Paula Ferreira

Paula Ferreira
University of Aveiro | UA · CICECO - Aveiro Institute of Material

39.88
 · 
chemistry
About
153
Research items
7,794
Reads
2,054
Citations
Introduction
Paula Ferreira is Coordinator Researcher at CICECO – University of Aveiro. Her main scientific interests are the design and characterization of functional materials as bulk and film for catalytic, gas adsorption, energy, sensing, food packaging and other functional applications, namely ferroelectric and multiferroic applications.She has published or accepted for publication around 100 papers in scientific journals. Her SCI h factor is 25 (Scopus) with 1500 citations (excluding self-citations).
Research Experience
Jan 2015 - Sep 2015
Network
Cited By
Followers
Following
Projects
Projects (2)
Project
Electroceramics Group is engaged in fundamental and applied research in the synthesis, properties and processing of functional materials for electronics, microelectronics and related applications. Electroceramics Group has been mainly focused on electrical polarization phenomena in solids, aiming to understand mechanisms that control electrical polarization at the macroscopic and nanoscale level, and applying such understanding to the development of advanced nano and microelectronic devices. For that her group has been using electrical and structural characterization tools (impedance spectroscopy, piezo- ferroelectric analysis, scanning probe microscopy, electron microscopy, Raman spectroscopy, among others) at the highest level. Materials under investigation include perovskite type ferroelectric, piezoelectric, dielectric and multiferroic oxides and piezoelectric polymers (PLLA and PVDF). Applications of these materials include microelectronic devices as memories, sensor and actuators, energy harvesters, thermoelectric devices, tunable dielectrics, but also and more recently biorelated uses, as bio-compatible piezoelectric platforms for tissue growth, biosensors, among others. While understanding materials properties is central in many of Electroceramics Group R&D activities, the synthesis of nanofunctional materials in different geometries (1D, 2D and 3D) at low temperatures for compatible materials integration and using low cost approaches is becoming increasingly important in the group’s research activities. Within this context the group has been exploiting hydrothermal synthesis, diphasic sol precursors, photo chemical solution and electrophoretic deposition (EPD) for the preparation of nanoparticulates, nanocomposites, thin and thick films of functional materials. More recently the group initiated the exploitation of low-temperature budget processes, as FLASH sintering, a new method to densify materials abruptly above a threshold condition by a combination of furnace-temperature and DC electrical field directly applied to the specimen and Cold Sintering, using water as a transient solvent to effect densification at temperatures between room temperature and 200 ºC. In addition, one of the newest R&D interests of the group is related with Additive Manufacturing of ceramic and composite materials. The aim is on one side to explore techniques as 3D Printing and Robocasting for the fabrication of ceramic materials in direct collaboration with Portuguese Ceramic companies, on the other hand to explore Robocasting of functional ceramics and composite materials for microelectronics. The current research interests of the group comprise the following topics / projects: (1) Electric Field Driven Assembly Involving Ferroics for Biodevices and Biosensors, (2) Electrophoretic Deposition and Constrained Sintering of Functional Materials, (3) Lead Free Ferroelectrics / Piezoelectrics, (4) Low Temperature, Low Cost Fabrication of Functional Materials, Structures and Systems, (5) Nanoporous and Nanostructured Ferroelectrics, (6) Additive Manufacturing of Ceramics and Composite Materials and (7) Cold Sintering and FLASH Sintering of Lead Free Perovskite Oxides.
Project
The environmental impact and high cost of recycling conventional plastics are the main motivation to search for new bioplastic materials. Herein, this project aims to develop a biodegradable bioplastic compound as a potential alternative to conventional plastics. As a petroleum substitute, it is intended to use a natural raw material – potato. Considering the great amount of potato processing industry byproducts available, their valorization through biodegradable bioplastics development is an opportunity.
Research
Research items (153)
Article
Chitosan is a biopolymer obtained by deacetylation of chitin extracted from sub-products of the food industry and it is rich in nitrogen content. Pyrolyzed chitosan– and chitosan-periodic mesoporous organosilica (PMO)– based porous materials with different pore structures and chemical features are prepared using different dry methods and ensuing py...
Article
Full-text available
Electrically conductive materials have been highlighted in the biomedical and food packaging areas. Conventional electrically conductive polymers have limited biodegradability and biocompatibility and should be replaced by suitable biomaterials. Herein, electrically conductive bionanocomposites of chitosan and reduced graphene oxide were produced b...
Article
Periodic mesoporous organosilicas (PMOs) were suggested as potential adsorbents for CO2/CH4 separation because of their large affinities towards CO2 and low interaction with CH4. Herewith, we present a comprehensive computational study on the binding properties of flue gas species with the pore walls of periodic mesoporous phenylene-silica (Ph-PMO)...
Article
Chitosan-based functional materials are emerging for food applications. The covalent bonding of molecular entities demonstrates to enhance resistance to the typical acidity of food assigning mechanical and moisture/gas barrier properties. Moreover, the grafting to chitosan of some functional molecules, like phenolic compounds or essential oils, giv...
Chapter
This chapter presents a general view of the different aspects involved in the research on nanoparticles for magnetic hyperthermia therapeutic. After a short review of the most important requirements for magnetic nanoparticles to be used as local heaters for cancer therapy, the experimental parameters influencing the nanoparticles heating efficiency...
Chapter
The world energy demands have been increasing in the last decades driven by strong economic growth and expanding populations. Alternative energy resources have been proposed to satisfy part of the energy needs. Biogas is an alternative energy source produced through the anaerobic digestion process of organic matter. Conventional and commercial proc...
Article
This research describes the synthesis and characterization of a periodic mesoporous organosilica (PMO) with low thiol density, and its efficiency to trap Hg(II) from waters under realistic environmental conditions. Despite the low density of SH groups grafted to the silanol groups of the pristine PMO, the functionalized material displays effective...
Article
Chitosan-genipin films present a bluish-green color due to the conjugated double bonds formed when monomeric or dimeric genipin residues bridge chitosan. This phenomenon limits their use when colorless materials are required. In this work, a two-step oxidation strategy was developed aiming to remove color from chitosan-genipin films while preservin...
Article
N,N-dialkylation reaction of mesoporous aniline-silica is successfully achieved with nearly total conversion of the amine-phenylene periodic mesoporous organosilica (NH2-PMO) to the N,N-dialkylated amine material. Microwave-assisted dialkylation was optimized. Two cycles are required to promote the reaction of 2-bromopropane with the NH2-PMO and ob...
Article
Pristine, amino monofunctionalized and amino and thiol bifunctionalized phenylene-bridged periodic mesoporous organosilicas (Ph-PMO) were synthetized by a simple methodology without any protection/deprotection steps. The Ph-PMO materials were characterized and their potential as new sorbents for Hg(II) was investigated for low-contamination scenari...
Article
Periodic mesoporous organosilicas (PMO), with phenylene or biphenylene organic linkers, were thermally treated in flowing nitrogen atmosphere upon different conditions aiming the enhancement of their CO2 adsorption/separation properties. As-synthesized and template-extracted phenylene- and biphenylene-PMO were pyrolysed at 800 and 1200 °C. The effe...
Article
Efficient separation of CO2/CH4 is critical in biogas upgrading, requiring highly selective adsorbents. Based on the adsorption energies of -0.30 and -0.14 eV, previously calculated by dispersion corrected density functional theory for adsorption/desorption of CO2 and CH4 on the functionalized periodic mesoporous phenylene-silica material APTMS@Ph-...
Article
Non-porous bridged silsesquioxanes (BSs) were produced by sol-gel reactions and self-directed assembly, in the presence of an acid catalyst and a large excess of water, from bridged organosilane precursors (BOPs) synthesized by click chemistry. The rational design of the compounds, comprising an amine group and alkyl chains with variable length (n)...
Article
On page 7394, E. Ruiz-Hitzky and co-workers report on the assembly of graphene nanoplatelets with clay minerals by sonomechanical treatment. The process allows for the incorporation of various supplements, thereby providing access to low-cost electrically conducting materials with a wide range of other predesigned properties.
Article
The development of a fruit salad using mild processing conditions is demand to fulfill consumers’ requirements for convenience, long-lasting and healthy foods ensuring safety but preserving the properties of a fresh product. This work intended to investigate the effect of mild-pasteurization and storage temperature on two distinct fruit salads, wit...
Article
An approach to functionalize graphene-based materials has been developed by assembling graphene nanoplatelets (GNP) with clay minerals. Under convenient sonomechanical treatment, clay–GNP mixtures may produce very stable water dispersions in particular using sepiolite fibrous clay. While in the absence of clay a rapid decantation of GNP in water is...
Article
The synthesis and characterization of pristine and amine-functionalized periodic mesoporous phenylene-silicas having different pore sizes are reported. We explore the potential of these materials for CO2/CH4 separation, by studying the adsorption of pure CO2 and pure CH4 gases. The aminated periodic mesoporous phenylene-silica with the smallest por...
Article
Chemical self-assembly of functional ferroelectric PbTiO3 using amphiphilic block copolymers is used to prepare low-cost nanopatterned porous thin films with nanostructure control down to ~ 22 nm of lateral size. The approach developed in this work is highly effective in patterning PbTiO3 and avoids costly high-resolution lithography techniques and...
Chapter
The semiconductor industry has been characterized for more than five decades by a fast rate of development in its products. A greater degree of creativity at the level of materials and, as a consequence, of functions will be possible to be implemented. This is the case, for example, of multiferroic materials that with the coexistence of at least tw...
Article
Propylsulfonic-acid functionalized mesoporous phenylene-silicas have potential use in catalysis and applications demanding protonic conduction such as fuel cells. Their synthesis by conventional co-condensation is time consuming and with poor control of the incorporation of sulfonic acid. Here we report a fast, microwave-assisted synthetic route to...
Article
Non-functionalized and functionalized periodic mesoporous phenylene-silicas (Ph-PMOs) with different kinds of amine groups were prepared and their capacity to uptake CO2 and CH4 molecules were experimentally evaluated considering biogas upgrading. It was found that aminopropyl groups grafted to the free silanols of the Ph-PMO displayed the highest...
Article
Magnetite nanoparticles were synthesized by the co-precipitation method exploring the use of gelatine and agar as additives. For comparison, magnetite nanoparticles were also prepared by standard co-precipitation, by co-precipitation with the addition of a surfactant (sodium dodecyl sulphate) and by the thermal decomposition method. The structure a...
Article
A novel approach is described using chitosan-genipin films as a sustainable method for wine preservation. Films prepared from fungi and from shrimp by-products showed similar mechanical and chemical properties. In addition, shrimp derived films showed no IgE positive reaction against shellfish allergenic compounds. The chitosan-genipin films were u...
Article
A new concept to prepare nanocomposite thin films is explored. Two chemical-based bottom-up steps are used to design functional films including (i) the block copolymer-assisted self-assembly of a porous matrix; and (ii) the impregnation of nanoparticles from a ferroic phase into the pores by supercritical CO2 deposition. Porous nanopatterned BaTiO3...
Article
Copper(II) complexes with commercial chiral bis(oxazoline)s were for the first time directly coordinated onto amine-modified mesoporous phenylene and biphenylene silicas. All final materials maintained the 2D ordered mesoporous structure. The copper metal coordinates directly to the amine groups within the walls of the materials. The materials were...
Article
Full-text available
Nowadays, CO2/CH4 separation is considered extremely important with respect to making biogas economically viable. The search for efficient materials for biogas upgrading is at the cutting edge of research in the field of energy. Periodic mesoporous organosilicas (PMO) are highly suitable for application as selective adsorbents for CO2 as they have...
Article
Full-text available
Surface Morphology of Chitosan Films with Incorporation of Grape Pomace - Volume 21 Issue S5 - Cláudia Nunes, Alichandra Castro, Andreia S. Ferreira, Paula Ferreira, Manuel A. Coimbra
Article
Full-text available
Microsc. Microanal. 21 (Suppl 5), 2015 Microscopy Society of America 2015 doi:10.1017/S1431927615013896 Porosity... Advantage or Disadvantage? Alichandra Castro1, Paula Ferreira1, Brian J. Rodriguez2 and Paula M. Vilarinho1 1. Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal 2. School of Physics & C...
Article
The new complexes [MoBr(η3-C3H5)(CO)2(L)2] (C1) and [MX2(CO)3(L)2] (M = Mo(II), X = I (C2); M = Mo(II), X = Br (C3); M = W(II), X = I (C4); M = W(II), X = Br (C5)) were synthesized by reaction of 2-amino-1,3,4-thiadiazole (L) with [MoBr(η3-C3H5)(CO)2(NCCH3)2] (1), [MoI2(CO)3(CH3CN)2](M = Mo (2); M = W (4)), or [MoBr2(CO)3(CH3CN)2](M = Mo (3); M = W...
Article
Rare-earth (Pr3+, Sm3+, Eu3+ and Gd3+) doped bismuth ferrite powders were synthesized for the first time by solution combustion method, which is a fast soft chemistry route for obtaining oxide powders. The materials were investigated by X-ray diffraction, Raman spectroscopy, as well as scanning and transmission electron microscopy. A distortion fro...
Chapter
Periodic Mesoporous Organosilicas (PMOs) were first described in 1999 and gained immediately a great interest due to their high potential of application in catalysis, adsorption, and separation fields. These materials are formed by condensation of a bissilylated organic bridge precursor in the presence of a structure-directing agent to create poros...
Article
In this paper we report a study on the optimization of the amination of periodic mesoporous phenylene-silica (PMO) using microwave heating. The optimization was carried out for two key steps in the reaction, namely, (1) nitration of the bissilylated phenylene bridge, and (2) reduction of the nitro group to a primary amine. The temperatures of both...
Article
Heavy organic pollutants such as pesticides and pharmaceuticals are found in wastewater and are difficult to remove by microporous adsorbents because of their large size. Mesoporous organosilicas as potential adsorbents for removal of heavy organic pollutants from aqueous phase are investigated. Propylsulfonic acid-functionalized mesoporous silica...
Article
Chitosan has been studied as a renewable polymer to form edible films allowing the incorporation of functional compounds. The aim of this work was to evaluate the effects in the chitosan films properties of the incorporation of grape pomace extracts: 0.15% of hot water extract (mainly polysaccharides), 0.15 and 0.3% of chloroform extract (wax), and...
Article
Full-text available
Nanoporous and dense ferroelectric PbTiO3 thin films are prepared by a modified sol-gel process. The presence of nanoporosity, with ~ 50 nm pore size formed using a block polymer as a structure-directing agent, markedly affects the microstructure, crystallization and ferroelectric film´s properties. The crystallization of the tetragonal phase is en...
Article
Full-text available
Here, we reported the catalytic efficiency of sulfonic acid functionalized periodic mesoporous organosilica (PMO) materials with crystal-like pore walls in the dehydration of fructose to HMF in water. We found that the proton loading, the localization of acid sites and the surface hydrophobicity played a crucial role in the PMO activity.
Article
Full-text available
Here, we reported the catalytic efficiency of sulfonic acid functionalized periodic mesoporous organosilica (PMO) materials with crystal-like pore walls in the dehydration of fructose to HMF in water. We found that the proton loading, the localization of acid sites and the surface hydrophobicity played a crucial role in the PMO activity.
Article
Benzene-bridged periodic mesoporous organosilicas functionalised with sulfonic acid (S-Ph-PMO) are explored as fillers to improve the protonic conductivity and the viscoelastic properties of Nafion®. Homogeneous membranes with 5, 10 and 20 wt.% submicrometric S-Ph-PMO particles (roughly corresponding to 11, 20 and 36 vol.%) were obtained by control...
Chapter
Full-text available
This review provides insights regarding synthesis strategies for simultaneous control of tetragonality, size and shape in barium titanate. Details concerning the understanding of size and shape effect on barium titanate properties will be considered in the first place. Then a revision of the most reported barium titanate particles synthesis approac...
Article
Amination of crystal-like 1,4-phenylene-bridged periodic mesoporous organosilica (Ph-PMO) was achieved with about 35% conversion of phenylene groups. Ferrocenylimine groups were subsequently anchored onto this material by condensation of acetylferrocene with amino groups. Elemental analysis indicated that about 15% of amino groups in PMO-NH2 were d...
Article
Full-text available
The surface silanol groups in crystal-like mesoporous phenylene-silica have been derivatized with trimethylsilyl, benzyldimethylsilyl and dimethylsilyl(ferrocene) groups by performing a post-synthetic grafting reaction with the corresponding chlorosilane precursors. The success of the grafting procedure was demonstrated by transmission FT-IR spectr...
Article
Full-text available
N-Alkylation reaction of amine functionalized phenylene moieties in crystal-like mesoporous silica is successfully achieved with about 87% of conversion in two reaction cycles. A potassium iodide catalyzed method commonly used for the selective N-monoalkylation of aniline is adapted and optimized to the N-monoalkylation reactions of the amine funct...
Article
The paper addresses the effect of the carbon support on the microstructure and performance of Pt–Ru-based anodes for direct methanol fuel cells (DMFC), based on the study of four electrodes with a carbon black functionalized with HNO3, a mesoporous carbon (CMK-3), a physical mixture of TiO2 and carbon black and a reference carbon thermally treated...
Article
An investigation of proton conducting periodic mesoporous benzenosilica hybrids functionalised with sulfonic or phosphonic acids obtained by a co-condensation route is presented. Protonic conductivity data obtained under different temperatures and relative humidity conditions are reported in order to assess the combined effects of composition and c...
Article
Full-text available
Mesoporous materials have typical average pore diameters in the range 20 – 500 Å, which are usually accompanied by high specific surface area (ABET) and large pore volume (Vp) with narrow pore size distributions. These features are very attractive for potential application as catalysts and adsorbents. Mesoporous materials are usually prepared by so...