Application of fringe field capacitance sensor for the study of water permeation in organic coatings / K. A. Thomas in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 829-835 Titre : Application of fringe field capacitance sensor for the study of water permeation in organic coatings Type de document : texte imprimé Auteurs : K. A. Thomas, Auteur ; Shiny Nair, Auteur ; A. V. Ramesh Kumar, Auteur ; V. Natarajan, Auteur ; Reji John, Auteur Année de publication : 2016 Article en page(s) : p. 829-835 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Capteurs (technologie) Perméation Revêtements -- Analyse:Peinture -- Analyse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Water permeation in organic coatings can be monitored by measuring the capacitance change in coatings. A new method of measuring water content in organic coatings using a miniature fringe field capacitance (FFC) sensor is described in this paper. The FFC sensor comprises two planar interdigitated electrodes on a dielectric substrate which is connected to a measuring circuit. Coating capacitance is measured by measuring the sensor capacitance when it is in contact with the surface of the coating. Sensor capacitance is theoretically calculated based on IDC capacitor theory for various sensor geometrical parameters at different water ingression levels in the coating. The computed sensor capacitance is validated with experimental values of five miniature sensors which are fabricated by lithography. The calibrated FFC sensor is used to monitor the water permeation profile in the coating, and the results are compared with that of electrochemical impedance spectroscopy technique. The technique provides scope for developing a portable, hand-held, and noninvasive technique to measure water permeation in organic coatings in the field. Note de contenu : - APPLICATION OF FFC SENSOR FOR MEASURING WATER CONTENT IN THE COATING : THEORETICAL STUDY - FABRICATION OF SENSOR AND VALIDATION OF THEORY : Sensor fabrication - Experimental validation of theory - WATER PERMEATION STUDY IN THE COATING DOI : 10.1007/s11998-016-9795-3 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9795-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27122 [article]

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Biosynthesis of a UV stable pigment : prodigiosin / V. Natarajan in PAINTINDIA, Vol. XLV, N° 10 (10/1995)

[article]  inPAINTINDIA > Vol. XLV, N° 10 (10/1995) . - p. 23-33 Titre : Biosynthesis of a UV stable pigment : prodigiosin Type de document : texte imprimé Auteurs : V. Natarajan, Auteur ; P. K. Kamath, Auteur Année de publication : 1995 Article en page(s) : p. 23-33 Note générale : Glossaire - Bibliogr. Langues : Anglais (eng) Tags : Biosynthèse  Pigment  Prodigiosine  'Serratia  marcescens'  'Culture  de  microorganismes'  Mutagenèse  Optimisation  'Zinc  II  Ion'  Mutation  'Cobalt  'Milieu  culture'  'Nickel  'Elément  trace'  'Fer  Nutriment  'Titane  'Irradiation  UV'  'Molybdène  Enterobacteriaceae  Bactérie Index. décimale : 667.9 Revêtements et enduits Résumé : Pigment Prodigiosin is red maroon in colour and has a pyrrye dipyrryl methene structure. It is water insoluble and occurs membrane bound in the cells of Serratia marcescens, which is gram negative bacterium. As the parent strain of Serratia marcescens NRRL B284 was found to be unstable in its pigment synthesising ability, an attempt was therefore made to derive UV stable mutants employing UV induced mutagenesis. Out of seven mutants derived, a lone mutant designed M2 was found to be most promising both in terms of stable pigment producing characters as well as faster growth rates in select synthetic medium compared to the rest of the mutants. Studies on mutant M2 constitue optimisation of Carbon:Nitrogen ratio in the synthetic medium selected, followed by studies on feeding salts of trace cations during cell cultivation (as nutrient modifiers) to explore further (if any), scope for improving the UV stability of the pigment synthesised. The role/contribution towards UV stability by trace cations e.g. Mo++, Ti++, Fe++, Ni++, Co++ and Zn++ were investigated. Select UV stable pigments were evaluated for their performance in two types of air drying paints, with intersting results with respect to colour and gloss retention Note de contenu : HISTORY OF PROIDOGIOSIN - SCOPE OF CURRENT WORK - MATERIAL AND METHODS - EXPERIMENTAL : Culture maintenance and inoculum preparation - Screening of media for pigment production - Optimisation of carbone : nitrogen ratio for pigment synthesis - Cell harvesting, determination of biomass, pigment extraction - Chromatographic analysis of pigment - Reversion to chromogenic variants - Role of oxygen - Straint improvement through UV mutagenesis - Screening of salts of trace cations as nutrient modifiers - Pigment screening for uv stability - Prodigiosin for paint application - RESULTS AND DISCUSSION : Reversion to chromogenic variants - UV induced mutagenesis and effect of mutation - Effect of oxyten - Effect of optimising carbon : nitrogen in synthetic medium for mutant M2 - Composition of MSM - Effect of trace cations on UV stability of pigment - Performance of prodigiosin in paints - IR interpretation Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13665 [article]

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