Abstract
Silicate (7 to 12 μm) microspheres with porous shell were prepared via modified double emulsion (water 1/oil/water 2) method mediated with N 2 pressure filtration and calcination to completely remove the organic components. With the addition of sodium polymethacrylate (Na-PA) into the aqueous solution of water 1/oil/water 2 emulsion system then calcined, led to the formation of stable hierarchical macroporous (surface area: 42.94 m 2/g) from mesoporous (surface area: 259.2 m 2/g) shell wall of silicate hollow microspheres.
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