Material Processing
Ajay Kumar Baranwal; D P Mondal; Rajeev Kumar
Abstract
Lightweight Ni-Ti alloy foam has received immense attention as a promising material for sensors, actuators, dampers, biomedical implants, and energy absorption applications due to their outstanding properties including low density, high surface area, corrosion resistance and excellent mechanical strength. ...
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Lightweight Ni-Ti alloy foam has received immense attention as a promising material for sensors, actuators, dampers, biomedical implants, and energy absorption applications due to their outstanding properties including low density, high surface area, corrosion resistance and excellent mechanical strength. In the present study, we developed Ni (50)-Ti (50) alloy foams with varying porosities using NaCl as a space holder. The cold compacted mixture of NiTi alloy powder, NaCl granules, and 2 wt% polyvinyl alcohol (PVA) solutions are mixed uniformly in a globe box for 8 hrs. Sintering is carried out in two stages: firstly, at 900 oC for 2 hrs and then at 1100 oC for two hrs. During sintering, NaCl gets melted and removed from the foams. The Ni-Ti alloy foams exhibit an excellent compressive strength of 48 MPa at a relative density (ρrd) of 0.45. It also provides higher plateau stress, greater strain hardening effect, and larger strain recovery. Thus, the lightweight high strength Ni-Ti alloy foam is a promising material for bone implants and energy absorption applications.

Dan Xu; Winston Duo Wu
Abstract
Hydrogen is one of the most promising clean energy because it has a much higher energy density than gasoline and emits no carbon dioxide after burning. For the application of hydrogen, hydrogen storage is considered as a key technology. Design and synthesis of porous material with high hydrogen storage ...
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Hydrogen is one of the most promising clean energy because it has a much higher energy density than gasoline and emits no carbon dioxide after burning. For the application of hydrogen, hydrogen storage is considered as a key technology. Design and synthesis of porous material with high hydrogen storage capacity should be fully developed at first. However, none of the candidate materials developed so far has meet the DOE target yet. This review aimed to describe the presently major accomplishments and the challenges in the area of hydrogen storage.

Xun Xu; Fangwang Ming; Jinqing Hong; Zhoucheng Wang
Abstract
Graphene-based aerogels with porous structure and three-dimensional (3D) network have attracted plentiful interests recently because they could exhibit as an excellent matrix for various kinds of nanoparticles, thus providing a potential prospect in a variety of applications. In this report, 3D composite ...
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Graphene-based aerogels with porous structure and three-dimensional (3D) network have attracted plentiful interests recently because they could exhibit as an excellent matrix for various kinds of nanoparticles, thus providing a potential prospect in a variety of applications. In this report, 3D composite aerogel with poriferous structure assembly of bismuth tungstate sheets and graphene nanosheets has been prepared by a simple hydrothermal process. The 3D multihole structure of the hybrid aerogel could not only provide enormous surface area, but also facilitate electron transfer and ion transmission which could decrease the electrode internal resistance and consequently improve the capacitive property. As a result, the Bi2WO6/graphene hybrid aerogel achieves a large specific capacitance of 714 F g -1 at the current density of 4 A g -1 . The hybrid aerogel could provide a new method for developing high-performance energy storage materials.
