Cloth of gold

Cloth of gold

Neutral Mirrors and Beam Splitters

Published in H. Angus Macleod, Thin-Film Optical Filters, 2017

Most metal films are rather softer than hard dielectric films and can be easily scratched. Unprotected evaporated aluminum layers, for example, can be badly damaged if wiped with a cloth, while gold and silver films are even softer. This is a serious disadvantage, especially when periodic cleaning of the mirrors is necessary. One solution, as we have seen, is periodic recoating. An alternative, which improves the ruggedness of the coatings and protects them from atmospheric corrosion, is overcoating with an additional dielectric layer. The behavior of a single dielectric layer on a metal is a useful illustration of the calculation techniques in Chapter 2. We shall also require some related results later, and so it is useful to spend a little time on the problem.

Effect of gas pressure and clamping pressure on interfacial contact resistance of a cylindrical polymer electrolyte membrane fuel cell

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Journal Information

Published in International Journal of Sustainable Engineering, 2021

Amit C. Bhosale, S. R. Suseendiran, Kiran Rokhade, Raghunathan Rengaswamy

Figure 3(a) shows the dependence of ICR with the contact pressure between carbon cloth and gold coated brass sample. The resistance was observed to decrease exponentially with increase in contact pressure which is in good agreement with the reported literature (Mine et al. 2017; Misra and Nagaraju 2010; S. E Oualid et al. 2017). The decrease was attributed to higher contact region due to the increased pressure underlining more pathways for electrons to flow across the interface. The results were modelled using an empirical relation (Eq. (10)) that was used in further analysis.

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Neutral Mirrors and Beam Splitters

Effect of gas pressure and clamping pressure on interfacial contact resistance of a cylindrical polymer electrolyte membrane fuel cell