Supercritical Carbon Dioxide Impregnation of Gold Nanoparticles Demonstrates a New Route for the Fabrication of Hybrid Silk Materials

How many nanoparticles can we load in a fiber? How much will leak? Underlying is the relatively new question of the "space available" in fibers for nanoparticle loading. Here, using supercritical carbon dioxide (scCO ) as a carrier fluid, we explored the impregnation in four Indian silks (...

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Bibliographic Details
Published in:Insects (Basel, Switzerland) Switzerland), 2022-01, Vol.13 (1), p.18
Main Authors: Singh, Manish, Dey, Estera S, Bhand, Sunil, Dicko, Cedric
Format: Article
Language:English
Subjects:
Antiinfectives and antibacterials
Bio Materials
Biomaterial
Carbon dioxide
Catalysts
Engineering and Technology
Fabrication
Fibers
Gold
Impregnation
Industrial Biotechnology
Industriell bioteknik
Leakage
Nanofiller
Nanoparticles
Nanotechnology
Natural polymers
Polymers
Questions
Silk
Spectrum analysis
Supercritical carbon dioxide impregnation
Teknik
Textile fibers
Textile industry
Textiles
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Summary:How many nanoparticles can we load in a fiber? How much will leak? Underlying is the relatively new question of the "space available" in fibers for nanoparticle loading. Here, using supercritical carbon dioxide (scCO ) as a carrier fluid, we explored the impregnation in four Indian silks (Mulberry, Eri, Muga, and Tasar) with five standard sizes of gold nanoparticles (5, 20, 50, 100 and 150 nm in diameter). All silks could be permanently impregnated with nanoparticles up to 150 nm in size under scCO impregnation. Accompanying structural changes indicated that the amorphous silk domains reorganized to accommodate the gold NPs. The mechanism was studied in detail in degummed Mulberry silk fibers (i.e., without the sericin coating) with the 5 nm nanoparticle. The combined effects of concentration, time of impregnation, scCO pressure, and temperature showed that only a narrow set of conditions allowed for permanent impregnation without deterioration of the properties of the silk fibers.
ISSN:2075-4450
2075-4450
DOI:10.3390/insects13010018