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Surface analysis of particles / C. Bellmann in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B1 (03/2006)
[article]
Titre : Surface analysis of particles Type de document : texte imprimé Auteurs : C. Bellmann, Auteur ; N. Petong, Auteur ; A. Caspari, Auteur ; W. Jenschke, Auteur ; F. Simon, Auteur ; K. Grundke, Auteur Année de publication : 2006 Article en page(s) : p. 69-75 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Electro-osmose
Electrocinétique (effets d'interface)
Mouillage (chimie des surfaces)
Particules (matières) -- Analyse
Pigments
Potentiel zeta
Revêtements organiques
Spectroscopie de photoélectrons
Surfaces -- Analyse
Tension superficielleIndex. décimale : 667.9 Revêtements et enduits Résumé : Normally, commercial coatings are filled with small particles in the form of pigments or fillers. The general properties of surface coating systems significantly depend on the stability of such systems, and on the interaction forces between polymer matrix and particle. The knowledge about the mechanism of these interaction forces enables us to control the lacquer properties. One of the well known physical models of colloid stability is given by the Derjaguin, Landau, Verwey and Overbeek (DLVO) Theory. In this case, it is necessary to know the electrokinetic potential of the used particles. In this paper, the authors demonstrate two new methods of measuring the electrokinetic potential of such particles: namely streaming potential measurements with a special cell and electro-osmosis.
The basic requirement to combine pigment particles with the polymer matrix is a good wetting of these particles by the polymer melt. It is possible to assess the wetting properties from a knowledge of the surface tension of both components. The method of capillary penetration was used to determine the surface tension of these particles. In this paper, the authors will discuss some parameters that should be considered for the interpretation of capillary penetration experiments.Note de contenu : - EXPERIMENTAL : Electrokinetics - Surface tension - X-ray photoelectron spectroscopy
- RESULTS AND DISCUSSION : Electrokinetic resultsDOI : 10.1007/BF02699617 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699617.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37524
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Code-barres Cote Support Localisation Section Disponibilité 003916 - Périodique Bibliothèque principale Documentaires Disponible Surface characteristics and dyeing properties of polyimide fabric treated with sodium hydroxide / Gang Bai in COLORATION TECHNOLOGY, Vol. 135, N° 1 (02/2019)
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Titre : Surface characteristics and dyeing properties of polyimide fabric treated with sodium hydroxide Type de document : texte imprimé Auteurs : Gang Bai, Auteur ; Yanchun Liu, Auteur ; Hong-Fei Qian, Auteur Année de publication : 2019 Article en page(s) : p. 53-59 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie)
Fibres textiles -- Surfaces
Fibres textiles synthétiques -- Propriétés tinctoriales
Hydroxyde de sodiumL'hydroxyde de sodium, appelé également soude caustique7, est un corps chimique composé minéral de formule chimique NaOH, qui est à température ambiante un solide ionique. Fusible vers 318 °C, il se présente généralement sous forme de pastilles, de paillettes ou de billes blanches ou d'aspect translucide, corrosives et très hygroscopiques. Il est très soluble dans l'eau et légèrement soluble dans l'éthanol.
La solution d'hydroxyde de sodium, souvent appelée soude, est une solution aqueuse transparente. Concentrée, elle est corrosive et souvent appelée lessive de soude.
Les propriétés chimiques de l'hydroxyde de sodium sont surtout liées à l'ion hydroxyde HO- qui est une base forte. En outre, l'hydroxyde de sodium réagit avec le dioxyde de carbone (CO2) de l'air et se carbonate.
La solubilité de la soude caustique dans l'eau augmente avec la température, à pression constante ou ambiante.
Isotherme d'adsorption
Mesure
Polyimides
Potentiel zeta
Spectroscopie de photoélectrons
Teinture -- Fibres textiles synthétiques
Topographie
Traîtements de surfaceIndex. décimale : 667.3 Teinture et impression des tissus Résumé : A polyimide fabric was treated with sodium hydroxide to improve its dyeing property. The X-ray photoelectron spectroscopy analysis showed that carboxyl groups were introduced onto the fibre surface after an alkali treatment. The mean zeta potentials were 7.19 mV for the original sample and -12.1 mv for the treated sample. The surface morphology measured using atomic force microscopy and scanning electron microscopy indicated the presence of a very rough surface structure for the alkali-treated sample. The alkali-treated sample showed a higher equilibrium exhaustion than the untreated sample did. The adsorption isotherms of the treated fabric followed the Langmuir sorption model. Note de contenu : - EXPERIMENTAL : Materials - Polyimide fabric modification - Dyeing - Measurements
- RESULTS AND DISCUSSIONS : XPS - Zeta potential - Surface topography - XRD - Dyeing propertiesDOI : 10.1111/cote.12364 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12364 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31666
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Code-barres Cote Support Localisation Section Disponibilité 20582 - Périodique Bibliothèque principale Documentaires Disponible 20583 - Périodique Bibliothèque principale Documentaires Disponible Surface charge and isoelectric point of leather : a novel determination method and its application in leather making / Ya-Nan Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 7 (07/2017)
[article]
Titre : Surface charge and isoelectric point of leather : a novel determination method and its application in leather making Type de document : texte imprimé Auteurs : Ya-Nan Wang, Auteur ; Wanli Huang, Auteur ; Hongshou Zhang, Auteur ; Ling Tian, Auteur ; Jianfei Zhou, Auteur ; Bi Shi, Auteur Année de publication : 2017 Article en page(s) : p. 224-231 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir
Point isoélectriqueEn biochimie, le point isoélectrique (pI) ou potentiel hydrogène isoélectrique (pHI) est le pH auquel une molécule est sous forme d'ion mixte ou, en physico-chimie, le pH d'une solution aqueuse dans laquelle un solide existe sous un potentiel électrique neutre.
En physico-chimie : Selon Bolger, le caractère acide ou basique d'une surface s'exprime par son point isoélectrique " Is ou IEPS (Iso Electric point for the surface) " ou point de charge nulle " PCN ou PZC (Point of Zero Charge) ", défini comme étant le pH de la solution aqueuse dans laquelle le solide existe sous un potentiel électrique neutre. Si le pH de la solution est basique, la surface est acide, et inversement. La différence entre le PZC et l'IEPS est basée sur le phénomène d'adsorption spécifique. On peut considérer que si la grandeur mesurée ne dépend pas de la solution utilisée pour la mesurer (pH, concentration, nature des ions), alors on a affaire à un PZC. Dans le cas contraire, c'est un IEPS que l'on mesure. Par exemple, quand la mesure de goutte sessile à deux liquides est utilisée, on considère en général qu'il n'y a pas adsorption des ions de cette goutte et que la goutte déplace complètement l'alcane qui sert de deuxième liquide: on est alors en présence d’un PZC. Au contraire, dans les mesures de potentiel d'écoulement (streaming potential), la solution joue un rôle important et c'est un IEPS que l'on mesure. Enfin, la charge nette se définit grâce au pH de la solution aqueuse dans laquelle la surface métallique existe, dans un état électriquement neutre (c’est-à -dire [M-OH2+ surf]=[M-O- surf]) et au PZC.
- Si pH < PZC alors la charge nette est positive
- Si pH > PZC alors la charge nette est négative.
Il existe plusieurs méthodes expérimentales permettant de décrire l’état acido-basique de la surface : la mesure du potentiel d’écoulement, la photoélectrochimie, la mesure de l’angle de contact, et la spectroscopie XPS.
Potentiel zeta
Surfaces -- AnalyseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Surface charge and isoelectric point (pI) of leather play an important role in leather making processes. However, a proper method for the determination of surface charge and pI of leather is unavailable nowadays due to the complexity of leather structure and property, especially for the burgeoning chrome-free tanned leathers. Therefore, it is necessary to develop a quantitative determination method. In this study, a novel method for determining zeta potential (to characterize the surface charge of leather) of solid-state leather was established using a zeta potential analyzer based on the principle of streaming potential. Test conditions including suspension concentration, sample grain size, temperature and conductivity were optimized. Then the pI (the pH value at the zero point of zeta potential) of a variety of chrome-free tanned leathers, such as mineral, vegetable, organic and combination tanned leather, were obtained by this zeta potential method. Moreover, we managed to monitor the pI and surface charge state of zirconium tanned leather during post-tanning processes using this method. As a result, application of this precise and rapid determination method enables us to reasonably regulate the pI and surface charge of chrome-free leather so as to effectively improve tanning and post-tanning performances. Note de contenu : - EXPERIMENTAL : Preparation of leather samples - Procedures for zeta potential and pI determination of leather sample - Effect of suspension concentration on zeta potential of leather - Effect of sample fiber particle size on pI of leather - Effect of temperature on pI of leather - Effect of conductivity on pI of leather - pI determination of leather tanned by a single tanning agent - pI determination of combination tanned leather - pI determination of leather from post-tanning processes
- RESULTS AND DISCUSSION : Optimization of conditions for determining zeta potential and pI of leather - Application of the determination method in leather makingEn ligne : Format de la ressource électronique : https://www.researchgate.net/publication/318445483_Surface_charge_and_isoelectric_point_of_leather_A_novel_determination_method_and_its_application_in_leather_making Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28820
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Code-barres Cote Support Localisation Section Disponibilité 19155 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and retanning performance of a novel melamine resin with ultralow formaldehyde content / Zhou Ji-Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 1 (01/2023)
[article]
Titre : Synthesis and retanning performance of a novel melamine resin with ultralow formaldehyde content Type de document : texte imprimé Auteurs : Zhou Ji-Bo, Auteur ; Liao Xue-Pin, Auteur ; Bi Shi, Auteur Année de publication : 2023 Article en page(s) : p. 23-35 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Caractérisation
Cuir -- Teneur en formaldéhyde
Cuirs et peaux -- Analyse
Cuirs et peaux -- Propriétés mécaniques
Granulométrie
Mélamine -- Synthèse
Mélamine à faible teneur en formaldéhyde
Potentiel zeta
Retannage
Stabilité au stockage
Tannage organiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Diethanolamine, epichlorohydrin (ECH), and lysine were used to change the traditional synthesis route to address the formaldehyde emission issue of melamine resin (MR), and a novel waterborne MR retanning agent with ultralow formaldehyde content (MUF) was finally obtained. The structure of MUF was characterized by Fourier transform infrared spectroscopy, 13C nuclear magnetic resonance, and X-ray photoelectron spectroscopy, and its retanning performances in wet-blue and wet-white leathers were thoroughly investigated. Results showed that the formaldehyde content of MUF was 28.05 mg/kg, which was greatly lower than that of traditional MR (3550.23/2543.45 mg/kg), and the formaldehyde contents of chrome- and TWLZ-tanned leathers retanned by MUF were only 12.68 and 8.98 mg/kg, respectively. The thickening rates of MUF-retanned leather were up to 13.40% (chrome-tanned leather) and 9.58% (TWLZ-tanned leather), and MUF showed a satisfying overall performance in retanning leather. MUF is highly promising in practical application owing to its ultralow formaldehyde content, excellent stability in aqueous solution, and satisfactory retanning behaviors. Note de contenu : - MATERIALS AND METHODS : Materials - MUF preparation - TRP synthesis - CCI preparation - MUF synthesis - Characterizatio of intermediate and final products Fourier transform infrared (FTIR) spectroscopy analysis - Nuclear magnetic resonance (NMR) spectroscopy - X-ray photoelectron spectroscopy (XPS) analysis - Storage stability and release of formaldehyde content during storage - Particle size and isoelectric point (pI) analysis - Absorption of retanning and fatliquoring agents - Thickening rates of retanned leather - Physical and mechanical strength of leather - Determination of free formaldehyde content in leather
- RESULTS AND DISCUSSION : Characterization of retanning agents (FTIR analysis - NMR - XPS analysis) - Storage stability and formaldehyde determination of retanning agents - Particle size and zeta potential - Retanning performances of MUF : Absorption rates of retanning and fatliuqoring agents - Physical and mechanical strengths - Determination of free formaldehyde in leather
- Table 1 : Wet-blue retanning processes
- Table 2 : Wet-white retanning processesDOI : https://doi.org/10.34314/jalca.v118i1.6413 En ligne : https://drive.google.com/file/d/1qaCrrRJcWk_9qkGPtrNZylyJt7DVhboY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39162
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Code-barres Cote Support Localisation Section Disponibilité 24007 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of multi-site polyether amine triazine derivative for sustainable leather manufacturing / Xinju Jia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 4 (04/2022)
[article]
Titre : Synthesis of multi-site polyether amine triazine derivative for sustainable leather manufacturing Type de document : texte imprimé Auteurs : Xinju Jia, Auteur ; Ran Tan, Auteur ; Biyu Peng, Auteur Année de publication : 2022 Article en page(s) : p. 141-152 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique
Blancheur
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés physiques
Environnement -- Etudes d'impact
Epaisseur -- Mesure
Morphologie (matériaux)
Polyéther amine triazine
Polymères -- Synthèse
Potentiel zeta
Tannage synthétique
Température de retraitIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this work, a multi-site polyether amine triazine derivative (ET) was prepared via a one-step process and its structure was confirmed using FT-IR and 1H NMR analyses. Then, the ET was applied to the tanning process and the ET tanning approach optimized and evaluated. The result indicated that after tanning with 8% ET at pH 6 for 6 h, the shrinkage temperature of leather was 83.9°C and the thickness change rate was 97.5%. The XRD, DSC, TG, SEM and Zeta potential analyses demonstrated that ET could couple with the amino groups of the collagen side chains and breaking partial hydrogen bonds between fibers, brought significant improvement to the softness of leather without obvious damage to the high-level structure of collagen. Residual Cl- concentration in the wastewater
decreased 42.1% in the tanning process compared to the conventional chrome tanning method. The emissions of COD and TDS in the tanning process reduced by 40.5% and 27.2%, respectively. It is conceivable that the ET tanning approach provides an improved approach to promote leather industry to develop sustainably.Note de contenu : - EXPERIMENTAL : Materials and equipment - Preparation of polyether amine triazine derivatives (ET) - Fourier Transform Infrared Spectroscopy (FT-IR) - Nuclear magnetic resonance spectroscopy (1H NMR) - Leather tanning processing - Determination of the shrinkage temperature - Determination of the exhaustion rate of tanning agent - Determination of the percent thickness increase - Thermal analysis - Zeta potential analyses - Morphological analyses - Whiteness analysis - X-ray diffraction (XRD) measurement - Determination of physical and mechanical properties - Environmental impact assessment
- RESULTS AND DISCUSSIONS : Characterization of ET - Optimization of the ET tanning conditions - Optimization of the ET tanning temperature - Optimization of the ET dosage - Zeta potential analysis - XRD analysis - Physical performance leather - Whiteness analysis - Morphology analysis - Environmenta impact assessments
- Table 1 : ET tanning process
- Table 2 : CTDT tanning process
- Table 3 : Tanning effect of different ET dosage
- Table 4 : Weight loss in different thermogravimetric stage
- Table 5 : Physical performances of leather tanned with different method
- Table 6 : Whiteness of wet-white tanned by different methodsDOI : https://doi.org/10.34314/jalca.v117i4.4897 En ligne : https://drive.google.com/file/d/1aScYsv5HLo94PmHjL2bri8iHG1jRufx0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37561
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Code-barres Cote Support Localisation Section Disponibilité 23389 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of a waterborne melamine resin and its retanning behaviors investigation / Ning Guo-Qiang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 7 (07/2022)
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