Nitrogen adsorption-desorption isotherms (a1-d1) and corresponding pore diameter distributions (a2-d2) of the mesoporous α-Fe2O3. The nanoarchitectures were synthesized at different temperatures for 12.0 h, with the molar ratio of FeCl3/H3BO3/NaOH = 2:3:4. Temperature (°C) = 120 (a1, a2); 150 (b1, b2); 180 (c1, c2); 210 (d1, d2). The blue line with blue circles represents the desorption curve; the red line with square rectangles represents the adsorption curve.
Zhu et al. Nanoscale Research Letters 2013 8:2 doi:10.1186/1556-276X-8-2