Bactericidal and fungicidal action of copper nanoparticles on leather surface / N. Deepak in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 12 (12/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 12 (12/2023) . - p. 519-528 Titre : Bactericidal and fungicidal action of copper nanoparticles on leather surface Type de document : texte imprimé Auteurs : N. Deepak, Auteur ; Inbasekar Chandrasekar, Auteur ; Nishad Fathima Nishter, Auteur Année de publication : 2023 Article en page(s) : p. 519-528 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Cuivre Fongicides Nanoparticules Produits de conservation du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Although tanning makes the collagen matrix resilient against microbial attack, the chemicals used in the finishing process are susceptible to microbes. Hence, it is imperative to develop a finishing process with inherent antimicrobial properties. Leathers with antimicrobial properties evoke a considerable array of interest in consumers. The present study aims to enhance the antimicrobial properties of the leather using copper nanoparticles in the finishing and retanning process. Copper nanoparticles have been synthesized by chemical reduction using copper sulphate pentahydrate as the precursor with dialdehyde starch and gallic acid. The prepared nanoparticles have been characterized using UV-Visible spectrometry, dynamic light scattering, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction techniques. The prepared nanoparticles have been used in both retanning and finishing processes. The experimental leather retanned using copper nanoparticles possess good mechanical strength properties and color index value compare to the control. Nanoparticles are effective against both gram negative and positive bacterial organisms. The nanoparticles also inhibit the growth of common fungus, which can colonize on leather. Thus, the current study paves the way for a novel solution that is an alternative to biocides and antimicrobial chemicals and is more effective in inhibiting microbial growth. Note de contenu : - EXPERIMENTAL : Materials - Methods - RESULTS AND DISCUSSION : Antibacterial activity of copper nanoparticles - Mechanism of bacterial killing - Antifungal activity of copper nanoparticles - Table 1 : Color fastness values of control leather and leather finished using copper nanoparticles - Table 2 : L*a*b* values of control leather and leather retanned using copper nanoparticles - Table 3 : Strength properties values of control leather and leather retanned using copper nanoparticles - Table 4 : Color fastness values of control leather and leather finished using copper nanoparticles DOI : https://doi.org/10.34314/jalca.v118i12.8252 En ligne : https://drive.google.com/file/d/13DmKqLEIwr0TYx0bvHPE-9XCtvA0UiPG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40271 [article]

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Deciphering the role of individual retanning agents on physical properties of leathers / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 3 (03/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 3 (03/2019) . - p. 94-102 Titre : Deciphering the role of individual retanning agents on physical properties of leathers Type de document : texte imprimé Auteurs : Murali Sathish, Auteur ; Bhuvana Subramanian, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Nishad Fathima Nishter, Auteur Année de publication : 2019 Article en page(s) : p. 94-102 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage Biopolymères Copolymère mélamine-formaldéhyde Cuirs et peaux -- Propriétés physiques Phénoplastes Polyacryliques Retannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In post-tanning different types of retanning agents are used in combination to improve the functional properties of leather and therefore understanding the individual effect of each retanning agents on final properties is difficult. This work mainly focuses toward quantifying the individual effect of different weight percentages (4, 8 and 16%) of phenol-formaldehyde resin (PFR), melamine-formaldehyde resin (MFR), acrylic resin (AR) and biopolymers (BP) on physical properties of leather. It was found that the strength characteristics are greatly affected when the retanning agents offer increased above 8% where the effect of phenol-formaldehyde resin is higher than other re-tanning agents. Melamine-formaldehyde resin and biopolymer is predominantly affecting the belly region. It has also been observed that the phenol-formaldehyde resin improves the fullness whereas grain tightness and flatness are improved with increasing the percentages of melamine-formaldehyde resin offer. Biopolymer improves the grain smoothness and the ability of improving the roundness of leather is similar for all kind of retanning agents. A meaningful conclusion could not be drawn in the porosity results obtained due to the heterogeneous nature of leather matrix. Thus, a conventional triplicate method of measurement as done in this study would not suffice to provide a conclusive interpretation of results obtained using capillary flow porometry technique. Note de contenu : - EXPERIMENTAL METHODOLOGY : Analysis of physical strength characteristics - Analysis of porosity - RESULTS AND DISCUSSIONS : effect of phenol-formaldehyde resin (PFR) on physical strength characteristics - Effect of melamine-formaldehyde resin (MFR) on physical strength characteristics - Effect of acrylic resin (AR) on physical strength characteristics - Effect of protein based biopolymer (BP) on physical strength characteristics - Effect of re-tanning agents on porosity - Effect of re-tanning agents on organoleptic properties En ligne : https://drive.google.com/file/d/1c7oRcD0zU0flHM8vo0i4mnnKr3Fp2TDF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31930 [article]

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Dual functional replacement syntans for leather / Jaya Prakash Alla in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 3 (03/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 3 (03/2021) . - p. 83-88 Titre : Dual functional replacement syntans for leather Type de document : texte imprimé Auteurs : Jaya Prakash Alla, Auteur ; Nishad Fathima Nishter, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2021 Article en page(s) : p. 83-88 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Calorimétrie Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés organoleptiques Encapsulation Imagerie (technique) Microscopie électronique à balayage Syntans Transition de phase En physique, une transition de phase est une transformation du système étudié provoquée par la variation d'un paramètre extérieur particulier (température, champ magnétique...). Cette transition a lieu lorsque le paramètre atteint une valeur seuil (plancher ou plafond selon le sens de variation). La transformation est un changement des propriétés du système. Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In the present study we have synthesised thermoresponsive syntan using phase changing material (PCM) encapsulated into a replacement syntan. Syntan was analysed for their particle size, thermal response was verified using Differential scanning calorimetry (DSC) and surface morphology was analysed using scanning electron microscopy (SEM). These syntans were applied to leathers for making leather thermoresponsive. The thermal comfort range achieved on leathers prepared using the experimental syntan was about 2.5℃, compared to control of about 0.5℃ with an error of ±0.5℃. The physical and strength properties of experimental leathers were superior compared to control. Note de contenu : - MATERIALS AND METHODS : Materials - Syntan preparation - Leather application - Analysis of syntan - Analysis of leather - Strength property analysis - Organoleptic property analysis - RESULTS AND DISCUSSION : Solid content and particle size analysis - Scanning Electron Microscopy aAnalysis of syntan - Differential Scanning Calorimetry analysis of syntan - Infra-red thermal imaging leathers - Scanning electron microscopy anlaysis of leather - Physical strength analysis of leathers - Organoleptic property analysis of leathers - Table 1 : Detail description of leather processing - Table 2 : Thermal analysis of control and experimental leathers - Table 3 : Strength property analysis of control and experimental leathers DOI : https://doi.org/10.34314/jalca.v116i3.4248 En ligne : https://drive.google.com/file/d/1FTq1NucauDz-DFOooCMC6TOuyc3jXVA-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35435 [article]

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Effect of different unhairing methods on the ionic liquid based fiber opening process / Z. Mohammad Jamal Azhar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 6 (06/2016)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 6 (06/2016) . - p. 206-212 Titre : Effect of different unhairing methods on the ionic liquid based fiber opening process Type de document : texte imprimé Auteurs : Z. Mohammad Jamal Azhar, Auteur ; Gladstone Christopher Jayakumar, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Nishad Fathima Nishter, Auteur Année de publication : 2016 Article en page(s) : p. 206-212 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés organoleptiques Eaux usées -- Analyse Environnement -- Etudes d'impact Epilage Liquides ioniques Morphologie (matériaux) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather processing is known to impact the environment, especially the pre-tanning processes. Lime sludge is one of the major concerns for the industry. Application of ionic liquid (1- butyl 3- methylimidazolium chloride) instead of conventional reliming practice can reduce this problem to a large extent. In this study, the effect of different unhairing process on the fiber opening using ionic liquids has been studied. The extent of fiber opening was assessed for both control and experimental pelts through SEM analysis. The experimental pelts were found to have better fiber opening than the control. The ionic liquid fiber opened pelts were tanned and the spent liquors were assessed for the chrome content, COD, TDS. The results indicate that all the environmental parameters are better or on par with the conventional process. The final leathers made were also found to have physical characteristics similar to that of conventionally limed leathers. Note de contenu : - EXPERIMENTAL : Materials - Ionic liquid based fiber opening process - Morphological analysis - Physical characteristics - Spent liquor analysis - Organoleptic properties - RESULTS AND DISCUSSION : Effect of IL fiber opening on shrinkage temperature of leathers - Effect of IL opening on physical strength characteristics of leathers - Effect of IL fiber opening on fiber structure of leathers - Environmental impact analysis - Organoleptic properties - Significance of the study En ligne : https://drive.google.com/file/d/1SXoeTcMOxVlJGWn8TLuxIi2V5DQXDW7f/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26438 [article]

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Effect of syntan to fatliquor ratio on porosity and mechanical properties of wet-blue leather / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 4 (04/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 4 (04/2017) . - p. 121-127 Titre : Effect of syntan to fatliquor ratio on porosity and mechanical properties of wet-blue leather Type de document : texte imprimé Auteurs : Murali Sathish, Auteur ; T. S. Bhuvansewari, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Nishad Fathima Nishter, Auteur Année de publication : 2017 Article en page(s) : p. 121-127 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de moutons Morphologie (matériaux) Porosité Syntans Vêtements en cuir Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 668.5 Parfums et cosmétiques Résumé : Different types of leathers with varied end applications can be made from same raw material. Post-tanning is the operation, which imparts the functional properties required for the final leather. The amount of post-tanning auxiliaries such as syntan (S) and fatliquor (F) used in the leather making, make it possible to convert the same animal skin into various leather types. In this work, the sheep wet-blue has been converted into garment (S:F 1:2) and upper (S:F 2:1) leather by varying the S to F ratio. Here, an attempt has been made to study the influence of S to F ratio on the porosity and mechanical properties of garment/upper leather with respect to sheep wet-blue as a control. Thermoporometry results show that the reduction in pore distribution of garment leather with respect to wet-blue leather is about 62.3% and that of upper leather is 83%. Capillary flow porometry results show that the maximum distribution of through pore throat diameter of upper leather is found to be shifted towards 0.1-0.2 µm from 0.3-0.5 µm (wet-blue leather), whereas in the case of garment leather pores are uniformly distributed in the range of 0.1-0.5 µm. The influence of post-tanning auxiliaries on air permeability reduction is higher for upper leather (83%) than garment leather (41%). Morphological analysis using SEM shows that loosely packed arrangement of wet-blue leather becomes cemented fiber structure in case of upper leather and uniform fine fiber splitting has been observed for garment leather. Tensile strength of wet-blue leather is decreased by about 23% when it is converted into upper leather and that of garment leather is increased to about 16%. Note de contenu : - MATERIALS AND METHODS : Sampling for analysis of porosity - Sampling for analysis of mechanical properties - Thermoporometry analysis - Capillary flow porometry analysis - Scanning electron microscopic analysis - Mechanical properties - RESULTS AND DISCUSSION : Thermoporometry analysis - Capillary flow porometry analysis - Scanning electron microscopic analysis En ligne : https://drive.google.com/file/d/1Q1bFVx4FC4qMqE5wrJLTGhMdetf-ahHR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28361 [article]

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Fish skin and exotic leathers / Jaya Prakash Alla in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 2 (02/2017)  

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Ionic liquid functionalised nanoparticles based tanning system as a less chrome tanning approach / Inbasekar Chandrasekar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 1 (01/2021)  

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Thermal sensitive agents for making stimuli responsive leathers / Jaya Prakash Alla in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 12 (12/2020)  

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Valorisation of tannery waste and animal by-product for acoustics applications / Tesfay Gebryergs in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 6 (06/2021)  

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