What fabrics make the most effective homemade masks?

I agree. Input from textile science and technology, filtration operation and mask design are all areas that should comment / add to further expansion of this study. I would like to add one other area of expertise, that of a seamstress. A person with knowledge about readily available sewing materials and how they are used would be helpful when providing information on the fabric used in the study.
After I read this article, 3 questions came to mind.
1. I noticed the study did not consider "interfacing" which many mask-makers use when making the masks. Interfacing is typically used as a stabilizer in sewing. The interfacing is ironed on to the cotton and is meant to help act as a filter. The combination of the non-woven interfacing with 2 layers of cotton fabric is quite common, in mask-making circles. Please note that there are several "weights" of interfacing, from feather weight to heavy weight, to batting. I initially used mid-weight interfacing, but switched to featherweight due to the summer heat.
2. Another question related to how long the various materials would continue to be functional. Cotton retains moisture, silk and wool tend to "whisk" it away from the skin. Understanding that as fabric becomes moist, the filtration lessens, how often would a person have to change an all cotton mask vs a cotton-silk mask?
3. Related to fabrics, microfiber materials have become common due to the stretch characteristic of that fabric. However most of microfibers are synthetic, aren't they? I am curious if a combination of cotton on the inside with the microfiber on the outside is a possibility. The biggest advantage of the microfiber is that it stretches over the contours of the face.