Acrylic polymer influence on the structure and morphology of AgNPs obtained by chemical method for antimicrobial applications / Alexandra Pica in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 1 (01/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 1 (01/2016) . - p. 53-61 Titre : Acrylic polymer influence on the structure and morphology of AgNPs obtained by chemical method for antimicrobial applications Type de document : texte imprimé Auteurs : Alexandra Pica, Auteur ; Cornelia Guran, Auteur ; Denisa Ficai, Auteur ; Anton Ficai, Auteur ; Florica Dumitru, Auteur Année de publication : 2016 Article en page(s) : p. 53-61 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Argent Colloides -- Stabilité Nanoparticules Polyacryliques Réduction (chimie) Index. décimale : 667.9 Revêtements et enduits Résumé : In this article, we present the synthesis of small silver nanoparticles (AgNPs) with an average size of 1–20(50) nm. Three formulations of AgNPs-based materials have been obtained and characterized by varying the weight ratio of the silver nitrate/acrylic polymer. AgNPs were prepared by simple chemical reduction method. The reduction of AgNO3 was done by sodium borohydride in the presence of acrylic polymer, which acts also as a capping agent of AgNPs, avoiding the use of additional protective agents. The elemental analysis of AgNPs was quantified by X-ray fluorescence. The morphology and size of AgNPs were characterized by SEM and TEM–HRTEM, while the colloidal stability of AgNPs was demonstrated by zeta potential measurements. The influence of acrylic polymer on the stability of AgNPs, the particle sizes, and their antimicrobial efficacy was investigated. The results confirm that the introduction of acrylic polymer during the synthesis, acting as a stabilizing agent, increases the colloidal stability and antimicrobial performances of these formulations. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Equipment - Synthesis of silver nanoparticles - Antimicrobial activity using a time-kill procedure - RESULTS AND DISCUSSION : The colloidal stability of silver nanoparticles in aqueous solution - Morphological assessments - Antibacterial activity DOI : 10.1007/s11998-015-9721-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9721-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25371 [article]

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Colloidal, morphological, thermal, rheological, and film properties of waterborne hyberbranched alkyd-acrylic resins / Edwin A. Murillo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1223-1232 Titre : Colloidal, morphological, thermal, rheological, and film properties of waterborne hyberbranched alkyd-acrylic resins Type de document : texte imprimé Auteurs : Edwin A. Murillo, Auteur ; Judith Percino, Auteur ; Betty L. Lopez, Auteur Année de publication : 2019 Article en page(s) : p. 1223-1232 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Caractérisation Colloides -- Stabilité Copolymère alkyde acrylique Polymères -- Analyse Polymères en émulsion Polymères ramifiés Potentiel zeta Rhéologie Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne hyperbranched alkyd–acrylic resins (HAAR) are interesting materials that provide excellent properties yet require only low levels of solvent in formulations using them. However, they have been scarcely studied. Therefore, the goal of this work was to prepare and evaluate various properties of HAAR. These materials were obtained by miniemulsion polymerization from a hyperbranched alkyd resin (HAR), methyl methacrylate (MMA), butyl acrylate (BA), and acrylic acid (AA). The proportions of HAR:acrylic monomers were as follow: 50:50 (HAAR1), 40:60 (HAAR2), 30:70 (HAAR3), and 20:80 (HAAR4). The particle size increased with the content of HAR, but the colloidal stability, critical deformation, zeta potential, thermal stability, and hardness followed an opposite behavior. The order of colloidal stability of the HAAR miniemulsions was HAAR4 > HAAR3 > HAAR2 > HAAR1. The particle morphology of the HAAR was mainly core–shell, but acrylic and alkyd particles were also observed. In addition, all HAAR initially exhibited a reduction in complex viscosity (η*) with the increase in angular frequency. The thermal stability of the HAR was lower than that of the HAAR. The HAAR showed better resistance against a 0.10 M sodium hydroxide (NaOH) solution than HAR. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of the HAAR - Characterization - RESULTS AND DISCUSSION : IR analysis - DLS analysis - Zeta potential - Contact angle analysis - TEM analysis - TGA - Rheological analysis - Film properties DOI : 10.1007/s11998-019-00205-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00205-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33006 [article]

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Strong synergistic effect of cationic hydrocarbon surfactant and novel nonionic tri-block short-chain fluorocarbon surfactant mixtures on surface activity, wettability and solubilization / Yutang Zhou in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 15 p. Titre : Strong synergistic effect of cationic hydrocarbon surfactant and novel nonionic tri-block short-chain fluorocarbon surfactant mixtures on surface activity, wettability and solubilization Type de document : texte imprimé Auteurs : Yutang Zhou, Auteur ; Yong Jin, Auteur ; Yichao Shen, Auteur ; Liangjie Shi, Auteur ; Shuangquan Lai, Auteur ; Yujia Tang, Auteur Année de publication : 2021 Article en page(s) : 15 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Angle de contact Chimie des surfaces Colloides -- Stabilité Colorants Mélanges (chimie) Micelles Mouillabilité Polytétrafluoréthylène Solubilisation Surfactants Tension superficielle Thermochimie Transmittance La transmittance, en général, est le rapport caractérisant la transmission d'une grandeur dans un système. Elle se calcule par le rapport entre la grandeur en entrée et en sortie. En optique, la transmittance d'un matériau ou d'un filtre est la fraction du flux lumineux le traversant. Elle est également nommée facteur de transmission mais aussi transparence dans le domaine de la photographie. Index. décimale : 541.33 Chimie physique - Chimie des surfaces (Phénomènes superficiels) Résumé : Mixing hydrocarbon surfactants with fluorocarbon surfactants is still an important strategy to improve the economic benefits and performances of fluorocarbon surfactants and expand their range of application. Herein, we prepared a novel kind of hydrocarbon-fluorocarbon surfactant mixtures via mixing a cationic surfactant, cetyltrimethylammonium bromide (CTAB), with a tri-block nonionic short-chain fluorocarbon surfactant (F9EG13F9) in aqueous solution. The results showed that adding a small CTAB amount to F9EG13F9 (the molar fraction of CTAB in the mixture (x1) was 0.2) could greatly reduce its critical micelle concentrations (cmc) from 0.408 mmol/L to 0.191 mmol/L. At this x1, the contact angle of the mixture was the minimum (57.7 °) at 100 s on polytetrafluoroethylene film, which was even lower than that of F9EG13F9. Besides, CTAB/F9EG13F9 mixtures possessed better colloidal stability and solubilization ability toward hydrophobic dye (Sudan І) than F9EG13F9. The outstanding performances of binary surfactant mixtures benefited from the non-ideal mixing and strong synergistic effect evidence that CTAB/F9EG13F9 surfactant mixtures could be used in practical applications instead of individual F9EG13F9, thereby reducing the used cost of F9EG13F9. Note de contenu : - MATERIALS AND METHODS : Materials - Surface tension measurements - Conductivity measurements - Contact angle measurements - Transmittance measurements - Solubilization of hydrophobic dye - RESULTS AND DISCUSSION : Micellization behavior of binary mixtures - Adsorption behavior of binary mixtures - Thermodynamics of binary mixtures - Wettability of binary mixtures - Colloidal stability of binary mixtures - Solubilization of hydrophobic dye - Table 1 : Values of cmc and micellization parameters for CTAB/F9EG13F9 mixtures at different CTAB proportions at 25 °C - Table 2 : Critical surface tension and adsorption parameters for CTAB/F9EG13F9 mixtures at different CTAB proportions at 25 °C - Table 3 : Thermodynamic parameters for CTAB/F9EG13F9 mixtures at different CTAB proportions at 25 °C - Table 4 : Solubilization parameters for CTAB/F9EG13F9 mixtures at different CTAB proportions at 25 °C DOI : https://doi.org/10.1186/s42825-021-00064-1 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00064-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37547 [article]

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