AA5182 (Al-4.5 wt% Mg) can become susceptible to intergranular corrosion (IGC) with
time at moderately elevated service temperatures owing to precipitation of Mg-rich β-phase at grain
boundaries, which can lead to stress corrosion cracking (SCC). The IGC and SCC susceptibility of
AA5182 was found to depend strongly on sensitisation heat treatments. AFM and TEM studies
demonstrated that the degree of precipitation and thus susceptibility to attack for a boundary can be
related to its crystallographic misorientation. Low angle boundaries (<20°) are most resistant to
attack as they do not show β-phase precipitation. However, higher angle boundaries show highly
variable precipitation and corrosion susceptibility: critical factors are the grain boundary plane and
precipitate/matrix crystallographic relationship.
To take full advantage of the reagent- and label-free sensing capabilities
of electrochemical sensors, a frequent and remaining challenge is
interference and degradation of the sensors due to uncontrolled pH
or salinity in the sample solution or foulants from the sample solution.
Here, we present an oil-membrane sensor protection technique that
allows for the permeation of hydrophobic (lipophilic) analytes into
a sealed sensor compartment containing ideal salinity and pH conditions
while simultaneously blocking common hydrophilic interferents (proteins,
acids, bases, etc.) In this paper, we validate the oil-membrane sensor
protection technique by demonstrating continuous cortisol detection
via electrochemical aptamer-based (EAB) sensors. The encapsulated
EAB cortisol sensor exhibits a 5 min concentration-on rise time and
maintains a measurement signal of at least 7 h even in the extreme
condition of an acidic solution of pH 3.
In recent years, laser ablation in liquid has become an increasingly important technique for the fabrication of nanoparticles (NPs). To date, only pulsed lasers have been used. This paper reports our recent studies on the generation of Ti-oxide and Ni-oxide NPs by the ablation of metal targets in aqueous environments using a high-power, high-brightness continuous-wave (cw) fibre laser at a wavelength of 1070 nm. Owing to the high and uniform irradiation, the fibre laser provides an alternative approach for NP generation with well-controlled phase, size and size distribution, along with high production rate. Characterization of the NPs, in terms of morphology, size and size distribution, chemical composition and phase structure, by means of high-resolution transmission electron microscopy (HRTEM), high-angle annular dark field (HAADF) in scanning-transmission (STEM) mode, energy-dispersive x-ray spectroscopy (EDS) and x-ray diffraction (XRD), has been presented. In addition, limitations of the cw fibre laser process have been discussed in comparison with pulsed laser process.
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