Percorrer por autor "Bártolo, Paulo"
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- Biopolymer-based manufacturing system for medical applicationsPublication . Lagoa, Ricardo; Bártolo, Paulo; Mendes, Ausenda
- Development of novel alginate based hydrogel films for wound healing applicationsPublication . Pereira, Rúben; Carvalho, Anabela; Vaz, Daniela C.; Gil, M. H.; Mendes, Ausenda; Bártolo, PauloAlginate and Aloe vera are natural materials widely investigated and used in the biomedical field. In this research work, thin hydrogel films composed by alginate and Aloe vera gel in different proportions (95:5, 85:15 and 75:25, v/v) were prepared and characterized. The films were evaluated regarding the light transmission behavior, contact angle measurements, and chemical, thermal and mechanical properties. These thin hydrogel films, prepared by crosslinking reaction using 5% calcium chloride solution, were also investigated relatively to their water solubility and swelling behavior. Results showed that Aloe vera improved the transparency of the films, as well their thermal stability. The developed films present adequate mechanical properties for skin applications, while the solubility studies demonstrated the insolubility of the films after 24 h of immersion in distilled water. The water absorption and swelling behavior of these films were greatly improved by the increase in Aloe vera proportion.
- EditorialPublication . Bártolo, Paulo; Chua, C. K.In this issue, we invited five winners of the ‘Best Paper Awards’ at the 4th International Conference on Advanced Research in Virtual and Rapid Prototyping, Leiria, Portugal, 6-10 October 2009, to enhance their conference papers to the standard of an international journal. One paper each from ‘Materials’ track, ‘Biomanufacturing’ track and ‘Virtual Environment & Simulation’ track and two papers from ‘Advanced Rapid Prototyping Technologies and Nanofabrication’ track.
- EditorialPublication . Bártolo, Paulo; Chua, C. K.As time goes on, the relevance of the Virtual and Physical Prototyping journal increases. This Journal was submitted to Thomson Scientific to be accepted as an ISI Journal and the number of conferences asking for our endorsement is growing fast, such as the following: . International Conference on Additive Technologies, IC AT2010, 22 24 September 2010, Nova Gorica, Slovenia . Virtual Concept 2010, 20-22 October 2010, Bordeaux, France Both conferences will be endorsed by Virtual and Physical Prototyping, as will the 5th International Conference on Advanced Research in Virtual and Rapid Prototyping (VRAP Conference), which will be held at Leiria by the Centre for Rapid and Sustainable Product Development of the Polytechnic Institute of Leiria, from 28 September to 1 October 2011.
- EditorialPublication . Bártolo, Paulo; Chua, C.K.The year of 2012 is a fruitful year for Virtual & Physical Prototyping. The journal has maintained its usual publication record and published a total of twenty-three original research articles (including this issue). Similarly, total citations to this journal in Year 2012 have also maintained at a near-hundred level by the mid-October (Scopus). The stabilized publication record and total citations demonstrate a mature and healthy status of the journal. In this regard, we thank all authors who have made contributions to this journal.
- EditorialPublication . Bártolo, Paulo; C. K. Chua
- EditorialPublication . Bártolo, Paulo; Chua, C.K.Additive manufacturing (AM) technologies play a key role in the advancement of biomedical applications. In this issue, we share with the readers the roles of AM technologies in two applications for biomedical engineering, namely scaffolds for tissue engineering and a composite model for club foot.
- Monitoring the modifications of Aloe vera by high performance liquid chromatographyPublication . Tojeira, Ana; Pereira, Rúben; Bártolo, Paulo; Mendes, Ausenda; Vaz, Daniela; Oliveira, Nelson SimõesAloe vera is a widely known and studied plant due to its therapeutic properties. The therapeutic properties exhibited by the Aloe vera exudates have been associated to the presence of certain compounds, such as, chromones, anthrones and anthraquinones. In this study, we have identified, and monitored by reversed phase high performance liquid chromatography (HPLC), six major compounds present in the Aloe vera exudates. The chromatographic profiles were followed in the course of time and at different wavelengths. This monitoring allowed us to verify the constitution and modifications of the samples, in order to identify the main changes responsible for the chemical degradation and loss of proprieties exhibited by the exudates over time.
- Moving Forward to 3D/4D Printed Building FacadesPublication . Craveiro, Flávio; Duarte, José P.; Bártolo, Helena; Bártolo, PauloNearly Zero Energy Buildings will require high-performance building envelopes, though the building sector is currently a major contributor to the world’s energy consumption and related CO2 emissions. Innovative advanced materials, such as smart or functionally graded materials are being developed to better adapt buildings to environmental needs. This paper presents a brief overview of novel advanced materials for passive/kinetic facades. There is a great potential for 3D/4D printing building components to address actual and future built environmental challenges. 3D printing buildings are still in its infancy, several limitations and barriers need to be addressed, though architects and engineers must keep looking forward and the rise of 4D design could bring “life” to buildings.
- Optimalmould-part I: Multi-objective optimization to moulds design for injection of polymersPublication . Ramos, Carina; Carreira, P.; Bártolo, Paulo; Alves, NunoThe problem of mould design optimisation for polymer injection is a key issue for both mouldmaking and polymer injection industries. Several computational tools have proposed to address this problem. However they do not cover all aspects related to both mould design and injection moulding process, usually requiring the geometrical configuration of the initial mould solution. This paper presents a novel multi-objective optimisation tool, integrating CAD and CAE tools to optimise mould design parameters and injection moulding process parameters. No initial geometric definition of the mould is required. An industrial case study was considered to validate the proposed approach and the performance of several optimisation algorithms evaluated.