Core-decomposition-facilitated fabrication of hollow rare-earth silicate nanowalnuts from core–shell structures via the Kirkendall effect

Nanoscale ◽  
2015 ◽  
Vol 7 (32) ◽  
pp. 13715-13722 ◽  
Author(s):  
Wenli Zhou ◽  
Rui Zou ◽  
Xianfeng Yang ◽  
Ningyu Huang ◽  
Junjian Huang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Kirkendall Effect ◽  
Shell Structures ◽  
Core Shell ◽  
Interfacial Diffusion ◽  
Initial Nucleation

The decomposition of YOHCO3 core facilitates the initial nucleation of Kirkendall nanovoids and accelerates the interfacial diffusion of Y2O3@SiO2 core@shell.

Modified TiO2Structures with Enhanced Photoluminescence and Photocatalytic Activity

2021 ◽  
Vol 13 (2) ◽  
pp. 331-341
Author(s):  
Jinqi Wang ◽  
Guopeng Li ◽  
Wei Wang ◽  
Fuxia Li ◽  
Chuankai Yang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Rare Earth ◽  
Photocatalytic Degradation ◽  
Environmental Remediation ◽  
Rare Earth Ions ◽  
Shell Structures ◽  
Rare Earth Complex ◽  
Core Shell ◽  
Rare Earth Ion ◽  
The Rare Earth

Photocatalytic degradation of pollutants has attracted much attention because it can effectively solve the problem of environmental pollution. SiO2@Eu(TTA)3phen@TiO2 core-shell structures were successfully synthesized for the first time by a solvothermal method involving ultrasound assistance which can optimize the rare earth complex dispersibility and achieve strong emission intensity. SiO2@Eu3+@TiO2 core-shell structures were also successfully synthesized by a similar method. Photocatalytic activity analysis showed that the photocatalytic activity factor not only depended on the rare earth ion content, but also related to the structure and size of the TiO2 nanoparticles. Photocatalytic activity increased first and then decreased with the quantity of rare earth ions. Photocatalytic activity was also superior for hollow structures compared to solid structure. Photocatalytic activity of SiO2@TiO2 particles increased with the particle size, until the size increased to 450 nm. Rare earth ions content as well as particle structures and sizes affected efficiency for the photocatalytic degradation of methyl orange. Outstanding photocatalytic activity provides the composite particles with improved potential to purify aquatic contaminants and to meet the demands of future environmental remediation applications.

scholarly journals Optimized Microstructure and Improved Magnetic Properties of Pr-Dy-Al-Ga Diffused Sintered Nd-Fe-B Magnets

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2583
Author(s):  
Pengpeng Qu ◽  
Feifei Li ◽  
Sajjad Ur Rehman ◽  
Lei He ◽  
Xiaoqiang Yu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Grain Boundary ◽  
Diffusion Process ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
Shell Structures ◽  
Core Shell ◽  
Thermal Stability Of

The grain boundary diffusion process (GBDP) has become an important technique in improving the coercivity and thermal stability of Dy-free sintered Nd-Fe-B magnets. The influence of Dy70Al10Ga20 and (Pr75Dy25)70Al10Ga20 alloys by the GBDP on sintered Nd-Fe-B magnets are investigated in this paper. After diffusing Dy70Al10Ga20 and (Pr75Dy25)70Al10Ga20 alloys, the coercivity (Hcj) of the magnets increased from 13.58 kOe to 20.10 kOe and 18.11 kOe, respectively. Meanwhile, the remanence of the magnets decreased slightly. The thermal stability of the diffused magnets was improved by the GBDP. The microstructure shows continuous Rare-earth-rich (RE-rich) grain boundary phases and (Dy, Pr/Nd)2Fe14B core-shell structures which contribute to improving the coercivity. Moreover, the Dy concentration on the surface of the (Pr75Dy25)70Al10Ga20 diffused magnets decreased with the Pr substitution for the Dy element. The openness of the recoil loops for the (Pr75Dy25)70Al10Ga20 diffused magnets is smaller than that of the original magnets and Dy70Al10Ga20 diffused magnets. The results show that the (Pr75Dy25)70Al10Ga20 alloys can effectively optimize the microstructure and improve the magnetic properties and thermal stability of the sintered Nd-Fe-B magnets.

Designing active mats based on cellulose acetate/polycaprolactone core/shell structures with different release kinetics

2021 ◽  
Vol 261 ◽  
pp. 117849 ◽  
Author(s):  
Adrián Rojas ◽  
Eliezer Velásquez ◽  
Constanza Piña ◽  
María José Galotto ◽  
Carol López de Dicastillo
Keyword(s):  
Cellulose Acetate ◽  
Release Kinetics ◽  
Shell Structures ◽  
Core Shell

scholarly journals A SERS Study of Charge Transfer Process in Au Nanorod–MBA@Cu2O Assemblies: Effect of Length to Diameter Ratio of Au Nanorods

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 867
Author(s):  
Lin Guo ◽  
Zhu Mao ◽  
Sila Jin ◽  
Lin Zhu ◽  
Junqi Zhao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Shell Structure ◽  
Shell Structures ◽  
Core Shell ◽  
Absorption Bands ◽  
Au Nanorods ◽  
The Core ◽  
Band Position ◽  
Surface Enhanced Raman ◽  
Core Shell Structure

Surface-enhanced Raman scattering (SERS) is a powerful tool in charge transfer (CT) process research. By analyzing the relative intensity of the characteristic bands in the bridging molecules, one can obtain detailed information about the CT between two materials. Herein, we synthesized a series of Au nanorods (NRs) with different length-to-diameter ratios (L/Ds) and used these Au NRs to prepare a series of core–shell structures with the same Cu2O thicknesses to form Au NR–4-mercaptobenzoic acid (MBA)@Cu2O core–shell structures. Surface plasmon resonance (SPR) absorption bands were adjusted by tuning the L/Ds of Au NR cores in these assemblies. SERS spectra of the core-shell structure were obtained under 633 and 785 nm laser excitations, and on the basis of the differences in the relative band strengths of these SERS spectra detected with the as-synthesized assemblies, we calculated the CT degree of the core–shell structure. We explored whether the Cu2O conduction band and valence band position and the SPR absorption band position together affect the CT process in the core–shell structure. In this work, we found that the specific surface area of the Au NRs could influence the CT process in Au NR–MBA@Cu2O core–shell structures, which has rarely been discussed before.

Template-free synthesis of ordered ZnO@ZnS core–shell arrays for high performance supercapacitors

2016 ◽  
Vol 45 (44) ◽  
pp. 17980-17986 ◽  
Author(s):  
Hailong Yan ◽  
Tong Li ◽  
Yang Lu ◽  
Jinbing Cheng ◽  
Tao Peng ◽  
...  
Keyword(s):  
High Performance ◽  
Shell Structures ◽  
Core Shell ◽  
Template Free

In this article, ordered ZnO@ZnS core–shell structures have been produced on a stainless mesh by a two-step approach without using a template.

Synthesis and characterisation of core–shell structures for orthopaedic surgery

2007 ◽  
Vol 40 (15) ◽  
pp. 3349-3353 ◽  
Author(s):  
Edina Rusen ◽  
Cătălin Zaharia ◽  
Teodora Zecheru ◽  
Bogdan Mărculescu ◽  
Robert Filmon ◽  
...  
Keyword(s):  
Orthopaedic Surgery ◽  
Shell Structures ◽  
Core Shell

In situ electropolymerised silica–polyaniline core–shell structures: Electrode modification and enzyme biosensor enhancement

2007 ◽  
Vol 52 (5) ◽  
pp. 1865-1870 ◽  
Author(s):  
Xiliang Luo ◽  
Anthony J. Killard ◽  
Aoife Morrin ◽  
Malcolm R. Smyth
Keyword(s):  
Shell Structures ◽  
Core Shell ◽  
Electrode Modification ◽  
Enzyme Biosensor

Coordination polymer core/shell structures: Preparation and up/down-conversion luminescence

2016 ◽  
Vol 479 ◽  
pp. 15-19 ◽  
Author(s):  
Bingmei Li ◽  
Hualan Xu ◽  
Chen Xiao ◽  
Min Shuai ◽  
Weimin Chen ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Shell Structures ◽  
Core Shell ◽  
Down Conversion
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