nano-sized γ-al2o3 was synthesized successfully by a simple method using al2(so4)3·18h2o as aluminium source and in the presence of polyethylene glycol (peg 2000). ftir spectroscopy, x-ray diffraction (xrd), scanning electron microscope (sem) and transmission electron microscope (tem) were used to characterize the structure and morphology of synthesized powder. the results showed that peg playe...

Polyethylene is one of the most used solid state insulators in electrical power industry. It particularly to electrically insulate high-voltage cables. Under stresses associated with AC supplies, this material undergoes ageing, which often treeing. thought that phenomenon starts from gaseous defects embedded insulator bulk, leading formation a cluster cavities. Treeing able dig matrix until com...

Molecular dynamics simulations are carried out on the isothermal crystallization process of single polyethylene chains with different chain lengths on the single wall carbon nanotube. This process is summarized as two steps, i.e., adsorption and orientation, and the bond-orientational order parameter is used to show the details of this process. The results show that the attractive van der Waals...

INTRODUCTION Highly crosslinked polyethylenes were introduced for hip arthroplasty more than 10 years ago [1]. The creation of highly crosslinked polyethylenes involves irradiation of the material followed by annealing or remelting. Higher doses of irradiation are desirable because it provides a sufficient level of cross-linking for wear reduction, which is why highly crosslinked polythethylene...

A dual mobility acetabular component has a structure that combines a polyethylene liner and a femoral head, unlike the general design of acetabular cups, making the dissociation of a polyethylene liner highly unlikely. In addition, it increases the range of motion and reduces the possibility of dislocations by increasing a jump distance. A fifty-one-year-old male who had received total hip arth...