Rapid, nondestructive denim fiber bundle characterization using luminescence hyperspectral image analysis.

Area of Science:

• Analytical Chemistry
• Materials Science
• Spectroscopy

Background:

• Denim fiber identification is crucial for quality control and authentication.
• Traditional methods for fiber analysis can be time-consuming and destructive.

Purpose of the Study:

• To evaluate luminescence-based hyperspectral imaging (LHSI) for discriminating denim fiber bundles.
• To investigate nitromethane (CH3NO2) quenching for improved discrimination and to determine its mechanism.

Main Methods:

• Luminescence spectra (450-850 nm) and images of denim fiber bundles were acquired using 325 nm or 405 nm excitation.
• Data were collected rapidly (<5 s) and analyzed using principal component analysis (PCA) and RGB histograms.
• Nitromethane (CH3NO2) quenching was employed to probe dye molecule accessibility.

Main Results:

• LHSI successfully achieved rapid and unique discrimination of all tested denim fiber bundle types.
• The non-destructive LHSI technique significantly reduced sample preparation time.
• Quenching data indicated varying accessibility of dye molecules to CH3NO2 across different fiber bundles.

Conclusions:

• LHSI is a powerful, rapid, and non-destructive technique for denim fiber bundle identification.
• Nitromethane quenching provides insights into the molecular structure and accessibility of dyes within denim fibers.