add other masks and physical measurements

.gitignore

+# ignore mac files
+.DS_Store
\ No newline at end of file

Gerson_N95/gersonN95.md

+# Gerson N95 Mask 
+
+manufacterer site: []()
+
+![](./gersonN95_mask.jpg)
+
+## physical measurements
+#### thickness (mm pm 0.005) measurements: 
+- overall: 1.076
+- inside layer: 0.495
+- middle layer: 0.217
+- outside layer: 0.429
+
+#### weight (10(pm 0.5) x10(pm 0.5) mm square material) measured in g pm 0.0005
+overall: 0.0306
+inside layer: 0.0120
+middle layer: 0.0051
+outside layer: 0.0122
+
+## imaging 

KC_47117/KC47117.md

+# Kimberly Clark #47117
+
+manufacturer site: [Kimberly Clark 47117](https://www.kcprofessional.com/en-us/products/scientific/respiratory-protection/47117)
+
+- not recommended for blood or blodily fluid protection
+
+![](./KC47117.jpg)
+
+Three layer mask (inside --> outside, left --> right)
+![](./KC47117_layers.jpg)
+
+## physical measurements
+#### thickness (mm pm 0.005) measurements: 
+- overall: 0.184
+- inside layer: 0.072
+- middle layer: 0.086
+- outside layer: 0.069
+
+#### weight (10(pm 0.5) x10(pm 0.5) mm square material) measured in g pm 0.0005
+overall: 0.0067
+inside layer: 0.0023
+middle layer: 0.0021
+outside layer: 0.0026
+
+
+
+## imaging
+
+When imaging in the SEM without sputter coating the material you disappear if focus too closely (either blowing away or disintegrating from the electron beam - hopefully this isn't damaging the SEM??) the same way that the dust particles on the Gerson N95 did. So I added a 20 nm gold layer to the top of each layer. 
+
+### observations
+- the outer layers look like some sort of pressed pulp, not as fibrous and stringy as the N95 masks
+- the middle layer looks more like the N95 mask outer layer, except with smaller fiber width
+