Composite Inorganic Polymer Nanofibers Scalable Production
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Solution Overview
Problem
Current methods for producing nanofibers are limited by low production rates and inability to create nanofibers from non-melt-processable polymers, particularly biocompatible and biodegradable ones, and lack a scalable method for producing composite inorganic/organic nanofibers.
Innovation Solution
A method involving the introduction of a polymer solution or mixture with inorganic precursors into a dispersion medium, where shear stress is applied to form elongated fibers, including inorganic fibrils, which can be isolated through calcination or chemical treatment, enabling the production of pure inorganic fibrils and composite nanofibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrospinning is used to produce nanofibers, then fiber diameter can be reduced to sub-micron range, but production rate remains low
Solution Approach 1:
The invention segments the fiber production process by using a multi-component spinnable solution containing polymer, inorganic precursor, and solvent that can be extruded through a multi-hole spinneret. This allows simultaneous production of multiple nanofibers in parallel, dramatically increasing production rate while maintaining sub-micron fiber diameter through controlled extrusion and phase separation
Solution Approach 2:
The invention changes the physical and chemical parameters of the spinnable solution, including polymer concentration (1-20 wt%), inorganic precursor concentration (0.1-10 wt%), solvent type, and molecular weight of polymer (10,000-1,000,000 g/mol). These parameter adjustments enable optimization of both fiber diameter control and production rate by tuning solution viscosity, phase separation kinetics, and extrusion characteristics
2Productivity
If melt blowing or bicomponent spinning is used, then high-volume production is achieved, but only melt-processable polymers can be processed
Solution Approach 1:
The invention changes the processing state from melt to solution phase, enabling processing of polymers that are not melt-processable (such as biocompatible and biodegradable polymers). The spinnable solution contains polymer dissolved in solvent at concentrations of 1-20 wt%, allowing these sensitive polymers to be processed without thermal degradation while achieving high-volume production through scalable extrusion
Solution Approach 2:
The invention introduces a solvent as an intermediary medium that dissolves the polymer and inorganic precursor to form a spinnable solution. This solvent-mediated approach allows polymers that cannot be melted to be processed, as the solvent enables solution spinning while maintaining polymer integrity. The solvent is later removed through evaporation or extraction, leaving the desired nanofiber structure
3Ease of manufacture
If conventional methods are used to create composite nanofibers, then separate organic and inorganic materials must be processed separately, but integrated composite production is desired
Solution Approach 1:
The invention merges the processing of organic polymer and inorganic precursor materials into a single integrated spinnable solution and extrusion process. Both components are dissolved or dispersed together in the same solvent system, allowing simultaneous formation of composite nanofibers with both organic and inorganic phases distributed throughout the fiber structure in a single manufacturing step
Solution Approach 2:
The invention adjusts the chemical parameters of the spinnable solution, including polymer concentration (1-20 wt%), inorganic precursor concentration (0.1-10 wt%), solvent type, and molecular weight of polymer (10,000-1,000,000 g/mol). These parameter adjustments enable optimization of both fiber diameter control and production rate by tuning solution viscosity, phase separation kinetics, and extrusion characteristics
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 allows for the scalable production of nanofibers with high aspect ratios and the creation of composite inorganic/polymer nanofibers, overcoming the limitations of existing techniques by increasing productivity and enabling the use of a wide variety of polymers and inorganic materials.
Implementation Method 1
shearing the polymer solution. Dispersed-phase components of the polymer solution, such as, for example liquid streaks, strands or droplets, of the polymer solution are spun into elongated fibers
Implementation Method 2
introducing a polymer solution into a dispersion medium and shearing the polymer solution. Dispersed-phase components of the polymer solution... are spun into elongated fibers that are insoluble in the dispersion medium
Implementation Method 3
The inorganic fibrils may be liberated from the polymer matrix by, for example, treating the elongated fibers that include the inorganic fibrils to a calcination, chemical treatment, or energy addition process
Data Source
AI summary
Nanofibers are fabricated by introducing a mixture of a polymer solution and inorganic precursor into a dispersion medium and shearing the mixture. Liquid strands, streaks or droplets of the mixture are spun into elongated fibers that include inorganic fibrils. The resulting composite inorganic/polymer fibers may be provided as an end product. Alternatively, the polymer may be removed to liberate the inorganic fibrils, which may be of the same or smaller cross-section as the polymer fibers and may be provided as an end product.