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Monolithic porous carbon materials prepared from polyurethane foam templates
João Pires,André Janeiro,Filipe J. Oliveira,Alexandre C. Bastos,Moisés L. Pinto 한국탄소학회 2016 Carbon Letters Vol.18 No.-
Monolithic carbon foams with hierarchical porosity were prepared from polyurethane templates and resol precursors. Mesoporosity was achieved through the use of soft templating with surfactant Pluronic F127, and macroporosity from the polyurethane foams was retained. Conditions to obtain high porosity materials were optimized. The best materials have high specific surface areas (380 and 582 m2 g–1, respectively) and high electrical conductivity, which make them good candidates for supports in sensors. These materials showed an almost linear dependence between the potential and the pH of aqueous solutions.
Zahid Mohammad Mir,Daniel Hoche,Celestino Gomes,Rui Sampaio,Alexandre C. Bastos,Philippe Maincon,M. G. S. Ferreira,Mikhail L. Zheludkevich 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.1
A numerical model for enhanced service life prediction of concrete infrastructure is presented which includes transient analysis of processes during corrosion initiation as well as propagation stage. The temporal and spatial transition of Steel–Concrete Interface during depassivation events is described by a randomly varying chloride threshold function. As such random activation events can be accounted for, rather than having to pre-describe the anode size and location as in many existing models. The aim of the study is to investigate random spatial activation events in concrete structures in submerged zones based on dynamically changing boundary conditions on the rebar surface to control transition from passive to active state. Investigations are carried out to realize the sustainability of corrosion processes in limiting oxygen concentrations in dissolved seawater. The model showcases the numerical architecture, the associated concept of randomly varying chloride threshold and predicts that among other factors, the rate of oxygen strongly influences corrosion rate in submerged locations.