Month: December 2022

Chemical recovery of spent copper powder in laser powder bed fusion was written by Speidel, Alistair;Gargalis, Leonidas;Ye, Jianchao;Matthews, Manyalibo J.;Spierings, Adriaan;Hague, Richard;Clare, Adam T.;Murray, James W.. And the article was included in Additive Manufacturing in 2022.Category: copper-catalyst This article mentions the following:

In laser powder bed fusion (LPBF), recovered unfused powder from the powder bed often degrades upon sequential processing through mechanisms like thermal oxidation and particle satelliting from ejected weld spatters and particle-laser interactions. Given the sensitivity of LPBF performance and build quality to powder properties, spent powder is generally discarded after a few build cycles, especially for materials that are sensitive towards surface oxidation This increases feedstock material costs, as well as costs associated with machine downtime during powder replacement. Here, a new method to chem. reprocess spent LPBF metal powder is demonstrated under ambient conditions, using a heavily oxidized Cu powder feedstock recovered from prior LPBF processing as a model material. This is compared to an equivalent virgin Cu powder. The near-surface powder chem. has been analyzed, and it is shown that surface oxide layers present on spent Cu powder can be effectively reset after rapid reprocessing (from 5 to 20 min). Diffuse reflectance changes on etching, reducing for gas-atomised virgin Cu powder due to the formation of anisotropic etch facets, and increasing for heavily oxidized spent Cu as the highly absorptive oxide layers are removed. The mechanism of powder degradation for moisture sensitive materials like Cu has been correlated to the degradation of LPBF deposits, which manifests as widespread and extensive porosity. This extensive porosity is largely eliminated after reprocessing the spent Cu powder. Chem. etched spent powder is therefore demonstrated as a practical feedstock in LPBF in which track d. produced is comparable to virgin powder. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Category: copper-catalyst).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. The applications of Copper-based nanoparticles have received great attention due to low toxicity and inexpensive, earth-abundant. Copper of different valence states can be used to catalyze the coupling reaction, especially the Ullmann coupling reaction. Category: copper-catalyst

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Mechanism of germanium doping in sphalerite on copper ion activation: A DFT study was written by Sheng, Jie;Liu, Quanjun;Dong, Jingshen;Subhonqulov, S. H.;Gao, Yalong;Liu, Meilin. And the article was included in Chemical Physics in 2022.Related Products of 20427-59-2 This article mentions the following:

In this study, d. functional theory was used to calculate the activation of Cu ions on germanium-bearing sphalerite (1 1 0) surfaces and the difference in the activation of Cu ions in sphalerite with different Ge concentrations The results show that, with an increase in Ge content, the projected d. of states on the germanium-bearing sphalerite (1 1 0) surface moves toward lower energy, and the energy gap between the Cu 3d and S 3p orbitals on the surface of the germanium-bearing sphalerite becomes larger, and the covalency and bonding strength of the Cu-S bond weaken. Through calculation and anal. of three different Cu activation models, namely Cu substitution, Cu(II) adsorption, and Cu(OH)2 adsorption, it is concluded that an increase in Ge content can hinder the Cu activation of sphalerite and can adversely affect the recovery of sphalerite and the enrichment of valuable elements in the flotation process. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Related Products of 20427-59-2).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. Copper has continued to be one of the most utilized and important transition metal catalysts in synthetic organic chemistry. Copper nanoparticles can also catalyze the coupling reaction of nitrogen-containing nucleophiles, phenols, thiols, xanthogenates, selenium ruthenium nucleophiles and the like.Related Products of 20427-59-2

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Spectacular Behavior of a Viscoelastic Droplet Impinging on a Superhydrophobic Mesh was written by Abouei Mehrizi, Abbasali;Lin, Shiji;Sun, Lijie;Chen, Longquan. And the article was included in Langmuir in 2022.Electric Literature of CuH2O2 This article mentions the following:

Spray formation using the droplet impact on the superhydrophobic mesh surfaces is particularly important due to its application in different industries. The present study revealed that adding a trivial amount of the poly(ethylene oxide)s (PEO) polymer to the water droplet can considerably change the impact phenomena on the superhydrophobic mesh surfaces and suppress the spray formation. Droplet rebound is only observed in a narrow range of impact velocities of PEO aqueous droplets when the tiny filaments still connect the surface and droplet. Rebound suppression and deposition of the PEO aqueous droplet is attributed to the higher interaction between the polymer chains and the superhydrophobic mesh surface. After a critical impact velocity and We number which is independent of the PEO concentration, the liquid penetrates the mesh pores. The penetrated liquid formed the ligaments that grow until they reach the maximum length and surprisingly retract back to the mesh surface and the mother droplet. The ligaments destabilized at low PEO concentrations (c = 0.5, 1 g/L) and mesh opening size H = 357μm to the crest swell droplets when the droplet size is reduced by increasing the impact velocity. The ligament fragmentation and droplet detachment are only observed at high impact velocities when c = 0.5, 1 g/L, and H = 357μm. The result shows that the PEO additive does not significantly affect the maximum spreading dynamics. An empirical model to calculate the maximum spreading diameter is developed. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Electric Literature of CuH2O2).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. The applications of Copper-based nanoparticles have received great attention due to the earth-abundant, inexpensive and low toxicity. Due to these characteristics, copper nanoparticles have generated a great deal of interest especially in the field of catalysis. Electric Literature of CuH2O2

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Synergistic activation of peroxymonosulfate for efficient aqueous p-nitrophenol degradation with Cu(II) and Ag(I) in Ag₂Cu₂O₃ was written by Yin, Chuankun;Khan, Aimal;Gao, Qiaohui;Li, Quan;Zhou, Xiaoyun;Liu, Xiuying;Xu, Aihua;Li, Xiaoxia. And the article was included in Separation and Purification Technology in 2022.Electric Literature of CuH2O2 This article mentions the following:

Recently, the development of efficient mixed metal oxide catalysts for organic pollutants degradation via peroxymonosulfate (PMS) activation is a hot topic in the area of wastewater treatment. In this work, the silver-copper mixed-oxide, Ag₂Cu₂O₃ (ACO) was reported for the first time as a highly active catalyst for removing organic pollutants in the presence of PMS. ACO was successfully synthesized from Ag⁺ and Cu²⁺ ions at 60°C, and its structure was strongly influenced by the temperature The catalyst could almost completely remove p-nitrophenol and other pollutants with 0.65 mM PMS after 20 min, and also exhibited satisfactory stability and recyclability. The system efficiency was shown to vary with the concentration of PMS and catalyst, as well as solution pH. Scavenger experiment and EPR anal. indicated that radicals produced by the oxidation of Ag(I) and Cu(I) with PMS could promote degradation reaction. The synergistic effect between Cu and Ag in the bimetallic catalyst was demonstrated to contribute to the high performance: Cu(II)-O-Ag(I) bonds promote the conversion of Cu(II) species to Cu(I) through reaction with PMS, and facilitate the oxidation of Cu(I) and Ag(I) by PMS to generate active radicals. The study provides a feasible strategy to design efficient and stable bimetal oxide catalysts for PMS activation. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Electric Literature of CuH2O2).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. The applications of Copper-based nanoparticles have received great attention due to low toxicity and inexpensive, earth-abundant. Copper nanoparticles can also catalyze the coupling reaction of phenols, thiols, xanthogenates, nitrogen-containing nucleophiles, selenium ruthenium nucleophiles and the like.Electric Literature of CuH2O2

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Recovery of copper from printed circuit board (PCB) acidic etching wastewater: Ammonia regulates the crystallization of high valued copper salt was written by Guo, Yi;Zheng, Jiayi;Yan, Xu;Liu, Xueming;Xu, Wenbin;Liu, Weizhen;Li, Xiaoqin;Lin, Zhang. And the article was included in Surfaces and Interfaces in 2022.Electric Literature of CuH2O2 This article mentions the following:

In electronic and elec. industries, a huge amount of acidic cupric etching wastewater was produced during the manufacture of printed circuit board (PCB). Reclamation of copper is necessary for resource recovery and environmental protection. Herein, ammonia (NH₃·H₂O) and sodium hydroxide (NaOH) were investigated and compared as neutralizers to regulate the sequential crystallization of basic copper chloride (Cu₂(OH)₃Cl), copper hydroxide (Cu(OH)₂), and copper sulfate (CuSO₄·5H₂O). Crystal phase and micro-morphol. were analyzed by X-ray diffraction and scanning electron microscope; product quality was evaluated by laser particle size analyzer, thermogravimetry, and inductively coupled plasma. The results showed that ammonia as the neutralizer can regulate the formation of spherical Cu₂Cl(OH)₃ particles with compact surface, good fluidity, and low moisture-absorption-ability, which can be used as a precursor to producing Cu(OH)₂ and CuSO₄·5H₂O with higher purity. Mechanism anal. revealed that ammonia acts as ‘a storage of OH^– and Cu²⁺‘ in the aqueous phase due to its weak alkalinity and the ability to complex with Cu²⁺ to form stable Cu(NH₃)²⁺n. As a result, OH- and Cu²⁺ were slowly released to the solution and slowed down the crystallization kinetics of copper-containing precipitates This work proposed a promising and harmless resource recycling method, and also inspired the understanding and utilization of metal crystallization law in the ammonia buffer system. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Electric Literature of CuH2O2).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. Transition metal-catalyzed chemical transformation of organic electrophiles and organometallic reagents belong to the most important cross-coupling reaction in organic synthesis. Copper nanoparticles can also catalyze the coupling reaction of phenols, thiols, xanthogenates, nitrogen-containing nucleophiles, selenium ruthenium nucleophiles and the like.Electric Literature of CuH2O2

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”