Bitumen emulsion - A clean and safer solution for construction world / Anshika Sachan in PAINTINDIA, Vol. LXVII, N° 2 (02/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 2 (02/2017) . - p. 53-64 Titre : Bitumen emulsion - A clean and safer solution for construction world Type de document : texte imprimé Auteurs : Anshika Sachan, Auteur Année de publication : 2017 Article en page(s) : p. 53-64 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bitume Construction -- Matériaux Emulsions Formulation (Génie chimique) Index. décimale : 667.9 Revêtements et enduits Résumé : Today mankind has become increasingly dependent on road transport for both commercial and personal use. A major shift from water and rail based transport to roads bas been seen in UK, Europe and other developed nations. From many centuries it has been a trend to construct the road by using bitumen which is a dark or black coloured (solid/semi solid/viscous) material. But the handling of bitumen at ambient temperature is very difficult since it is a highly viscous material. lt can, however be transformed into a workable state by blending with petroleum solvents, leads to the emission of VOC, which is harmful to environment. Bitumen is net cost effective due to the increased sensitivity of the material to temperature and adverse weather condition. The maintenance cost for bitumen construction is also high. So scientists have thought about cost effective and environmentally friendly solution for construction work & bitumen emulsion is one of the outcomes of their innovative thought. This paper will discuss about Bitumen emulsions, its manufacturing techniques and their advantages over asphalt/bitumen in construction/pavementwork. Note de contenu : - INTRODUCTION : Bitumen - Chemical components in bitumen are : Water - kerosene (optional) - Emulsifier - Non-ionic emulsifier - Calcium chloride - Sodium tri polyphosphate - Adhesion promoters - Alsphalt peptizer - MANUFACTURING OF BITUMEN EMULSIONS : Process - Variables affecting emulsion quality - TYPES OF BITUMEN EMULSIONS : Cationic bitumen emulsion - Anionic bitumen emulsions - SETTING/BREAKING OF BITUMEN EMULSION : Slow setting emulsions - APPLICATION OF BITUMEN EMULSIONS : Surface dressing - Tack coats - Fog seal - Prime coat - Slurry seal and micro-surfacing - ADVANTAGES OF BITUMEN EMULSION - HEALTH, SAFETY AND ENVIRONMENTAL ASPECTS En ligne : https://drive.google.com/file/d/1NAwWxySwbMQSbD06lyclqdqaz_OLJveH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28440 [article]

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A paradigm shift from decorative to multifunctional coatings / Anshika Sachan in PAINTINDIA, Vol. LXVI, N° 5 (05/2016)  

[article]  inPAINTINDIA > Vol. LXVI, N° 5 (05/2016) . - p. 63-70 Titre : A paradigm shift from decorative to multifunctional coatings Type de document : texte imprimé Auteurs : Anshika Sachan, Auteur ; Sanjay Das, Auteur ; Rajeev Kumar Goel, Auteur Année de publication : 2016 Article en page(s) : p. 63-70 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Air intérieur Antimicrobiens Dépolluants Isolation acoustique Matériaux -- Propriétés fonctionnelles Matériaux piézoélectriques Revêtements décoratifs:Peinture décorative Index. décimale : 667.9 Revêtements et enduits Résumé : The 21st century has seen an evolution of surface coatings for fulfilling a more focused functional role, other than the conventional one of decoration and protection. These functional coatings are able to have properties which are innovative and impactful and can significantly contribute to improving living life environmental comfort level. Disturbance of domestic ambience by external chemical and biological intruder have a direct impact on general hygiene and safety. Although a significant progress has been made in modem science to tackle these problems, which is functional coatings. Here, some of the functional coatings will be discussed and their impact on human health, comfort, safety and hygiene. Introduction of functionalities is the key for developing coatings with desirable properties, for example nano particle and polymers having antimicrobial properties when incorporated in coatings can easily improve the overall hygiene there by health. In similar fashion Piezo electric materials, when applied to coatings can detect damage sites in buildings, thus, increasing the general safety. Furthermore, phase changing materials and coatings that can convert sunlight to electricity offers alternatives for maximizing output from natural resources providing a much sustainable environment. Note de contenu : - ANTI-MICROBIAL COATINGS : Ag nanoparticles - Nano magnesium oxide - Nano titanium di oxide - Polymeric N-halamide latex emulsion - SOUND DAMPENING : Porous sound absorbing materials - Ceramic hollow microspheres - Visco-elastic polymers - PIEZOELECTRIC PAINT/COATINGS : Working principles - Illustration of piezoelectric effect : piezoelectric materials - Advantages of piezoelectric paints - INDOOR AIR QUALITY CONTROL (POROUS CO-ORDINATION POLYMERS) : Absorption by porous polymers - Photo catalytic oxidation En ligne : https://drive.google.com/file/d/1zodE3Wmt7kNxKGAxA6qDaSi5C4H3hEpS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26844 [article]

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Recent trends in self-cleaning coatings / Anshika Sachan in PAINTINDIA, Vol. LXV, N° 4 (04/2015)  

[article]  inPAINTINDIA > Vol. LXV, N° 4 (04/2015) . - p. 53-66 Titre : Recent trends in self-cleaning coatings Type de document : texte imprimé Auteurs : Anshika Sachan, Auteur Année de publication : 2015 Article en page(s) : p. 53-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Composés inorganiques Dépôt chimique en phase vapeur Dioxyde de titane Electrochimie Electrofilature Electromouillage Gravure Hydrophilie Hydrophobie Nanoparticules Polymérisation Réactions chimiques Revêtement auto-nettoyant:Peinture auto-nettoyante Revêtements antigel Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Sol-gel, Procédé Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Nature has inspired scientists to create hydrophilic and hydrophobie paint surfaces. Considerable efforts have been made over the last few decades for developing self-cleaning surfaces exhibiting high contact angles for both polar and non-polar liquids. Self-cleaning coatings are becoming a requirement as integral part of our daily life because of their utility in various applications. Self-cleaning coatings are applied to maintain interior and exterior hygiene of the building structure and also in many automotive appliances. This paper is regarding various approaches in self-cleaning coatings like superhydrophilicity, superhydrophobicity and Omniphobicity. Nano TiO2 chemically breaks down organic dirt, adsorbed onto the surface. Dirt can be washed with water sheets due to superhydrophilicity. Superhydrophilicity is required for uniform cleaning of the surfaces. White superhydrophobic coatings impart water beading due to high contact angle which in tum keep surface clean. Omni phobie (omni: all ; phobie: repellent) due to very low surface tension value and surface morphology repel almost all types of liquids from paint surface. A broad range of applications of omniphobic coatings are : in Decorative & automotive field, permaclean cloths, anti-icing coatings for metals etc. Note de contenu : - BASICS OF SELF-CLEANING - HYDROPHOBIC COATINGS - THE LOTUS EFFECT - MECHANISMS TO PRODUCE SUPERHYDROPHOBIC SURFACES : Etching and chemical vapour deposition method - Wet chemical reaction and hydrothermal reaction - Electrochemical deposition - Sol-gel method and polymerization reaction - Electrospinning technique - Other techniques - Modification of rough surface with low surface energy materials : Silicones, fluorocarbons, organic materials, inorganic materials - FUNCTIONS OF HYDROPHOBIC SURFACES : Anti-icing - Electrowetting and other functions - PHOTOCATALYTIC HYDROPHILIC COATINGS : Materials to produce hydrophilic coatings : Titanium dioxide (TiO2, Improving TiO2, Improving TiO2 by doping, other materials) - NATURE'S CONTRIBUTION : Lotus leaf - Water strider legs - OMNIPHOBIC COATINGS : SLIPPERY LIQUID-INFUSED POROUS SURFACES En ligne : https://drive.google.com/file/d/1O9Wa0Let2_HpJBR9GAop4y73SDghnKk4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24154 [article]

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