Imperial College London
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ProfessorJoaoCabral

Faculty of Engineering, Department of Chemical Engineering

Professor of Soft Matter
 
 
 
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Contact

 

+44 (0)20 7594 5571j.cabral Website

 
 
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Assistant

 

Mrs Sarah Payne +44 (0)20 7594 5567

 
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Location

 

517AACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Udoh:2019:10.1039/c9sm00708c,
author = {Udoh, CE and Garbin, V and Cabral, JT},
doi = {10.1039/c9sm00708c},
journal = {Soft Matter},
pages = {5287--5295},
title = {Polymer nanocomposite capsules formed by droplet extraction: spontaneous stratification and tailored dissolution},
url = {http://dx.doi.org/10.1039/c9sm00708c},
volume = {15},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We report the formation of polymeric and nanocomposite capsules via droplet solvent extraction, focusing on the interplay between solvent exchange and removal, demixing and directional solidification kinetics. We investigate a model system of sodium poly(styrene sulfonate), NaPSS and silica nanoparticles in aqueous solution, whose phase behaviour is experimentally measured, and examine a series of selective extraction solvents (toluene, butyl acetate, ethyl acetate and methyl ethyl ketone), ranging from 0.04 to 11% v/v water solubility. Tuning the rate of solvent exchange is shown to provide an effective means of decoupling demixing and solidification timescales, and thereby tunes the internal microstructure of the capsule, including hollow, microporous, core–shell, and bicontinuous morphologies. In turn, these determine the capsule dissolution mechanism and kinetics, ranging from single to pulsed release profiles of nanoparticle clusters (at intermediate solubilities), to minimal dissolution (at either extremes). These findings provide facile design and assembly strategies for functional capsules with time-varying release profiles.
AU  - Udoh,CE
AU  - Garbin,V
AU  - Cabral,JT
DO  - 10.1039/c9sm00708c
EP  - 5295
PY  - 2019///
SN  - 1744-683X
SP  - 5287
TI  - Polymer nanocomposite capsules formed by droplet extraction: spontaneous stratification and tailored dissolution
T2  - Soft Matter
UR  - http://dx.doi.org/10.1039/c9sm00708c
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000474288400009&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/75979
VL  - 15
ER  -
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