In situ preparation of silver nanocomposites on cellulosic fibers – Microwave vs. conventional heating

Breitwieser, Doris; Moghaddam, Mojtaba Mirhosseini; Spirk, Stefan; Baghbanzadeh, Mostafa; Pivec, Tanja; Fasl, Hubert; Ribitsch, Volker; Kappe, C. Oliver

doi:10.1016/j.carbpol.2013.01.077

Cited by 62 publications

(33 citation statements)

References 76 publications

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“…Generally, the electron microscopy images showed similar sizes and shapes for the nanoparticles made by both the oven and microwave heating methods. These are typical sizes for silver nanoparticles prepared in situ on cellulosic fibers, 1,7,14,25 although only spherical nanoparticles were observed after NaBH 4 reduction. 2 Samples heated in the microwave without any glucose showed a greater proportion of cubic nanoparticles and had the largest nanoparticles with an average diameter of 13.4 (±10.2) nm.…”

Section: Resultsmentioning

confidence: 68%

Microwave-assisted incorporation of silver nanoparticles in paper for point-of-use water purification

Dankovich

2014

Environ. Sci.: Nano

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This work reports an environmentally benign method for the in situ preparation of silver nanoparticles (AgNPs) in paper using microwave irradiation. Through thermal evaporation, microwave heating with an excess of glucose relative to the silver ion precursor yields nanoparticles on the surface of cellulose fibers within three minutes. Paper sheets were characterized by electron microscopy, UV-Visible reflectance spectroscopy, and atomic absorption spectroscopy. Antibacterial activity and silver release from the AgNP sheets were assessed for model Escherichia coli and Enterococci faecalis bacteria in deionized water and in suspensions that also contained with various influent solution chemistries, i.e. with natural organic matter, salts, and proteins. The paper sheets containing silver nanoparticles were effective in inactivating the test bacteria as they passed through the paper.

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Section: Resultsmentioning

confidence: 68%

Microwave-assisted incorporation of silver nanoparticles in paper for point-of-use water purification

Dankovich

2014

Environ. Sci.: Nano

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“…The high cost and the environmental impact caused by the use of reducing agents can be avoided by the replacement with reducing polysaccharides for silver nanoparticles synthesis. Using microwave irradiation the nanocomposite fibers may be obtained by an in situ process where silver nanoparticles are generated by the reduction of AgNO 3 in the presence of chitosan sulfate acting as a reducing agent in close spatial proximity to the fiber where adsorption takes place [53]. All nanocomposites exhibit similar mechanical strength compared to the unmodified fibers and show excellent microbial activity toward E. coli bacteria.…”

Section: Fibers and Microwavesmentioning

confidence: 98%

“…4Comparison of the silver content of the modified fibers in dependence of the initial AgNO 3 concentration obtained by microwave (MW, 80 °C, 5 min) and conventional heating (CH, 80 °C, 2 h) as determined by atomic absorption spectroscopy ([53], reproduced from Carbohydrate Polymers with permission from Elsevier).…”

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confidence: 99%

Microwave-assisted modifications of polysaccharides

Desbrières

Petit

Reynaud

2014

Pure and Applied Chemistry

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Polysaccharides are a natural and renewable feed stock for synthesizing high performance macromolecular materials. However, their structure does not allow reaching all properties required for specific applications and chemical modifications are necessary to reach such objectives. Despite the use of natural polymers, the chemistry and processes employed are not environment-friendly due to the nature of chemicals, solvents or because the conventional chemical process are energy-consuming. On the other hand, microwave assisted processes were developed in organic chemistry since the 1980s and more recently for polymer chemistry (polymer formation and modification). Within the chemistry of natural polymers, the use of microwave irradiation has been exploited in the past two decades to alleviate limitations in the synthesis of graft modified polysaccharide materials. Microwave heating is described as more homogeneous, selective and efficient as compared to conventional heating resulting in faster reactions with fewer or no side products as example. Different results reported within the recent literature will be discussed considering the role of microwave irradiation and its consequence on the reaction parameters and properties of final materials. Grafting of polysaccharides, specific modification of polysaccharides or fibers particularly for preparing smart textiles or medical products as well as reactions of polysaccharides to valuable bio-platform molecule will be discussed.

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“…[40] Several devices containing silver nanoparticles have recently been proposed for use in the fields of dental implantology, periodontology, and alveolar bone regeneration, for example, membranes for guided tissue regeneration (GTR) and guided bone regeneration (GBR) applications, scaffolds for bone regeneration, and dental implant coatings. [41] Although small, spherical silver nanoparticles (4 nm ≤ d ≤ 40 nm) synthesised by green chemistry methods have been reported recently by us and other authors to show good antibacterial activity, [42][43] there appear to be no reports of the synthesis and evaluation of the antibacterial properties of large, anisotropic silver nanoparticles (d ≥ 200 nm), i.e., nanoplatelets, and of their deposition on substrates for practical applications. One of the main reasons for this lack of information is the fact that it is difficult to prepare relatively stable colloidal solutions of large size silver nanoparticles.…”

Section: Accepted Manuscriptmentioning

confidence: 98%

Green synthesis of highly concentrated aqueous colloidal solutions of large starch-stabilised silver nanoplatelets

Cheng

Betts

Kelly

et al. 2015

Materials Science and Engineering: C

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A simple, environmentally friendly and cost-effective method has been developed to prepare a range of aqueous silver colloidal solutions, using ascorbic acid as a reducing agent, water-soluble starch as a combined crystallising, stabilising and solubilising agent, and water as the solvent. The diameter of silver nanoplatelets increases with higher concentrations of AgNO3 and starch. The silver nanoparticles are also more uniform in shape the greater the diameter of the nanoparticles. Colloidal solutions with a very high concentration of large, flat, hexagonal silver nanoplatelets (~230 nm in breadth) have been used to deposit and fix an antibacterial coating of these large starch-stabilised silver nanoplates on commercial cotton fibres, using a simple dip-coating process using water as the solvent, in order to study the dependence of the antibacterial properties of these nanoplatelets on their size.

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In situ preparation of silver nanocomposites on cellulosic fibers – Microwave vs. conventional heating

Cited by 62 publications

References 76 publications

Microwave-assisted incorporation of silver nanoparticles in paper for point-of-use water purification

Microwave-assisted incorporation of silver nanoparticles in paper for point-of-use water purification

Microwave-assisted modifications of polysaccharides

Green synthesis of highly concentrated aqueous colloidal solutions of large starch-stabilised silver nanoplatelets

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