Structural modification of hydroxamic acid collectors to enhance the flotation performance of malachite and associated mechanism

2021 ◽  
pp. 117959
Author(s):  
Yuxi Lu ◽  
Kangjing Wu ◽  
Shuai Wang ◽  
Zhanfang Cao ◽  
Xin Ma ◽  
...  
Keyword(s):  
Hydroxamic Acid ◽  
Structural Modification ◽  
Flotation Performance

A novel collector 2-ethyl-2-hexenoic hydroxamic acid: Flotation performance and adsorption mechanism to ilmenite

2015 ◽  
Vol 353 ◽  
pp. 882-889 ◽  
Author(s):  
Haifeng Xu ◽  
Hong Zhong ◽  
Qing Tang ◽  
Shuai Wang ◽  
Gang Zhao ◽  
...  
Keyword(s):  
Hydroxamic Acid ◽  
Adsorption Mechanism ◽  
Flotation Performance

The upgrading of rare earth oxides from iron-oxide silicate rich tailings: Flotation performance using sodium oleate and hydroxamic acid as collectors

2018 ◽  
Vol 29 (12) ◽  
pp. 3163-3172 ◽  
Author(s):  
George Blankson Abaka-Wood ◽  
Massimiliano Zanin ◽  
Jonas Addai-Mensah ◽  
William Skinner
Keyword(s):  
Rare Earth ◽  
Iron Oxide ◽  
Sodium Oleate ◽  
Hydroxamic Acid ◽  
Rare Earth Oxides ◽  
Flotation Performance

Cristal-growth dynamics of n-doped gaAs

1992 ◽  
Vol 50 (2) ◽  
pp. 1544-1545
Author(s):  
Pham V. Huong ◽  
Stéphanie Bouchet ◽  
Jean-Claude Launay
Keyword(s):  
Crystal Growth ◽  
Spatial Resolution ◽  
Epitaxial Layer ◽  
Outer Surface ◽  
Gaas Substrate ◽  
Structural Modification ◽  
Growth Dynamics ◽  
Argon Laser ◽  
High Anisotropy ◽  
Crystal Gaas

Microstructure of epitaxial layers of doped GaAs and its crystal growth dynamics on single crystal GaAs substrate were studied by Raman microspectroscopy with a Dilor OMARS instrument equipped with a 1024 photodiode multichannel detector and a ion-argon laser Spectra-Physics emitting at 514.5 nm.The spatial resolution of this technique, less than 1 μm2, allows the recording of Raman spectra at several spots in function of thickness, from the substrate to the outer deposit, including areas around the interface (Fig.l).The high anisotropy of the LO and TO Raman bands is indicative of the orientation of the epitaxial layer as well as of the structural modification in the deposit and in the substrate at the interface.With Sn doped, the epitaxial layer also presents plasmon in Raman scattering. This fact is already very well known, but we additionally observed that its frequency increases with the thickness of the deposit. For a sample with electron density 1020 cm-3, the plasmon L+ appears at 930 and 790 cm-1 near the outer surface.

10-step Synthesis of 20-nor-Salvinorin A by Dynamic Strategic Bond Analysis

2017 ◽  
Author(s):  
Jeremy Roach ◽  
Yusuke Sasano ◽  
Cullen Schmid ◽  
Saheem Zaidi ◽  
Vsevolod Katritch ◽  
...  
Keyword(s):  
Total Synthesis ◽  
Opioid Receptors ◽  
Structural Modification ◽  
High Selectivity ◽  
Therapeutic Potential ◽  
Salvinorin A ◽  
High Affinity ◽  
Plant Metabolite ◽  
Complex Architecture ◽  
Property Modification

Salvinorin A (SalA) is a plant metabolite that agonizes the human <i>kappa</i>-opioid receptor (κ-OR) with high affinity and high selectivity over <i>mu- </i>and <i>delta-</i>opioid receptors. Its therapeutic potential has stimulated extensive semi-synthetic studies and total synthesis campaigns. However, structural modification of SalA has been complicated by its instability, and efficient total synthesis has been frustrated by its dense, complex architecture. Treatment of strategic bonds in SalA as dynamic and dependent on structural perturbation enabled the identification of an efficient retrosynthetic pathway. Here we show that deletion of C20 simultaneously stabilizes the SalA skeleton, simplifies its synthesis and retains its high affinity and selectivity for the κ-OR. The resulting 10-step synthesis now opens the SalA scaffold to deep-seated property modification.

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