26 documents found, page 1 of 3
Simulation of two-phase flow in network mixers using periodic boundary conditions
Isabel Sousa Fernandes; Madalena M. Dias; José Carlos B. Lopes; Santos, RJNETmix is a network mixer comprising mixing chambers interconnected by channels. Recently, a reduced geometry CFD model, the LoopNUB, was introduced for simulating single-phase flow with heat transfer in NETmix by imposing periodic conditions around the four unit cells of the network. This work proposes using LoopNUB, reducing the simulation domain by 2.3 compared to the geometry (ExtendedNUB) previously used t...
Metal-free carbon nitride polymeric films for the synthesis of valuable organic...
Constantino, DSM; José Carlos B. Lopes; Carneiro, RC; Lopes, JCB; Madalena M. Dias; Faria, JL; Silva, CGImmobilised photocatalytic systems can strongly contribute to attaining more sustainable chemical processes, reducing downstream units for photocatalyst recovery and purification of the target molecules. On the other hand, it is known that this kind of photocatalytic system usually presents higher mass transfer resistance when compared with slurries and, consequently, slower kinetics. Besides, this can be even ...
Flow dynamics studies in the NETmix reactor for a large range of flowrate ratio...
Cullen, LJR; Isabel Sousa Fernandes; Margarida Brito; Madalena M. Dias; Lopes, JCB; Ricardo J. Santos; Vitor VilarThe mixing dynamics that occur inside the NETmix reactor have been previously thoroughly studied for equal feed streams distributed through the inlets. To broaden the applicability of this static mixer, this work intends to expand the knowledge of the mixing dynamics mechanisms for cases where dissimilar inlet flowrates are imposed. Computational Fluid Dynamics (CFD) tools were used to simulate flow dynamics ex...
Selective electrochemical oxidation of organic compounds in a mass transfer-enh...
Rosa, CH; Morais, DFS; Rosa, GR; dos Santos, JHZ; Lopes, JCB; Madalena M. Dias; Montes, R; Rodil, R; Quintana, JB; Cerrón-Calle, GA; Garcia-Segura, Se(-)NETmix stands as an electrochemical flow reactor engineered to enhance mass transfer. This study aimed at assessing the performance of the e(-)NETmix reactor in the realm of organic electrosynthesis. Specifically, the research focused on the selective electrochemical oxidation of 4-methoxybenzyl alcohol (4-MBA) to p-anisaldehyde (PAA) using a bare fluorine-doped tin oxide (FTO) anode. The efficiency of the ...
Chaos and mixing in NETmix
Matos, J; Ricardo J. Santos; Madalena M. Dias; Lopes, JCBNETmix is a network of mixing chambers interconnected by channels, in which the most efficient mixing occurs under chaotic flow regimes. Chaos is highly influenced by the topology, particularly by the ratio chamber diameter/channel width, D/d. In this work, micromixing in NETmix is characterized through Lagrangian Mixing Simulation (LMS), which enables to establish the relation between the degree of mixing and ...
Recovery of ergosterol from Agaricus bisporus mushrooms via supercritical fluid...
Almeida C.F.; Manrique, Y.A.; Lopes J.C.B.; Martins, FG; Madalena M. DiasThis work uses the response surface methodology to optimise ergosterol recovery from Agaricus bisporus mushrooms by supercritical fluid extraction. The influence of pressure, temperature, co-solvent use, and solvent-to-mushroom mass ratio was evaluated on yield and extract composition. Considering temperature, pressure, and co-solvent volume percentage, predictive models were regressed for extraction yield, erg...
Nano-hydroxyapatite Pickering emulsions as edible mayonnaise-like food sauce te...
Relvas, ME; Ghirro, C; Isabel M. Martins; Lopes, B; Madalena M. Dias; Barreiro, MF; Andreia RibeiroPickering emulsions have the potential to enhance product stability and provide opportunities to create functional solutions that align with labelling requirements. The present work aims to develop Pickering emulsions stabilised by nano-hydroxyapatite (n-HAp) particles to replace traditional mayonnaises. The study addresses the effect of n-HAp solid particle concentration (5-15 wt%) and oil-water ratio (50:50, ...
Evaluating the potential of natural polymers for water-dispersible curcumin-bas...
de Rezende, SC; Ferreira, O; Santamaria-Echart, A; Madalena M. Dias; Barreiro, MFSolid dispersion (SD) technology, a strategy through which a hydrophobic compound is molecularly dispersed into a hydrophilic carrier, is raising interest in food applications to surpass natural colourants' low water solubility. Motivated by the importance of using natural solutions, five natural polymers (k-carrageenan (KC), maltodextrin (MD), Arabic gum (AG), potato starch (PS), and pectin (PC) were evaluated...
Bone regeneration driven by a nano-hydroxyapatite/chitosan composite bioaerogel...
Souto Lopes, M; Liliana Grenho; Manrique, Y; Madalena M. Dias; Lopes, JCB; Fernandes MH; Monteiro, FJ; Salgado, CLThe most recent progress in reconstructive therapy for the management of periodontitis and peri-implantitis bone defects has relied on the development of highly porous biodegradable bioaerogels for guided bone regeneration. The objective of this work was to evaluate in vitro the osteoinduction of periodontal-originating cells (human dental follicle mesenchymal cells, DFMSCs) promoted by a nano-hydroxyapatite/ch...
Development of O/W Pickering Emulsions Stabilized with Leek Leaf Trimmings Usin...
Marques, MP; Sanchez-Salvador, JL; Monte, MC; Blanco, A; Ricardo J. Santos; Madalena M. Dias; Manrique, Y.A.; Margarida BritoVegetable trimmings can be used to stabilize edible O/W Pickering emulsions. The lignocellulosic biomass (LCB) from the leek trimmings was mechanically treated to produce high-yield lignocellulose micro and nanofibrils (LCF) using a high-pressure homogenizer (HPH). Different O/W phase ratios (20/80, 30/70, and 40/60 wt.%) were studied. The use of the micro/nano cellulosic fibers increased the stabilization of t...