Process control of electrospinning artificial fenestrated capillary vessels

Qavi, Imtiaz; Tan, George Z.

doi:10.1016/j.matdes.2023.111708

Cited by 3 publications

(2 citation statements)

References 81 publications

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“…Despite the miscibility between core and shell solutions and the high solubility of rhodamine B in EtOH, a sharp boundary between the core and shell part is consistently observed during coelectrospinning, indicating that the time scale of polymer/dye diffusion is much longer than the jet formation. Our results agree with the prior coaxial electrospinning studies that suggested that a miscible core–shell solution pair is essential for reducing the interfacial tension and allowing the shell solution to form a continuous sheath around the core. , The substantially different rheological properties of core and sheath solutions can prevent solution mixing, resulting in compound fibers with distinct core–shell interfaces …”

Section: Resultssupporting

confidence: 90%

“…Our results agree with the prior coaxial electrospinning studies that suggested that a miscible core−shell solution pair is essential for reducing the interfacial tension and allowing the shell solution to form a continuous sheath around the core. 42,43 The substantially different rheological properties of core and sheath solutions can prevent solution mixing, resulting in compound fibers with distinct core−shell interfaces. 44 When these two solutions are electrospun using a single nozzle setup, the dilute TiP sol (with a low viscosity of 9.2 mPa s) initially undergoes electrospraying and forms droplets on the collector surface, which then quickly is at the nozzle tip and ceases the process, therefore, nonspinnable (Figure 1d and Movie S2 (Supporting Information)).…”

Section: Resultsmentioning

confidence: 99%

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Electrospinning Nonspinnable Sols to Ceramic Fibers and Springs

Dong,

Maciejewska,

Schofield

et al. 2024

ACS Nano

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Electrospinning has been applied to produce ceramic fibers using sol gel-based spinning solutions consisting of ceramic precursors, a solvent, and a polymer to control the viscosity of the solution. However, the addition of polymers to the spinning solution makes the process more complex, increases the processing time, and results in porous mechanically weak ceramic fibers. Herein, we develop a coelectrospinning technique, where a nonspinnable sol (<10 mPa s) consisting of only the ceramic precursor(s) and solvent(s) is encapsulated inside a polymeric shell, forming core−shell precursor fibers that are further calcined into ceramic fibers with reduced porosity, decreased surface defects, uniform crystal packing, and controlled diameters. We demonstrate the versatility of this method by applying it to a series of nonspinnable sols and creating high-quality ceramic fibers containing TiO 2 , ZrO 2 , SiO 2 , and Al 2 O 3 . The polycrystalline TiO 2 fibers possess excellent flexibility and a high Young's modulus reaching 54.3 MPa, solving the extreme brittleness problem of the previously reported TiO 2 fibers. The single-component ZrO 2 fibers exhibit a Young's modulus and toughness of 130.5 MPa and 11.9 KJ/m 3 , respectively, significantly superior to the counterparts prepared by conventional sol−gel electrospinning. We also report the creation of ceramic fibers in micro-and nanospring morphologies and examine the formation mechanisms using thermomechanical simulations. The fiber assemblies constructed by the helical fibers exhibit a density-normalized toughness of 3.5−5 times that of the straight fibers due to improved fracture strain. This work expands the selection of the electrospinning solution and enables the development of ceramic fibers with more attractive properties.

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