Institutional Repository of Ningbo Institute of Material Technology & Engineering, CAS
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A rosette like carbon structure controlled through ammoniation for superior adsorption of cationic brilliant green dye
No full textThis paper investigates the influence of the structure, composition, pore size distribution and morphology of three carbon materials obtained from the explosion of acetylene gas on the adsorption performance of brilliant green (BG) dye. During the process, Rosette like carbon (RLC) is obtained in the detonation reaction gas with small amount of ammonia. It shows excellent adsorption properties and high reusability. The adsorption capacity is more than twice of C-nN and C-pN at the concentration of BG of 100 mg/L, the maximum monolayer adsorption capacity of 357.32 mg/g, elimination efficiency can reach 88.5% after 10 cycles of adsorbing BG, which is the best adsorption performance among the currently reported carbon materials. The adsorption equilibrium accords with Langmuir isotherm model and falls into single molecular layer absorption. The temperature and pH value selected have little effect on its adsorption capacity. The excellent properties of RLC contribute to an ideal substitute to the existing adsorbents of carbon materials
Passivation behavior of VAlTiCrSi amorphous high-entropy alloy film with a high corrosion-resistance in artificial sea water
No full textThe passivation behavior of a novel VAlTiCrSi amorphous high entropy alloy (HEA) film was investigated in artificial sea-water. The passive film, mainly composed of oxidation state of V, Al, Ti, Cr and Si, was a single-layer amorphous structure with a thickness of similar to 10 nm. By combining the point-defect model theory, the more excellent corrosion-resistance of HEA film than that of 304 stainless steel, is attributed to its complex composition. During the rupture process of the passive film, the CI mainly react with Cr element, and other elements except Cr work against the rupture process in some sense
Controlling the secondary assembly of porous anionic uranyl-organic polyhedra through organic cationic templates dagger
No full textHerein, we report a new uranyl-organic polyhedron U4L4 (L = BTPCA) assembled from uranyl and a semirigid tritopic ligand. By adjusting the carbon chain length of organic templates, two complexes can be obtained based on the diverse secondary assembly of U4L4 cages. The mechanism of different arrangements of U4L4 cages induced by organic templates was explored in detail
Spatholobus discolor , a new synonym of Craspedolobium unijugum (Fabaceae)
No full textCraspedolobium schochii Harms was described in 1921 and has thin woody, flat, dehiscent pods with a narrow wing on the upper suture, which are quite different from those of other genera within the same tribe Millettieae (Fabaeceae), but its flowering materials from Laos and Thailand were described respectively as Millettia unijuga Gagnep. in 1913 and as Pueraria rigens Craib in 1927. Due to the priority of the Shenzhen Code, its correct name was accepted as Craspedolobium unijugum (Gagnep.) Z. Wei & Pedley as recently as 2010. The results of critical examination of specimens, literature and living plants in the wild showed that Spatholobus discolor C. F. Wei, a species described on the basis of one flowering collection from China, is also conspecific with C. unijugum. We therefore reduce S. discolor to the synonymy of C. unijugum herein. Additionally, we designated the second-step lectotype of the name C. schochii, and further found that Craspedolobium is a new genus record for the flora of Vietnam
3D Thermal Network Supported by CF Felt for Improving the Thermal Performance of CF/C/Epoxy Composites
No full textThe heat generated by a high-power device will seriously affect the operating efficiency and service life of electronic devices, which greatly limits the development of the microelectronic industry. Carbon fiber (CF) materials with excellent thermal conductivity have been favored by scientific researchers. In this paper, CF/carbon felt (CF/C felt) was fabricated by CF and phenolic resin using the airflow network method, needle-punching method and graphitization process method. Then, the CF/C/Epoxy composites (CF/C/EP) were prepared by the CF/C felt and epoxy resin using the liquid phase impregnation method and compression molding method. The results show that the CF/C felt has a 3D network structure, which is very conducive to improving the thermal conductivity of the CF/C/EP composite. The thermal conductivity of the CF/C/EP composite reaches 3.39 W/mK with 31.2 wt% CF/C, which is about 17 times of that of pure epoxy
Combined effect of various elastic loading conditions and aerobic bacterium Pseudoalteromonas sp. on the corrosion behavior of S32750 super duplex stainless steel
No full textThe combined effect of various elastic loading conditions and aerobic bacterium Pseudoalteromonas sp. on the corrosion behavior of S32750 super duplex stainless steel was investigated using electrochemical and surface analysis methods. Our results show that the combined influence is a nonlinear relationship between both parameters. The corrosion rate of S32750 SDSS under the combined effect is higher than the sum of the corrosion rate under elastic loading and under aerobic bacterium. The loading condition of sigma(0.5s) in the presence of Pseudoalteromonas sp. caused to more harmful effects than the loading of sigma(0.75s) with bacteria
Mechanical Analysis and Experimental Studies of the Transverse Strain in Wrinkled Metallic Thin Films
No full textThe wrinkling structures, which can greatly improve the stretchability of the metallic thin films, have been widely used in the preparation of stretchable devices. However, the artificial wrinkling structures are often accompanied by the generation of microcracks, which seriously affect the performance of the devices. In this work, by establishing the corresponding model, the transverse strain of the longitudinally prestrained continuous film and the strip film is mechanically analyzed, which is verified by experimental results; for the strain of blank substrate, the error of the model was about 3.7%. It is difficult to avoid the generation of microcracks with continuous films, but strip films can avoid the generation of microcracks to a certain extent. The experimental results illustrate the various factors affecting the generation of microcracks. The transverse strain of the film is proportional to the substrate's Young's modulus, Poisson's ratio, thickness, and prestrain and is basically inversely proportional to the strip film's Young's modulus, thickness, and strip interval. Our results provide deeper knowledge for choosing proper metallic materials to fabricate stretchable wrinkled devices
In situ generated micro-bubbles enhanced membrane antifouling for separation of oil-in-water emulsion
No full textMembrane fouling has been considered as the greatest challenge for membrane separation especially in oil/water separation process. Novel strategies for reducing membrane fouling are highly important for membrane separation. In this study, a novel membrane antifouling method in oil/water separation was proposed through in situ generated micro-bubbles. The fouling reduced process was realized by combination of membrane separation and catalytic reaction. Oxygen micro-bubbles were in situ generated by the decomposition of hydrogen peroxide (H2O2 ) under the catalysis of manganese oxide nanoparticles, which were loaded on the surface of carbonized PAN (cPAN) nanofibrous membrane. In situ generated micro-bubbles significantly inhibited the surface deposition of rejected oils through hydrophobic interaction between micro-bubbles and oils. Membrane permeability was significantly reduced to 909 +/- 286 Lm(-2) h(-l) bar(-1) (3% of its initial data) after 65 min of continuous oil-inwater separation. However, it remains as high as 14755 +/- 1930 Lm(-2) h(-l) bar(-1) (67.6% of initial data) with the presence of H2O2, which was 16.2 times higher. The current study presents a potential approach to achieve continuous oil/water emulsion separation with reduced membrane fouling and advance the practical application of membranes for oil/water separation
A facile method of selective dissolution for preparation of Co3O4/LaCoO3 as a bifunctional catalyst for Al/Zn-air batteries
No full textPerovskites are promising catalysts for metal-air batteries because of their excellent intrinsic catalytic activities. However, low specific surface area and fewer surface defects lead to low catalytic activities in the oxygen reduction/evolution reaction (ORR/OER). Herein, the Co3O4/LaCoO3 composite material is prepared by a selective dissolution method. The onset and half-wave potentials of the Co3O4/LaCoO3 hybrid material are 0.895 and 0.640 V during the ORR process. It also exhibits a small overpotential of 503 mV at a current density of 10 mA cm(-2) for the OER process. What's more, the Zn-air battery that uses the Co3O4/LaCoO3 hybrid material can reach a maximum power density of 155.7 mW cm(-2), which is larger than that of the original LaCoO3 (137.8 mW cm(-2)). In addition, the potential difference of this battery with the Co3O4/LaCoO3 sample increased by 22 mV after 100 charge-discharge cycles, which is much lower than that of Zn-air batteries with the LaCoO3 and Co3O4 samples (52 and 26 mV). The above results illustrate that improved bifunctional catalytic properties of the Co3O4/LaCoO3 hybrid material can be associated with the porous structure, large surface area, weak Co-O bond in the lattice and more surface defects on the surface
Epoxy composites with high cross-plane thermal conductivity by constructing all-carbon multidimensional carbon fiber/graphite networks
No full textIn the new era of 5th generation mobile networks (5G), electron devices need to reach high power, frequency and transmission rate (Gbit/s) so as to dedicate to the 4K video, Virtual Reality, low latency communication, Internet of Things and so on. However, excess heat generated in devices has become a critical bottleneck to influence reliability and performance. Polymer composites with high thermal conductivity (K), low cost and light weight are urgently required for thermal management application. In this paper, all-carbon networks composed of 1D carbon fibers and 2D graphite sheets were constructed to reinforce epoxy at low addition by air flow technology and solution dipping strategy. The all-carbon networks show anisotropic structure, polymer composites have high cross-plane K up to 6.2 W/(m.K) with 17.48 vol% CFs and only 6.34 vol% graphite adhesive. The all-carbon networks could also improve the thermostability and electrical conductivity. Furthermore, the polymer composites with all-carbon networks display strong thermal management capability as observed by thermal infrared imaging. The epoxy composites demonstrate strong potential as interface materials integrated in electronic devices for heat dissipation and composites for aerospace and electromagnetic shielding