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Aluminum and chromium are the two most commonly used metal hard mask materials for pattern transferring, so their salts were chosen in this study.
Li et al. demonstrated that nanoparticle-coated facemasks (nanoparticles consisting of a mixture of silver nitrate and titanium dioxide) induced a 100% reduction in the viable Escherichia coli and S. aureus observed in the coated mask materials after 48 h of incubation.
The subjects breathed through the N95 mask materials continuously throughout the N95 cycles (Fig. 3).
Breathing through N95 mask materials have been shown to impede gaseous exchange and impose an additional workload on the metabolic system of pregnant healthcare workers, and this needs to be taken into consideration in guidelines for respirator use.
The decrease in FeO2 and increase in FeCO2 are likely due to a stimulation of the respiratory drive resulting in greater efforts required to breathe through the N95 mask materials and a concomitant greater extraction of O2 for aerobic metabolism.
Although harm was not demonstrated in the context of this experimental protocol, the significant changes to respiratory physiology caused by breathing through N95 mask materials raise the concern regarding prolonged use of N95-masks by pregnant healthcare workers.
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PMMA is also commonly used as a mask material for electron beam lithography (EBL).
This work studies the hole patterning of the mask material for the subsequent SAG of GaN NCs by PA-MBE.
Portions of a pre-grown GaN buffer layer are patterned with a dielectric mask material, silicon nitride.
The factors to account for can be basically summarized into surface roughness, surface cleaning, and adhesion of the mask material to the substrate.
Typically, top-down approaches involve lithography, which defines the lateral size and shape of the final structure using an electron/photon-sensitive resist as mask material.
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