Baowei Qiu,Long Ni,Xueqin Zhang,Yang Chen,Shengtai Zhou,Zhengguang Heng,Mei Liang,Huawei Zou
The properties of fiber–matrix interfaces are one of the most important factors that influence the performance of carbon fiber-reinforced polymer (CFRP) composites. Therefore, it is necessary to strengthen the interfacial adhesion between carbon fibers (CFs) and the matrix to obtain composites with excellent properties and meet the future demand for advanced composites. Inspired by Humulus scandens, graphene oxide (GO) was introduced on the surface of CFs to build a barb structure. The structure could achieve a mechanical interlock between CFs and the matrix to obtain good interfacial properties. Most remarkably, the bionic structure could not only effectively enhance the interfacial properties, but also deflect the direction of interfacial crack propagation as supported by detailed micro- and macro-characterizations. Compared with the original CFs, both the interlaminar shear strength (ILSS) and interfacial shear strength (IFSS) of treated CFs increased by 49.20% and 54.93%, respectively. Above all, this work verified that the bionic structure has a good effect on the interface, and paves a new path to explore the enhancement methods of the interface.
Jinhao Zhao,Zhongyan Wang,Zhongshan Li,Jiayu Shi,Ling Meng,Guorong Wang,Jingli Cheng,Yongjun Du
Aphids are among the most destructive phytophagous pests of host plants, because of their rapid reproduction, parthenogenesis, extensive crop damage, and the transmission of many plant viruses. Since lady beetles are important predatory natural enemies of aphids, developing lady beetle attractants to increase their field abundance is vital for aphid control. Floral volatiles and other semiochemicals are reportedly attractive to lady beetles. In this research, a total of 58 floral volatiles were tested by Y-tube olfactometer assays, among which 29 were highly attractive to both Harmonia axyridis (Coleoptera: Coccinellidae) and Coccinella septempunctata (Coleoptera: Coccinellidae). Meanwhile, the results of wind tunnel trials showed that only isoamyl acetate, α -humulene, trans -3-hexen-1-ol, methyl salicylate, and β -pinene lure these two species. Thereafter, 15 semiochemicals from pests, natural enemies, and pest-infested crops were mixed with the selected floral volatiles, to determine optimum formulations for attracting lady beetles through wind tunnels and further field trials. Eventually, formulas (1) α -humulene: β -pinene: methyl salicylate: trans -3-hexen-1-ol = 1:3:3:10; (5) α -humulene: β -pinene: methyl salicylate:1-nonanal = 1:3:3:10; (8) α -humulene: β -pinene: methyl salicylate: indole = 1:3:3:10 ( 1 , 5 , and 8 are labels used for the various formulations in field trials) were successfully verified to be attractive to lady beetles in both pumpkin and wheat fields. These formulations will be of great significance in developing integrated pest management strategies for aphid control.
危险品化学品经营许可证（带存储）