Silver nanoparticulate enhanced aqueous silane/siloxane exterior facade emulsions and their efficacy against algae and cyanobacteria biofouling

MacMullen, James; Zhang, Zhongyi; Dhakal, Hom Nath; Radulovic, Jovana; Karabela, Alkistis; Tozzi, Gianluca; Hannant, Samuel; Alshehri, Mohammed Ali; Buhé, Vincent; Herodotou, Constandinos; Totomis, Miltiadis; Bennett, Nick

doi:10.1016/j.ibiod.2014.05.009

Cited by 37 publications

(15 citation statements)

References 49 publications

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“…This last component has a well known biocide effect on algae species [36] such as Chlorella [37,38]. Nevertheless, in our study, AgNO 3 had a more moderate biocide impact because of the delay in the inhibition of the algae development.…”

Section: Discussioncontrasting

confidence: 52%

Chlorophyll Fluorescence and Colorimetric Analysis for Monitoring the Algal Development on Biocide-Treated Stone

Eyssautier‐Chuine¹,

Vaillant‐Gaveau²,

Gommeaux³

et al. 2016

Open Conf. Proceed. J.

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Abstract:The present study used two non destructive technics, chlorophyll fluorescence and colorimetry to assess the Chlorella vulgaris growth on stone surface treated by experimental treatments for preventing biofouling. A protocol for laboratory tests was set up, consisting of inoculating treated slabs stone with a suspension of an algae culture (Chlorella vulgaris), that is a well known monument colonizing organism. The biofouling test was carried out under fluorescent lights for four weeks at room temperature which was 20°C and monitored by chlorophyll a fluorescence and colorimetry analysis. These techniques are rapid, non-invasive, and reliable.Treatments were introduced by mixing a tetraethoxysilane base with different ingredients: chitosan and/or silver nitrate for biocide effect and/or hydrophobic silica for water repellency.Results revealed four different patterns of algal development. The stones treated with the product containing chitosan and silver nitrate did not show any difference in their fluorescence signal as compared with the untreated stones (control). The stones treated with the product containing only silver nitrate showed biocide effect two weeks after the start of the experiment. The product containing silver nitrate, chitosan and hydrophobic silica at low concentrations completely inhibited algal development in the long term, the similar product with the same compounds at a higher concentration only delayed algal development by 1-2 weeks. This suggests that low concentrations of the products have a synergistic effect, that is lost if they occur in excess. In the present study, chlorophyll a fluorescence proved to be a valuable tool in detecting damage in the photosynthetic system of organisms and as a useful complement to other conventional measurements such as colorimetry.

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Section: Discussioncontrasting

confidence: 52%

Chlorophyll Fluorescence and Colorimetric Analysis for Monitoring the Algal Development on Biocide-Treated Stone

Eyssautier‐Chuine¹,

Vaillant‐Gaveau²,

Gommeaux³

et al. 2016

Open Conf. Proceed. J.

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“…Compounds such as plastic-based products have also been tested but they altered the substrate properties and were less efficient against green biofilms (Prieto et al, 2014). Other biocides, containing a combination of silver nanoparticles and water repellent, showed good algaecidal performance related to their silver concentrations (MacMullen et al, 2014) or the combinations with other chemicals (De Muynck et al, 2009). New non-toxic compounds such as anatase (TiO 2 ) had an efficient photocatalytic effect able to degrade organic matter and to inhibit recolonization (Fonseca et al, 2010;La Russa et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Efficacy of different chemical mixtures against green algal growth on limestone: A case study with Chlorella vulgaris

Eyssautier‐Chuine¹,

Vaillant‐Gaveau²,

Gommeaux³

et al. 2015

International Biodeterioration & Biodegradation

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“…The biological stains lead to significant cleaning costs and to image prejudice in the case of prestigious buildings. Although the microorganisms responsible for these alterations have been quite well identified [32,[38][39][40][41], research is now focusing on determining colonization mechanisms, notably the influential material-related factors [3,35,36,42], and on developing preventive or curative solutions to protect external walls [43][44][45][46][47]. However, some research works seek to improve the bio-receptivity of materials in order to favor the growth of microorganisms such as algae or lichens and higher plants that can improve the appearance and the thermal performance of buildings [48].…”

Section: Microbial Stains On Building Materialsmentioning

confidence: 99%

Understanding interactions between cementitious materials and microorganisms: a key to sustainable and safe concrete structures in various contexts

Bertron

2014

Mater Struct

101

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Building materials can be exposed to microorganisms (mainly bacteria, fungi and algae) in almost every aqueous medium or damp environment, water being the indispensable condition for life development. The activity of microorganisms can be responsible for mineralogical, chemical and microstructural damage to the material (biodeterioration). Deleterious effects can also concern the aesthetics of a building (proliferation of colored biological stains on façades and roofs) or the quality of indoor air (presence of microorganisms in damp buildings). However, microorganisms can also have positive effects (healing of materials) and their action is explored through the development of bio-based protective systems intended for building materials. In all cases, understanding interactions between building materials and microorganisms is an indispensable step toward the development of more sustainable, better quality, safer structures in many environments. This paper presents two examples where the action of microorganisms has-or is likely to have-strong impact on the durability and safety of concrete structures. The first example concerns the biodeterioration of concrete in agricultural and agro-food environments. The second example is that of the abiotic and biotic reactivity of nitrates in repository of intermediate-level long-lived nuclear wastes. The paper presents the approaches used to explore and understand the phenomenology of biogeo-chemical interactions in these complex environments. These studies notably comprise the development of test methods and experimental pilots to enable these explorations to be carried out. Current shortcomings in the scientific literature and in the standardization environment are also highlighted.

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Silver nanoparticulate enhanced aqueous silane/siloxane exterior facade emulsions and their efficacy against algae and cyanobacteria biofouling

Cited by 37 publications

References 49 publications

Chlorophyll Fluorescence and Colorimetric Analysis for Monitoring the Algal Development on Biocide-Treated Stone

Chlorophyll Fluorescence and Colorimetric Analysis for Monitoring the Algal Development on Biocide-Treated Stone

Efficacy of different chemical mixtures against green algal growth on limestone: A case study with Chlorella vulgaris

Understanding interactions between cementitious materials and microorganisms: a key to sustainable and safe concrete structures in various contexts

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