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The nano building blocks approach for modification of surface properties of nanocomposite inorganic-organic films / Jana Pagacova in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)
[article]
Titre : The nano building blocks approach for modification of surface properties of nanocomposite inorganic-organic films Type de document : texte imprimé Auteurs : Jana Pagacova, Auteur ; Iveta Papucova, Auteur ; Alfonz Plsko, Auteur ; Katarina Faturikova, Auteur Année de publication : 2022 Article en page(s) : p. 1139-1147 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Caractérisation
Dip-coating
Hydrophobie
Matériaux hybrides
Morphologie (matériaux)
Nanoparticules
Sol-gel, Procédé
Taille des particulesIndex. décimale : 667.9 Revêtements et enduits Résumé : This work deals with utilization of nano building blocks (NBBs) approach for modification of properties of nanocomposite inorganic-organic films. Using the NBBs approach and acid-catalyzed reactions of tetraethoxysilane and triethoxy(octyl)silane, different procedures were used for preparation of six sols. Besides three different ways of mixing of initial precursors, two temperatures with different reaction time were used. The films were prepared by dip-coating technique and treated at temperature of 170°C. The sols were characterized by method of dynamic light scattering. The surface of films was characterized by atomic force microscopy and sessile drop technique. The influence of sol preparation procedure and reaction conditions on particles size in sols as well as the properties of films surface, such as hydrophobicity, morphology and rms-roughness, was observed. The procedure of sol preparation markedly influences the surface morphology of prepared nanocomposite inorganic-organic films. The changes in the studied properties were mainly observed for films, which were deposited from sols prepared at boiling temperature of isopropyl alcohol. Note de contenu : - EXPERIMENTAL : Preparation of sols - Preparation of films - Characterization
- RESULTS AND DISCUSSION : Particles size in sol - Contact angle of water - AFMDOI : https://doi.org/10.1007/s11998-021-00592-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00592-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38042
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1139-1147[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23574 - Périodique Bibliothèque principale Documentaires Disponible The non-collagenous proteins of skin - Their characterisation and significance in leather processing / G. A. Balian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 5 (05/1970)
[article]
Titre : The non-collagenous proteins of skin - Their characterisation and significance in leather processing Type de document : texte imprimé Auteurs : G. A. Balian, Auteur ; J. H. Bowes, Auteur Année de publication : 1970 Article en page(s) : p. 171-182 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides aminés Les acides aminés (ou aminoacides) sont une classe de composés chimiques possédant deux groupes fonctionnels : à la fois un groupe carboxyle –COOH et un groupe amine –NH2. Parmi ceux-ci, les acides α-aminés se définissent par le fait que leur groupe amine est lié à l'atome de carbone adjacent au groupe acide carboxylique (le carbone α), ce qui leur confère la structure générique H2N–CHR–COOH, où R représente la chaîne latérale, qui identifie l'acide α-aminé.
Les acides α-aminés jouent un rôle fondamental en biochimie comme constituants élémentaires des protéines : ils polymérisent en formant des liaisons peptidiques qui aboutissent à de longues chaînes macromoléculaires appelées peptides.
Caractérisation
Cuirs et peaux de veaux
Extraction (chimie)
ProtéinesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The composition of the skin and the variations in the relative amounts of collagen and non-collagenous proteins in the skin with the type of animal, age and nutritional level are considered.
The non-collagenous protein shave been divided into four fractions on the basis of solubility and ease of extraction from skin. About 30% of the non-collagenous protein is extracted by phosphate buffer at pH 9.0 and by neutral salt solutions, a further "à ù by dilute alkali, pH 12.5, and the remaining 30% or so remains in association with the insoluble collagen. Ten to twenty per cent non-collagenous protein dissolves in acetic acid together with acid-soluble collagen.
The non-collagenous protein extracted by phosphate buffer, dilute alkali and acetic acid have been analysed for amino acid composition and examined by ion exchange and molecular sieve chromatography and acrylamide gel electrophoresis. The protein extracted by phosphate buffer has been shown to consist primarily of plasma proteins and is considered to arise from the blood supply and no have no function specific to skin.
The non-collagenous proteins extracted by acid and alkali differ in amino acid composition. Each canbe separated into a major and several minor components by acrylamide gel electrophoresis but few, if any, of these appear to be common to both extracts. The major component of the alkaline extract if of high molecular weight and is closely associated with the collagen. It represents a high proportion of the total non-collagenous protein of skin. The acid-soluble fraction is also closely associated with the collagen ; it contains an excess of acidic residues and is probably bound to the collagen by electrostatic forces.
The results as a whole demonstrate that thematrix of skin consists of a complex system of non-fibrous proteins, some of which are difficult to remove from association with collagen and vice versa. Their possible function in the stabiilisation of skin structure is examined.
These findings and recent advances in our knowledge of the structure and properties of collagen are discussed in relation to leather processing.Note de contenu : - Composition of skin
- Characterisation of the non-collegenous protein : Extraction - Alkaline extract - Acetic acid extracts - Insoluble protein
- Function of the non-collagenous proteins
- Implications in leather processing
- Table 1 : Protein extracted from calf skin - Percentage of total skin protein
- Table 2 : Amino acid composition of non-collagenous protein fractions extracted from calf skinEn ligne : https://drive.google.com/file/d/1hIXcYHobRfD93QNnMdzYjNzz-3nDaEIN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37002
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 54, N° 5 (05/1970) . - p. 171-182[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007082 - Périodique Bibliothèque principale Documentaires Disponible The novel synthesis and characterisation of hydroxyapatite and its application in leather making / Y. Z. Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 4 (07-08/2018)
[article]
Titre : The novel synthesis and characterisation of hydroxyapatite and its application in leather making Type de document : texte imprimé Auteurs : Y. Z. Wang, Auteur ; Wang Shuai, Auteur ; Z. H. Shan Année de publication : 2018 Article en page(s) : p. 181-186 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Collagène
Composés inorganiques -- Synthèse
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de bovins
HydroxyapatiteL'hydroxyapatite est une espèce minérale de la famille des phosphates, de formule Ca5(PO4)3(OH), usuellement écrite Ca10(PO4)6(OH)2 pour souligner le fait que la maille de la structure cristalline comprend deux molécules. L'hydroxyapatite est le membre hydroxylé du groupe apatite. L'ion OH- peut être remplacé par le fluor, le chlore ou le carbonate.
L'hydroxyapatite cristallise dans le système hexagonal. La poudre d'hydroxyapatite pure est blanche. Celles que l'on trouve dans la nature peuvent cependant être de couleur marron, jaune ou verte.
Stabilité thermique
Tannage
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Température de retraitIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Hydroxyapatite(HAP) has been extensively used in clinics for such as bone tissue repair because of its outstanding performance. But, whether HAP can be utilized in other fields still remains unknown, for example leather making. In the present work HAP was synthesized using a hydrothermal method with diammonium hydrogen phosphate and calcium nitrate as phosphorus and calcium precursors respectively. The Fourier transform infrared spectroscopy analysis of products shows that HAP can be produced using the wet-chemical method. The condition optimization test results indicated that high purity HAP can be obtained when the reaction was carried out at 80°C and pH11 with surfactant added and ultrasonic treatment for 8 hours. To study the effect of HAP on cow hide and whether it can be used as tanning agent, vitro and vivo tests of adding HAP into cow hide were conducted. The cow hide was first treated in the wet end process of leather making and then cut into several parts. The parts were treated using different HAP addition methods and the experimental results were compared under different conditions. Fourier transform infrared spectroscopy analysis indicated that HAP can react with the cow hide using both methods. Cow hide physicochemical properties were improved after reaction with HAP, the thermal stability was especially enhanced. The thermal shrinkage temperature of the treated hide was 78°C which was higher than the sample in the control group of 54°C. The hide tensile strength was greatly enhanced because HAP penetrated into the hide and reacted on hide collagen. So, HAP has the potential to be used as chrome-free tannage. This meant that the modification of cow hide by HAP was feasible and HAP tannage or HAP combination tannage was of practical significance. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and equipement - HAP preparation - Tests of effects of HAP on hide collager
- RESULTS AND DISCUSSION : Characterization of HAP - Effect of HAP on collagenEn ligne : https://drive.google.com/file/d/19F1wl7LIKX9CFp8lVYdVfCN1OaO_9-Zr/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30900
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 4 (07-08/2018) . - p. 181-186[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20126 - Périodique Bibliothèque principale Documentaires Disponible The preparation and application of a montmorillonite-based nanocomposite in leather making / Jianzhong Ma in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 4 (07-08/2003)
[article]
Titre : The preparation and application of a montmorillonite-based nanocomposite in leather making Type de document : texte imprimé Auteurs : Jianzhong Ma, Auteur ; Xinjiang Chen, Auteur ; Yun Chu, Auteur ; Zongsui Yang, Auteur Année de publication : 2003 Article en page(s) : p. 131-134 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption
Adsorption
Caractérisation
Eaux usées -- Epuration
Huiles et graisses
Maroquinerie
Matériaux -- Modifications chimiques
Montmorillonite
Sels d'ammonium
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Montmorillonite (MMT) has been modified with a long chain quaternary ammonium salt through a cation exchange reaction. The extent of the exchange was characterised by XRD (X-ray Diffraction), FT-IR (Fourier Transform Infrared Spectroscopy) and by the determination of CEC (Cation Exchange Capacity).The results prove that alkylammonium ions have taken the place of Na+ ions in Na+ - Montmorillonite (Na-MMT) and that the inter-laminar distance has been enlarged.
The possibility of using Na-MMT and organic-montmorillonite (O-MMT) in the treatment of wastewater from tanneries by utilizing their adsorption properties has been studied. The result shows that Na-MMT and O-MMT can absorb fatliquors to a certain extent.
A series of tanning experiments have been carried out to compare the tanning properties of Na-MMT, O-MMT and O-MMT/Cr3+. The results suggest that Na-MMT and O-MMT have some tanning capability, and that the composite O-MMT/Cr3+ with a very low content of Cr3+ can produce leather of light colour with a shrinkage temperature above 90oC.Note de contenu : - EXPERIMENTAL PROCEDURE :
- Preparation of organic-MMT
- Organic modification of MMT
- Sorption of grease from waste water by Na-MMT and O-MMT
- TANNING WITH NA-MMT AND O-MMT :
- General procedure for tanning
- TANNING WITH O-MMT/CR3+ COMPOSITE :
- Preparation of O-MMT/Cr3+ composite
- RESULTS AND DISCUSSIONS :
- Analysis of CEC, FT-IR and XRD of O-MMT
- Results of sorption of grease in waste water by Na-MMT and O-MMT
- Results of Tanning with Na-MMT and O-MMT
- Table 1 : CEC results for O-MMT
- Table 2 : Results of sorption of grease in waste water by Na-MMT and O-MMT
- Table 3 : Shrinkage temperatures of different tannages
- Table 4 : Thickness increment ratio for different tannages
- Table 5 : Shrinkage temperature of different tannagesEn ligne : https://drive.google.com/file/d/1pTRjBEUgi5rzRX5SyWaG1WAIhJvVgRML/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39767
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 4 (07-08/2003) . - p. 131-134[article]The preparation and application of a nanocomposite tanning agent-MPNS-SMA / Hui Pan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 4 (07-08/2005)
[article]
Titre : The preparation and application of a nanocomposite tanning agent-MPNS-SMA Type de document : texte imprimé Auteurs : Hui Pan, Auteur ; Zhijun Zhang, Auteur ; Juxian Zhang, Auteur ; Hongxin Dang, Auteur Année de publication : 2005 Article en page(s) : p. 153-156 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage
Caractérisation
Copolymère styrène acide maléique
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux de moutons
Dioxyde de silicium
Matériaux hybrides
Méthacryloxypropyltriméthoxysilane
Nanoparticules
Peroxyde de benzoyle
Réaction de couplage
Retannage
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : r-Methacryloxy propyltrimethoxysilane (MPTMS) was used as a coupling agent to introduce vinyl groups onto the surface of nano SiO2. A nanocomposite of MPNS/SMA was prepared by the polymerization of methacryloxypropyl nano SiO2 (MPNS), styrene (ST) and maleic anhydride (MA) with benzoyl peroxide (BPO)as initiator in toluene. The structure of the MPNS/SMA nanocomposite was characterized by FT-IR (Fourier Transform Infrared Spectroscopy) and TEM (Transmission Electron Microscope).
A series of tanning experiments have been carried out to compare the tanning and retanning properties of MPNS/SMA and styrene-maleic anhydride copolymer (SMA). The results show that MPNS/SMA has good tanning capability, and that leather treated with the MPNS/SMA nanocomposite is of good quality.Note de contenu : - EXPERIMENTAL PROCEDURES : Chemicals and instrumentation - Preparation of MPNS/SMA nanocomposite
- TANNING WITH MPNS/SMA NANOCOMPOSITE AND SMA COPOLYMER : General procedure for tanning - Retanning with MPNS/SMA, SMA and chrome tanning agent - Comparison application experiment with MPNS/SMA nanocomposite
- RESULTS AND DISCUSSION : The analysis of MPNS/SMA and MPNS by FT-IR and TEM - Results of application comparison experiments
- Table 1 : Retanning process of blue sheep leather treated with MPNS/SMA, SMA and chrome powder
- Table 2 : Results of tanning with MPNS/SMA and SMA
- Table 3 : Results of physical-mechanical testing of retanned leathers - 3 types of retannage (1% offer)
- Table 4 : Results of physical-mechanical testing of retanned leathers - 3 types of retannageEn ligne : https://drive.google.com/file/d/12oiH2T8TpaGXv-Avk7IChXfn_-s8soG_/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39250
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 4 (07-08/2005) . - p. 153-156[article]The preparation and characterization of abrasion-resistant coatings on polycarbonate / Yu-Hong Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 1 (01/2013)
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