Aerosol-assisted synthesis of mesoporous organosilica microspheres with controlled organic contents

Figures & data

Scheme 1 System diagram of laboratory-made spray dryer.

Table 1 Amounts of TEOS and BTSE in precursor solutions.

	Amount of TEOS (g)	Moles of TEOS (mol)	Amount of BTSE (g)	Moles of BTSE (mol)	BTSE/TEOS mole ratios
Sample 1	6.5	0.031	0.0	0.0000	0.00
Sample 2	5.2	0.025	1.1	0.0031	0.12
Sample 3	3.3	0.016	2.8	0.0079	0.50

Figure 1 SEM images with 5 μm scale bar of (a) Sample 1, (b) Sample 2 and (c) Sample 3, and corresponding particle size distributions. The line in the particle size distribution indicates the normal distribution function.

Figure 2 SAXS spectra of (a) Sample 1, (b) Sample 2 and (c) Sample 3.

Figure 3 TEM images of (a) Sample 1, (b) Sample 2, (c) Sample 3 and (d) PMO with benzene fragments. Scale bars in the images are 50 nm.

Figure 4 TEM images of (a) sliced Sample 1 and (b) Sample 3. Arrows indicate tubular mesopores.

Figure 5 N₂ adsorption–desorption isotherms and pore size distributions for (a) Sample 1, (b) Sample 2 and (c) Sample 3. BET surface areas and average pore diameters are noted in the figures.

Figure 6 (a) ²⁹Si MAS NMR and (b) ¹³C CP/MAS NMR spectra of Samples 1, 2 and 3. Peaks marked by filled circles and open triangles are due to the original surfactant and ethoxy groups, respectively.

Figure 7 (a) SAXS patterns and TEM images of calcined (at 900 °C for 2 h) products of (b-1) Sample 1, (b-2) Sample 2 and (b-3) Sample 3.

Figure 8 Water adsorption–desorption isotherm of Sample 3.