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Contrast Variation Small Angle Neutron Scattering Investigation of Micro- and Nano-Sized TATB
Panqi Song1,2, Xiaoqing Tu2, Liangfei Bai3
1School of Chemistry and Chemical Engineering, Beijing Institute of Technology (BIT), Beijing 100081, China.
Materials (Basel, Switzerland)
|August 21, 2019
Summary
Small angle neutron scattering (SANS) revealed distinct fractal properties in micro/nano-sized 1,3,5-triamino-2,4,6-trinitrobenzene (TATB). Nano-TATB exhibits increased porosity and surface fractal structures compared to micro-TATB.
Area of Science:
- Materials Science
- Neutron Scattering Physics
- Nanotechnology
Background:
- Understanding the microstructural features of energetic materials like 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) is crucial for predicting their properties.
- Particle size significantly influences the morphology and porosity of TATB crystallites.
- Characterizing complex pore structures requires advanced scattering techniques.
Purpose of the Study:
- To investigate the fractal behavior and embedded porosity of micro/nano-sized TATB.
- To determine the effect of particle size on the microstructural features of TATB.
- To evaluate the utility of small angle neutron scattering (SANS) with contrast variation for microstructural analysis.
Main Methods:
- Small angle neutron scattering (SANS) with contrast variation.
- Analysis of fractal dimensions (surface and volume) of TATB crystallites.
- Estimation of specific surface areas using Porod law and comparison with Brunauer-Emmett-Teller (BET) measurements.
Main Results:
- Micro-sized TATB shows smooth external surfaces and surface fractal pore structures (DS: 2.15-2.25).
- Nano-sized TATB exhibits surface fractal external surfaces (DS: 2.36-2.55) and a two-level volume fractal pore structure.
- Nano-TATB displays a distinct increase in void volume fraction and specific surface area compared to micro-TATB.
- SANS contrast variation effectively differentiated internal void information from external surfaces.
Conclusions:
- SANS is a powerful tool for characterizing the microstructural features of energetic materials.
- Particle size critically impacts the fractal nature and porosity of TATB.
- Established relationships between microstructural characteristics and material properties can be achieved through SANS analysis.
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