4 research outputs found
Marine Antifouling Behavior of Lubricant-Infused Nanowrinkled Polymeric Surfaces
A new
family of polymeric, lubricant-infused, nanostructured wrinkled
surfaces was designed that effectively retains inert nontoxic silicone
oil, after draining by spin-coating and vigorous shear for 2 weeks.
The wrinkled surfaces were fabricated using three different polymers
(Teflon AF, polystyrene, and polyÂ(4-vinylpyridine)) and two shrinkable
substrates (Polyshrink and shrinkwrap), and Teflon on Polyshrink was
found to be the most effective system. The volume of trapped lubricant
was quantified by adding Nile red to the silicone oil before infusion
and then extracting the oil and Nile red from the surfaces in heptane
and measuring by fluorimetry. Higher volumes of lubricant induced
lower roll-off angles for water droplets, and in turn induced better
antifouling performance. The infused surfaces displayed stability
in seawater and inhibited growth of <i>Pseudoalteromonas spp</i>. bacteria
up to 99%, with as little as 0.9 ÎŒL cm<sup>â2</sup> of
the silicone oil infused. Field tests in the waters of Sydney Harbor
over 7 weeks showed that silicone oil infusion inhibited the attachment
of algae, but the algal attachment increased as the silicone oil was
slowly depleted over time. The infused wrinkled surfaces have high
transparency and are moldable, making them suited to protect the windows
of underwater sensors and cameras
Oil Recovery from Nanoporous Media via Water Condensation
Oil?nanoporous materials interplay is ubiquitous in oil recovery from unconventional reservoirs, environmental clean-up, and membrane technology, so there is a genuine need for novel approaches that can monitor, manipulate, and also extract the oil present in nanoporous media. Here demonstrated is a water condensation?assisted method of extracting oil from nanopores. Under cooling-induced condensation at room conditions, distinctive droplet modes act as both decoupling and collecting elements to transport oil from the pore space toward the nanomaterial surface after water evaporation. Even the movement of the oil through the nanoporous network can be visualized by taking advantage of the interference response of visible light in a nanoporous thin-film platform. The method and results presented in this work open different routes to exploit oil?water?nanopore interactions and enable novel perspectives for oil recovery and environmental clean-up.Fil: Gimenez, Rocio Aldana. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Constituyentes | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Constituyentes.; ArgentinaFil: Berli, Claudio Luis Alberto. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - Santa Fe. Instituto de Desarrollo TecnolĂłgico para la Industria QuĂmica. Universidad Nacional del Litoral. Instituto de Desarrollo TecnolĂłgico para la Industria QuĂmica; ArgentinaFil: Bellino, Gabriel MartĂn. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Constituyentes | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Constituyentes.; Argentin