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Reference materials and representative test materials to develop nanoparticle characterization methods: the NanoChOp

Gert Roebben1, Vikram Kestens1, Zoltan Varga2

  • 1Institute for Reference Materials and Measurements, Joint Research Centre, European Commission Geel, Belgium.

Frontiers in Chemistry
|November 6, 2015
PubMed
Summary
This summary is machine-generated.

This study details the characterization of silica nanoparticles and quantum dots (QDs) for the NanoChOp project. Rigorous testing determined their suitability as representative test materials (RTMs) or reference materials based on intended use.

Keywords:
analytical quality assurancematerials characterizationmetrologynanoparticlereference material

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Area of Science:

  • Nanomaterial characterization
  • Metrology
  • Materials science

Background:

  • Standardized nanomaterials are crucial for reliable research.
  • Distinguishing between representative test materials (RTMs) and reference materials is essential for accurate scientific communication.
  • The NanoChOp project aimed to characterize nanomaterials for biological system studies.

Purpose of the Study:

  • To produce and characterize nanoparticle test materials for the NanoChOp project.
  • To establish criteria for classifying these materials as RTMs or reference materials.
  • To assess the suitability of silica nanoparticles and CdSe/CdS/ZnS quantum dots (QDs) for inter-laboratory comparisons.

Main Methods:

  • Small-angle X-ray scattering (SAXS), dynamic light scattering (DLS), and centrifugal liquid sedimentation (CLS) for particle size distribution analysis.
  • Microscopy (optical and electron) and plating for detecting impurities, aggregates, and microorganisms.
  • Attenuated total reflection Fourier transform infrared spectrometry (ATR-FTIR) and functionalization assays for surface characterization.
  • Zeta potential and particle size measurements for homogeneity and stability assessment.

Main Results:

  • The NanoChOp test materials, including silica nanoparticles and QDs, underwent comprehensive characterization.
  • Particle size distribution, purity, aggregation, and surface functionalization were evaluated.
  • Homogeneity and stability of the nanoparticle suspensions were confirmed through various analytical techniques.

Conclusions:

  • The classification of test materials as RTMs or reference materials depends on detailed characterization and intended application.
  • This work provides a framework for assessing the quality and suitability of nanomaterial test materials.
  • The characterized NanoChOp materials are suitable for collaborative research in chemical and optical characterization of nanomaterials in biological systems.