23 documents found, page 1 of 3
Critical review on microplastics characterisation in aquatic environments: rece...
Fernandes, Rita Correia; Martins, Roberto; Marques, CarlosAnthropogenic activities have introduced various contaminants into the freshwater and marine compartments. Microplastics (MPs) are persistent and ubiquitous contaminants threatening natural ecosystems and impairing organisms at different biological levels of organization. Their durability and degradation rate pose a great concern in the scientific community, and thus, several techniques have been used to detect...
Multipurpose fluorescent nanocarriers: environmental behavior, toxicity and int...
Campos, Bruno G.; Kaczerewska, Olga; Oliveira, Jacinta M. M.; Figueiredo, Joana; Maia, Frederico; Tedim, João; Sousa, Isabel; Abessa, DenisEngineered nanomaterials, such as silica mesoporous nanocapsules (SiNC), have emerged as a powerful tool for the controlled delivery and release of active compounds in various fields. However, the environmental impact of SiNC on marine biota, particularly when they enter the marine environment through wastewater effluents or direct release from maritime coatings, re-mains poorly understood. Studying their effec...
In-situ grown gluconate-containing CaAl-LDH/organic coating for steel corrosion...
Iqbal, Muhammad Ahsan; Neves, Cristina; Starykevich, Maksim; Martins, Roberto; Ferreira, Mário G.S.; Tedim, JoãoThis study reports the development of anticorrosive bilayer coatings consisting of in situ-grown layered double hydroxides (LDH) covered with a polyurethane layer on a steel substrate. This design aims at providing corrosion protection via the controlled release of gluconate from LDH near the substrate, while at the same time contributing to the improvement of the polyurethane layer coating adhesion. The CaAl-L...
Characterization and behaviour of silica engineered nanocontainers in low and h...
Ferreira, Violeta; Figueiredo, Joana; Martins, Roberto; Sushkova, Alesia; Maia, Frederico; Calado, Ricardo; Tedim, João; Loureiro, SusanaMesoporous silica engineered nanomaterials are of interest to the industry due to their drug-carrier ability. Advances in coating technology include using mesoporous silica nanocontainers (SiNC) loaded with organic molecules as additives in protective coatings. The SiNC loaded with the biocide 4,5-dichloro-2-octyl-4-isothiazolin-3-one (DCOIT), i.e., SiNC-DCOIT, is proposed as an additive for antifouling marine ...
Marine hazard assessment of soluble and nanostructured forms of the booster bio...
Perina, Fernando; Ottoni, Cristiane; Santos, Juliana; Santos, Vithória; Silva, Mariana; Campos, Bruno; Fontes, Mayana; Santana, Debora; Maia, FredericoThe encapsulation of antifouling compounds, such as DCOIT (4,5-Dichloro-2-octylisothiazol- 3(2H)-one), in mesoporous silica nanocapsules (SiNC) has recently been demonstrated to be an eco-friendly alternative to decrease biocide toxicity towards marine non-target species. However, the lack of information on the chronic effects of such nanomaterials on non-target tropical species is critical for a more comprehen...
Can the toxicity of polyethylene microplastics and engineered nanoclays on flat...
Santana, Lígia M.B.M. [UNESP]; Rodrigues, Andreia C.M.; Campos, Diana; Kaczerewska, Olga; Figueiredo, Joana; Silva, Sara; Sousa, Isabel; Maia, FredericoMade available in DSpace on 2022-04-29T08:33:02Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-01-15; European Commission; Fundação para a Ciência e a Tecnologia; Ministério da Ciência, Tecnologia e Ensino Superior; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); European Regional Development Fund; Centro de Inves...
Toxicity of innovative antifouling additives on an early life stage of the oyst...
de Campos, Bruno Galvão [UNESP]; do Prado e Silva, Mariana Bruni Marques [UNESP]; Avelelas, Francisco; Maia, Frederico; Loureiro, SusanaMade available in DSpace on 2022-04-29T08:38:12Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-01-01; Recent advances in nanotechnology have allowed the encapsulation of hazardous antifouling (AF) biocides in silica mesoporous nanocapsules (SiNC) reducing their short-term toxicity. However, the chronic effects of such novel nanoadditives remain understudied. The present study aimed to assess short- and ...
Mapping the macrofauna communities of Portugal's continental shelf north of Naz...
Mamede, Renato; Sampaio, Leandro; Ricardo, Fernando; Magalhães, Luísa; Lopes, Marta; Martins, Roberto; Rodrigues, Ana Maria; Freitas, RosaThe conservation and sustainable use of marine ecosystems is a worldwide concern, and to achieve it, managers and decision-makers require detailed environmental and biological information, namely supplied as maps of the seafloor. This work was conducted on Portugal’s continental shelf located north of Nazar´e Canyon. Sediment data was obtained in 226 grab samples, of which 169 were used to study the macroinvert...
“Smart” nanosensors for early detection of corrosion: environmental behavior an...
Martins, Roberto; Figueiredo, Joana; Sushkova, Alesia; Wilhelm, Manon; Tedim, João; Loureiro, SusanaCorrosion is an environmental and economic global problem. “Smart” or stimuli-responsive colorimetric nanosensors for maritime coatings have been proposed as an asset to overcome the limitations of the current monitoring techniques by changing color in the presence of triggers associated with the early stages of corrosion. Layered double hydroxides (Zn–Al LDH; Mg–Al LDH) and silica mesoporous nanocapsules (SiNC...
Can the toxicity of polyethylene microplastics and engineered nanoclays on flat...
Santana, Lígia M. B. M.; Rodrigues, Andreia C. M.; Campos, Diana; Kaczerewska, Olga; Figueiredo, Joana; Silva, Sara; Sousa, Isabel; Maia, FredericoMicroplastics and nanomaterials are applied in a myriad of commercial and industrial applications. When leaked to natural environments, such small particles might threaten living organisms' health, particularly when considering their potential combination that remains poorly investigated. This study investigated the physiological and biochemical effects of polyethylene (PE; 64-125 μm in size, 0.1, 1.0, and 10.0...