3 documents found, page 1 of 1
Mechanical properties of alumina nanofilled polymeric composites cured with DDS...
Amaro, Ana M.; Pinto, Deesy G.; Bernardo, Luís; Lopes, Sérgio; Rodrigues, João; Louro, Cristina S.Reinforced concrete is widely used in structures. New materials to replace both the steel and the concrete have been studied in many research centres. One of the possibilities for the reinforcement is the partial or total replacement of the steel bars by new composite materials. Nano composites are very promising, and an investigation line was developed to this end by an interdisciplinary team. On this work, th...
Effect of irregular shaped nanoalumina on the enhancement of mechanical propert...
Amaro, Ana M.; Bernardo, Luís; Pinto, Deesy G.; Lopes, Sérgio; Rodrigues, João; Louro, Cristina S.This article presents experimental results on the mechanical properties of epoxy (EP) resin nanocomposites (EPNCs) reinforced with alumina nanoparticles. The nanoparticles consisted on alpha alumina with irregular shapes (100 nm maximum size) pretreated with a silane agent (3-Aminopropyl triethoxysilane, APTES). During the preparation process, silane-functionalized alumina nanoparticles, are covalently connecte...
TiO2:WO3 composite humidity sensors doped with ZnO and CuO investigated by impe...
Faia, Pedro M.; Jesus, Emanuel L.; Louro, Cristina S.For impedance-type sensors based on semiconducting metal oxides, the overall conduction mechanisms strongly influence the magnitude and the direction of the sensor signal variation. For humidity, in particular, the electronic/ionic charge-transfer reactions that take place at the semiconductor surface can be used to monitor and control it. In recent years, various mechanisms have been proposed to explain the va...