Hair surface interactions against different chemical functional groups as a function of environment and hair condition / Leslie Labarre in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 45, N° 2 (03-04/2023)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 45, N° 2 (03-04/2023) . - p. 224-235 Titre : Hair surface interactions against different chemical functional groups as a function of environment and hair condition Type de document : document électronique Auteurs : Leslie Labarre, Auteur ; Ophélie Squillace, Auteur ; Yu Liu, Auteur ; Peter J. Fryer, Auteur ; Preeti Kaur, Auteur ; Shane Whitaker, Auteur ; Jennifer M. Marsh, Auteur ; Zhenyu J. Zhang, Auteur Année de publication : 2023 Article en page(s) : p. 224-235 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Cheveux -- analyse Cheveux -- Soins et hygiène Cosmétiques Energie de surface Formulation (Génie chimique) Produits capillaires Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : The nature and magnitude of molecular interactions on hair surfaces underpin the design of formulated products, of which the application involves a competitive adsorption process between cationic surfactants, fatty alcohols and surface actives such as silicone. The knowledge of molecular interaction with hair surface will not only provide insight on the surface binding affinity but also offer an effective methodology in characterizing surface deposits. - Methods : Untreated and chemically treated hair samples were treated with either conditioner chassis alone (gel network) or conditioner chassis plus silicone (chassis/TAS). Hair surface interactions against four different chemical functional groups, namely methyl (-CH3), acid (-COOH), amine (-NH2) and hydroxyl (-OH), were quantified in both ambient and aqueous environment using Chemical Force Microscopy, a method based on atomic force microscopy (AFM). - Results : Surface adhesion on hair in ambient is dominated by capillary force that is determined by both the wettability of hair fibre (hydrophobic vs. hydrophilic), presence of any deposits and the chemical functionality of the AFM cantilever. Capillary force is diminished and replaced by electrostatic interaction when polar groups are present on both hair and AFM cantilever. A distinctively different force, hydrophobic interaction, plays a major role when virgin hair and hydrophobic functionalized AFM cantilever make contact in water. - Conclusion : Results acquired by AFM cantilevers of different functional groups show that hydrophobic interaction is a key driver for deposition on virgin hair, whilst electrostatic interaction is the most important one for bleached hair. Interfacial conformation of chassis components upon deposition is determined by the hair surface properties. Our study highlights the possibility of a range of polar groups, not necessarily negatively charged, on the damaged hair. Unlike conventional surface chemical analysis method, it is possible to quantitatively evaluate the interfacial conformation of deposited surface actives on hair, which identifies the target moieties for conditioning products on different types of hair. Note de contenu : - MATERIALS AND METHODS : Materials - Atomic force microscopy - AFM cantilever functionalization - Surface analysis - Surface energy - RESULTS AND DISCUSSION :Surface deposition analysis - Hair surface free energy - Surface morphology of hair fibres - Hair surface adhesion against methyl (-CH3) functional group - Hair surface adhesion against carboxylic acid (-COOH) functional group - Hair surface adhesion against hydroxyl (-OH) functional group - Hair surface adhesion against amine (-NH2) functional group - Table 1 : Silicone and cationic surfactant deposition in μg g-1 as a function of hair type (virgin hair, platinum-bleached hair) and treatment (chassis alone, chassis/TAS) in ambient air. Three hair fibre samples were collected from three different hair tresses, resulting in a total of nine measurements for each type - Table 2 : Surface energy data obtained from contact angles on virgin hair and platinum-bleached hair using hexadecane for the non-polar liquid and water for the polar liquid DOI : https://doi.org/10.1111/ics.12834 En ligne : https://drive.google.com/file/d/1qUQR6DU_sOnv9W97138uGnXS8zH2hwWp/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39172 [article]

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Particle size evolution of melamin-formaldehyde tanning agent on tanning effect / Mengmeng Chen in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 5 (05/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 5 (05/2018) . - p. 151-162 Titre : Particle size evolution of melamin-formaldehyde tanning agent on tanning effect Type de document : texte imprimé Auteurs : Mengmeng Chen, Auteur ; Yahui Wang, Auteur ; Haojun Fan, Auteur ; Yi Chen, Auteur ; Jun Yan, Auteur ; Yu Liu, Auteur Année de publication : 2018 Article en page(s) : p. 151-162 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage Copolymère mélamine-formaldéhyde Cuirs et peaux -- Propriétés mécaniques Polycondensation Stabilité hydrothermale Taille des particules Tannage organique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Melamine-formaldehyde [MF] resin is a tanning agent. Its average particle size [PS] is important for penetrating the skin and thus endowing performance of its resultant leather. The synthesis parameters for MF resin such as pH, molar ratio of formaldehyde to melamine, temperature and reaction time affect its PS. We investigated in detail the growth of MF’s PS and its consequent effects on hydrothermal stability, mechanical properties and the apparent properties of leather. The data showed that a broad range of average PS was formed at the different synthesis stages of MF resin. For example, the first reaction stage of methylolation gave an average particle diameter of 250 nm with a narrow size distribution under the conditions of 45°C, 3:1 molar ratio, a pH of 8.5, and a reaction time of 3 hrs. In this case the resultant leather was poor as it had a low shrinkage temperature, lacked fullness and showed a low-valued elongation at break. During the second polycondensation stage, the PS of MF resin increased with increasing reaction temperature and the molar ratio of formaldehyde to melamine. Furthermore, PS increased more rapidly by lowering the pH of the polycondensation and extending its reaction time. Thus, the new average diameter of MF resin particles reached above 3000 nm when the polycondensation reaction was done inside the skin for 2 hours at a pH of 4.5. Consequently, the resultant leather was white and full. It had a high hydrothermal stability and mechanical strength as evidenced by its fully satisfactory elongation at break. Clearly, the cross-links were formed by multiple site interactions between MF resin with large PS and collagen fibers, which enhanced the tanning effect. Note de contenu : - EXPERIMENTAL : Materials - Reaction of melamine and formaldehyde - Tanning trial - Assessment of properties of tanned leathers - RESULTS AND DISCUSSION : Parameters affecting the particle size of MF resin tanning agent - The effect of tanning agent's PS on properties of tanned leather En ligne : https://drive.google.com/file/d/1nqOi07mAnm5Xjiy0M0yrCKEJqM67qm-7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30533 [article]

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Surface coating performance of TiO2 nanoparticle-modified veneered panels and their influence on formaldehyde emission / Xiao Dong Zhu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1271-1278 Titre : Surface coating performance of TiO2 nanoparticle-modified veneered panels and their influence on formaldehyde emission Type de document : texte imprimé Auteurs : Xiao Dong Zhu, Auteur ; Yu Liu, Auteur ; Li Zhao, Auteur Année de publication : 2017 Article en page(s) : p. 1271-1278 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Air intérieur -- Pollution Atmosphère -- Pollution -- Lutte contre Dioxyde de titane Formaldéhyde Nanoparticules Panneaux de fibres Polluants atmosphériques Polluants organiques Réduction des composés organiques volatils Vernis en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : The physical and mechanical properties of wood and wood-based panels can be effectively improved by modification with nanoparticles. This paper focuses on effects of modifying veneer with titanium dioxide (TiO2) nanoparticles on the performance of a waterborne coating and formaldehyde emission. Commercial waterborne varnish was used to apply a surface finish on the modified veneered panels. Changes caused by TiO2 nanoparticle treatment that could affect the finishing performance were measured. The results showed slight increases in the weight and contact angle of the veneers treated with TiO2 nanoparticles, whereas the modified veneered panels after surface finishing presented improved hardness at high nanoparticle loadings. Modification of the veneers by nanoparticles had a minor negative influence on the coating glossiness and adhesion due to a blocking effect between the coating film and the modified veneers. Formaldehyde emissions were considerably reduced due to degradation by the TiO2 particles under UV-light irritation. Note de contenu : - MATERIALS AND METHODS : Materials - Determination of properties - RESULTS AND DISCUSSION : Effect of nanosized TiO2 particles on the weight percent gain and CA - Appearance of the nanocomposite veneers - Effect of nanoparticles on the surface coating properties - Formaldehyde emission DOI : 10.1007/s11998-017-9925-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9925-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29627 [article]

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