Lima, N., A. C. Baptista, B. M. M. Faustino, S. Taborda, A. Marques, and I. Ferreira,
"Carbon threads sweat-based supercapacitors for electronic textiles",
Scientific reports, vol. 10, pp. 1-9, 2020.
Faria, J., B. Dionísio, I. Soares, A. C. Baptista, A. Marques, L. Gonçalves, A. Bettencourt, C. Baleizão, and I. Ferreira,
"Cellulose acetate fibres loaded with daptomycin for metal implant coatings",
Carbohydrate Polymers, vol. 276, pp. 118733, 2022.
Baptista, A. C., I. Ropio, B. Romba, J. P. Nobre, C. Henriques, J. C. Silva, J. I. Martins, J. P. Borges, and I. Ferreira,
"Cellulose-based electrospun fibers functionalized with polypyrrole and polyaniline for fully organic batteries",
J Mater Chem A, vol. 6, issue 1, pp. 256-265, 2018.
AbstractA novel cellulose-based bio-battery made of electrospun fibers activated by biological fluids has been developed. This work reports a new concept for a fully organic bio-battery that takes advantage of the high surface to volume ratio achieved by an electrospun matrix composed of sub-micrometric fibers that acts simultaneously as the separator and the support of the electrodes. Polymer composites of polypyrrole (PPy) and polyaniline (PANI) with cellulose acetate (CA) electrospun matrix were produced by in situ chemical oxidation of pyrrole and aniline on the CA fibers. The structure (CA/PPy|CA|CA/PANI) generated a power density of 1.7 mW g−1 in the presence of simulated biological fluids, which is a new and significant contribution to the domain of medical batteries and fully organic devices for biomedical applications.
Soares, P. I. P., A. I. Sousa, J. C. Silva, I. M. M. Ferreira, C. M. M. Novo, and J. P. Borges,
"Chitosan-based nanoparticles as drug delivery systems for doxorubicin: Optimization and modelling",
Carbohydr Polym, vol. 147, pp. 304-312, 2016.
AbstractIn the present work, two drug delivery systems were produced by encapsulating doxorubicin into chitosan and O-HTCC (ammonium-quaternary derivative of chitosan) nanoparticles. The results show that doxorubicin release is independent of the molecular weight and is higher at acidic pH (4.5) than at physiological pH. NPs with an average hydrodynamic diameter bellow 200 nm are able to encapsulate up to 70% and 50% of doxorubicin in the case of chitosan and O-HTCC nanoparticles, respectively. O-HTCC nanoparticles led to a higher amount of doxorubicin released than chitosan nanoparticles, for the same experimental conditions, although the release mechanism was not altered. A burst effect occurs within the first hours of release, reaching a plateau after 24 h. Fitting mathematical models to the experimental data led to a concordant release mechanism between most samples, indicating an anomalous or mixed release, which is in agreement with the swelling behavior of chitosan described in the literature.
Contreras, J., R. Martins, P. Wojcik, S. Filonovich, H. Águas, L. Gomes, E. Fortunato, and I. Ferreira,
"Color sensing ability of an amorphous silicon position sensitive detector array system",
Sensor Actuat. A-Phys., vol. 205, pp. 26-37, 2014.
AbstractThe color sensing ability of a data acquisition prototype system integrating a 32 linear array of 1D amorphous silicon position sensitive detectors (PSD) was analyzed. Besides being used to reproduce a 3D profile of highly reflective surfaces, here we show that it can also differentiate primary red, green, blue (RGB) and derived colors. This was realized by using an incident beam with a RGB color combination and adequate integration times taking into account that a color surface mostly reflects its corresponding color. A mean colorimetric error of 25.7 was obtained. Overall, we show that color detection is possible via the use of this sensor array system, composed by a simpler amorphous silicon pin junction.
Faustino, B. M. M., D. Gomes, J. Faria, T. Juntunen, G. Gaspar, C. Bianchi, A. Almeida, A. C. Marques, I. Tittonen, and I. Ferreira,
"CuI p-type thin films for highly transparent thermoelectric pn modules",
Sci Rep, vol. 8, issue 1, pp. 6867-6867, 2018.
AbstractDevelopments in thermoelectric (TE) transparent p-type materials are scarce and do not follow the trend of the corresponding n-type materials – a limitation of the current transparent thermoelectric devices. P-type thermoelectric thin films of CuI have been developed by three different methods in order to maximise optical transparency (>70% in the visible range), electrical (σ = 1.1 × 104 Sm−1) and thermoelectric properties (ZT = 0.22 at 300 K). These have been applied in the first planar fully transparent p-n type TE modules where gallium-doped zinc oxide (GZO) thin films were used as the n-type element and indium thin oxide (ITO) thin films as electrodes. A thorough study of power output in single elements and p-n modules electrically connected in series and thermally connected in parallel is inclosed. This configuration allows for a whole range of highly transparent thermoelectric applications.