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ROY Crystallization on Poly(ethylene) Fibers, a Model for Bed Net Crystallography
Bryan Erriah1, Alexander G Shtukenberg1, Reese Aronin1
1Department of Chemistry and Molecular Design Institute, New York University, New York, 29 Washington Place, New York City, New York 10003, United States.
Chemistry of Materials : a Publication of the American Chemical Society
|March 18, 2024
Summary
Insecticide blooming on bed nets is complex. Researchers identified six crystalline forms of ROY on poly(ethylene) fibers, crucial for understanding and improving insecticide efficacy.
Area of Science:
- Materials Science
- Crystallography
- Entomology
Background:
- Long-lasting insecticidal bed nets (LLINs) rely on insecticides incorporated into poly(ethylene) fibers.
- Insecticide molecules bloom to the surface, crystallize, and become bioavailable to disease vectors.
- Insecticidal activity is polymorph-dependent, with higher crystal free energy forms enhancing efficacy.
Purpose of the Study:
- To investigate insecticide crystallization and blooming on poly(ethylene) fibers.
- To characterize the polymorphs formed on fiber surfaces.
- To understand the complex crystallization behavior for improved bed net performance.
Main Methods:
- Used ROY, a highly polymorphous compound, as a model for insecticide crystallization.
- Tracked blooming rates using UV-vis spectroscopy after successive washes.
- Identified and characterized microcrystals using Raman microscopy, scanning electron microscopy, and 3D electron diffraction.
Main Results:
- Observed and identified six crystalline polymorphs of ROY on poly(ethylene) fiber surfaces.
- Demonstrated complex and dynamic crystallization and phase behavior.
- Provided critical crystallographic data on microcrystals formed during blooming.
Conclusions:
- Characterizing insecticide microcrystal polymorphism is essential for optimizing LLIN performance.
- Understanding blooming dynamics and polymorph formation is key to enhancing insecticidal efficacy.
- This study highlights the importance of bed net crystallography for public health interventions.
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