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We report the world’s first superconducting joint for second-generation GdBa2Cu3O7-δ-coated conductors (2G GdBCO CCs) based on atomic diffusion in GdBCO with partial melting and oxygen diffusion into the oxygen-deficient GdBCO lattices. Producing the superconducting joint requires multiple processes, including fabrication of microholes, peeling off stabilizers, heat treatment and oxygenation annealing. The Ic value of the joined and parent CCs at 77 K are identical, and the initially induced magnetic field of a model coil containing the joint is maintained without decreasing. This method is a unique solution for achieving persistent current mode operation in 2G high-temperature superconducting magnet applications.
Nanoscale functionalized graphenes are fabricated by atomic force microscopy lithography with the desired coverage of a selective functional group using the simple method of the electrical control, and their recovery through moderate thermal treatments. Surprisingly, our controlled coverage of functional groups can reach 94.9% for oxygen and 49.0% for hydrogen, well beyond the coverage achieved by conventional methods.
Hydrogel-based scaffolds are promising biomaterials to deliver cells and small biomolecules to regenerate the cardiac muscle. It is anticipated that cell-loaded hydrogels will potentially be able to mend the broken heart.
Mesocrystals are superstructures with a crystallographically ordered alignment of nanoparticles and posses unique characteristics such as a high surface area, pore accessibility, and good electronic conductivity and thermal stability. This review summarizes the recent developments of metal oxide mesocrystals in the fields of energy conversion and storage.
Oil/water separation, especially emulsified oil/water mixture separation, has become a widespread concern because of the severe fouling problem caused by the easy adsorption of oil droplets onto the surfaces of filtration membranes. Many strategies have been employed to eliminate the fouling problem, but it remains a challenge and impedes the development of membrane technology. In this short review, we discuss the recent development of membrane technology for emulsified oil/water separation. As shown in the image, in addition to polymer- and ceramic-dominated traditional membranes, nanomaterial-based membranes have recently demonstrated their superiority and have achieved high performance.
