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Advancements in the Supercritical Water Hydrothermal Synthesis (scWHS) of Metal Oxide Nanoparticles
Published in Matthew Laudon, Bart Romanowicz, 2007 Cleantech Conference and Trade Show Cleantech 2007, 2019
Edward Lester*, Paul Blood, Jun Li, Martyn Poliakoff
Copper oxide (mixed CuO and CuO2) particles can be used as an antimicrobial agent, in wood preservation, conductive inkjet printing and in pigments. By using copper formate as the metal salt precursor at a concentration of 0.01M, nanoparticles around 50nm can be produced continuously (see Figure 5).
Impact Loading of Solid/Porous Media
Published in A. G. Mamalis, D. E. Manolakos, A. Szalay, G. Pantazopoulos, Processing of High-Temperature Superconductors at High Strain Rates, 2019
A. G. Mamalis, D. E. Manolakos, A. Szalay, G. Pantazopoulos
For the preparation of the YBCO-type ceramic powders, the solid-state reaction technique, e.g., the ceramic method was used. The powder mixture, with the nominal composition of YBa2–xKxCu3Oy (x = 0–0.1), was prepared by using stoichiometric quantities of Y2O3, Ba(OH)2 · 8H2O, KF · 2H2O, CuO and AgNO3. The mixture of these materials was ground with a pestle in an agate mortar and homogenized by adding alcohol. Copper oxide (CuO) was obtained by the calcination of Cu(OH)2 · CuCO3 · nH2O.
Recent progress in the development of backplane thin film transistors for information displays
Published in Journal of Information Display, 2023
Gwon Byeon, Seong Cheol Jang, Taewan Roh, Ji-Min Park, Hyun-Suk Kim, Yong-Young Noh
Copper oxide has two common forms: cuprous oxide or cuprite (Cu2O) and cupric oxide or tenorite (CuO). Both copper oxides are generally p-type semiconductors, and Cu2O shows higher mobility than CuO. By doping Ga, which presents high-oxygen affinity, the Cu2O film decreases oxygen vacancy (Vo) during the reduction [27]. By reduction, Cu2O TFT improved overall TFT performance, such as field effect mobility, on/off ratio, threshold voltage, and subthreshold swing. Also, there are some reports about copper oxide TFT fabricated by ALD. Wanjoo et al. examine the CuOx TFT fabricated by the ALD process with the precursor of hexafluoroacetylacetonate Cu(I)(3,3-dimethyl-1-butene)[(hfac)Cu(I)(DMB)] and reactant of ozone gas (O3) [28]. The XPS results indicate that the Cu2+ bonding state increases during the annealing temperature of 300 °C, which means the formation of Cu2O. Here, the mobility of CuOx TFT results in 5.64 cm2/Vs.
Thermocatalytic upgrading and viscosity reduction of heavy oil using copper oxide nanoparticles
Published in Petroleum Science and Technology, 2020
Yi-Tang Zhong, Xiao-Dong Tang, Jing-Jing Li, Tian-Da Zhou, Chang-Lian Deng
Copper oxide is an important multifunctional fine inorganic material widely used in printing and dyeing, ceramics, glass, and medicine. At the same time, as the main component of catalytic agent, copper oxide has been widely used in many catalytic reactions such as oxygenation, hydrogenation reduction, and hydrocarbon combustion (Yoosefi Booshehri, Wang, and Xu 2015). In the oil industry, Chen et al. (2019) developed an in-situ synthesis strategy for preparing well-dispersed CuO nanoparticles as aquathermolysis catalyst for viscosity reduction in heavy oil. Tang et al. (2017) studied that catalytic effect of in-situ preparation of CuO nanoparticles on the heavy oil low-temperature oxidation (LTO) process in air injection. In this paper, CuO nanoparticles were synthesized with moderate reaction conditions via non-hydrothermal synthetic method, and its properties were characterized. It was studied as catalysts to take part in the thermocatalytic upgrading process of heavy oil.
Effect of copper chloride layer on the oxidation-sulfation resistance of copper at 200°C
Published in Canadian Metallurgical Quarterly, 2020
A copper-oxide system contains two stable oxides at high temperatures – Cu2O and CuO. Cu2O is protective and its growth follows parabolic kinetics [7,8]. In contrast, CuO is non-protective, i.e. excessive formation changes the oxidation from parabolic to having a breakaway-like behaviour [9]. Oxide layers develop on metal surfaces by layering stable metal oxides in descending order of the metal/oxygen ratio in the oxide. The formation of an oxide layer on copper involves some precursor states so that the oxidized copper contains thin successive layers of CuxO/Cu2O/Cu3O2/CuO. The oxidation of copper starts with a CuxO precursor that further oxidizes to Cu2O, which nucleates and grows along the surface [10] forming a protective oxide film. At ambient temperature, Cu2O is the prevalent phase. When copper is further oxidized, Cu2O forms CuO either directly or via Cu3O2. The metastable Cu3O2 has been detected at temperatures between 120 and 160°C [11,12]. CuO develops at temperatures exceeding 200°C at sufficiently high oxygen pressures, the maximum amount of CuO occurs between 300 and 500°C and then decreases again at higher temperatures [7].