As the only solid detonation product of CHNO negative oxygen balance explosive, the condensed carbon plays an important role in the energy-releasing and working capability by coagulation and phase transition. But the process of condensed carbon transformation has always been controversial because the detonation is so fast and the carbon phase is so complex (amorphous phase, graphite phase, diamond phase, liquid phase, etc.), that spatial and temporal resolution of existing test techniques is difficult to meet the requirements of quantitative analysis. If we can accurately understand the phase transition and coagulation process of carbon condensation during detonation, we can provide effective reference data for the accurate evaluation of explosive energy release process and damage effect, rational design of formula, and accurate correction of non-ideal explosive detonation model.

The stimuli-response behavior of energetic materials is strongly affected by the defects in crystals. Improving the performance of energetic materials through defect structure engineering is an effective but challenging method. Herein, we report a strategy for the defect regulation of LLM-105 crystals based on their response to external stimuli. The low-dimensional defects randomly distributed in crystals are proven to result in the premature decomposition of LLM-105, thereby reducing its thermal stability. With this property, the density of low-dimensional defects can be controllably decreased through a suitable heat treatment process, resulting in the emergence of voids and cracks in LLM-105 crystals. It is shown that the response of different types of defects to the external stimuli is selective. These changes in the defect structure of LLM-105 not only significantly enhance its thermal stability but also improve its initiation property and wettability, making LLM-105 one of the most attractive initiating explosives. Thus, the ability to tune explosive performance via defect engineering is shown in this work.

No abstract

Based on the VHL equation of state(EOS) described by the L-J potential function, the water in the high-temperature situation is depicted by medium-high pressure thermodynamic states. The L-J potential function parameters of water adopt a temperature-dependent function form, and by using complex configuration optimization method, the specific value is obtained from the date in NIST during the range of 800K-1275K and 0.1GPa-1.0GPa. In order to test the suitability of VHL equation of state in high -temperature and medium-high pressure state, the theoretical and experimental data of higher temperature and pressure range are investigated. What’s more, the theoretical calculation results of VLW, DMW, BS and TIP4P equations of state are compared. The results show that, during the high-temperature and medium-high pressure section, the volumetric error of water calculated by VHL equation of state is less than 7%. Considering the uncertainty of the experimental data, it can be thought that the VHL equation of state and the temperature-dependent potential function form proposed in this paper can describe the state of water in high temperature, medium-high pressure better.

No abstract