Download Data supplement 3

vi.
Collect the resin from the alundum thimbles and discard the filtrate (i.e.
solvent).
vii.
Wash the resins in thimbles by pouring 500ml of methanol followed by 1:1
methanol:DCM mixture to purify the resins.
viii.
Dry the resins by placing the thimbles in hot air oven at 50°C for up to 2-h or
until the resin in completely dry.
ix.
Weigh the thimble and if the balance does not stabilize, dry the thimbles in
the oven to expel excess solvent from the resin.
x.
Transfer the dried resins into a clean flask and store it in a dark place at
room temperature.
xi.
Place the tissue quartz filters in crucibles and bake it at 700-800°C for 4h in
a muffle furnace.
xii.
Transfer the baked filters into a clean amber glass container and close the lid
tightly to avoid any contact with ambient air.
xiii.
Weigh 1.8g purified resin into a clean 500ml beaker to coat 75 filters.
xiv.
Add 275ml n-hexane into the resin beaker and sonicate the mixture for
30min in a fume hood.
xv.
Allow the slurry to settle for 10 seconds and decant about 75% of the slurry
into a clean 250ml beaker (optimized slurry).
xvi.
Sonicate the optimized slurry for approx.5min and then divide the slurry
equally into two clean 200ml glass beakers by transferring 30mL aliquots
alternatively into each beaker until the slurry is divided equally. Cover the
two beakers containing the slurry and label them.
xvii.
Take the first slurry beaker and sonicate it for 1-2min before starting to coat
the filters.
xviii.
xix.
Arrange the baked filters on a clean aluminum foil in rows of 10.
Start coating with the first filter from the first row by dipping the filter the
ten times into the beaker containing the resin slurry.
xx.
Place the first coated filter with rough side facing up and move onto the next
filter.
xxi.
Follow the same coating steps until all 75 filters are coated.