Heterogeneous catalysis is vital for a number of chemical, refinery and pollution control processes. The use of catalyst pellets of hollow cylindrical shape provide several distinct advantages over other common shapes, and can therefore help to enhance conversion levels in reactors. A better utilization of the catalytic material is probably most notable of these features due to the absence of t...

In most materials, there exists a coupling effect between heat and moisture during their transient diffusion. In particular, the coupling effect gives a significant change in the distributions of temperature and moisture concentration in some porous materials and resin composites (Chang, et al., 1991). Moreover, it is known that the absorption of moisture by hygroscopic materials under high-tem...

A passive jet flow control method for suppressing unsteady vortex shedding from a circular cylinder via a numerical simulation is presented in this paper. The circular cylinder is wrapped in a hollow pipe. There are a set of the suction/jet holes on the windward side and leeward side of the outer surface of the pipe. The oncoming flow enters into the hollow pipe through the inlet holes and then...

This work aims at proposing a strategy for 3D-printing geopolymer composite structures half-meter scale, without using organic additives. An original printing device based on cartridges is developed and adapted to 6-axis robot. The yield stress, working time apparent Young modulus of the extruded material are measured. A devoted software, procedure path set up, leading fabrication structure hei...

This article presents the analysis of functionally graded thick hollow cylinders under dynamic load. The functionally graded cylinder is assumed to be made of many subcylinders. Each subcylinder is considered as an isotropic layer. Material’s properties in each layer are constant and functionally graded properties are resulted by suitable arrangement of layers in multilayer cylinder. The proper...

This work aims to shape a hollow cylinder with geopolymer and an additive manufacturing process (3D printing) without organic additives. The formulation of composite using only mineral parts is proposed the parameters 3D printing were optimized. mechanical properties, microstructure, adhesion layers material analysed compared literature. results showed that could be printed addition small ratio...

Citation: Zheng J, Yan P, Gu M, Wagner MJ, Hays KA, Chen J, Li X, Wang C, Zhang J-G, Liu J and Xiao J (2015) Interfacial reaction dependent performance of hollow carbon nanosphere – sulfur composite as a cathode for Li-S battery. Front. Energy Res. 3:25. doi: 10.3389/fenrg.2015.00025 Interfacial reaction dependent performance of hollow carbon nanosphere – sulfur composite as a cathode for Li-S ...

Spray-drying and the nanoscale Kirkendall diffusion process are used to prepare nickel sulfide hollow nanospheres/reduced graphene oxide (rGO) composite powders with excellent Na-ion storage properties. Metallic Ni nanopowder-decorated rGO powders, formed as intermediate products, are transformed into composite powders of nickel sulfide hollow nanospheres/rGO with mixed crystal structures of Ni...