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Coatings for medical application / Rohit Raj in PAINTINDIA, Vol. LVIII, N° 4 (04/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 4 (04/2008) . - p. 75-100 Titre : Coatings for medical application Type de document : texte imprimé Auteurs : Rohit Raj, Auteur Année de publication : 2008 Article en page(s) : p. 75-100 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens Biomatériaux Médecine -- Appareils et matériel Revêtements -- Emploi en thérapeutique Index. décimale : 667.9 Revêtements et enduits Résumé : Over the years, the use of coatings for medical devices and drug delivery has gone though a paradigm shift from being a rarity to being an absolute necessity. The latest generations of coatings have become indispensable in augmenting the capabilities of medical devices and implants. Without these coatings, many medical devices would never reach their true potential in the intended application. They impart a wide variety of properties such as lubricity, biocompatibility, and antimicrobial action to device surfaces. In addition to the above mentioned properties, coatings for medical devices are also being used extensively to carry out specific local drug release and make medical implants more visible to imaging systems. With the introduction ofdrug-eluting stents (DES), treatment of coronary artery disease has gone through a radical change, which resulted in improved success rates of a minimally-invasive surgery-an alternative to open heart surgery known as percutaneous transluminal coronary angioplasty (PTCA). DES, are basically mesh tubes coated with a slow release drug that helps to prevent coronary renarrowing of coronary artery after coronary angioplasty. As medicine moves further along the spectrum from invasive to non-invasive, device manufacturers increasingly demand slippery or lubricious coatings. Non-invasive procedures require slippery maneuverable catheters that physicians can move easily through small blood vessels or delicate tissue. With lubricious coatings on an increasing number of medical devices, surgeons can perform procedures that were impossible a decade ago. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8900 [article]

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Nitrogen doped TiO2 - A better additive for paints / Vaibhav Gaikwad in PAINTINDIA, Vol. LVIII, N° 4 (04/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 4 (04/2008) . - p. 101-108 Titre : Nitrogen doped TiO2 - A better additive for paints Type de document : texte imprimé Auteurs : Vaibhav Gaikwad, Auteur ; Niharika Jain, Auteur Année de publication : 2008 Article en page(s) : p. 101-108 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Additifs Azote Désodorisation Dioxyde de titane Odeurs -- Lutte contre Revêtements -- Additifs:Peinture -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : TiO2 is a much studied material for photocatalysis applications. Its large band gap makes it sensitive only to UV radiations. For much desired activation in the visible range and to extend their applications to living spaces with relatively poor interior lighting illumination, the band gap has to be tailored. A novel photocatalyst, N-doped TiO2 shows a significant improvement over TiO2 in photocatalytic activity under visible light. Photocatalytically active under visible light, N-doped TiO2, can be used as an additive in paints for interior walls of a room. Due to the photocatalytic activity it can decompose harmful organic substances reponsible for foul odor on absorption of visible light. Thus such paints can effectively function as a deodorizer for the room. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8987 [article]

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Dispersing agents. An indispensable additive / Mangesh I. Chaudhari in PAINTINDIA, Vol. LVIII, N° 4 (04/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 4 (04/2008) . - p. 109-128 Titre : Dispersing agents. An indispensable additive Type de document : texte imprimé Auteurs : Mangesh I. Chaudhari, Auteur Année de publication : 2008 Article en page(s) : p. 109-128 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie industrielle Dispersions et suspensions Revêtements -- Additifs:Peinture -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Dispersing is a basic requirement of many industries such as paints, textiles, pharmaceuticals, and food, etc. Every industry is using this dispersion phenomena for different reasons but, the main purpose of uniform dispersion is same i.e. Improvement in quality of product. In order to achieve this, plethora of dispersing agents are available in market, which are tailor-made according to the need of particular sector. Paint industry is a major consumer of dispersing agents, because many properties (stability, gloss, performance, etc.) are dependent on dispersion of pigment in binder system. Future trend in paint industry is shifting towards use of water based systems due to advent of concern awareness towards environmental issues, which requires extensive use of these dispersing agents in order to disperse non polar pigments in relatively polar systems. Similarly, uniform suspension of drug particles is basic requirement of pharmaceutical industry and uniform appearance of emulsified food products is very essential for food industry which is possible only with the use of dispersing agents. Their selection, use and performance are dependent on various parameters andhave efficacy to influence properties of final product. This article mainly ocvers various aspects of these dispersing agents which include their mechanism, types and role in paints and some other allied industries. Note de contenu : DISPERSING PROCESS : Wetting - Grinding - Stabilization / Electrostatic repulsion - Steric hindrance. SELECTION CRITERIA FOR DISPERSING AGENTS : HLB value - Chemical nature of dispersing agent - Biodegradability. PAINT INDUSTRY : Low and high molecular weight dispersing agents. COMMON ISSUES SOLVED BY DISPERSANTS : Haze - Pigment flocculation - Sedimentation - Floating or Bernard Cells - Rub up/flooding - Inhomogeneous color - Weather and chemical resistance. TEXTILE - FOOD - PHARMACEUTICALS - OTHER INDUSTRIAL APPLICATIONS. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8988 [article]

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Natural and accelerated weathering testing. The right choice / Smrithi Kumar in PAINTINDIA, Vol. LVIII, N° 4 (04/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 4 (04/2008) . - p. 143-164 Titre : Natural and accelerated weathering testing. The right choice Type de document : texte imprimé Auteurs : Smrithi Kumar, Auteur Année de publication : 2008 Article en page(s) : p. 143-164 Langues : Anglais (eng) Catégories : Essais accélérés (technologie) Revêtements -- Détérioration Index. décimale : 667.9 Revêtements et enduits Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8989 [article]

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A consumer guide to traditional and digital print stability / Image Permanence Institute (Rochester, United States) in PAINTINDIA, Vol. LVIII, N° 4 (04/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 4 (04/2008) . - p. 165-171 Titre : A consumer guide to traditional and digital print stability Type de document : texte imprimé Auteurs : Image Permanence Institute (Rochester, United States) , Auteur Année de publication : 2008 Article en page(s) : p. 165-171 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Encre d'imprimerie Impression en couleur Impression numérique -- Stabilité Index. décimale : 686.23 Impression Résumé : Color prints, not electronic files, are the best way to ensure that digital images will be preserved for future generations. Many options, including traditional photographic prints, are now available for producing color prints from digital images. When properly stored, dye-based inkjet and dye diffusion thermal transfer prints have stability comparable to that of traditional photographic prints. Pigment-based inkjet and color electrophotographic prints are even more stable. All technologies may be vulnerable to damage from light, air pollution, and improper handling. Understanding the differences between available technologies and proper storage of the resulting prints is the key to longlasting color prints. Note de contenu : COLOR PRINT TECHNOLOGIES : Traditional photographic prints /- Inkjet prints : Swellable paper - Porous paper - Dye diffusion thermal transfer prints - Electrophotographic prints Miscellaneous prints ENVIRONMENTAL FACTORS : Temperature and humidity - Gaseous pollutants - Water - Light - Mechanical damage. DISPLAY OPTIONS / STORAGE / HANDLING. CONSUMER CHOICES : Identification and selection of print types - Life-expectancy predictions. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8995 [article]

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