Collagen structure changes during chrome tanning in propylene carbonate / Yi Zhang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 1 (Année 2019)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 1 (Année 2019) . - 7 p. Titre : Collagen structure changes during chrome tanning in propylene carbonate Type de document : texte imprimé Auteurs : Yi Zhang, Auteur ; Jenna Kate Buchanan, Auteur ; Geoff Holmes, Auteur ; Bradley William Mansel, Auteur ; Sujay Prabakar, Auteur Année de publication : 2019 Article en page(s) : 7 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Carbonate de propylène Collagène -- Structure Cuirs et peaux Diffusion de la lumière aux petits angles Tannage au chrome Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Green solvents, such as propylene carbonate (PC), can be used in leather processing to improve the efficiency of chrome tanning and reduce wastewater. Here we report a combined small-angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC) study on PC and its efficacy as a carrier medium during chrome tanning. SAXS analysis on the collagen structure of chrome tanned leather using PC, compared to conventionally tanned leather using water, showed an increase in Cr uptake in addition to the more uniform penetration of Cr through the leather cross-section. The increased binding of Cr to the collagen matrix drives the decreased hydration environment of the collagen triple helix. Furthermore, DSC studies show a uniform hydrothermal stability for the PC samples due to the more even distribution of Cr through the collagen matrix. Understanding the mechanisms by which chrome tanning occurs in non-aqueous solvents can guide us towards a more sustainable future for the leather industry. Note de contenu : - EXPERIMENTAL : Materials - Leather sample preparation - Small-angle X-ray scattering (SAXS) measurements - Differential scanning calorimetry (DSC) measurements - Percentage uptake of chromium - RESULTS AND DISCUSSION : Chromium uptake from AAS studies - SAXS peak changes with tanning - D-period changes through the leather cross-section - Changes in R6/5 - DSC studies DOI : https://doi.org/10.1186/s42825-019-0011-y En ligne : https://link.springer.com/content/pdf/10.1186/s42825-019-0011-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36953 [article]

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Evaluation of antifungal activity of carbonate solvent - Part : 1 / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 11 (11/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 11 (11/2021) . - p. 390-394 Titre : Evaluation of antifungal activity of carbonate solvent - Part : 1 Type de document : texte imprimé Auteurs : Murali Sathish, Auteur ; D. Seeniammal, Auteur ; R. Poornima, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2021 Article en page(s) : p. 390-394 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antifongiques Carbonate de propylène Evaluation Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Antimicrobial agents have been used in leather manufacturing to prevent leather products from microbial contamination. In this work, the antifungal activity of green solvent such as propylene carbonate was investigated against the mixed culture of fungi isolated from wet-blue using broth dilution/well diffusion. A concentration of 5% and above (propylene carbonate) showed effective antifungal activity against the mixed culture of fungi and the efficiency of propylene carbonate on the mixed culture increased with increasing concentration/volume. Propylene carbonate exhibited fungistatic activity against the mixed culture of fungi but it lost its activity after a certain period and fungal growth was observed again. It was also found that 2% propylene carbonate in chrome tanning process effectively inhibited the fungal growth and the wet-blue can be preserved up to 30 days without any fungal attack. Note de contenu : - MATERIALS AND METHODS : Preparation of mixed stock culture - Evaluation of antifungal activity by Broth dilution method - Evaluation of antifungal activity by well-diffusion method of inhibition - Evaluation of antifungal efficiency on wet-blue - RESULT AND DISCUSSION : Preparation of stock culture - Evaluation of antifungal activity by Broth dilution method - Evaluation of antifungal activity by well-diffusion method - Mode of inhibition - Evaluation of antifungal efficiency on wet-blue DOI : https://doi.org/10.34314/jalca.v116i11.4661 En ligne : https://drive.google.com/file/d/1THUoSG6fM0HOWMx9LRRGG1FI0nEEGVBQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36576 [article]

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On the use of an internal mixer to study the impregnation of carbon fillers by organic liquids / Meral Akkoyun in APPLIED RHEOLOGY, Vol. 24, N° 1 (2014)

[article]  inAPPLIED RHEOLOGY > Vol. 24, N° 1 (2014) . - 8 p. Titre : On the use of an internal mixer to study the impregnation of carbon fillers by organic liquids Type de document : texte imprimé Auteurs : Meral Akkoyun, Auteur ; Christian Carrot, Auteur ; Benoît Blottière, Auteur Année de publication : 2014 Article en page(s) : 8 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carbonate de propylène Charbon actif Diméthylsulfoxyde Malaxeurs et mélangeurs Matériaux -- Imprégnation Rhéologie Index. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : lmpregnation of organic liquid electrolytes in conductive powders is of major importance in the field of energy storage devices such as batteries or super-capacitors. Impregnation during mixing and processing operations becomes usual for practical reasons and requires a better understanding of the changes of the rheological behavior of the mix. In this paper, the impregnation of propylene carbonate (PC) and dimethyl sulfoxide (DMSO) in activated carbon (AC) and carbon black (CB) was studied by using an internal mixer. Monitoring of the torque of the filler/liquid blend as a function of the amount of liquid fed in the mixing chamber, enables to detect the transition from the solid friction of the dry powder to the lubricated liquid (or viscous) behaviour of the concentrated paste of wetted powder. The results were compared with data obtained by conventional nitrogen adsorption porosimetry combined with the knowledge of the molecular diameter of the liquids. A characteristic change was observed as soon as the liquid completely fills the porosity of the filler. Both tested liquids (DMSO and PC) impregnate more carbon black and the take-up rate is slightly higher for DMSO in comparison to PC because, as a polar liquid, DMSO has a better interaction with both fillers. Note de contenu : - MATERIALS AND METHODS : Materials - Experiments - RESULTS AND DISCUSSION : Intrusion of DMSO and PC in activated carbon : results from internal mixer - Adsorption of DMSO and PC on activated carbon : results from nitrogen porosimetry - Adsorption of DMSO and PC on activated carbon : the transition from frictional to hydrodynamic regime - Intrusion of DMSO and PC in carbon black - Comparison of the intrusion of PC and DMSO in activated carbon and carbon black Référence de l'article : 13487 DOI : 10.3933/ApplRheol-24-13487 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21554 [article]

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Selective penetration enhancing system for acid dyes : more into hair and less into skin / Ei-ichi Nishizawa in IFSCC MAGAZINE, Vol. 4, N° 1 (01-02-03/2001)

[article]  inIFSCC MAGAZINE > Vol. 4, N° 1 (01-02-03/2001) . - p. 3-8 Titre : Selective penetration enhancing system for acid dyes : more into hair and less into skin Type de document : texte imprimé Auteurs : Ei-ichi Nishizawa, Auteur ; Hiroto Tanamachi, Auteur ; Takashi Mizooku, Auteur ; Susumu Oishi, Auteur ; Hiromi Shimogaki, Auteur ; Yoshinori Masukawa, Auteur ; Kunihiro Kokubo, Auteur Année de publication : 2001 Article en page(s) : p. 3-8 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Carbonate de propylène Cheveux -- Teinture Colorants Index. décimale : 668.5 Parfums et cosmétiques Résumé : A noble technology concerning a selective penetration of acid dyes has been developed in this study. By this technology, acid dye penetration into hair can be enhanced without enhancing into skin. It was found that acid dyes could penetrate into hair through only protein region (endocuticle) but could not penetrate into skin unless they diffuse into lipid region (intercellular lipids). A common penetration enhancer, benzyl alcohol (BA), acts on both proteins and lipids. That is the reason why skin is stained by acid dye solution with BA as a penetration enhancer. From the facts, it was predicted that the substance, which never acted on lipids but strongly acted on proteins, was suitable for the selective penetration enhancing system. We have found out that propylene carbonate (PC) satisfies the request and succeeded to develop the new selective penetration enhancing system with PC. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10745 [article]

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