Curated Data based on Instance of Characterization
As Synthesized
Nanomaterial State:
Not Reported
Cornell University
Synthesis Method:
Stober process
DOI Reference:
  • Physico-Chemical Characteristics
  • biological interactions
  • Environmental interactions
Particle Size

Mean Primary Particle Size:
300 nm
Scanning Electron Microscopy
Aggregation/Agglomeration State

Not Aggregated/Agglomerated
Scanning Electron Microscopy

Nanoscale Dimensionality:
Scanning Electron Microscopy
CORE (hover over circle for proportion of material)
arrow Proportion of Nanomaterial:    Not reported
Component 1
Material Type:
Metal Oxide
Molecular Identity:

How well was this nanomaterial characterized? 1 people thought this nanomaterial was well characterized. 0 people thought this nanomaterial was NOT characterized well.



Fred Klaessig

This is my third time for a comment on NR41. The two earlier entries spanned 6 months, one disappearing during a registry upgrade around August 2012 and one disappearing around year end. Comments on NR44 and NR81 suffered the same fate. Relative to NR 41, there is no publicly accessible source for the entry through the NIL , and it is therefore difficult to claim synthesis traceability to a paper by Stöber. All seven curation questions have “no” as the answer. NR41, unfortunately, is simply a picture in a database. The earlier comments had suggestions to a possible a source, but the curator should check the reference, if that is considered appropriate. The need to enter a comment three times raises other issues regarding curation: (1) What is the purpose of enlisting comments ? (2) should the curator respond to the specifics of a comment ? (3) are comments archived ? (4) is there a management of change process when revisiting entries in response to comments ?.....and so on. Curation is a challenge. Yet, the Registry does ask that we evaluate a colleague’s work, a colleague whose data may be absolutely appropriate to their original purpose, but where we are making judgements of “compliance.” Traceability to the correct origin, so that we can evaluate the original purpose, would helpful. For NR41, the origin appears to be Professor Ulrich Wiesner of Cornell, but the cited paper is not his.

Leave a Comment

Your Name:*
Your Email:*
Do you think this nanomaterial was well characterized? Yes No
What is 5+5?*
This question is for testing whether you are a human visitor and to prevent automated spam submissions.
* Required
MIAN-specific data are curated from data sources and presented on the nanomaterial details page, below. When available, the original publication link is provided so that you can verify the source data and access data that is outside of the NR MIAN. The NR Descriptor is a high level classification of the nanomaterial based on primary composition and shape.
Instance of Characterization (IOC) is a classification and description of the nanomaterial’s surrounding environment and time at which it was characterized. Each IOC at which the nanomaterial was characterized or studied is listed in the left side page navigation bar. You can click on an IOC in the navigation bar to see the curated data associated with that particular IOC.
Click the FIND SIMILAR NANOMATERIALS button to query nanomaterials that are at least 10% similar to this one. Similarity is determined using the Registry’s NANOMATERIAL SIMILARITY rules.
Compliance Levels are calculated using the Registry’s minimal information about nanomaterials (MIAN). More information can be found on the How Are Compliance Levels Calculated? or Minimal Information about Nanomaterials pages.
Data for physico-chemical characteristics (PCC) and interaction studies are curated when available. Physico-chemical characteristics are curated based upon the Registry’s Minimal Information about Nanomaterials (MIAN). Data from studies are contained on the Biological and Environmental Interaction tab and are summarized using four categories: General Study Details, Test Subject(s), Exposure Summary(s), and Endpoint(s).
ver 6.1.1