Registration Dossier
Registration Dossier
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EC number: 257-098-5 | CAS number: 51274-00-1 This substance is identified in the Colour Index by Colour Index Constitution Number, C.I. 77492.
Nanomaterial specific surface area
Administrative data
- Endpoint:
- nanomaterial specific surface area
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
Data source
Referenceopen allclose all
- Reference Type:
- publication
- Title:
- The Iron Oxides: Structure, Properties, Reactions, Occurrences and Uses: Structure, Properties, Reactions, Occurences and Uses
- Author:
- Schwertmann U, Cornell RM
- Year:
- 2 003
- Bibliographic source:
- Verlag: Wiley-VCH; Auflage: 2., vollst. überarb. u. erw. Aufl. (29. Juli 2003); Sprache: Englisch; ISBN-10: 3527302743; ISBN-13: 978-3527302741
- Reference Type:
- other company data
- Title:
- Unnamed
- Year:
- 2 015
Materials and methods
- Principles of method if other than guideline:
- BET measurements (Brunauer, Emmett und Teller)
XRD line broadening techniques
Test material
- Reference substance name:
- Iron hydroxide oxide yellow
- EC Number:
- 257-098-5
- EC Name:
- Iron hydroxide oxide yellow
- Cas Number:
- 51274-00-1
- Molecular formula:
- Fe(OH)O
- IUPAC Name:
- Iron hydroxide oxide
- Test material form:
- solid: nanoform
- Details on test material:
- no details given; Iron oxides name Goethit is used
Constituent 1
Results and discussion
Any other information on results incl. tables
It is reported that the surface areas of both natural and synthetic goethites range from ca. 8 to 200 m²/g. XRD line broadening techniques indicate that soil goethites have surface areas of from 20 to 200 m²/g. On the other hand, massive (museum) specimens may consist of mm sized crystals with surface areas well below 1 m²/g.
Surface areas of several goethites are presented: the surface area of goethite grown from ferrihydrite in 0.7 M KOH decreased from 153 m²/g at 4°C to 9 m²/g at 60 -90°C; the BET method gave different values (88 -15m²/g). The surface areas of the high area samples could be lowered by hydrothermal treatment at 150 - 180°C due to recrystallisation process (termed: healing). The recrystallisation process eliminated domains serrated edges while the overall crystal size remained essentially the same; it also lowered the microscope volume from 0.6 to 0.006 volume % and the mean micropore diameter from 1.4 to 0.4 nm.
Applicant's summary and conclusion
- Conclusions:
- The specific surface area of iron oxide pigments differs in dependence of the grade. The range is between 2 m²/g and about 20 m²/g.
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