Al-Cu alloy nano powders have been produced by the electrical explosion of Cu-plated Al wire. The porous nano particles were prepared by leaching for Al-Cu alloy nano powders in 40wt% NaOH aqueous solution. The surface area of leached powder for 5 hours was 4 times larger than that of original alloy nano powder. It is demonstrated that porous nano particles could be obtained by selective leaching of alloy nano powder. It is expected that porous Cu nano powders can be applied for catalyst of SRM (steam reforming methanol).

In this work, the dispersion behavior of particles in binary aluminum (Al)-copper (Cu) cast alloy was investigated with respect to Cu contents of 20 (hypoeutertic), 33 (eutectic) and 40 (hypereutectic) wt.%. In cases of hypo and hypereutectic compositions, SEM images revealed that the primary Al and phases were grown up at the beginning, respectively, and thereafter the eutectic phase was solidified. In addition, it was found that some of particles can be dispersed into the primary Al phase, but none of them are is observed inside the primary 6 phase. This different dispersion behavior of particles is probably due to the difference in the val- ues of specific gravity between particles and primary phases. At eutectic composition, particles were well dispersed in the matrix since there is few primary phases acting as an impediment site for particle dispersion during solidification. Based on the experimental results, it is concluded that particles are mostly dispersed into the eutectic phase in binary Al-Cu alloy system.

The magnetic alloys of Cu-Fe () were prepared by a mechanical alloying method and their structural and magnetic behaviors were examined by X-ray diffraction and Mossbauer spectra. The magnetization curves did not distinctly show the saturation at 70 kOe for the concentrated alloys of . The Mossbauer spectrum of at room temperature shows one Lorentzian line of the paramagnetic phase, whereas the Mossbauer spectrum of consists of sextet Lorentzian line at room temperature and a centered doublet line. The Mossbauer spectra of measured in the temperature ranges from 13 to 295 K, implies that to consists of two magnetic phases. One superimposed sextet corresponds to the ferromagnetic iron in Cu and the other one indicates the superparamagnetic iron rich phase.

The microstructure and mechanical properties of hot-pressed composites with a different sintering temperature have been studied. The size of matrix grain and Cu dispersion in composites increased with increase in sintering temperature. Fracture toughness of the composite sintered at high temperature exhibited an enhanced value. The toughness increase was explained by the thermal residual stress, crack bridging and crack branching by the formation of microcrack. The nanocomposite, hot-pressed at , showed the maximum fracture strength of 707 MPa. The strengthening was mainly attributed to the refinement of matrix grains and the increased toughness.

Copper is able to work as a current collector under wide range of hydrocarbon fuels without coking in Solid oxide fuel cells (SOFCs). The application of copper in SOFC is limited due to its low melting point, which result in coarsening the copper particle. This work focuses on the sintering of copper powder with ceria coating layer. Ceria-coated powder was prepared by thermal decomposition of urea in solution, which containing CuO core particles. The ceria-coated powder was characterized by XRD, ICP, and SEM. The thermal stability of the ceria-coated copper in fuel atmosphere was observed by SEM. It was found that the ceria coating layer could effectively hinder the grain growth of the copper particles

Background : Cu ion is an essential mineral of animal feed. But rapid degradation of Cu ion in animal intestine causes poor immune activity and potential environment hazard. Therefore, to enhance immune system and control metal ion deliverly in intestine, we developed Cu ion nano suspension. In animal feed, > 127 ㎎/g of Cu ion are found but only 5 - 7 ㎎ are used out of them. Therefore, huge loss of Cu ion causes environment, economy and animal health problem. Methods and Results : Seven formulation were prepared to prepare nano suspension (particle size < 200 ㎚) of CuSO4. The particle diameter, polydispersity index, and zeta potential values of the samples were measured using dynamic light scattering (DLS) and laser Doppler methods (ELS-Z1000; Otsuka Electronics, Tokyo, Japan). Absorbance and Cu ion concentration was measured using UV-VIS Spectrophotometer. Cu ion nano particle (< 200 ㎚) was found in a formulation comprised of Cu ion : surfactant (lipophilic : hydrophilic) and PEG. In consistence with this result, total absorbance and concentration was found higher in the same formulation compared to control. Conclusion : From our experiment we may conclude that mixture of Cu ion : surfactant (lipophilic : hydrophilic) and PEG successfully prepared nano suspension which slow down the degradation of Cu ion in intestine with improving feed quality, animal health and prevent potential environment pollution.