25 documents found, page 1 of 3
All-Aqueous freeform fabrication of perfusable self-standing soft compartments
Gonçalves, Raquel C.; Vilabril, Sara; Neves, Catarina M. S. S.; Freire, Mara G.; Coutinho, João A. P.; Oliveira, Mariana B.; Mano, João F.Compartmentalized structures obtained in all-aqueous settings have shown promising properties as cell encapsulation devices, as well as reactors for trans-membrane chemical reactions. While most approaches focus on the preparation of spherical devices, advances on the production of complex architectures have been enabled by the interfacial stability conferred by emulsion systems, namely mild aqueous two-phase s...
First stage of the development of an eco-friendly detergent formulation for eff...
Fernandes, Andreia P. M.; Ferreira, Ana M.; Sebastião, Marco; Santos, Ricardo; Neves, Catarina M. S. S.; Coutinho, João A. P.Detergent formulations for cleaning a carbonized soil-degreasers-typically comprise surfactants, organic solvents, phosphate-based cleaning agents, and alkaline agents, which results in high pH values (>11) that raise human and environmental risks. It is important to develop eco-friendly and safer degreasers, while maintaining their cleaning efficiency. In this work, simple degreaser formulations, with a pH bel...
Aqueous biphasic systems formed by cholinium-based ionic liquids and mixtures o...
Dinis, Teresa B. V.; Neves, Catarina M. S. S.; Barbosa, Luís; Coutinho, João A. P.; Freire, Mara G.In the past years, the relevance of introducing ionic liquids (ILs) has been shown as phase-forming components of aqueous biphasic systems (ABS), which allow the tailoring of polarity differences between the coexisting phases. Although investigations on the IL chemical structure and polymermolecularweight have been carried out, the use of mixtures of polymers can also be seen as a way of tailoring their two-pha...
Binary mixtures of ionic liquids in aqueous solution: towards an understanding ...
Neves, Catarina M. S. S.; Dinis, Teresa B. V.; Carvalho, Pedro J.; Schröder, Bernd; Santos, Luís M. N. B. F.; Freire, Mara G.; Coutinho, João A. P.The order of the salting-in or salting-out inducing ability of ions on the aqueous solubility of macromolecules in aqueous solutions is known as the Hofmeister series. Taking into account that ionic liquids (ILs) are constituted by ions, they can exert similar effects on the solubility of other ILs in aqueous media. In order to expand the knowledge on the salting-in/-out ability of ILs, experimental studies on ...
Mixtures of polymers and cholinium-based ionic liquids to tailor the phase diag...
Dinis, Teresa B. V.; Barbosa, Luís; Neves, Catarina M. S. S.; Coutinho, João A. P.; Freire, Mara G.Aqueous biphasic systems (ABS) are outstanding alternatives over conventional liquid-liquid extraction processes since it is avoided the use of volatile and hazardous organic solvents (VOCs). ABS are more biocompatible systems formed by two aqueous-rich phases that can be designed by combining different pairs of solutes (polymer-polymer, polymer-salt or salt-salt) above specific concentrations. In the past year...
Aqueous biphasic systems composed of ionic liquids and polypropylene glycol: in...
Neves, Catarina M. S. S.; Shahriari, Shahla; Lemus, Jesus; Pereira, Jorge F. B.; Freire, Mara G.; Coutinho, João A. P.Novel ternary phase diagrams of aqueous biphasic systems (ABSs) composed of polypropylene glycol with an average molecular weight of 400 g mol 1 (PPG-400) and a vast number of ionic liquids (ILs) were determined. The large array of selected ILs allowed us to evaluate their tuneable structural features, namely the effect of the anion nature, cation core and cation alkyl side chain length on the phase behaviour. ...
Aqueous biphasic systems composed of ionic liquids and polypropylene glycol: in...
Neves, Catarina M. S. S.; Shahriari, Shahla; Lemus, Jesus; Pereira, Jorge F. B.; Freire, Mara G.; Coutinho, Joao A. P.Novel ternary phase diagrams of aqueous biphasic systems (ABSs) composed of polypropylene glycol with an average molecular weight of 400 g mol(-1) (PPG-400) and a vast number of ionic liquids (ILs) were determined. The large array of selected ILs allowed us to evaluate their tuneable structural features, namely the effect of the anion nature, cation core and cation alkyl side chain length on the phase behaviour...
Densities, viscosities and derived thermophysical properties of water-saturated...
Martins, Monia A. R.; Neves, Catarina M. S. S.; Kurnia, Kiki A.; Carvalho, Pedro J.; Rocha, Marisa A. A.; Santos, Luis M. N. B. F.; Pinho, Simao P.In order to evaluate the impact of the alkyl side chain length and symmetry of the cation on the thermophysical properties of water-saturated ionic liquids (ILs), densities and viscosities as a function of temperature were measured at atmospheric pressure and in the (298.15-363.15) K temperature range, for systems containing two series of bis(trifluoromethylsulfonyl)imide-based compounds: the symmetric [C(n)C(n...
Effect of salts on the solubility of ionic liquids in water: experimental and e...
Neves, Catarina M. S. S.; Held, Christoph; Mohammad, Sultan; Schleinitz, Miko; Coutinho, Joao A. P.; Freire, Mara G.Due to scarce available experimental data, as well as due to the absence of predictive models, the influence of salts on the solubility of ionic liquids (ILs) in water is still poorly understood. To this end, this work addresses the solubility of the IL 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([C(4)C(1)im][NTf2]), at 298.15 K and 0.1 MPa, in aqueous salt solutions (from 0.1 to 1.5 mol kg(...
Effect of the Methylation and N-H Acidic Group on the Physicochemical Propertie...
Rodrigues, Ana S. M. C.; Rocha, Marisa A. A.; Almeida, Hugo F. D.; Neves, Catarina M. S. S.; Lopes-da-Silva, Jose A.; Freire, Mara G.This work presents and highlights the differentiation of the physicochemical properties of the [C(1)Him][NTf2], [C(2)Him][NTf2], [(1)C(1)(2)C(1)Him][NTf2], and [(1)C(4)(2)C(1)(3)C(1)im][NTf2] that is related with the strong bulk interaction potential, which highlights the differentiation on the physicochemical arising from the presence of the acidic group (NH) as well as the methylation in position 2, C(2), of ...