Documents disponibles écrits par cet auteur

Antifouling paints with zinc “tannate” / Natalia Bellotti in Industrial & engineering chemistry research, Vol. 49 N° 7 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3386–3390 Titre : Antifouling paints with zinc “tannate” Type de document : texte imprimé Auteurs : Natalia Bellotti, Auteur ; Cecilia Deyá, Auteur ; Beatriz del Amo, Auteur Année de publication : 2010 Article en page(s) : pp. 3386–3390 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Antifouling  Paints  with  Zinc  Tannate Résumé : During the past decade, the necessity of new ecofriendly antifouling pigments was established. Among these new pigments, special attention should be paid to tannin and its derivatives. Tannins are synthesized by plants as part of their defense mechanism against the attack of pathogens. The objective of this work was to study the antifouling efficiency of paints containing zinc “tannate” in artificial seawater. The zinc “tannate” was precipitated at pH 4 and pH 8. Insoluble and soluble matrix antifouling paints, with different plasticizers, were formulated and tannins leached from the paints immersed in artificial seawater were determined by the Folin−Denis assay for polyphenols. The antifouling action of paints was assessed in a natural seawater environment. The results showed that the leaching rate of tannin from insoluble matrix paint decreases, reaching a constant value after 25 days of immersion. In the case of the soluble matrix paints, a lesser amount of tannin was leached, depending on the tannin and the plasticizer employed. The results in a natural sea environment are dependent on the matrix and the plasticizer employed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9010518 [article] Antifouling paints with zinc “tannate” [texte imprimé] / Natalia Bellotti, Auteur ; Cecilia Deyá, Auteur ; Beatriz del Amo, Auteur . - 2010 . - pp. 3386–3390. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3386–3390 Mots-clés : Antifouling  Paints  with  Zinc  Tannate Résumé : During the past decade, the necessity of new ecofriendly antifouling pigments was established. Among these new pigments, special attention should be paid to tannin and its derivatives. Tannins are synthesized by plants as part of their defense mechanism against the attack of pathogens. The objective of this work was to study the antifouling efficiency of paints containing zinc “tannate” in artificial seawater. The zinc “tannate” was precipitated at pH 4 and pH 8. Insoluble and soluble matrix antifouling paints, with different plasticizers, were formulated and tannins leached from the paints immersed in artificial seawater were determined by the Folin−Denis assay for polyphenols. The antifouling action of paints was assessed in a natural seawater environment. The results showed that the leaching rate of tannin from insoluble matrix paint decreases, reaching a constant value after 25 days of immersion. In the case of the soluble matrix paints, a lesser amount of tannin was leached, depending on the tannin and the plasticizer employed. The results in a natural sea environment are dependent on the matrix and the plasticizer employed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9010518

Quaternary ammonium “Tannate” for antifouling coatings / Natalia Bellotti in Industrial & engineering chemistry research, Vol. 51 N° 51 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16626-16632 Titre : Quaternary ammonium “Tannate” for antifouling coatings Type de document : texte imprimé Auteurs : Natalia Bellotti, Auteur ; Beatriz del Amo, Auteur ; Roberto Romagnoli, Auteur Année de publication : 2012 Article en page(s) : pp. 16626-16632 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Antifouling  coatings Résumé : The undesirable accumulation of a wide variety of marine organisms (biofouling) on ship hulls can lead to significantly increased costs, principally by increased fuel consumption to maintain cruising speed. Generally, these coatings have bioactive compounds, called biocides. In this sense, this paper deals with the assessment of the antifouling properties of a natural product derivative obtained from "quebracho" tannin and a quaternary ammonium salt (hexadecyltrimethylammonium bromide ([CH3(CH2)15N(CH3)3]Br). Two derivatives were obtained depending on the precipitation pH (4 and 8). The bioactivity of these derivatives was assessed by means of the Artemia test. Furthermore, soluble matrix paints were prepared with two different binders: rosin/oleic acid and rosin/styrene-acrylate copolymer. The leaching of "quebracho" tannin derivatives from coatings in artificial seawater was monitored until constant values were obtained, previous to the immersion in natural environments. Finally, the antifouling activity of coatings pigmented with the "quebracho" tannin derivative was evaluated in Mar del Plata harbor (38°08'17"S―57°31'18"W). The coating obtained with the derivative obtained at pH 4 and rosin/oleic acid as binder proved to have an acceptable efficiency for 10 months. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301524r [article] Quaternary ammonium “Tannate” for antifouling coatings [texte imprimé] / Natalia Bellotti, Auteur ; Beatriz del Amo, Auteur ; Roberto Romagnoli, Auteur . - 2012 . - pp. 16626-16632. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16626-16632 Mots-clés : Antifouling  coatings Résumé : The undesirable accumulation of a wide variety of marine organisms (biofouling) on ship hulls can lead to significantly increased costs, principally by increased fuel consumption to maintain cruising speed. Generally, these coatings have bioactive compounds, called biocides. In this sense, this paper deals with the assessment of the antifouling properties of a natural product derivative obtained from "quebracho" tannin and a quaternary ammonium salt (hexadecyltrimethylammonium bromide ([CH3(CH2)15N(CH3)3]Br). Two derivatives were obtained depending on the precipitation pH (4 and 8). The bioactivity of these derivatives was assessed by means of the Artemia test. Furthermore, soluble matrix paints were prepared with two different binders: rosin/oleic acid and rosin/styrene-acrylate copolymer. The leaching of "quebracho" tannin derivatives from coatings in artificial seawater was monitored until constant values were obtained, previous to the immersion in natural environments. Finally, the antifouling activity of coatings pigmented with the "quebracho" tannin derivative was evaluated in Mar del Plata harbor (38°08'17"S―57°31'18"W). The coating obtained with the derivative obtained at pH 4 and rosin/oleic acid as binder proved to have an acceptable efficiency for 10 months. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301524r