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Costa E, Coelho M, Ilharco LM, Aguiar-Ricardo A, Hammond PT. "Tannic acid mediated suppression of PNIPAAm microgels thermoresponsive behavior." Macromolecules. 2011;44(3):612-621. AbstractWebsite
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Costa E, De-Carvalho J, Casimiro T, da Silva CL, Cidade MT, Aguiar-Ricardo A. "Tailoring thermoresponsive microbeads in supercritical carbon dioxide for biomedical applications." Journal of Supercritical Fluids. 2011;56(3):292-298. AbstractWebsite
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Costa E, Lloyd MM, Chopko C, Aguiar-Ricardo A, Hammond PT. "Tuning Smart Microgel Swelling and Responsive Behavior through Strong and Weak Polyelectrolyte Pair Assembly." LangmuirLangmuir. 2012;28(26):10082-10090. AbstractWebsite

The layer-by-layer (LbL) assembly of polyelectrolyte pairs on temperature and pH-sensitive cross-linked poly(N-isopropylacrylamide)-co-(methacrylic acid), poly(NIPAAm-co-MAA), microgels enabled a fine-tuning of the gel swelling and responsive behavior according to the mobility of the assembled polyelectrolyte (PE) pair and the composition of the outermost layer. Microbeads with well-defined morphology were initially prepared by synthesis in supercritical carbon dioxide. Upon LbL assembly of polyelectrolytes, interactions between the multilayers and the soft porous microgel led to differences in swelling and thermoresponsive behavior. For the weak PE pairs, namely poly(l-lysine)/poly(l-glutamic acid) and poly(allylamine hydrochloride)/poly(acrylic acid), polycation-terminated microgels were less swollen and more thermoresponsive than native microgel, whereas polyanion-terminated microgels were more swollen and not significantly responsive to temperature, in a quasi-reversible process with consecutive PE assembly. For the strong PE pair, poly(diallyldimethylammonium chloride)/poly(sodium styrene sulfonate), the differences among polycation and polyanion-terminated microgels are not sustained after the first PE bilayer due to extensive ionic cross-linking between the polyelectrolytes. The tendencies across the explored systems became less noteworthy in solutions with larger ionic strength due to overall charge shielding of the polyelectrolytes and microgel. ATR FT-IR studies correlated the swelling and responsive behavior after LbL assembly on the microgels with the extent of H-bonding and alternating charge distribution within the gel. Thus, the proposed LbL strategy may be a simple and flexible way to engineer smart microgels in terms of size, surface chemistry, overall charge and permeability.The layer-by-layer (LbL) assembly of polyelectrolyte pairs on temperature and pH-sensitive cross-linked poly(N-isopropylacrylamide)-co-(methacrylic acid), poly(NIPAAm-co-MAA), microgels enabled a fine-tuning of the gel swelling and responsive behavior according to the mobility of the assembled polyelectrolyte (PE) pair and the composition of the outermost layer. Microbeads with well-defined morphology were initially prepared by synthesis in supercritical carbon dioxide. Upon LbL assembly of polyelectrolytes, interactions between the multilayers and the soft porous microgel led to differences in swelling and thermoresponsive behavior. For the weak PE pairs, namely poly(l-lysine)/poly(l-glutamic acid) and poly(allylamine hydrochloride)/poly(acrylic acid), polycation-terminated microgels were less swollen and more thermoresponsive than native microgel, whereas polyanion-terminated microgels were more swollen and not significantly responsive to temperature, in a quasi-reversible process with consecutive PE assembly. For the strong PE pair, poly(diallyldimethylammonium chloride)/poly(sodium styrene sulfonate), the differences among polycation and polyanion-terminated microgels are not sustained after the first PE bilayer due to extensive ionic cross-linking between the polyelectrolytes. The tendencies across the explored systems became less noteworthy in solutions with larger ionic strength due to overall charge shielding of the polyelectrolytes and microgel. ATR FT-IR studies correlated the swelling and responsive behavior after LbL assembly on the microgels with the extent of H-bonding and alternating charge distribution within the gel. Thus, the proposed LbL strategy may be a simple and flexible way to engineer smart microgels in terms of size, surface chemistry, overall charge and permeability.

Correia VG, Coelho M, Barroso T, Raje VP, Bonifácio VDB, Casimiro T, Pinho MG, Aguiar-Ricardo A. "Anti-biofouling 3D porous systems: the blend effect of oxazoline-based oligomers on chitosan scaffolds." Biofouling. 2013;29(3):273-282. AbstractWebsite
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Correia VG, Bonifácio VD, Raje VP, Casimiro T, Moutinho G, da Silva CL, Pinho MG, Aguiar-Ricardo A. "Oxazoline-Based Antimicrobial Oligomers: Synthesis by CROP Using Supercritical CO 2." Macromolecular Bioscience. 2011;11(8):1128-1137. AbstractWebsite
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Casimiro T, Shariati A, Peters CJ, De Ponte MN, Aguiar-Ricardo A. "Phase behavior studies of a perfluoropolyether in high-pressure carbon dioxide." Fluid Phase Equilibria. 2004;224(2):257-261. AbstractWebsite
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Casimiro T, Montilla F, Garcia S, Avilés T, Raeissi S, Shariati A, Peters CJ, Nunes Da Ponte M, Aguiar-Ricardo A. "Phase behaviour of the catalyst dicarbonyl(η5- cyclopentadienyl)-cobalt in carbon dioxide." Journal of Supercritical Fluids. 2004;31(1):1-8. AbstractWebsite
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Casimiro T, Banet-Osuna AM, Ramos AM, da Ponte MN, Aguiar-Ricardo A. "Synthesis of highly cross-linked poly(diethylene glycol dimethacrylate) microparticles in supercritical carbon dioxide." European Polymer Journal. 2005;41(9):1947-1953. AbstractWebsite
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Casimiro T, Shariati A, Peters CJ, da Ponte MN, Aguiar-Ricardo A. "Phase behavior studies of a perfluoropolyether in high-pressure carbon dioxide." Fluid Phase Equilibria. 2005;228-229:367-371. AbstractWebsite
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