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Contrast Variation Small Angle Neutron Scattering Investigation of Micro- and Nano-Sized TATB

1
School of Chemistry and Chemical Engineering, Beijing Institute of Technology (BIT), Beijing 100081, China
2
Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, China
3
Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(16), 2606; https://doi.org/10.3390/ma12162606
Received: 13 July 2019 / Revised: 3 August 2019 / Accepted: 14 August 2019 / Published: 16 August 2019
Small angle neutron scattering (SANS) with contrast variation was used to characterize the fractal behavior and embedded porosity of micro/nano-sized 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) crystallites, gauging the effects of particle sizes on the microstructural features. Scattering results reveal that the external surface of micro-sized TATB crystallites are continuous and smooth interfaces and their internal pores display a surface fractal structure (surface fractal dimension 2.15 < DS < 2.25), while the external surface of nano-sized TATB particles exhibit a surface fractal structure (surface fractal dimension 2.36 < DS < 2.55) and their internal pores show a two-level volume fractal structure (large voids consist of small voids). The voids volume fraction of nano-sized TATB particles are found increased distinctively when compared with micro-sized TATB particles on length scale between 1 nm and 100 nm. Specific surface areas are also estimated based on Porod law method, which are coincident with Brunauer-Emmett-Teller (BET) measurements. The contrast variation technique distinguishes the information of internal voids from external surface, suggesting SANS is a powerful tool for determining the microstructural features, which can be used to establish the relationship between microstructures and properties of micro/nano-energetic materials. View Full-Text
Keywords: SANS; contrast variation method; TATB; micro/nano-energetic materials SANS; contrast variation method; TATB; micro/nano-energetic materials
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Song, P.; Tu, X.; Bai, L.; Sun, G.; Tian, Q.; Gong, J.; Zeng, G.; Chen, L.; Qiu, L. Contrast Variation Small Angle Neutron Scattering Investigation of Micro- and Nano-Sized TATB. Materials 2019, 12, 2606.

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