BNNT-Polymer Composite Electrospinning Alignment
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Solution Overview
Problem
Current methods for producing boron nitride nanotube (BNNT) dispersed polymeric piezoelectric composites face challenges in aligning BNNT without additional costly polarization processes, which restricts the improvement of piezoelectric properties due to the difficulty in aligning BNNT in a uniform direction and the high voltage required for electrical polarization.
Innovation Solution
The method involves dispersing BNNT in a polymeric solution and using electro spinning to align them in the same direction as micro- and/or nano fibers, eliminating the need for an additional alignment process and enhancing the piezoelectric properties by aligning BNNT within the polymer matrix during the electro spinning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional alignment process is used to align BNNT in uniform direction, then piezoelectric properties are improved, but production cost and process complexity increase
Solution Approach 1:
The patent combines the BNNT alignment function with the electrospinning process itself. The electric field applied during electrospinning naturally aligns BNNT along the fiber axis, eliminating the need for separate alignment equipment or processes. This merging of functions achieves uniform BNNT alignment while simplifying the overall production process.
Solution Approach 2:
The electrospinning process inherently provides the alignment function through its electric field. The high voltage applied during electrospinning causes BNNT to align automatically along the electric field lines and fiber direction, without requiring external alignment mechanisms. The process serves its own alignment needs through the physics of electrospinning.
2Manufacturing precision
If electrical polarization process is used to align BNNT, then piezoelectric properties are improved, but high voltage requirements and energy consumption increase
Solution Approach 1:
The patent performs alignment during the electrospinning process itself, before the material is fully formed. The electric field is applied concurrently with fiber formation, allowing BNNT to align as the fiber structure is being created. This preliminary alignment during formation eliminates the need for subsequent high-voltage polarization treatments.
Solution Approach 2:
The patent replaces the traditional electrical polarization mechanism with a mechanical/electrical field coupling mechanism inherent to electrospinning. Instead of applying high voltage to polarize already-formed material, the process uses the electrospinning electric field to mechanically align BNNT during fiber formation, reducing overall energy requirements.
3Stability of the object's composition
If conventional methods are used to disperse BNNT, then dispersion is achieved, but alignment in uniform direction is difficult
Solution Approach 1:
The electrospinning process acts as an intermediary mechanism that simultaneously achieves both dispersion and alignment. The electric field and fiber formation process work together to distribute BNNT uniformly while orienting them along the fiber axis. This intermediary process bridges the gap between simple dispersion and oriented alignment.
Solution Approach 2:
The patent changes the physical state and parameters of the system during processing. By controlling electrospinning parameters (voltage, flow rate, distance) and solution properties (viscosity, conductivity), the process transforms randomly dispersed BNNT into uniformly aligned structures within the fiber matrix through parameter optimization.
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 improves the piezoelectric properties of the composites by aligning BNNT uniformly, increasing the piezoelectric coefficient up to five times and making the composites flexible with high piezoelectric coefficients, while avoiding costly polarization processes.
Implementation Method 1
since the BNNT are aligned in the same direction with the micro- and/or nano fibers using electro spinning without an additional and costly aligning process for polarization
Implementation Method 2
BNNT are known to have piezoelectricity due to the different electric potential caused by the asymmetry of the crystal structure and structural defects, and by the external pressure or vibration applied to BNNT
Data Source
AI summary
Proposed is a method for producing a polymeric piezoelectric composite having boron nitride nanotubes (BNNT) dispersed therein, the method including: a solution-providing step for providing a polymeric solution; a dispersing step for dispersing BNNT in the polymeric solution; and an electro spinning step for electro spinning the polymeric solution with BNNT dispersed therein, thereby producing micro- and/or nano fibers based polymeric piezoelectric composites.