Coffee/polydimethylsiloxane composite coating for preventing marine biofouling / Limei Tian in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 949-955 Titre : Coffee/polydimethylsiloxane composite coating for preventing marine biofouling Type de document : texte imprimé Auteurs : Limei Tian, Auteur ; Jianfu Wang, Auteur ; Yue Yin, Auteur ; Wei Bing, Auteur ; Wenbo Du, Auteur ; Huichao Jin, Auteur Année de publication : 2023 Article en page(s) : p. 949-955 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anti-algues Antibactériens Café et constituants Caractérisation Enrobage (technologie) Essais (technologie) Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Revêtements antisalissures Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Marine biofouling is a major issue in the marine industry. Traditional antifouling coatings have been banned worldwide due to their toxicity to nontarget organisms. Herein, we reported a polydimethylsiloxane (PDMS) coating with coffee as antifoulants. In the study, two coffee/PDMS composite coatings with 5 and 10% weight coffee were prepared, and pristine PDMS was selected as the control. In the early stage of biofouling, the settlement of microalgae and bacteria is crucial for the biofilm formation; thus, the Chlorella and bacteria Paracoccus pantotrophus (P. pantotrophus) were employed as the fouling models in the antifouling tests. In the antialgal test, both coffee/PDMS coatings exhibited excellent antialgal capability, while pristine PDMS was covered with many algal cells. In the antibacterial test, both coffee coatings showed better antifouling capability than the pristine PDMS, and the 10% coffee coating showed the best antifouling capability. A further study revealed that the coffee could inhibit the growth of P. pantotrophus in the liquid environment. According to the immersion and antibacterial tests, it could be concluded that the coffee coatings released coffee to surroundings to prevent biofouling. Overall, the 10% coffee/PDMS coating is a good choice for preventing marine biofouling, but the coffee leaching may be a barrier for long-term use. Note de contenu : - MATERIALS AND METHODS : Materials - Pretreatment of coffee - Fabrication of coffee/PDMS (CP) coatings - Characterization of CP coatings - Antialgal assays - Antibacterial assays - Weight loss tests - RESULTS AND DISCUSSION : Characterization - Antifouling assays DOI : https://doi.org/10.1007/s11998-022-00714-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00714-x.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39439 [article]

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Formulation and testing of a slow-release antimicrobial paint: a case study of antifungi and antialgae activity for interior and exterior applications / Amir S. Kazemi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 573-585 Titre : Formulation and testing of a slow-release antimicrobial paint: a case study of antifungi and antialgae activity for interior and exterior applications Type de document : texte imprimé Auteurs : Amir S. Kazemi, Auteur ; Roozbeh Mafi, Auteur ; Drew C. Higgins, Auteur Année de publication : 2023 Article en page(s) : p. 573-585 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anti-algues Antifongiques Antimicrobiens Essais accélérés (technologie) Formulation (Génie chimique) Lixiviation Polyacryliques Revêtements organiques Spectroscopie ultraviolette Système de libération contrôlée (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : The colonization of microorganisms on painted surfaces varies according to paint formulation, support substrate, and environmental conditions. Developing antimicrobial coatings to prevent growth of microorganisms can prevent adverse health and environmental consequences. Release of antimicrobial agents from the coating surface over time presents toxicity and diminishing antimicrobial protection challenges. Herein, we have formulated and performed 272 tests (including the control experiments, and not including the replication assays) on water-based paint formulations against different species, including Aureobasidium pullulans and Chlorella vulgaris, among others, before and after accelerated weathering tests. Based on the zone of inhibition values (Z value) from fungi and algae resistance tests, 97% of the formulations were effective against fungi species prior to accelerated weathering, while approximately one-third were effective against algae species. Formulations with lower Z values (X2-678, X3-P20T, R1-663, and X2-663) indicated slow release of the biocide via diffusion-controlled behavior is effective in performance optimization and minimizing environmental impacts. For antialgae applications, R1-663 and X2-663 with average Z value variations of 3.3 and 2.0 mm, respectively, ensure full protection. Weathering testing demonstrated 3 of 10 samples failed by cracking and delamination. The main objective of this work is to evaluate, compare, and enhance antimicrobial paint formulations considering the advantages of slow-release and controlled-release approaches. Among samples that passed weathering tests, X1-663, X1-P20T, X3-663, and X3-P20T had the most consistent antifungi activity, while X1-663 and X3-663 showed the best antialgae activity. The difference in antifungi and antialgae activity was mainly attributed to differences in release mechanism based on biocides’ solubility in water, size, and diffusion through the coating layer. Note de contenu : - MATERIALS AND METHODS : Formulation - Resistance tests against fungi and algae - Weathering test - Biocide leaching quantification by UV-Vis spectroscopy - RESULTS AND DISCUSSION : Fungi and algae resistance tests - Accelerated weathering test - Biocide release detection - Table 1: Acrylic antimicrobial paint formulation - Table 2 : List of the biocides used in this work - Table 3 : Type and concentration of resin and crosslinker present in each formulation - Table 4 : Accelerated weathering results DOI : https://doi.org/10.1007/s11998-022-00691-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00691-1.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39300 [article]

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