| Titre : |
A surfactant-free microfluidic process for fabrication of multi-hollow polyimide aerogel particles |
| Type de document : |
texte imprimé |
| Auteurs : |
Y. M. Yao, Auteur ; P. Joo, Auteur ; Sadhan C. Jana, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 481–492 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Aérogels
Caractérisation
Corps creux
Granulométrie
Isolation thermique
Microfluidique
Particules (matières)
Polyimides
Polymères en émulsion
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
This work focuses on fabrication of multi-hollow polyimide gel and aerogel particles from a surfactant-free oil-in-oil emulsion system using a microfluidic droplet generator operating under dripping mode. The multi-hollow gel and aerogel particles have strong potential in thermal insulation. Under jetting and tip-streaming regime of microfluidic flows, droplets are generated with no occluded liquid phase. The present study investigates a means of designing polyimide gel particles with plurality of internal liquid droplets by strategically manipulating the flow rates of the continuous and dispersed phase liquids through the microfluidic droplet generator. The multi-hollow polyimide aerogel particles obtained after supercritical drying of the gel particles present mesopores, high BET surface area, and excellent prospect for thermal insulation. |
| Note de contenu : |
- EXPERIMENTAL SECTION : Materials - Preparation of polyimide sol - Preparation of the multi-hollow polyimide aerogel particles - Characterization of multi-hollow polyimide aerogel particles
- RESULTS AND DISCUSSION : Role of the ratio Qd and Qc on droplet generation - Gel and aerogel particle size distributions - The morphology of multi-hollow polyimide aerogel particles - The time window for droplet generation - Analysis of polyimide droplet formation with multiple internal droplet inclusions - Monitoring of imidization and thermal properties - Surface area and porosity - Thermal insulation |
| DOI : |
https://doi.org/10.3139/217.3989 |
| En ligne : |
https://drive.google.com/file/d/17Bcp9-Rsz-2U-UVpLOr-RvQ4MChCOZO5/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35070 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 5 (11/2020) . - p. 481–492
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