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Marine biofouling generally refers to the undesirable accumulation of biological organisms on surfaces in contact with seawater. This natural phenomenon represents a major economic concern for marine industries, e.g. for ships and vessels, oil and wind-turbine sea-platforms, pipelines, water valves and filters, as it limits the performance of devices, materials and underwater structures and increases the costs related to transport delays, hull maintenance and repair, cleaning and desalination units, corrosion and structure break-down. In the last few decades, many efforts have been spent into developing efficient antifouling (AF) surfaces (coatings) combining advances in materials science and recent knowledge of marine chemistry and biology. However, the extensive use of toxic and harmful compounds in the formulations raised increasing health and environmental concerns leading to stricter regulations which pushed marine industries to search for new AF strategies. This review presents the recent research progress made in green strategies for AF coatings using non-toxic, non-biocide-release based principles for marine applications. The two main approaches, detachment of biofoulants or preventing biofoulants attachment, are reviewed in detail and new promising routes based on amphiphilic, (super)hydrophilic, and topographic (structured) surfaces are highlighted. The chemical and physical aspects of the AF mechanisms behind the AF strategies reviewed are emphasized, with special attention to the early stages of biofoulant adhesion, keeping the focus on the materials' molecular structure and properties which allow obtaining the final desired antifouling behaviour. Portugal. During the PhD period, she was a visiting researcher at Carnegie Mellon University (Prof. K Matyjaszewski, USA) and the University of Manchester (Prof. P Hodge, UK). She is an experienced researcher on the synthesis and characterization of (nano)materials: polymers, inorganic and composites in general. Since the last 5 years, her research has focused on functional polymers and surfaces, smart materials and coatings, surface modification and reversible/ responsive polymers and surfaces. Within the smart coatings topic she investigated self-healing, superhydrophobic/superhydrophilic materials, antifouling, reversible, switching and temperatureresponsive polymers and surfaces. This research has been (co)-authored 3 book chapters peer-reviewed publications, has (co)-authored 2 book chapters and wrote articles for several social magazines and media reports.Gijsbertus de With is full professor in materials science. He graduated from Utrecht State University and received his PhD in 1977 from the University of Twente on the 'Structure and charge distribution of molecular crystals'. In the same year he joined Philips Research Laboratories, Eindhoven. In 1985 he was appointed part-time professor and in 1996 he became full professor at the Eindhoven University of Technology. Since 2006 he has also been chairman of the Soft Matter CryoTEM Research Unit. His re...
Although monodisperse amorphous silica nanoparticles have been widely investigated, their formation mechanism is still a topic of debate. Here, we demonstrate the formation of monodisperse nanoparticles from colloidally stabilized primary particles, which at a critical concentration undergo a concerted association process, concomitant with a morphological and structural collapse. The formed assemblies grow further by addition of primary particles onto their surface. The presented mechanism, consistent with previously reported observations, reconciles the different theories proposed to date.
A sponge‐like cotton fabric autonomously collects and releases water from fogs triggered by typical day‐and‐night temperature variations. The reversible switching between absorbing‐superhydrophilic/releasing‐superhydrophobic states results from structural changes of a temperature‐responsive polymer grafted on the very rough fabric‐surface. This material and concept presents a breakthrough into simple and versatile solutions for collection, uni‐directional flow, and purification of water captured from the atmosphere.
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