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EC number: 231-131-3 | CAS number: 7440-22-4
Nanomaterial agglomeration / aggregation
Administrative data
- Endpoint:
- nanomaterial agglomeration/aggregation
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 017
- Report date:
- 2017
Materials and methods
- Principles of method if other than guideline:
- Granulometry (primary particle size and shape, aggregate/agglomerate size and primary particle size distribution (number-based)) was determined by Transmission Electron Microscopy (TEM).
The specimens were examined using a Tecnai Spirit microscope (FEI, Eindhoven, The Netherlands) and using ParticleSizer software. - GLP compliance:
- no
- Type of method:
- transmission electron microscopy
Test material
- Reference substance name:
- Silver
- EC Number:
- 231-131-3
- EC Name:
- Silver
- Cas Number:
- 7440-22-4
- Molecular formula:
- Ag
- IUPAC Name:
- Silver
- Test material form:
- solid: nanoform, surface-treated
- Remarks:
- paste of nanomaterial
- Details on test material:
- Spherical particles
Particle size distribution (primary particles; number-based): Min = 11 nm, D25 = 25 nm, D50 = 34 nm, D75 = 48 nm, Max = 161 nm
Volume specific surface area: 150 m2/cm3
Zeta potential: -23.3 mV
Constituent 1
Data gathering
- Instruments:
- Tecnai Spirit microscope (FEI, Eindhoven, The Netherlands)
Results and discussion
Agglomerate / aggregate diameter
- Mean diameter:
- 50 nm
- St. dev.:
- 42.3 nm
- Medium:
- 0.01 M NaOH
- Remarks on result:
- other: Min. Feret diameter
Agglomerate / aggregate sizeopen allclose all
- Percentile:
- D25
- Mean:
- 26 nm
- St. dev.:
- 0
- Medium:
- 0.01 M NaOH
- Remarks on result:
- other: Min. Feret diameter
- Percentile:
- D50
- Mean:
- 36 nm
- St. dev.:
- 0
- Medium:
- 0.01 M NaOH
- Remarks on result:
- other: Min. Feret diameter
- Percentile:
- D75
- Mean:
- 57 nm
- St. dev.:
- 0
- Medium:
- 0.01 M NaOH
- Remarks on result:
- other: Min. Feret diameter
Any other information on results incl. tables
Column |
|
Size |
Mean |
Std Dev |
Max |
Min |
Median |
25% |
75% |
Area |
(nm2) |
427 |
3759,8 |
7735,5 |
79000,0 |
1,4 |
1000,0 |
662,1 |
3000,0 |
Area Conv. Hull |
(nm2) |
427 |
4708,2 |
11784,1 |
125000,0 |
2,1 |
1000,0 |
685,8 |
4000,0 |
Peri. |
(nm) |
427 |
231,4 |
292,7 |
2746,0 |
3,0 |
140,0 |
94,0 |
243,8 |
Peri. Conv. Hull |
(nm) |
427 |
198,0 |
171,5 |
1385,0 |
3,0 |
139,0 |
94,0 |
232,8 |
Feret |
(nm) |
427 |
73,1 |
65,0 |
550,0 |
1,0 |
52,0 |
33,0 |
87,8 |
Min. Feret |
(nm) |
427 |
50,0 |
42,3 |
370,0 |
0,6 |
36,0 |
26,0 |
57,0 |
Maximum inscribed circle diameter |
(nm) |
427 |
35,4 |
18,8 |
119,0 |
1,0 |
32,0 |
24,0 |
43,0 |
Area equivalent circle diameter |
(nm) |
427 |
55,6 |
41,5 |
317,0 |
1,0 |
43,0 |
29,0 |
64,8 |
Long Side Length MBR |
(nm) |
427 |
70,2 |
61,8 |
501,0 |
1,0 |
51,0 |
31,0 |
85,8 |
Short Side Length MBR |
(nm) |
427 |
50,5 |
42,9 |
374,0 |
0,6 |
36,0 |
26,0 |
58,0 |
Aspect Ratio |
(N/A) |
427 |
1,249 |
0,238 |
2,176 |
1,000 |
1,172 |
1,063 |
1,350 |
Circ. |
(N/A) |
427 |
13,253 |
1,260 |
21,562 |
11,950 |
12,852 |
12,425 |
13,621 |
Elong. |
(N/A) |
427 |
0,430 |
0,142 |
0,752 |
0,098 |
0,430 |
0,326 |
0,530 |
Convexity |
(N/A) |
427 |
0,998 |
0,009 |
1,000 |
0,900 |
1,000 |
1,000 |
1,000 |
Solidity |
(N/A) |
427 |
0,978 |
0,017 |
0,994 |
0,837 |
0,984 |
0,977 |
0,988 |
Applicant's summary and conclusion
- Conclusions:
- TEM images show that the sample consists mainly of small single primary particles and agglomerates of larger primary particles.
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