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Related Concept Videos

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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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Related Experiment Video

Updated: Apr 15, 2026

High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications
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An improved X-ray diffraction method for cellulose crystallinity measurement.

Xiaohui Ju1, Mark Bowden2, Elvie E Brown1

  • 1School of Chemical Engineering and Bioengineering, Washington State University, Richland, WA 99354, United States.

Carbohydrate Polymers
|April 7, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a refined X-ray diffraction technique for accurately measuring the cellulose crystallinity index (CrI). The modified method enhances reliability for cellulose materials and related polymorphs.

Keywords:
Cellulose crystalliteCellulose polymorphsCrystallinity indexNanocrystalline celluloseX-ray diffraction

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Polymer Science

Background:

  • Cellulose crystallinity is crucial for material properties.
  • Accurate measurement of cellulose crystallinity index (CrI) is challenging.
  • Existing methods may lack precision or applicability.

Purpose of the Study:

  • To develop a modified X-ray diffraction (XRD) method for precise determination of cellulose crystallinity index (CrI).
  • To establish a more reliable approach for measuring CrI in nanocrystalline cellulose (NCC) and potentially other cellulose forms.

Main Methods:

  • Utilized X-ray diffraction (XRD) on nanocrystalline cellulose (NCC) from bleached wood pulp.
  • Applied Rietveld refinement with March-Dollase preferred orientation correction.
  • Identified three distinct amorphous peaks for CrI calculation.
  • Optimized the 2 theta range from 10° to 75° for analysis.

Main Results:

  • A modified XRD method was successfully developed and validated.
  • The new method allows for more reliable CrI determination.
  • Identified optimal 2 theta range (10°-75°) for CrI, d-spacing, and crystallite size analysis.
  • Consideration of preferred orientation improved accuracy.

Conclusions:

  • The modified XRD method provides a more reliable measurement of cellulose crystallinity index (CrI).
  • This technique may be extended to analyze other cellulose polymorphs.
  • The method enhances the understanding of cellulose structural parameters.