Papers by Author: Wei Yao

Abstract: The novel magnetic nanocomposites have been prepared by simultaneous forming of Fe₃O₄ nanospheres and graphene sheets in an anchoring mode and polymerizing of pyrrole on the Fe₃O₄ surface. TEM, XRD and XPS were used to characterize the as-prepared products. Nanocomposites exhibit excellent adsorption capability of 348.4 mg g^-1 for heavy metal Cr (VI) ions, and moreover, are stable, separable easily under external magnetic field and recyclable, retaining about 83.1% of the removal efficiency after four adsorption-desorption cycles. The adsorption isotherm has been studied and shows a good consistency with the Langmuir mode. The nanocomposites could be a good candidate for efficient removal of Cr (VI) from the wastewater.

Abstract: Invar 36 alloy is increasingly used as a structural material for manufacture of liquefied natural gas (LNG) transporters and storage tanks. However, the conventional arc welding of Invar 36 alloy has high susceptibility of hot-cracking. As a high-energy-beam welding process, laser welding could be effective for producing defect-free Invar 36 weld. In the present study, defect-free Invar 36 weld was successfully produced by Nd:YAG laser welding. The microstructure and mechanical properties of weld were also tested.