RESUMO
Hydrophobic coatings on cotton fabrics were successfully prepared via solution deposition of a "flat" nanoscale aluminum hydroxo cluster and a photo-assisted anneal using ultraviolet light. The coatings have a low surface roughness and high uniformity confirmed by SEM imaging and elemental analysis. The method represents a robust, scalable, and environmentally benign procedure suitable for industrial processes.
Assuntos
Têxteis , Raios Ultravioleta , Interações Hidrofóbicas e Hidrofílicas , Temperatura , ÁguaRESUMO
We have prepared and characterized hydrosulfide-selective ChemFET devices based on a nitrile butadiene rubber membrane containing tetraoctylammonium nitrate as a chemical recognition element that is applied to commercially available field-effect transistors. The sensors have fast (120 s) reversible responses, selectivity over other biologically relevant thiol-containing species, detection limits of 8 mM, and a detection range from approximately 5 to 500 mM. Sensitivities are shown to be 53 mV per decade at pH 8. Use of this compact, benchtop sensor platform requires little training - only the ability to measure DC voltage, which can be accomplished with a conventional multimeter or a simple analog data acquisition device paired with a personal computer. To the best of our knowledge, this report describes the first example of direct potentiometric measurement of the hydrosulfide ion in water.
RESUMO
The use of a novel inorganic nanoscale cluster (Al[(µ-OH)2Co(NH3)4]3(NO3)6) was investigated for its utility as a precursor for AlCoOx films. Mixed-metal aluminum and cobalt oxide thin films were solution deposited from the novel cluster solution via the spin-coating method on Si (100) and quartz substrates. The films were annealed at increasing temperatures up to 800 °C, and characterization of these films via TEM and XRD confirms binary Co3O4 crystalline phase present in an amorphous Al2O3 network. Films are relatively smooth (Rrms < 4 nm), polycrystalline, and demonstrate a tunable optical response dominated by Co3O4 with two electronic transitions.