Skip to main content

Table 1 Synthesis, physicochemical parameters, and silanol content of wet chemistry made silica, FSP-made silicas, and commercial fumed silica

From: Safer-by-design flame-sprayed silicon dioxide nanoparticles: the role of silanol content on ROS generation, surface activity and cytotoxicity

Silica type

HDMSO Molarity (M)

x/y

Enthalpy (MJ/kg)

SSA (m2/g)

dBET (nm)

Density (g/cc)

Silanol content (mmol OH/g)

SiOx (x)

Si-OH/SiO Ratio

 

WetChem SiO2

N/A

N/A

N/A

500a

4.9

2.4 ± 0.0

5.9 ± 0.0a

2.11 ± 0.01

0.65 ± 0.09

Cold Silica

FSP SiO2–5/5

0.5

5/5

10.9

152

15.4

2.6 ± 0.1

6.1 ± 0.1

2.01 ± 0.01

0.45 ± 0.06

FSP SiO2−3/5

0.8

3/5

8.9

186a

14.7a

2.2 ± 0.0

5.2 ± 0.1a

2.17 ± 0.01

0.43 ± 0.06

FSP SiO2−4/5

0.8

4/5

10.1

217a

12.6a

2.2 ± 0.0

4.8 ± 0.1a

2.17 ± 0.04

0.35 ± 0.05

Hot Silica

FSP SiO2−9/3

0.8

9/3

16.6

217a

12.6a

2.2 ± 0.0

2.0 ± 0.1a

2.06 ± 0.05

0.13 ± 0.02

FSP SiO2−11/3

0.8

11/3

17.8

186a

14.7a

2.2 ± 0.0

1.6 ± 0.1a

2.11 ± 0.05

0.11 ± 0.01

 

Comm. fumed SiO2

N/A

N/A

N/A

206a

9.0a

3.2 ± 0.1

0.7 ± 0.0a

2.02 ± 0.04

0.07 ± 0.01

  1. aThe values are from reference [18]
  2. SSA Specific surface area, dBET Diameter determined by Brunauer-Emmett-Teller nitrogen adsorption, FSP Flame spray pyrolysis; The nomenclature used in this table for Silica NPs indicates the method of synthesis (FSP), the molarity, and the precursor/dispersion flows ratio x/y