A Parameter Study for 3D-Printing Organized Nanofibrous Collagen Scaffolds Using Direct-Write Electrospinning
Frank A Alexander1, Lee Johnson2, Krystaufeux Williams3
1The Geneva Foundation, Tacoma, WA 98402, USA.
Materials (Basel, Switzerland)
|December 15, 2019
Summary
Researchers optimized direct-write electrospinning for pure collagen scaffolds, crucial for tissue engineering. This method creates ordered fibrous structures mimicking natural tissues, enhancing cellular behavior studies and potential regenerative medicine applications.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Additive Manufacturing
Background:
- Collagen scaffolds are vital for tissue engineering but often lack the structural rigidity and organization of native tissues.
- Existing collagen scaffolds, like hydrogels and biopapers, present limitations in mimicking complex organ structures such as the cornea and meniscus.
- Direct-write electrospinning offers a promising additive manufacturing approach for creating highly ordered fibrous scaffolds.
Purpose of the Study:
- To optimize direct-write electrospinning parameters for pure collagen fabrication.
- To establish a method for producing organized collagenous scaffolds for tissue engineering applications.
- To investigate the relationship between process parameters and scaffold morphology and mechanical properties.
Main Methods:
- A custom 3D electrospinning printer was developed and utilized.
- Key parameters including voltage, relative humidity, and acetic acid concentration were systematically varied.
- Real-time monitoring of relative humidity and electrospinning current was employed.
- A novel 'spin quality ratio' (SQR) was defined to analyze fiber orientation.
- Tensile testing was conducted on the fabricated scaffolds.
Main Results:
- Optimal direct-write electrospinning parameters for pure collagen were identified.
- The study established a correlation between process parameters, fiber morphology, and orientation.
- The developed 'spin quality ratio' (SQR) effectively quantified fiber alignment.
- Preliminary tensile tests demonstrated the mechanical potential of the electrospun collagen mats.
Conclusions:
- Direct-write electrospinning is a viable technique for fabricating highly ordered pure collagen scaffolds.
- Optimization of electrospinning parameters is critical for achieving desired scaffold properties.
- The developed methodology and SQR parameter provide a foundation for future advancements in collagen-based tissue engineering scaffolds.
