Recycling of waste silk fibers towards silk fibroin fibers with different structures through wet spinning technique

Mollahosseini, Hossein; Fashandi, Hossein; Khoddamı, Akbar; Zarrebini, Mohammad; Nikukar, Habib

doi:10.1016/j.jclepro.2019.117653

Cited by 24 publications

(19 citation statements)

References 49 publications

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“…To realize a higher core content, first, a thin-walled hollow filament has to be melt-spun through a spinneret with an annular co-flow channel [ 35 ] and subsequently filled with the intended liquid by microfluidic technology. Microfluidics provides new ways to produce liquid-core fibers, like post-filled triangular continuous core fibers [ 36 ], necklace-like microfibers produced with co-flow technology [ 37 ], or kidney-shaped continuous core wet-spun fibers [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

Flexible Phase Change Material Fiber: A Simple Route to Thermal Energy Control Textiles

Yan

Zhu

et al. 2021

Materials

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A flexible hollow polypropylene (PP) fiber was filled with the phase change material (PCM) polyethylene glycol 1000 (PEG1000), using a micro-fluidic filling technology. The fiber’s latent heat storage and release, thermal reversibility, mechanical properties, and phase change behavior as a function of fiber drawing, were characterized. Differential scanning calorimetry (DSC) results showed that both enthalpies of melting and solidification of the PCM encased within the PP fiber were scarcely influenced by the constraint, compared to unconfined PEG1000. The maximum filling ratio of PEG1000 within the tubular PP filament was ~83 wt.%, and the encapsulation efficiencies and heat loss percentages were 96.7% and 7.65% for as-spun fibers and 93.7% and 1.53% for post-drawn fibers, respectively. Weak adherence of PEG on the inner surface of the PP fibers favored bubble formation and aggregating at the core–sheath interface, which led to different crystallization behavior of PEG1000 at the interface and in the PCM matrix. The thermal stability of PEG was unaffected by the PP encasing; only the decomposition temperature, corresponding to 50% weight loss of PEG1000 inside the PP fiber, was a little higher compared to that of pure PEG1000. Cycling heating and cooling tests proved the reversibility of latent heat release and storage properties, and the reliability of the PCM fiber.

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Section: Introductionmentioning

confidence: 99%

Flexible Phase Change Material Fiber: A Simple Route to Thermal Energy Control Textiles

Yan

Zhu

et al. 2021

Materials

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“…However, despite their similarities, silkworm silks, while still offering good mechanical properties, are mechanically inferior to spider silks. This has led to significant research on the artificial production of silk fibers using the protein extracted from commercially available silkworm silk fibers, toward achieving properties comparable or even better than the natural spider silk. − More recent efforts to wet spin silk have ranged from methods to spin hollow core fibers to the development of spinning systems that are more biomimetic, , as well as the adaptation of wet spinning as a method to recycle textile fibers …”

Section: Introductionmentioning

confidence: 99%

“…10−13 More recent efforts to wet spin silk have ranged from methods to spin hollow core fibers 14 to the development of spinning systems that are more biomimetic, 15,16 as well as the adaptation of wet spinning as a method to recycle textile fibers. 17 To produce regenerated silk dope from cocoons, one commonly used method consists of degumming the silk cocoons by boiling in an alkaline solution and then dissolving the degummed silk by heating in concentrated lithium bromide solution. The resulting solution is then dialyzed against deionized water and concentrated using reverse dialysis to produce the final spinning dope.…”

Section: ■ Introductionmentioning

confidence: 99%

Improving the Tensile Properties of Wet Spun Silk Fibers Using Rapid Bayesian Algorithm

Allardyce

Rajkhowa

et al. 2020

ACS Biomater. Sci. Eng.

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Wet spinning of silkworm silk has the potential to overcome the limitations of the natural spinning process, producing fibers with exceptional mechanical properties. However, the complexity of the extraction and spinning processes have meant that this potential has so far not been realized. The choice of silk processing parameters, including fiber degumming, dissolving, and concentration, are critical in producing a sufficiently viscous dope, while avoiding silk’s natural tendency to gel via self-assembly. This study utilized recently developed rapid Bayesian optimization to explore the impact of these variables on dope viscosity. By following the dope preparation conditions recommended by the algorithm, a 13% (w/v) silk dope was produced with a viscosity of 0.46 Pa·s, approximately five times higher than the dope obtained using traditional experimental design. The tensile strength, modulus, and toughness of fibers spun from this dope also improved by a factor of 2.20×, 2.16×, and 2.75×, respectively. These results represent the outcome of just five sets of experimental trials focusing on just dope preparation. Given the number of parameters in the spinning and post spinning processes, the use of Bayesian optimization represents an exciting opportunity to explore the multivariate wet spinning process to unlock the potential to produce wet spun fibers with truly exceptional mechanical properties.

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“…[48] It was demonstrated in another study that membranes prepared from native silk fibroin/sericin blends were stronger than membranes prepared from purified fibroin (Figure 2A-D). [4,49,50] Consequently, SS not only provides interesting bioactivity but also improves the mechanical properties of SF, which can be explained by the induction of conformational transitions in the fibroin molecules by two distinct, albeit related mechanisms. [51,52] It has indeed been suggested that due to its hydrophilic character, SS can extract water molecules from spherical micellar (coiled) SF aggregates, which favors self-assembly by promoting inter-and intramolecular hydrogen bonds, and induces a transition into nanofibrils (𝛽-sheets) (Figure 2E).…”

Section: Structure and Physicochemical Propertiesmentioning

confidence: 99%

“…[52] The improvement in properties of the SF-SS composites was attributed to the presence of SS, and to the similarity of the structure to cocoon fibers. [49,50] Unfortunately, several studies on this excellent material, combining the properties of SS and SF, were limited due to the fact that it was found to trigger inappropriate immune response. Obviously, in-depth studies are required to understand the mechanism of the immunological reaction, to be able to modulate this response and make SP more attractive in regenerative medicine.…”

Section: Silk Sericin-silk Fibroin Composite Preparation and Scaffold Designmentioning

confidence: 99%

Immune Response to Silk Sericin–Fibroin Composites: Potential Immunogenic Elements and Alternatives for Immunomodulation

Boni

Bakadia

Osi

et al. 2021

Macromolecular Bioscience

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The unique properties of silk proteins (SPs), particularly silk sericin (SS) and silk fibroin (SF), have attracted attention in the design of scaffolds for tissue engineering over the past decades. Since SF has good mechanical properties, while SS displays bioactivity, scaffolds combining both proteins should exhibit complementary properties enhancing the potential of these materials. Unfortunately, SS-SF composites can generate chronic immune responses and their immunogenic element is not completely clear. The potential of SS-SF composites in tissue engineering, elements which may contribute to their immunogenicity, and alternatives for their preparation and design, to modulate the immune response and take advantage of their useful properties, are discussed in this review. It is known that SS can enhance 𝜷-sheet formation in SF, which may act as hydrophobic regions with a strong affinity for adsorption proteins inducing the chronic recruitment of inflammatory cells. Therefore, tailoring the exposure of hydrophobic regions at the scaffold surface should represent a viable strategy to modulate the immune response. This can be achieved by coating SS-SF composites with SS or other hydrophilic polymers, to take advantage of their antibiofouling properties. Research is still needed to realize the full potential of these composites for tissue engineering.

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Recycling of waste silk fibers towards silk fibroin fibers with different structures through wet spinning technique

Cited by 24 publications

References 49 publications

Flexible Phase Change Material Fiber: A Simple Route to Thermal Energy Control Textiles

Flexible Phase Change Material Fiber: A Simple Route to Thermal Energy Control Textiles

Improving the Tensile Properties of Wet Spun Silk Fibers Using Rapid Bayesian Algorithm

Immune Response to Silk Sericin–Fibroin Composites: Potential Immunogenic Elements and Alternatives for Immunomodulation

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