Wyniki wyszukiwania - BazTech

1

Laser-Assisted Copper Oxidation

Musztyfaga-Staszuk M., Gawlińska-Nęcek K., Janicki D., Panek P.

Archives of Metallurgy and Materials

|

2020

|

Vol. 65, iss. 2

767--770

EN

The paper proposes a method for copper sheet oxidation by using a laser beam. The thickness of the oxide layer increases with temperature growth; therefore, the proper parameters of the experiment such as pulse power, frequency and the speed of the beam were adjusted. High power diode laser was used in the investigations. The topography of the oxidised copper sheets was determined using atomic force microscopy (AFM) and scanning electron microscopy with EDS analyses. Optical parameters of the deposited layer were characterised by spectrophotometry. Both roughness and thickness of the investigated samples were measured using the confocal laser scanning microscope. The technological recommendations for the laser micro-machining technology to obtain copper sheet oxidation by using the high power laser beam were selected.

2

Synthesis And Characterization Of SiO2, SnO2 And TiO2 Metal Oxide Shells Covering Cu2O Particles

Yu R., Yun J., Kim Y.

Archives of Metallurgy and Materials

|

2015

|

Vol. 60, iss. 2B

1159--1163

EN

In this work is described a means of improving the chemical stability of Cu2O@SiO2, Cu2O@SnO2 and Cu2O@TiO2 materials. The SiO2, SnO2 and TiO2 coated samples were stable from pH 3 to pH 10 for up to seven days. To determine the stability of the coated nanoparticles, and their colloidal solutions under acidic and basic conditions, colloidal nanoparticle solutions with various pH values were prepared and monitored over time. Details of the effect of variations in pH on the phase stability of core-shell type Cu2O were characterized using transmission electron microscopy and X-ray diffraction.

3

Preparation and photocatalytic activity of Cu2O nanoparticles

Lin X. F., Zhou R. M., Zhang J. Q., Sheng X. H.

Materials Science Poland

|

2010

|

Vol. 28, No. 2

504--511

EN

An electron beam irradiation route has been developed for the preparation of Cu2O nanoparticles, with poly(ethylene glycol) (PEG, Mw = 10 000) as a template, and without using a further reducing reagent. Under various synthetic conditions, the composition of Cu2O was changed by adjusting the PEG concentration and pH values of the starting solutions. Transmission electron microscopy data revealed that the morphology evolves from an irregular shape into a sphere and cube with increasing the concentration of PEG, and cube to irregular shape with increasing pH of starting solutions. UV-vis diffuse reflectance spectroscopy data indicated that the Cu2O particles absorbed visible light. The photocatalytic activity of Cu2O was evaluated by studying the decomposition of phenol and methyl orange in aqueous solution under irradiation with visible light.