[article]
| Titre : |
Silica aerogel : a comprehensive review on its synthesis, properties and role in designing thermal insulation coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Narayani Rajagopalan, Auteur ; Chinmaya Nayak, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 66-86 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Aérogels
Angle de contact
Composés inorganiques -- Synthèse
Construction -- Matériaux
Diffusivité thermique
Dioxyde de silicium
Gel de silice
Isolants thermiques
Micrographie
Revêtements
Thermocinétique
TransmittanceLa transmittance, en général, est le rapport caractérisant la transmission d'une grandeur dans un système. Elle se calcule par le rapport entre la grandeur en entrée et en sortie.
En optique, la transmittance d'un matériau ou d'un filtre est la fraction du flux lumineux le traversant. Elle est également nommée facteur de transmission mais aussi transparence dans le domaine de la photographie.
Vitrage
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Aerogels due to its nano-sized porous structure possess extremely low density (~0.003 g/cm3)10mW/mK) and solids with high porosity very low conductivity (~10mW/mK). Silica aerogel namely, has found profound interest among researchers and has been extensively studied for their thermal, mechanical and hydrophobic properties. They have 90% porosity with a thermal conductivity lower than that of air, and this makes silica aerogel an important media for conceptualising it as a highly insulating material. The present review focuses the various work done on silica aerogel based coatings and the functionality of silica aerogel as an insulating material. |
| Note de contenu : |
- SYNTHESIS AND PROPERTIES OF SILICA AEROGEL : Synthesis - Precursors for sol-gel synthesis of silica aerogel - Aging of aerogel - Drying of aerogel - Characteristic properties of silica aerogel
- DESIGN ASPECT FOR DEVELOPMENT OF SILICA AEROGEL BASED INSULATION COATING SYSTEMS : Building applications - Window glazings
- Fig. 1 : Aerogel structure network and SEM micrographs of carbon and silica aerogel
- Fig. 2 : Step-wise synthesis route of aerogel
- Fig. 3 : SEM and TEM micrographs of silica aerogel
- Fig. 4 : Thermal and solar properties of HILIT/HILIT + aerogel glazing (15mm aerogel) compared with typical commercially availagle low-energy glazing
- Fig. 5 : SEM micrographs of the aerogel films : 80 nm thick xerogel, 160 nm thick aerogel, 340 nm thick aerogel and 480 nm thick aerogel (dip-coating method). SEM micrographs of the aerogel films : 1 lm thick aerogel, 2 lm thick aerogel, and 10 lm thick aerogel (multiple spin-coating)
- Fig. 6 : Transmittance of the silica aerogel coatings modified with PEG : 0, 10, 20, 30 and 40 wt%, respectively
- Fig. 7 : Surface temperature of insulation coatings at 75 mils DFT on steel heated to 180 F
- Fig. 8 : Panels coated with insulation coatings, after 2016 hours of salt spray exposure
- Fig. 9 : Contact angle of unmodified SiO2 and modified SiO2 aerogel
- Fig. 10 : Change curve of temperature for different mass fraction of SiO2 aerogel coatings
- Fig. 11 : Change curve of thermal conductivity in different mass fraction of SiO2 aerogel coatings
- Fig. 12 : Cross-sectional micrographs of the YSZ, ScYSZ coatings and silica aerogel composites
- Fig. 13 : Thermal diffusivities for YSZ, ScYSZ and SiO2 ceramic fiber aerogel composites and heating temperature curves of outer titanium surface and inter coatings surface versus time
- Fig. 14 : Temperature of sample coatings vs. coating thickness curve
- Fig. 15 : TGA and DTA graph of A1 and A1 with 5% silica aerogel
- Fig. 16 : Schematic diagram of home-made setup for heat transfer analysis
- Fig. 17 : Comparison of TC reduction rates for the coatings under study |
| En ligne : |
https://drive.google.com/file/d/13dB3eGVZzeBg5jg7TpZBbNInxY3Erhzf/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33635 |
in PAINTINDIA > Vol. LXIX, N° 11 (11/2019) . - p. 66-86
[article]
|
Aller sur edunet
Accueil
Silica aerogel : a comprehensive review on its synthesis, properties and role in designing thermal insulation coatings in PAINTINDIA, Vol. LXIX, N° 11 (11/2019)
