Please use this identifier to cite or link to this item: http://hdl.handle.net/10216/103626
Author(s): Joana Fidalgo
Angela dias
Adelio M Mendes
Fernao D Magalhaes
Title: Production of monodisperse multivesiculated polyester particles with a T-junction microfluidic device
Issue Date: 2013
Abstract: Production of monodisperse multivesiculated particles (MVPs) of polyester reticulated with styrene was studied using a T-junction device for droplet generation. The process is based on a w/o/w double emulsion, which after crosslinking and drying yields solid particles filled with closely packed microvoids. The effect of continuous and dispersed phase flow rates, protective colloid concentration, and temperature on droplet size was studied. SEM analysis of internal morphology of particles produced using a one-step double emulsification process indicated that vesiculation was sparse and mostly located in the particle outer layer. This was attributed to the long time needed for water diffusion to fill-in the organic droplets. Much better results were obtained using a two-step emulsification process, in which water was pre-emulsified in the organic phase, and the final double emulsion was generated in the T-junction. Monodisperse particles with uniform vesiculation throughout the entire core were obtained in this way. The pre-emulsion was observed to be more stable when using triethanolamine instead of diethylenetriamine as w/o stabilization promoter, allowing for continuous production for longer runs.
Subject: Engenharia química
Chemical engineering
URI: http://hdl.handle.net/10216/103626
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-EQU/112151/2009/Sistema microfluído para síntese de partículas vesiculadas/PTDC/EQU-EQU/112151/2009
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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