CREATE TABLE table_30057479_1 (researched_at VARCHAR2, geometry VARCHAR2)

Where was d: 25~70nm, l: 10~20 m geometry researched?
SELECT researched_at FROM table_30057479_1 WHERE geometry = "D: 25~70nm, L: 10~20 μm"
SELECT "researched_at" FROM "table_30057479_1" WHERE "D: 25~70nm, L: 10~20 μm" = "geometry"