Figure 2.

TEM images of prepared hollow carbon nanospheres at different reaction time and content.a,b,cproducts after 5, 7, 10 h, 0.3 g sodium alginated,e,fproducts after 7, 10, 18 h, 0.1 g sodium alginate

Li et al. Nanoscale Research Letters 2009 4:1365-1370   doi:10.1007/s11671-009-9406-7