Ordered mesoporous silica prepared by quiescent interfacial growth method - effects of reaction chemistry

Table 2 Structural properties of the mesoporous silica products

Sample	d₁₀₀spacing^a(nm)	a₀^b(nm)	w_BJH^c(nm)	Wall thickness^d(nm)	S_BET(m²/g)	V_tot^f(cm³/g)
MSF	3.72	4.3	2.35	1.95	1,008	0.64
MS7
0.2 NA	4.60	5.31	3.01	2.30	624	0.43
0.5 NA	4.70	5.42	2.97	2.45	560	0.40
1 NA	3.42	3.95	2.5, 3.8ⁱ	0.92	1,454	1.26
2 NA	3.20	3.69	2.90	0.30	799	0.62
3.34 NA	4.34	5.01	2.86	1.48	887	0.54
MS12
1 SA	3.27	3.78	2.49	0.78	1,506	0.98
2 SA	3.42	3.95	2.56	0.86	1,504	0.96
3.34 SA^g
MS4	3.64 to 7.21	4.3 to 8.3	3.70	1.73 (1.91^e)	475	0.28
MS6b	4.10	4.73	2.64	1.46	299	0.16
MS5a	^h	^h	3.00	-	375	0.24
MS5b	6.15	7.10	3.70	2.45 (2.85^e)	199	0.17

^aCalculated from 2θ value corresponding to the (100) peak in the XRD pattern using Braggs law; ^b $a_{0} = d_{100} \times \sqrt{(4 / 3)}$ ; ^cBJH pore diameter calculated from the desorption isotherm; ^dFor poorly ordered materials wall thickness = d₁₀₀ − w_BJH, the better order samples (MSF, 0.1 NA and 0.2 NA) are calculated as a₀ − w_BJH; ^eEstimated from TEM images; ^fSingle-point total pore volume at p/p_o = 0.995; ^gNo growth was observed with this molar value of sulfuric acid over the growth period; ^hNot determined from XRD graph; ⁱBimodal pore size distribution.