scholarly journals Structural Regulation of Magnetic Polymer Microsphere@Ionic Liquids with an Intermediate Protective Layer and Application as Core–Shell–Shell Catalysts with High Stability and Activity

ACS Omega ◽  
2020 ◽  
Vol 5 (36) ◽  
pp. 23062-23069
Author(s):  
Jing Chen ◽  
Yujing Ren ◽  
Hansheng Li ◽  
Wang Yang ◽  
Qin Wu ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
High Stability ◽  
Protective Layer ◽  
Core Shell ◽  
Polymer Microsphere ◽  
Structural Regulation

Coating thickness determination in highly absorbent core–shell systems

2012 ◽  
Vol 45 (5) ◽  
pp. 906-913 ◽  
Author(s):  
Herve Palancher ◽  
Anne Bonnin ◽  
Veijo Honkimäki ◽  
Heikki Suhonen ◽  
Peter Cloetens ◽  
...  
Keyword(s):  
Coating Thickness ◽  
Protective Layer ◽  
Test Sample ◽  
High Energy ◽  
Core Shell ◽  
Single Shot ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alloy Particles ◽  
Potential Applications

This article describes a single-shot methodology to derive an average coating thickness in multi-particle core–shell systems exhibiting high X-ray absorption. Powder composed of U–Mo alloy particles surrounded by a micrometre-thick UO2protective layer has been used as a test sample. Combining high-energy X-ray diffraction and laser granulometry, the average shell thickness could be accurately characterized. These results have been validated by additional measurements on single particles by two techniques: X-ray nanotomography and high-energy X-ray diffraction. The presented single-shot approach gives rise to many potential applications on core–shell systems and in particular on as-fabricated heterogeneous nuclear fuels.

Tetracarboxyl-Functionalized Ionic Liquid: Synthesis and Catalytic Properties

2015 ◽  
Vol 68 (10) ◽  
pp. 1513 ◽  
Author(s):  
Miaona Feng ◽  
Guoying Zhao ◽  
Hongling Gao ◽  
Suojiang Zhang
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Ionic Liquids ◽  
Propionic Acid ◽  
Propylene Carbonate ◽  
Propylene Oxide ◽  
High Stability ◽  
Ammonium Acetate ◽  
Catalytic Properties ◽  
Potential Applications

Novel tetracarboxyl-functionalized 2,2′-biimidazolium-based ionic liquids (ILs) with different anions were synthesized in two steps from readily available and sustainable starting materials including ammonium acetate, glyoxal, and halogenated propionic acid. The functionalized IL exhibited higher catalytic activity towards the cycloaddition of CO2 to terminal epoxides. With propylene oxide as a substrate, the optimum yield of propylene carbonate reached 82.7 % at an initial CO2 pressure of 2.0 MPa for 4 h at 140°C. Moreover, the functionalized IL catalyst displayed a high stability and can be reused for at least five cycles without obvious loss of catalytic activity. The results provide a simple and economical way to synthesize multi-functionalized imidazolium-based ILs with versatile potential applications.

Controllable Preparation of Silver Orthophosphate@Carbon Layer Core/Shell Heterostructure with Enhanced Visible Photocatalytic Properties and Stability

NANO ◽  
2015 ◽  
Vol 10 (02) ◽  
pp. 1550022 ◽  
Author(s):  
Yangcun Xie ◽  
Xiuwen Wang ◽  
Xu Wen
Keyword(s):  
High Stability ◽  
Separation Efficiency ◽  
Visible Region ◽  
Carbon Layer ◽  
Core Shell ◽  
Photogenerated Electrons ◽  
First Time ◽  
Fabrication Parameters ◽  
Controllable Preparation ◽  
High Separation

In this study, silver orthophosphate@carbon layer ( Ag 3 PO 4@ C ) core/shell heterostructure photocatalyst was prepared for the first time. The results showed that a uniform carbon layer was formed around the Ag 3 PO 4. By adjusting the hydrothermal fabrication parameters, the thickness of carbon layer could be easily controlled. Furthermore, the Ag 3 PO 4@ C had remarkable light absorption in the visible region. Photocatalytic tests displayed that the Ag 3 PO 4@ C heterostructures possessed a much higher degradation rate of phenol than pure Ag 3 PO 4 under visible light. The enhanced photocatalytic activity could be attributed to high separation efficiency of photogenerated electrons and holes based on the synergistic effect between carbon as a sensitizer and Ag 3 PO 4. Recycle tests showed that the Ag 3 PO 4@ C core/shell heterostructures maintained high stability over several cycles. The good stability could be attributed to the protection of insoluble carbon layer on the surfaces of Ag 3 PO 4 crystals in aqueous solution.

Ultra-high stability and magnetic response of magnetorheological fluids based on magnetic ionic liquids and carbonyl iron fibers

2021 ◽  
Vol 65 (6) ◽  
pp. 1347-1359
Author(s):  
Xiaolin Li ◽  
Ruihua Guan ◽  
KangTai Ou ◽  
Qiang Fu ◽  
Guiyan Yang ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Carbonyl Iron ◽  
High Stability ◽  
Magnetorheological Fluids ◽  
Magnetic Response ◽  
Magnetic Ionic Liquids

scholarly journals Enhanced UV Light Emission by Core-Shell Upconverting Particles Powering up TiO2 Photocatalysis in Near-Infrared Light

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 232
Author(s):  
Agnieszka Jarosz-Duda ◽  
Paulina O’Callaghan ◽  
Joanna Kuncewicz ◽  
Przemysław Łabuz ◽  
Wojciech Macyk
Keyword(s):  
Near Infrared ◽  
Light Emission ◽  
Uv Light ◽  
Protective Layer ◽  
Upconversion Emission ◽  
High Photocatalytic Activity ◽  
Infrared Light ◽  
Core Shell ◽  
The Core ◽  
Surface Luminescence

The core-shell NaYb0.99F4:Tm0.01@NaYF4 upconverting particles (UCPs) with a high UV emission to apply in NIR-driven photocatalysis were synthesized. The influence of the Yb3+ doping concentration in NaYxF4:Yb0.99−xTm0.01 core particles, and the role of the NaYF4 shell on the upconversion emission intensity of the UCPs were studied. The absorption of NIR light by the obtained UCPs was maximized by increasing the Yb3+ concentration in the core, reaching the maximum for Y3+-free particles (NaYb0.99F4:Tm0.01). Additionally, covering the NaYb0.99F4:Tm0.01 core with a protective layer of NaYF4 minimized the surface luminescence quenching, which significantly improved the efficiency of upconversion emission. The high intensity of the UV light emitted by the NaYb0.99F4:Tm0.01@NaYF4 under NIR irradiation resulted in a high photocatalytic activity of TiO2 (P25) mixed with the synthesized material.

High-Stability Ionic Liquids. A New Class of Stationary Phases for Gas Chromatography

2003 ◽  
Vol 75 (18) ◽  
pp. 4851-4858 ◽  
Author(s):  
Jared L. Anderson ◽  
Daniel W. Armstrong
Keyword(s):  
Gas Chromatography ◽  
Ionic Liquids ◽  
High Stability ◽  
Stationary Phases ◽  
New Class

Effect of Cores on Photoluminescence of Hybrid SiO2-Coated CdTe Quantum Dots

2020 ◽  
Vol 20 (9) ◽  
pp. 5478-5485
Author(s):  
Cong Xie ◽  
Yubin Zhao ◽  
Yuxiang Song ◽  
Yingjie Liu ◽  
Yaya Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Stability ◽  
Sol Gel ◽  
Quantum Yields ◽  
Core Shell ◽  
Aqueous Synthesis ◽  
Pl Spectra ◽  
Cdte Qds ◽  
Sol Gel Process ◽  
20 Nm

Compared with conventional semiconductor quantum dots, hybrid SiO2 coated CdTe QDs exhibited high stability, long fluorescent lifetime, high photoluminescence quantum yields, and well biocompatibility. In this paper, CdTe QDs with tunable PL from green to red emitting were prepared by an aqueous synthesis. A sol–gel process resulted in CdTe QDs coated with a hybrid SiO2 shell contained CdS-like clusters to obtain red-shifted PL spectra, increased PL efficiency and high stability. The clusters were formed by the reaction of Cd2+ and S2− ions generated via the decomposition of thioglycolic acid. The clusters around CdTe cores created a core–shell structure which is very similar with traditional semiconductor core–shell QDs. After being coated with a hybrid SiO2 shell, the PL of green-emitting naked CdTe QDs was red-shifted largely (~30 nm) while the PL of yellowemitting CdTe QDs revealed a small red-shifted (~20 nm). Furthermore, The PL of red-emitting naked CdTe QDs was red-shifted much small (less than 10 nm). This phenomenon is ascribed to the change of band gap of CdTe cores with sizes. The red-shift of PL spectra is attributed to the CdS-like clusters around the core rather than the thickness of the hybrid SiO2 shell.

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