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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Quantifying nanoparticles in clays and soils with a small-angle X-ray scattering method.

Katsuhiro Tsukimura1, Masaya Suzuki1

  • 1Research Institute of Geo-resources and Environment, Geological Survey of Japan, Advanced Industrial Science and Technology, Central 7, Higashi-1, Tsukuba, Ibaraki 305-8567, Japan.

Journal of Applied Crystallography
|February 13, 2020
PubMed
Summary

A new method quantifies nanoparticles in clays and soils using small-angle X-ray scattering (SAXS). This technique allows for accurate measurement of nanoparticle weight ratios, crucial for understanding soil and clay properties.

Keywords:
allophanecolloidal silicaferrihydritekaolinitenanoparticles in clays and soilspyrophillitequantitative analysis of nanoparticlessilica gelsmall-angle X-ray scatteringsmectite

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Area of Science:

  • Materials Science
  • Geochemistry
  • Analytical Chemistry

Background:

  • Clays and soils contain amorphous nanoparticles like allophane and ferrihydrite, influencing their properties.
  • Quantifying these nanoparticles is challenging due to the lack of standardized methods.
  • Existing methods often overlook or inaccurately measure nanoparticle content.

Purpose of the Study:

  • To develop and validate a quantitative method for determining nanoparticle weight ratios in clays and soils.
  • To establish a reliable technique using small-angle X-ray scattering (SAXS) for nanoparticle analysis.
  • To address the need for accurate quantification of amorphous nanoparticles in geological samples.

Main Methods:

  • Derivation of normalized SAXS intensities per unit weight to eliminate absorption effects.
  • Integration of normalized SAXS intensities over reciprocal space to obtain a value proportional to nanoparticle weight ratio.
  • Estimation of nanoparticle density from sample chemical composition for accurate weight ratio calculation.

Main Results:

  • The integral SAXS method successfully quantified nanoparticles in various samples, including colloidal silica, silica gels, and synthetic clays.
  • Weight ratios of nanoparticles in natural clays were determined: montmorillonite (25±7 wt%), pyrophillite (10±2 wt%), and kaolinite (19±5 wt%).
  • The developed method demonstrated a quantification error of approximately 25% for nanoparticle weight ratios.

Conclusions:

  • The integral SAXS method provides a viable approach for quantifying amorphous nanoparticles in clays and soils.
  • Accurate nanoparticle quantification is essential for understanding the properties and behavior of soil and clay materials.
  • The study highlights the significant nanoparticle content in certain natural clay deposits, emphasizing the importance of this quantification method.