Southwest University of Science and Technology

About: Southwest University of Science and Technology is a education organization based out in Mianyang, China. It is known for research contribution in the topics: Adsorption & Graphene. The organization has 10017 authors who have published 8923 publications receiving 94850 citations. The organization is also known as: Xīnán Kējìdàxué.

Electronic waste disassembly with industrial waste heat

Abstract: Waste printed circuit boards (WPCBs) are resource-rich but hazardous, demanding innovative strategies for post-consumer collection, recycling, and mining for economically precious constituents. A novel technology for disassembling electronic components from WPCBs is proposed, using hot air to melt solders and to separate the components and base boards. An automatic heated-air disassembling equipment was designed to operate at a heating source temperature at a maximum of 260 °C and an inlet pressure of 0.5 MPa. A total of 13 individual WPCBs were subjected to disassembling tests at different preheat temperatures in increments of 20 °C between 80 and 160 °C, heating source temperatures ranging from 220 to 300 °C in increments of 20 °C, and incubation periods of 1, 2, 4, 6, or 8 min. For each experimental treatment, the disassembly efficiency was calculated as the ratio of electronic components released from the board to the total number of its original components. The optimal preheat temperature, heating source temperature, and incubation period to disassemble intact components were 120 °C, 260 °C, and 2 min, respectively. The disassembly rate of small surface mount components (side length ≤ 3 mm) was 40-50% lower than that of other surface mount components and pin through hole components. On the basis of these results, a reproducible and sustainable industrial ecological protocol using steam produced by industrial exhaust heat coupled to electronic-waste recycling is proposed, providing an efficient, promising, and green method for both electronic component recovery and industrial exhaust heat reutilization.

Hunting for advanced high-energy-density materials with well-balanced energy and safety through an energetic host–guest inclusion strategy

Abstract: In the development of advanced high-energy-density materials (HEDMs), the traditional strategy of integrating oxidant and fuel components into an organic molecule makes it very difficult to balance the energy and safety of materials. Herein, we present an intermolecular host–guest inclusion strategy for constructing advanced HEDMs with well-balanced energy and safety. By gradually introducing high-energy oxidants into the supramolecular voids of the deliberately selected energetic host crystal, three host–guest inclusion HEDMs (i.e., HGI-1, HGI-2 and HGI-3) were prepared, which show detonation performances separately comparable to those of three classical HEDMs, namely RDX, HMX and e-CL-20, but with mechanical sensitivities that are much superior to those of these classical HEDMs. In addition, these self-assembled HEDMs have excellent combustion properties and exhibit great potential as high-energy low signature propellants. This presented host–guest inclusion strategy shows enormous potential for tailoring the energy and sensitivity of energetic materials and will accelerate the development of advanced HEDMs in the future.