Preparation and properties of films of fibroin-polyvinyl alcohol blends from solutions in hexafluoroisopropanol

Sashina, E. S.; Novoselov, N. P.; Vnuchkin, A. V.; Golubikhin, A. Yu.

doi:10.1134/s1070427207030226

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…Silks have been subjected to calorimetric tests for over 20 years but with the focus either on natural spun fibers (which are not directly relevant in the context of this work) or artificial silk feedstocks/films, where processing has altered the state of hydration so much that these artificial silks may no longer represent a native unspun silk protein/model aquamelt . However, in the early 2000s, Tanaka et al.…”

Section: Introductionmentioning

confidence: 99%

Differential Scanning Calorimetry of Native Silk Feedstock

Holland

Hawkins²,

Frydrych³

et al. 2018

Macromolecular Bioscience

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Native silk proteins, extracted directly from the silk gland prior to spinning, offer access to a naturally hydrated protein that has undergone little to no processing. Combined with differential scanning calorimetry (DSC), it is possible to probe the thermal stability and hydration status of silk and thus investigate its denaturation and solidification, echoing that of the natural spinning process. It is found that native silk is stable between −10 °C and 55 °C, and both the high‐temperature enthalpy of denaturation (measured via modulated temperature DSC) and a newly reported low‐temperature ice‐melting transition may serve as useful quality indicators in the future for artificial silks. Finally, compared to albumin, silk's denaturation enthalpy is much lower than expected, which is interpreted within a recently proposed entropic desolvation framework which can serve to unveil the low‐energy aquamelt processing pathway.

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Section: Introductionmentioning

confidence: 99%

Differential Scanning Calorimetry of Native Silk Feedstock

Holland

Hawkins²,

Frydrych³

et al. 2018

Macromolecular Bioscience

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“…XRD spectra of PVDF, PVA, FeC 2 O 4 /BWO, and PVDF@PVA–FeC 2 O 4 /BWO membranes are shown in Figure a. The peak of pure PVA is observed in the PVDF@PVA–FeC 2 O 4 /BWO spectra (2θ = 19.8°) (JCPDS 53-1847) . When FeC 2 O 4 /BWO was combined with the PVDF membrane, the relative intensity of the peaks at 2θ = 28.5 and 33.1° was increased in PVDF@PVA–FeC 2 O 4 /BWO membranes .…”

Section: Resultsmentioning

confidence: 99%

“…The peak of pure PVA is observed in the PVDF@PVA−FeC 2 O 4 / BWO spectra (2θ = 19.8°) (JCPDS 53-1847). 29 When FeC 2 O 4 / BWO was combined with the PVDF membrane, the relative intensity of the peaks at 2θ = 28.5 and 33.1°was increased in PVDF@PVA−FeC 2 O 4 /BWO membranes. 30 Thus, it was concluded that PVA and FeC 2 O 4 /BWO were strongly grafted on the surface of the PVDF membrane.…”

Section: ■ Introductionmentioning

confidence: 92%

Synergy of Adsorption and Photocatalytic Reduction for Efficient Removal of Cr(VI) with Polyvinylidene Fluoride@Polyvinyl Alcohol–FeC₂O₄/Bi_2.15WO₆

Pan

Cai

et al. 2023

Langmuir

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Although the photocatalytic reduction of Cr(VI) to Cr(III) by traditional powder photocatalysts is a promising method, the difficulty and poor recovery of photocatalysts from water hinder their wide practical applications. Herein, we present that FeC2O4/Bi2.15WO6 (FeC2O4/BWO) composites were tightly bonded to modified polyvinylidene fluoride (PVDF) membranes by chemical grafting with the aid of polyvinyl alcohol (PVA) to form photocatalytic composite membranes (PVDF@PVA–FeC2O4/BWO). The contact angle of PVDF@PVA–FeC2O4/BWO (0.06 wt % of FeC2O4/BWO) is 48.0°, which is much lower than that of the pure PVDF membrane (80.5°). Meanwhile, the permeate flux of 61.43 g m–2 h–1 and water flux of 250.60 L m–2 h–1 were observed for PVDF@PVA–FeC2O4/BWO composite membranes. The tensile strength of composite membranes reached 48.84 MPa, which was 9.8 times higher than that of PVDF membrane. It was found that the PVDF@PVA–FeC2O4/BWO membrane exhibited excellent photocatalytic Cr(VI) reduction performance under both simulated and real sunlight irradiation. The adsorption for Cr(VI) by PVDF@PVA–FeC2O4/BWO can reach 47.6% in the dark process within 30 min, and the removal percentage of Cr(VI) could reach 100% with a rate constant k value of 0.2651 min–1 after 10 min of light exposure, indicating a synergistic effect of adsorption and photoreduction for Cr(VI) removal by the composite membrane. The PVDF@PVA–FeC2O4/BWO membrane had good stability and reusability after seven consecutive cycles. Most importantly, the influences of foreign ions on Cr(VI) reduction were investigated to mimic real sewage, which revealed that no obvious adverse effects can be found with the presence of common foreign ions in sewage. The photocatalytic membrane material developed in this study provides a new idea for treating Cr(VI)-containing wastewater and has a more significant application prospect.

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“…Dissolution of waste in aqueous salt or organic solvents [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] and subsequent production of various medical materials from these solutions [27][28][29][30][31][32][33] are considered to be the most promising way of obtaining nonwoven materials from short silk waste.…”

Section: Recycling Silk Waste Up To 40 MM Long Into Nonwovensmentioning

confidence: 99%

The Current State and Prospects of Recycling Silk Industry Waste into Nonwoven Materials

Sashina¹,

Yakovleva²

2023

Preprint

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Natural fibres are the preferred options for garment, technical and medical textiles, nonwovens and composites. Their sustainability is a considerable advantage. Though, the nature of silk production and processing involves a large amount of waste. The present review explores the current issues of recycling silk waste into nonwovens for medical and air filtration purposes. The article proposes to obtain nonwovens from short fibres using electrospinning of fibroin solutions in volatile solvents. Longer fibres are proposed to be processed into needle punched nonwoven materials with a selection of an effective antistatic treatment.

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Preparation and properties of films of fibroin-polyvinyl alcohol blends from solutions in hexafluoroisopropanol

Cited by 8 publications

References 21 publications

Differential Scanning Calorimetry of Native Silk Feedstock

Differential Scanning Calorimetry of Native Silk Feedstock

Synergy of Adsorption and Photocatalytic Reduction for Efficient Removal of Cr(VI) with Polyvinylidene Fluoride@Polyvinyl Alcohol–FeC₂O₄/Bi_2.15WO₆

The Current State and Prospects of Recycling Silk Industry Waste into Nonwoven Materials

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Preparation and properties of films of fibroin-polyvinyl alcohol blends from solutions in hexafluoroisopropanol

Cited by 8 publications

References 21 publications

Differential Scanning Calorimetry of Native Silk Feedstock

Differential Scanning Calorimetry of Native Silk Feedstock

Synergy of Adsorption and Photocatalytic Reduction for Efficient Removal of Cr(VI) with Polyvinylidene Fluoride@Polyvinyl Alcohol–FeC2O4/Bi2.15WO6

The Current State and Prospects of Recycling Silk Industry Waste into Nonwoven Materials

Contact Info

Product

Resources

About

Synergy of Adsorption and Photocatalytic Reduction for Efficient Removal of Cr(VI) with Polyvinylidene Fluoride@Polyvinyl Alcohol–FeC₂O₄/Bi_2.15WO₆