Biological nanosilver particles for the protection of archaeological stones against microbial colonization

Essa, Ashraf M. M.; Khallaf, Mohamed K.

doi:10.1016/j.ibiod.2014.06.015

Cited by 55 publications

(36 citation statements)

References 30 publications

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“…For example, nano-metals (e.g. silver, copper and zinc) has been wildly applied to improve the physical and mechanical properties of various materials, such as paper, archaeological stones, coatings, woods and wood composites [41][42][43][44][45][46][47][48][49]. It is generally believed that nanoparticles of these metals interact with the bacterial membrane elements, resulting in the structural changes leading to the cell death.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Comparison of resistance improvement to fungal growth on green and conventional building materials by nano-metal impregnation

Huang

Lin

Kunnan

2015

Building and Environment

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Section: A N U S C R I P Tmentioning

confidence: 99%

Comparison of resistance improvement to fungal growth on green and conventional building materials by nano-metal impregnation

Huang

Lin

Kunnan

2015

Building and Environment

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“…The intracellular approach consists of transporting metal ions into the bacterial cell where they are transformed into nanoparticles while the extracellular process involves the trapping of metal ions on the cell surface as metal nanoparticles [ 17 , 18 ]. Moreover, bacteria can release certain metabolites into their microenvironment that can transform metal ions into less soluble metal particles [ 19 ]. Synthesis of metal nanoparticles through bacteria is supported by the fact that the generated particles are environmentally safe and have elevated chemical reactivity [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial potential of consolidation polymers loaded with biological copper nanoparticles

Essa

Khallaf

2016

BMC Microbiol

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BackgroundBiodeterioration of historic monuments and stone works by microorganisms takes place as a result of biofilm production and secretion of organic compounds that negatively affect on the stone matrix.MethodsCopper nanoparticles (CuNPs) were prepared biologically using the headspace gases generated by the bacterial culture Escherichia coli Z1. The antimicrobial activity of CuNPs was evaluated against the bacterial strains Bacillus subtilis, Micrococcus luteus, Streptomyces parvulus, Escherichia coli, Pseudomonas aeruginosa as well as some fungal strains Aspergillus niger, Aspergillus flavus, Penicillium chrysogenum, Fusarium solani and Alternaria solani.ResultsBiological CuNPs demonstrated antibacterial and antifungal activities higher than those of the untreated copper sulfate. At the same time, limestone and sandstone blocks treated with consolidation polymers functionalized with CuNPs recorded apparent antimicrobial activity against E. coli, S. parvulus and B. subtilis in addition to an improvement in the physical and mechanical characters of the treated stones. Furthermore, the elemental composition of CuNPs was elucidated using electron dispersive x-ray system connected with the scanning electron microscope.ConclusionConsolidation polymers impregnated with CuNPs could be used to restrain microbial deterioration in addition to the refinement of physico-mechanical behavior of the historic stones.

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“…In addition to the nano-composites described in the previous sections, other hybrids based on nano-particles have been proposed for applications on materials of the Cultural Heritage. The most common products are: nano-calcite in acrylic matrices [108,109], chemically more compatible with carbonate stones, as an alternative to silica-based treatments; nano-silver particles [110] or Cu-nano-particles [111] in acrylate/methacrylate polymers, to impart antimicrobial properties; silica-calcium oxalate hybrids as consolidants [112]; nano-hydroxyapatite in silane/siloxane matrices for stone consolidation and protection [87,113]; cellulose nano-crystals in UV-light curable in siloxane-modified methacrylic resin for wood protection [6].…”

Section: Other Nano-particles For Hybridsmentioning

confidence: 99%

Novel Attribute of Organic–Inorganic Hybrid Coatings for Protection and Preservation of Materials (Stone and Wood) Belonging to Cultural Heritage

Frigione

Lettieri

2018

Coatings

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In order to protect a material belonging to Cultural Heritage (i.e., stone, wood) from weathering, and in turn to preserve its beauty and historical value for the future generations, the contact with external harmful agents, particularly water, must be avoided, or at least limited. This task can be successfully obtained with the use of a protective organic coating. The use of nano-metric reinforcing agents in conventional polymeric coatings demonstrated to be a successful route in achieving better protective performance of the films and improved physical properties, even in extreme environments. The present paper would, therefore, review the more recent findings in this field. Generally speaking, when a hydrophobic product is applied on its surface, the stone material will absorb less water and consequently, less substances which may be harmful to it. An efficient organic coating should also supply wear and abrasion resistance, resistance to aggressive chemicals, excellent bond to the substrate; finally, it should be also able to guarantee vapor exchange between the environment and the material interior, i.e., the material should keep the same water vapor permeability as if it was un-protected. To regard to the conservation of wood artifacts, protective treatments for wood will preserve the material from environmental agents and biological attack. Hence, potential advantages of hybrid (organic–inorganic) nano-composite coatings for stone/wood have been found to be: Enhanced mechanical properties in comparison to the pure polymeric matrix, due to the reinforcing effect of the nano-filler; superior barrier properties (the presence of the nano-filler hinders the ingress of water and/or potentially harmful chemicals); optical clarity and transparency. It has been found that the efficacy of a nano-filled coating strongly depends on the effectiveness of the method used to uniformly disperse the nano-filler in the polymeric matrix. Furthermore, the presence of nano-particles should not impair the viscosity of the organic matrix, in order to employ the conventional techniques of application for coatings.

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Biological nanosilver particles for the protection of archaeological stones against microbial colonization

Cited by 55 publications

References 30 publications

Comparison of resistance improvement to fungal growth on green and conventional building materials by nano-metal impregnation

Comparison of resistance improvement to fungal growth on green and conventional building materials by nano-metal impregnation

Antimicrobial potential of consolidation polymers loaded with biological copper nanoparticles

Novel Attribute of Organic–Inorganic Hybrid Coatings for Protection and Preservation of Materials (Stone and Wood) Belonging to Cultural Heritage

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