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Influence of ultrasound on the adsorption, diffusion and kinetics of leather dyeing process : mechanistic insight / Venkatasubramanian Sivakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 7 (07/2020)
[article]
Titre : Influence of ultrasound on the adsorption, diffusion and kinetics of leather dyeing process : mechanistic insight Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur Année de publication : 2020 Article en page(s) : p. 239-247 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants -- Adsorption
Colorants acides
Cuirs et peaux -- Teinture
Diffusion (physique)
Rouge (couleur)
UltrasonsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather is a natural porous material, which is composed of a three-dimensional weave of tanned collagen fibre bundles. This paper studies the influence of power ultrasound on the adsorption and kinetics of leather dyeing process. Dyeing experiments have been carried out using ultrasound (150 W, 33 kHz) and compared with that of static control dyeing process. The data of dye uptake in leather have been analysed using Freundlich and Langmuir adsorption isotherms. Intra Particle diffusion model has been employed to calculate Intra particle diffusion rate constant and Boundary Layer effect. Diffusion coefficient (D) of dye through leather matrix has also been calculated. Kinetics of leather dyeing process has been studied through pseudo first and second order rate equation. The Freundlich constant (Kf), Langmuir parameter (Qm), Intra Particle diffusion rate constant (Kd) Apparent Diffusion coefficient (D) and Pseudo First order kinetic constant, K1 have been calculated to be 18.67 mg/g, 50 mg/g, 0.006 min-1, 1.89 * 10-6 cm2/s and 1.7 mg/g min0.5 respectively for ultrasound assisted leather dyeing as compared to that of 0.1 mg/g, 26.67 mg/g, 0.733 min-1, 0.19 * 10-6 cm2/s and 0.003 mg/g min0.5 respectively for control process. The results indicate that significant enhancement in adsorption capacity with more favorable dye adsorption as well as about 10- fold increase in Apparent Diffusion coefficient with significant reduction in boundary layer effect, improved kinetic parameters due to the use of ultrasound in leather dyeing as compared to control. Mechanisms for enhancement in Adsorption and Kinetic Parameters in leather dyeing due to the use of ultrasound have been presented and corroborate well with better dye penetration, color value and fastness properties. Therefore, the present study demonstrates that the use of ultrasound in leather dyeing helps both in adsorption of dyes as well as diffusion process through the leather matrix. Note de contenu : - INTRODUCTION : Novelty of the present work
- EXPERIMENTAL : Ultrasonic experimental set-up - Materials and methods - Analysis of acid red dye
- RESULTS AND DISCUSSIONS : Adoption isotherm - Intra particle diffusion model - Diffusion coefficient in leather dyeing - Kinetic constants in leather dyeing - Mechanisms for enhancement in adsorption and kinetic parameters in leather dyeing due to the use of ultrasoundDOI : https://doi.org/10.34314/jalca.v115i7.3834 En ligne : https://drive.google.com/file/d/1OGWRbzN7QUB-aQY6ZXbm_whWvwnOXx3p/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34325
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 7 (07/2020) . - p. 239-247[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21879 - Périodique Bibliothèque principale Documentaires Disponible Influence on rex rabbit hair by low-temperature plasma in different gas media / Zhang Meina in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 2 (03-04/2019)
[article]
Titre : Influence on rex rabbit hair by low-temperature plasma in different gas media Type de document : texte imprimé Auteurs : Zhang Meina, Auteur ; Liu Hongyan, Auteur ; Li Lixin, Auteur ; Zhang Zongcai, Auteur Année de publication : 2019 Article en page(s) : p. 91-98 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Basses températures
Brillance (optique)
Colorants acides
Colorimétrie
Fixation (chimie)
Fourrures -- Propriétés mécaniques
Fourrures -- Teinture
Frottements (mécanique)
Lapins
Mesure
Spectroscopie de photoélectrons
Technique des plasmasIndex. décimale : 675.3 Technologie de la fourrure Résumé : In order to find out changes of the Rex rabbit hair under different Low Temperature Plasma (LTP) treatments, Rex rabbit hair fibres which were modified by oxygen, nitrogen, and air plasma, were examined by XPS, ultraviolet-visible spectrophotometery, Lab-eye software, HP-386 multi-angle gloss meter, YM-06A electronic single fibre strength meter, as well as by a Y151 fibre friction coefficient tester. The results show that oxygen plasma, nitrogen plasma and air plasma can all dramatically enhance exhaustion and fixation rate of Rex rabbit hair during dyeing. Treatment with air plasma and nitrogen plasma introduced more -NH2 to the surface of Rex rabbit hair fibres, promoting the reaction between -N1-12 and -SO3H of an anionic dyestuff in an acidic medium. Besides, the oxidation of oxygen plasma introduces polar functional groups such as hydroxyl or carbonyl, thus improving the hydrophilicity of Rex rabbit hair fibres. Compared with fibres without plasma treatment, the dyeing depth of fibres treated with oxygen, air, and nitrogen plasma has been significantly enhanced. ln addition, the rupture strength and elongation as well as glossiness of fibres reduces to a slight extent after LTP treatment with oxygen, nitrogen, and air. Ultimately, after oxygen, air and nitrogen plasma, the gap between the friction coefficients of against and along scale is narrowed, which can enhance the ability of the anti-felting performance. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Low-temperature plasma treatment - Dyeing process - Exhaustion and fixation rate measurement - XPS analysis - Colour measurement - Glossiness and strength measurement - Coefficient of friction determination
- RESULTS AND DISCUSSIONS : Exhaustion and fixation rate - XPS analysis - Effect of LTP treatment on the glossiness and strength of Rex rabbit hair fibre - Effect of LTp treatment on the friction coefficient of Rex rabit wool fibre
- Table 1 : Exhaustion and fixation of different samples dyed with anionic dyestuff
- table 2 : Element analysis of LTP trated Rex rabbit hair fibres
- Table 3 : The functional group content of Rex rabbit hair fibre
- Table 4 : The influence of LTP treatment on the strength of the fibres
- Table 5 : The influence of low-temperature plasma treatment on the friction coefficient of the fibresEn ligne : https://drive.google.com/file/d/1JD27EmIpv-vh44OuM1dkP3JhAoz5JUlR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32306
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 2 (03-04/2019) . - p. 91-98[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20855 - Périodique Bibliothèque principale Documentaires Disponible Interaction of phenol red with cetyltrimethylammonium bromide in aqueous solution in COLORATION TECHNOLOGY, Vol. 131, N° 6 (12/2015)
[article]
Titre : Interaction of phenol red with cetyltrimethylammonium bromide in aqueous solution Type de document : texte imprimé Année de publication : 2015 Article en page(s) : p. 434-438 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bromure de cétyl-triméthyl-ammonium
Colorants acides
Dynamique moléculaire
Solutions aqueuses (chimie)Index. décimale : 667.3 Teinture et impression des tissus Résumé : This paper studies the interaction of anionic dye Phenol Red with cationic surfactant cetyltrimethylammonium bromide in aqueous solution and its influence on the formation of cetyltrimethylammonium bromide micelles for the first time. We obtain a series of thermodynamic parameters of the interaction by establishing a reasonable physical model of the association. Moreover, an in-depth study on the variation in the absorption spectrum finds that the value of absorbance at the maximum absorption peak changes regularly with increase in the cetyltrimethylammonium bromide concentration. By establishing the micellisation models and measuring the changes in electrical conductivity with different cetyltrimethylammonium bromide concentrations, the critical micelle concentration values are obtained, which are essentially the same as the range of concentrations of regular change in absorbance, which shows that the formation of the cetyltrimethylammonium bromide micelles have an impact on the association interaction between Phenol Red and cetyltrimethylammonium bromide. All these data and phenomena illustrate a strong interaction between Phenol Red and cetyltrimethylammonium bromide. Note de contenu : - The association equilibrium constant and spectrogram between phenol red and cetyltrimethylammonium bromide in aqueous solution
- The micellisation thermodynamic parameters of cetyltrimethylammonium bromide in the absence and in the presence of phenol redDOI : 10.1111/cote.12183 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12183 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25089
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Code-barres Cote Support Localisation Section Disponibilité 17685 - Périodique Bibliothèque principale Documentaires Disponible Microcolumn adsorption studies of acid/basic dyes related to the physicochemical properties of the adsorbent / Unai Iriarte-Velasco in COLORATION TECHNOLOGY, Vol. 130, N° 1 (02/2014)
[article]
Titre : Microcolumn adsorption studies of acid/basic dyes related to the physicochemical properties of the adsorbent Type de document : texte imprimé Auteurs : Unai Iriarte-Velasco, Auteur ; Jon I. Alvarez-Uriarte, Auteur ; MarÃa Gonzà lez-Marco, Auteur ; Juan R. Gonzà lez-Velasco, Auteur Année de publication : 2014 Article en page(s) : p. 62-72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants
Acides
Adsorption
AlizarineL'alizarine est un colorant rouge d'origine végétale, extrait de la racine de la garance des teinturiers (Rubia tinctorum L.), une plante vivace de la famille des Rubiacées, autrefois largement cultivée pour la teinture qu'elle fournissait.
Bases (chimie)
Bleu de méthylène
Colorants acidesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The adsorptive removal of cationic Methylene Blue and anionic Alizarin Red S was analysed in microcolumn tests. A detailed analysis of the influence of adsorbent surface acidity/basicity, elemental composition, Brunauer–Emmett–Teller area, pore distribution, and point-of-zero-charge pH on breakthrough properties was carried out. The characteristics of the mass transfer zone were used for evaluation of column performance. Four different activated carbons with different physical and chemical properties were analysed. It was concluded that, for adsorbents containing pores smaller than 1.7 times the solute molecular radius, the interactions between surface and solute have the greatest influence on the effective usage of column uptake capacity. A column packed with adsorbent characterised by large enough pores readily removed either anionic or cationic solutes. Partial correlation analysis revealed that the adsorption of cationic dye (Methylene Blue) was more sensitive to adsorbent textural properties in comparison with anionic dye (Alizarin Red S). Maximum column capacities were 3–4 times higher for cationic Methylene Blue than for anionic Alizarin Red S, with values of 494 and 107 mg/g respectively. The higher solubility of Alizarin Red S could be responsible for its lower and more even removal efficiencies. Finally, the surface chemistry of the adsorbent affected how the operating conditions influenced the column performance, as deduced from the opposite effect of flow rate on the adsorption of Methylene Blue by each adsorbent. Note de contenu : - MATERIAL AND METHODS : Column adsorption - Adsorbates - Characterisation of activated carbons - Assessment of column performance
- RESULTS AND DISCUSSION : Textural properties and surface chemistry - Effect of adsorbent physicochemical properties on column performance - Effect of solute-surface interactions - Effect of operating conditions : flow rateDOI : 10.1111/cote.12058 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12058 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20361
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Code-barres Cote Support Localisation Section Disponibilité 15937 - Périodique Bibliothèque principale Documentaires Disponible N-Sulphonatoalkyl indophenine derivatives: Design, synthesis and dyeing properties on wool, silk and nylon fabrics / Jinfang Cai in COLORATION TECHNOLOGY, Vol. 137, N° 2 (04/2021)
[article]
Titre : N-Sulphonatoalkyl indophenine derivatives: Design, synthesis and dyeing properties on wool, silk and nylon fabrics Type de document : texte imprimé Auteurs : Jinfang Cai, Auteur ; Hua Jiang, Auteur ; Zhihua Cui, Auteur ; Weiguo Chen, Auteur Année de publication : 2021 Article en page(s) : p. 181-192 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption
Colorants -- Propriétés tinctoriales
Colorants -- Synthèse
Colorants acides
Fonctionnelles densitéLa théorie de la fonctionnelle de la densité (pour Density Functional Theory, sous-entendu électronique : DFT) constitue au début du XXIe siècle l'une des méthodes les plus utilisées dans les calculs quantiques de la structure électronique de la matière (atomes, molécules, solides) aussi bien en physique de la matière condensée qu'en chimie quantique. La DFT trouve ses origines dans le modèle développé par Llewellyn Thomas et Enrico Fermi à la fin des années 1920.
Laine
Polyamide 66
Résistance à l'humidité
Soie et constituants
Teinture -- Fibres textilesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The importance of quinonoidal planarity in improving the wet fastness of acid dyes was studied in a new series of N-sulphonatoalkyl-substituted indophenine derivatives. These derivatives were synthesised via the sulphonatoalkylation reaction of isatins with alkanesultone or sodium bromoalkanesulphonate followed by the indophenine reaction. The effects of the position of sulphonic acid groups, length of the alkyl chain, and electron-donating/withdrawing groups on geometry, electronic structure, solubility, and absorption properties were systematically examined and correlated with the performances of the dyes on wool, silk and nylon fabrics. The N-sulphonatoalkyl indophenine dyes could exhibit a blue colour in N,N-dimethylformamide (DMF) and on silk or nylon fabric but a purplish colour in water and on wool fabric. Methoxy groups had a negative impact on the molar extinction coefficient and dye exhaustion, leading to relatively poor dyeing performance. In comparison, fluorine or chlorine atoms were less influential. The introduction of nitro groups could induce a yellowness to the dyed fabrics caused by the strengthened absorption at the region of 360 to 420 nm and reduce the dyeing rate and wet fastness level due to the low dye–fibre affinity. In general, the N-sulphonatoalkyl indophenine dyes exhibited satisfactory washing and rubbing fastness, especially on dyed nylon fabric. This study provides insight into the structure–property relationship of indophenine dyes and demonstrates that sulphonatoalkylation is an efficient methodology for designing high-performance textile dyestuffs based on quinonoidal heterocyclic structures. Note de contenu : - EXPERIMENTAL SECTION : Materials and instrumentation - Synthesis of compouns 2a-2g - Synthesis of D1 to D7 - General dyeing methods for wool, silk and nylon fabrics - Measurement for the dyeing properties
- RESULTS AND DISCUSSION : Synthesis of dyes D1èD7 - Density functional theory calculations - Absorption properties - Dyeing propertiesDOI : https://doi.org/10.1111/cote.12518 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12518 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36077
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