Synthesis and Physicochemical Characterization of Mesoporous Nanoparticles

Table 2

Physicochemical and surface properties of both pristine and surface-modified SiNPs.

Sample; name	Particle diameter* (nm)	Surface modifier	BET surface; area (m^2/g)	Pore volume; (cm^3/g)	Organic content^# (wt%)	Surface density of –COOH; (μmol/m^2)
SiNP25	27±4.3	—	1028	2.1	—	—
		C3–COOH	607	1.21	16.6	1.85
		C11–COOH	495	1.05	22.0	1.16
SiNP70	67±9	—	722	0.62	—	—
		C3–COOH	456	0.35	10.6	1.69
		C11–COOH	37^§	0.17^§	21.0	1.57
SiNP100	99±10	—	458	0.50	—	—
		C3–COOH	257	0.30	5.6	1.40
		C11–COOH	183	0.15	10.4	1.23
SiNP170	177±12	—	1011^§	0.73^§	—	—
		C3–COOH	522^§	0.48^§	11.2	1.30
		C11–COOH	185^§	0.29^§	12.2	0.61
SiNP600	596±29	—	850^§	0.51^§	—	—
		C3–COOH	342^§	0.41^§	11.5	1.59
		C11–COOH	149^§	0.25^§	9.8	0.58

∗Size determined from SEM/TEM analysis; ^#organic content was measured by TGA.
§BET surface area and pore volume are the average of results obtained from two different laboratories. The variance of the measurements was within 10%.