Foto Attila GorenAttila Gören

PhD Student in Physics

Master in Physics and Degree in Physics and Chemistry

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Current Project

Development of new organic electrodes for Lithium-ion rechargeable batteries
Efficient energy storage devices are one of the main needs of modern society. The aim of my work is to produce electrodes (polymer nano-composites) under several conditions in order to tune the morphology, electrical and mechanical properties, evaluate their electrochemical stability and optimize characteristics for applications.

Fig. 1 Attila GorenFig. 2 Attila Goren

(a)                                                                                    (b)

(a) 3D structure for the anode with CNT and polymer; (b) Representation of the charge and discharge modes of the electrochemical cell.


 

Foto Daniel Miranda

Daniel Miranda

PhD Student in Physics

Master degree in Physics - Specialization in Education and Degree  Physics and Chemistry  – Teaching course

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Current project

Development of a theoretical and simulation model for rechargeable lithium, magnesium and sodium-ion batteries based the influence of the separator and electrodes on battery performance

Currently, the main research is the theoretical study of the processes occurring in the operation of lithium-ion batteries and the development of theoretical models simulation/prediction of the parameters of the battery performance and test experimentally.The research focuses on porous structures (separator and electrodes) which meet the requirements for mechanical stability, adapted ionic conductivity, among others.

Fig 1 Daniel Miranda  Fig.2  Daniel Miranda

                                    (a)                                                                           (b)

 

(a) The research steps: 1. Development of the theoretical model for lithium-ion battery, 2. Development of theoretical model simulation/prediction using adequate software, 3. Test the theoretical predictions of the model simulation with experimental results obtained in developed prototypes of batteries; (b) Development of the theoretical model simulation using adequate software with objective of predicting the influence of some parameters at battery performance according to the objectives of the study.


Foto Daniela Correia

Daniela Correia

PhD student in Materials Engineering

Master degree in Characterization Techniques and Chemical Analysis and degree in Chemistry

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Current Project

3D Scaffolds based on biodegradable electroactive nanofibers for tissue engineering applications

3D scaffolds based on smart biodegradable and electroactive materials have attracted attention for applications in the biomedical field and particularly in tissue engineering such as cell supports due to its ability to stimulate the growth of cells through physical stimuli such as electrical variations, magnetic and thermal, among others.
The main objective of this project is the synthesis of electroactive biodegradable nanofibers and particles based on poly (l-lactic acid) (PLLA) and poly (hydroxybutyrate) (PHB) that are able to play the role of a synthetic extracellular matrix for cells with chondrogenic capacity. Plasma treatments are being applied in order to modify the surface adhesion and wetting properties of the scaffolds by changing the surface chemical composition or topography of the material surface.

 grupo aite 2 FILEminimizer2

a) Morphology of the electrospun fiber membranes of PHB; drug release curves of electrospun fibers with CHX and PHB/PEO with CHX antibacterial activity assays against bacteria's. b) SEM image of chondrocytes cells on PLLA electrospun membranes. c) SEM image of the influence of plasma treatment parameters in the wettability of hydophobic fibers.


Foto Gabriel Mendes

Gabriel Mendes

PhDstudent in Bioengineering MIT Portugal

Bachelor Degree in Biochemistry and PgD in Micro/Nano technologies

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Current Project

Magnetotransfection – Exploring new ways to improve Clostridium pasteurianum for better butanol yield

This project aims to develop a new method to deliver DNA into bacteria using magnetic vectors. Magnetic nanoparticles exhibiting different shapes and surface properties are being produced and characterized with the purpose of assessing their potential for forming complexes with DNA and transform both gram-positive and gram-negative bacteria through the influence of an external magnetic field. Advantages of this approach relative to conventional transformation methods such as heat-shock or electroporation are being investigated to enable improvements on the conversion of n-butanol from glycerol by metabolic engineering of Clostridium pasteurianum.

Fig.1 Gabriel mendes

HR-TEM image (left) and TEM image (right) of Fe3O4 magnetic nanoparticles. Scale bars are 5 and 100 nm respectively.


Foto Jivago

Jivago Nunes

PhD in Materials Engineering

Degree in Optoelectronics and Lasers & Master in Materials Engineering

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Current Project

Polymer based sensors fabricated by printing technologies

The development of polymer based sensors and their integration in different substrates and devices is an area of increasing scientific and technological interest. It will be investigate the development of inks for screen-printing and ink-jet printing technologies in order to allow printing of piezoelectric, piezoresistive and magnetoelectric sensors on different substrates. The research will mainly focus on inks based on copolymers and nanocomposites of polyvinylidene fluoride (PVDF) with fillers such as carbon nanotubes (CNT) or magnetostrictive ferrites. The aim of this work is to produce inks with appropriate characteristics for printing and achieve printed sensors on different substrates.

Foto esquerdaFoto direita

Left: An interdigitated pattern printed on a flexible substrate by screen printing technique.Right: Example of the printing process of screen printing technique.


Foto Juliana Dias

Juliana Dias

PhD student in Chemistry

Master degree in Characterization Techniques and Chemical Analysis and degree in Chemistry

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Current Project

Electrospun ionic electroactive polymers for artificial muscle applications

Electroactive and multifunctional polymers and composites are increasingly used in many technological applications. In particular, ionic electroactive polymer hydrogels are at the base of important artificial muscles, offering large potential for scientific and technological advances.
An applied voltage induces the polymer to expand, contract or bend. It is proposed to investigate and tailor the properties of novel and high performance multifunctional ionic electroactive polymers based on polyacrylamide, gelatin and polypyrrole with tailoring response by change microstructure of interest in sensor and actuator applications, wearable electronics, biological sensors, etc.
The materials will be prepared under several conditions using innovative electrospinning based processes, including different morphologies, particulate sizes and contents. Electrical, mechanical and electromechanical properties will be determined and related to the chemical and physical characteristics of the materials. The stability of these signals under different environmental conditions will be evaluated and their characteristics will be optimized for applications in artificial muscles.

Fig.1 Juliana DiasFig.2 Juliana Dias

(a)                                                                                             (b)

(a) SEM images of PVDF/PPy nanocomposites prepared with optimized addition of Py, FeCl3 and HCl at 0 ºC at varied reaction times: a) PVDF, b) 5 min, c) 2 h, and d) 48 h; (b) Image of Electroactive Polymers with ionic liquids.


ju foto grupo

Juliana Oliveira

PhD student in Materials Engineering

Master in Physics of Advanced Materials and Degree in Physics and Chemistry – Teaching course

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Current Project

Radiation detectors based in inkjet printing technologies

The x-ray detectors are undergoing fast development, towards obtaining digital radiographies with improved spatial resolution while reducing the radiation dose. There are two main methods to fabricate radiation detectors, known as direct and indirect approaches. The direct method usually uses a photoconductor that is directly exposed to x-rays. In the indirect method, a scintillator is placed on the top of a photodetector. Both methods have severe limitations, when the fabrication of large-area imagers is, being these imagers very expensive.The aim of this project is to study and develop an indirect method radiation detector, based in polymer electronics and inkjet printing techniques. This approach allows overcoming the size limitation of existing x-ray imagers.

Cintilador 2Cintilador

Left: Block diagram of the various components of the light output read-out system: a) X-ray source and sample support, b) light frequency sensor response and c) control system diagram.Right: Image of the polymer based nanocomposites scintillator, showing their flexibility.


Foto Paulo Sousa

Paulo Sousa

PhD student in Biomedical Engineering

Master in Micro/Nano Technologies

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Current Project

Development of all polymer sensor materials and systems for in-body biomedical applications

The purpose of this work is to develop new multifunctional nanocomposites for electroactive sensors for biomedical applications, as well as the corresponding data acquisition system. The leading application will be the development of smart biomedical implants. For this purpose, micro- and nano-composites will be processed and evaluated under several conditions.

Fig1 Paulo SousaFig2 Paulo Sousa

                  (a)                                                                             (b)

(a) Photograph of an aluminum thin film (200 nm) deposited on a 140 μm thick PDMS and patterned by photolithographic and wet etching techniques; (b) Elastic strain distribution along the PDMS diaphragm and surrounding structure for a 110 mmHg pressure signal (simulated using ANSYS software).


Foto Pedro Martins

Pedro Martins

PhD student in Physics

Master degree in Micro/Nano Technologies and Degree in Applied Biology

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Current project

 

New generation of photocatalytic nanocomposites: production, characterization and environmental application

 

This work will thus focus on the production of a new generation of materials, namely TiO2 doped nanoparticles, magnetic photocatalytic nanocomposite spheres, TiO2/poly (vinylidenefluoride-co-trifluoroethylene) porous membranes and innovative photoactive peptidic fibers and microparticles. The prepared materials will be applied in organic compounds degradation, as a suspension and immobilized in membranes for their use in photoreactor, aiming large scale applications.

TOC Fi

Representation of comparision between photocatalytic degradation of supended and imobilized TiO2 nanoparticles 


Rania Mejri

 

Current Project

Effect of ionic liquid anion and cation on the physical properties of poly(vinylidene fluoride)/ionic liquid blends

This project intend to develop electroactive actuators based in Ionic liquid (IL)/ Poly(vinylidene fluoride) (PVDF) composites. Ionic liquids are a new class of salts with a melting point below 100 ºC with unic and tunable properties while poly(vinylidene fluoride) (PVDF) is the polymer with the highest piezoelectric response among polymers. The incorporation of IL in PVDF matrix results in large displacement in bending motion, under low-voltage conditions, caused by ion migration and accumulation on the electrode under an applied electric field. Different types and percentages of ionic liquids are being used on the preparation of the materials.

rania

PVDF-Ionic Liquid actuator bending response to voltages up to +/- 5 V (below) and proposed mechanism (above).


Foto renato

Renato Gonçalves

PhD student in Materials Engineering

Graduated in Chemistry with Master on Characterization Techniques of Chemistry Analysis

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Current Project

High performance low dimensionality magnetoelectric nanocomposites for advanced applications

Electroactive multifunctional polymers and composites are increasingly used in many technological applications. In particular, the interplay of magnetic and electric properties in magnetoelectric materials offers large potential for scientific and technological advances. It is proposed to investigate novel and high performance multifunctional polymer based magnetoelectric particulate nanocomposites, including quasi-1D micro/nanofiber and sphere structures of interest for sensor and actuator applications, energy harvesting, wearable electronics, biological sensors, among others applications. Poly(vinylidene fluoride) (PVDF) is a semi-crystalline polymer with the best piezoelectric properties, and we will be mainly devoted to it and to its copolymers. The magnetostrictive phase will be composed by Fe, Ni and Co-ferrites. The composites will be prepared using innovative electrospinning based processes and an electrospray method to produce in a fast manner micro and nano spheres, including different morphologies, particulate sizes and filler contents. We will determine the electrical and magnetic properties together with the magneto-electric effect.

Fig.1 Renato  Fig.2 Renato

         (a)                                                                     (b)

(a) Fibers of PVDF filled with Co-ferrites; (b) Particle of PVDF filled with Co-ferrites.


foto Ricardo Sousa

Ricardo Sousa

PhD student in Physics

Degree in Physics and Master in Physics of Advanced Materials

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Current Project

Polymer based batteries fabricated by printing technologies

The development of micro batteries and their integration in different substrates and devices results in more efficient energy storage devices with high power and energy density. It is proposed to investigate electrodes and separator inks for printing Li-ion batteries by printing technologies in different substrates. This represents a recent area of investigation with large scientific and application potential. The research will mainly focus on inks based on co-polymers and nanocomposites of polyvinilidene fluoride (PVDF), carbon nanotubes (CNT), graphite, carbon black (CB) for anode material and cathode material based on lithium (LiFePO4) and ceramic fillers for separator. The aim of this work is to produce inks with appropriate characteristics for printing and achieve printed batteries in different substrates. Physico-chemical characterization of inks and batteries as well as battery performance will be achieved.

Fig.1 Ricardo Sousa  Fig.2 Ricardo Sousa

(a)                                                                      (b)

a) Schematic illustration of a battery; b) SEM image of polymer separator; Devices applications and advantages using printable batteries.


Foto Sílvia Reis

Sílvia Reis

PhD in Electronic and Computers Engineering

Integrated Master in Electrical Engineering and Computers

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Current Project

Development and characterization of sensor and actuator applications based on polymer based Magnetoelectric Nanocomposites

A large number of sensors are used daily in the measurement of physical quantities in several scientific, industrial or domestic applications. These devices allow monitoring and optimize, in general, everything that surrounds everyday life, contributing to improve the level of welfare of society. The main objective of this project is to develop several sensors, among which a magnetic field sensor, current sensor, liquid level and liquid flow sensors using magnetoeletric materials. The principal characteristic of those materials it's the variation of its electrical polarization in the presence of an applied magnetic field or as the variation of its induced magnetization in the presence of an applied electrical field.

Fig1 Silvia Reis  Fig2 Silvia Reis

(a)                                                                                     (b)

(a) ME composite and magnetization and polarization orientation of each layer; (b) Linearity and resolution of the AC magnetic field sensor.


 

Photo Sergio

 Sérgio Gonçalves

Grant Holder Researcher

Master degree in Industrial Electronics and Computer Engineering

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Current project

SIMPE – Multi-touch Interactive Surfaces based in Electroactive Polymers
Piezoelectric effect has been discovered back in the 18th century but recent researches in improving materials' properties has led many researchers to believe this to be the future 4thgeneration of multi-touching surfaces, and that it will soon replace most of the actual capacitive and resistive sensing technologies. Nevertheless, the low cost polymers, such as PVDF, their flexible property and transparency, make it ideal to be applied globally in a wide range of devices, such as smartphones and tablets, or intelligent products, as hybrid books, or even artificial skin. In fact, uses of piezoelectric material foils include also pressure sensing, hovering sensing, temperature sensing, sound sensing and actuation and energy harvesting, among others.


sylvie ribeiroSylvie Ribeiro

Grant Holder Researcher

Integrated Master in Biological Engineering

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Current project

Tailoring conductive materials for muscle tissue engineering applications
Topography and electric signals are important stimulus that can control cell adhesion and differentiation, conductive polymers being therefore interest materials for tissue engineering applications. Conductive polymers have proven to be relevant for the differentiation of C2C12 myoblast into multinucleated myotubes and, when stimulated by electrical pulse, can accelerate assembly of functional sarcomeres. The main objective of the present work is to develop functionalized membranes with selected architectures to induce myoblast cell proliferation and differentiation into muscle tissue. The novel electromechanical bioreactors systems are used for dynamic vibration (controlled frequency and signal amplitude).

imagem 1

A) Cell morphology and proliferation of C2C12 cells seeded on different membranes: a) glass control; b) non-poled β-PVDF; c) "poled +" β-PVDF; d) "poled -" β-PVDF; e) oriented β-PVDF fiber and f) randomly oriented β-PVDF fiber. B) Differentiation state of myotubes on "poled +" β-PVDF.

 

Development, characterization and application of novel polymer-based to x-ray detectors.

The development of radiation detectors based on polymer electronics allows increasing number of innovative potential applications including functional textile fibers, control and security check technologies, sensors and materials for energy generation and storage, among others. Another interesting and promising application opportunity lies in the biomedical materials with the development of low cost, large area and optimized performance smart materials which allows the development of detectors for imaging (such as computed tomography or/and radiation therapy in cancer treatment).
Thus, it is important to develop polymer-based materials, able to convert X-ray radiation into visible light, with good mechanical properties, thermal stability and high energy resolution.


Foto Vania Pinto

Vânia Pinto

PhD student in Biomedical Engineering

Master in Micro/Nano Technologies

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Current Project
Development and implementation of a portable lab-on-a-chip for salivary biomarkers detection. The main objective of this work is the development of a lab-on-a-chip for measurement of several biomarkers in saliva, without the use of expensive equipments, spectrophotometers or auto-analizers.