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SEM images of the honeycomb structure of films prepared at different relative humidities (RHs): (a) 95%; (b) 90%; (c) 85%; (d) 80%. Other conditions: block copolymer 1 concentration, 0.75 mg/mL; spreading volume, 40 μL; temperature, 18 °C. The bar is 10 μm [60].
