highly anisotropic pores with controllable aligned structures, leading to limitations in performance such as cycle life, electrical conductivity, and mechanical properties, and they degrade when exposed to the environment and body movements, with additional protective layers complicating interfacial interactions.
Innovation Solution
A method involving thermal drawing and freeze-casting is used to form fibers with aligned structures by creating a tube, filling it with MXene sheets and nanomaterials, and freezing to define internal spaces, resulting in anisotropic porous fibers with controlled interlamellar spacings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If freeze-spinning is used to form oriented pores, then thermal insulation is enhanced, but the ability to achieve highly anisotropic pores with controllable aligned structures is limited
Solution Approach 1:
The patent applies parameter changes by controlling freezing temperature gradients and drawing speeds during the freeze-drawing process. By adjusting these parameters, the invention achieves highly anisotropic porous structures with controllable aligned pores, resolving the limitation of conventional freeze-spinning that could enhance thermal insulation but not achieve precise structural alignment.
Solution Approach 2:
The invention introduces dynamic elements by combining freeze-drawing with continuous fiber formation processes. The dynamic control of freezing conditions and mechanical drawing enables real-time adjustment of pore alignment and anisotropy, allowing simultaneous achievement of thermal insulation and manufacturing precision that static freeze-spinning cannot provide.
2Adaptability or versatility
If porous fibers are exposed to the environment and skin, then they can be used for health management and sensors, but their performance degrades due to environmental exposure and physical impact
Solution Approach 1:
The patent employs composite materials by combining porous fiber matrices with protective coating layers. This composite structure allows the inner porous fiber to maintain its functionality for health management and sensor applications while the outer protective layer shields it from environmental degradation and physical impact, simultaneously achieving adaptability and reliability.
Solution Approach 2:
The invention applies beforehand cushioning by pre-forming protective layers on the porous fibers before they are exposed to harsh environments. These protective coatings act as a buffer against environmental stressors and physical impacts, allowing the fibers to maintain their performance in applications like health management and sensors without degradation from prior exposure.
3Reliability
If a protective layer is formed on the outer surfaces of porous fibers, then durability is improved, but additional process steps create uncertainties in controlling interfacial interactions
Solution Approach 1:
The patent merges the fiber formation and protective layer deposition processes into a single integrated step. By combining these operations, the invention reduces the number of separate process steps and minimizes uncertainties in controlling interfacial interactions between the porous fiber and protective layer, while still achieving improved durability through the formation of a protective coating.
4Area of stationary object
If conventional porous fiber fabrication methods are used, then high specific surface area is achieved, but cycle life and electrical conductivity are limited by obstruction of transmission path
Solution Approach 1:
The patent applies local quality by creating anisotropic porous structures where the pore size, shape, and orientation are locally optimized along the fiber axis. This local optimization ensures that the transmission path for ions and electrons is not obstructed, maintaining high electrical conductivity and cycle life while preserving the high specific surface area needed for electrochemical performance.
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 method enables the fabrication of anisotropic porous fibers with aligned structures that can output high voltages for acoustic energy harvesting, demonstrating improved performance and durability.
Implementation Method 1
forming a tube using a thermal drawing process
Implementation Method 2
freezing the one or more mixtures within the tube using a freeze-casting process such that a first plurality of walls formed by MXene sheets and a second plurality of walls formed by nanomaterials
Data Source
AI summary
Various embodiments may relate to a method of forming a fiber. The method may include forming a tube using a thermal drawing process. The method may also include providing one or more mixtures into the tube. The method may further include freezing the one or more mixtures within the tube using a freeze-casting process such that a first plurality of walls formed by MXene sheets and a second plurality of walls formed by nanomaterials, the MXene sheets and the nanomaterials comprised in the one or more mixtures, define a plurality of spaces within the tube, thereby forming the fiber.