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Micromachines 2018, 9(1), 24;

On-Chip Facile Preparation of Monodisperse Resorcinol Formaldehyde (RF) Resin Microspheres

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
Authors to whom correspondence should be addressed.
Received: 6 December 2017 / Revised: 26 December 2017 / Accepted: 8 January 2018 / Published: 12 January 2018
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Monodisperse resorcinol formaldehyde resin (RF) microspheres are an important polymeric material because of their rich surface functional group and uniform structural characteristics and have been increasingly applied as an electrode material, catalyst support, absorbent, and carbon microsphere precursor. The polymerization conditions, such as the gelation/solidification temperature and the residence time, can largely influence the physical properties and the formation of the 3D polymeric network of the RF microspheres as well as the carbon microspheres. However, few studies have reported on the complexity of the gelation and solidification processes of resol. In this work, we developed a new RF microsphere preparation device that contains three units: a droplet generation unit, a curing unit, and a collection unit. In this system, we controlled the gelation and solidification processes of the resol and observed its curing behavior, which helped us to uncover the curing mechanism of resol. Finally, we obtained the optimized polymerization parameters, obtaining uniform RF microspheres with a variation coefficient of 4.94%. The prepared porous RF microspheres presented a high absorption ability, reaching ~90% at 10 min. Thus, our method demonstrated the practicality of on-chip monodisperse microspheres synthesis. The product was useful in drug delivery and adsorbing large poisonous molecules. View Full-Text
Keywords: microfluidics; monodisperse; microsphere; resol; curing microfluidics; monodisperse; microsphere; resol; curing

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Wang, J.; Huang, X.; Zhao, P.; Wang, X.; Tian, Y.; Chen, C.; Wang, J.; Li, Y.; Wan, W.; Tian, H.; Xu, M.; Wang, C.; Wang, L. On-Chip Facile Preparation of Monodisperse Resorcinol Formaldehyde (RF) Resin Microspheres. Micromachines 2018, 9, 24.

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