scholarly journals A Fluorescent Sensor for Zinc Detection and Removal Based on Core-Shell Functionalized Fe3O4@SiO2Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Yaohui Xu ◽  
Yang Zhou ◽  
Wenhui Ma ◽  
Shixing Wang
Keyword(s):  
Aqueous Solution ◽  
Color Change ◽  
Fluorescent Sensor ◽  
Shell Structures ◽  
Acetonitrile Solution ◽  
Core Shell ◽  
The Core ◽  
Visual Color ◽  
Efficient Route ◽  
Zinc Detection

The magnetic Fe3O4@SiO2nanoparticles (NPs) functionalized with 8-chloroacetylaminoquinoline as a fluorescent sensor for detection and removal of Zn2+have been synthesized. The core-shell structures of the nanoparticles and chemical composition have been confirmed by TEM, XRD, FTIR, and XPS techniques. The addition of functionalized Fe3O4@SiO2NPs into the acetonitrile solution of Zn2+had an effect of visual color change as well as significant fluorescent enhancement. High-saturated magnetizations (24.7 emu/g) of functionalized Fe3O4@SiO2NPs could help to separate the metal ions from the aqueous solution. The magnetic sensor exhibited high removal efficiency towards Zn2+(92.37%). In this work, we provided an easy and efficient route to detect Zn2+and simultaneously remove Zn2+.

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.

Insight into the core–shell structures of Cu–In–S microspheres

2013 ◽  
Vol 26 ◽  
pp. 23-30 ◽  
Author(s):  
Angela S. Wochnik ◽  
Anna Frank ◽  
Christoph Heinzl ◽  
Jonas Häusler ◽  
Julian Schneider ◽  
...  
Keyword(s):  
Shell Structures ◽  
Core Shell ◽  
The Core ◽  
Insight Into

Formation of bismuth iron oxide based core–shell structures and their dielectric, ferroelectric and magnetic properties

2019 ◽  
Vol 7 (5) ◽  
pp. 1280-1291 ◽  
Author(s):  
Alaka Panda ◽  
R. Govindaraj ◽  
R. Mythili ◽  
G. Amarendra
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Magnetic Properties ◽  
Iron Oxide ◽  
Shell Structures ◽  
Core Shell ◽  
Bismuth Iron Oxide ◽  
The Core ◽  
Shell Nanostructures ◽  
Transmission Electron

Bismuth and iron oxides subjected to ball milling followed by controlled annealing treatments showed the formation of core–shell nanostructures with Bi2Fe4O9 as the core and a shell of BiFeO3 and Bi25FeO40 phases as deduced based on the analysis of transmission electron microscopy results.

CORE-SHELL Zn/ZnO STRUCTURES WITH IMPROVED PHOTOCATALYTIC PROPERTIES SYNTHESIZED BY AQUEOUS SOLUTION METHOD

2013 ◽  
Vol 06 (06) ◽  
pp. 1350058 ◽  
Author(s):  
YUAN MING HUANG ◽  
QING-LAN MA ◽  
BAO-GAI ZHAI
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Solution Method ◽  
Core Shell ◽  
Green Method ◽  
X Ray ◽  
The Core ◽  
Semiconductor Junction ◽  
Aqueous Solution Method ◽  
Scanning Electron

A facile and green method was utilized to synthesize core-shelled Zn / ZnO microspheres by boiling Zn microparticles in water for improving the photocatalytic activity of ZnO . The synthesized Zn / ZnO core-shells were investigated by means of scanning electron microscope, X-ray diffractometer and photoluminescence spectrometer, respectively. The morphology analysis showed that the metallic Zn core was about 6 μm in diameter while the ZnO shell was about 600 nm in thickness. Compared to ZnO nanoparticles, the core-shelled Zn / ZnO microspheres exhibited improved photocatalytic activity in degrading methyl orange in water. Our results suggest that the metal–semiconductor junction formed at the Zn / ZnO interface is responsible for the enhanced photocatalytic activity of ZnO .

scholarly journals Magnetic Nanoparticles: Co@SiO2, Co@Au and Co@Pt

2017 ◽  
Vol 36 (4) ◽  
pp. 01 ◽  
Author(s):  
Vagner Sargentelli ◽  
Antônio A. P. Ferreira
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Shell Structures ◽  
Human Organism ◽  
Core Shell ◽  
Present Moment ◽  
Metallic Oxides ◽  
The Core ◽  
Structure Changes ◽  
And Control

Nanotechnology is the understanding and control f matter at dimensions of roughly 1 – 100 nm. At the nanoscale, the properties like electrical conductivity and mechanical strength are not the same as the materials with particles in dimensions much more than 100 nm. The electronic structure changes dramatically too. Between nanomaterials, there is recently a great number of works that investing as the synthesis as the properties of the magnetic nanoparticles. The interest in these materials is due to its magnetic applications. Some of more representative magnetic materials are the metallic oxides, as some ferrites. However, the ferrites are often obtained as mixture of some oxides, which implies that the magnetic properties are not always well defined and reproducible. Thus, the researches has been turned to use of the magnetic metals, between which the cobalt. The cobalt is investigated because its high magnetic susceptility. However, this transition metal is easily oxidate in air and is toxic to human organism. For this reason, it has looked for to effect synthesis involving core – shell structures, which no to allow the oxidation of the cobalt and prevent against its toxicity. Between the shells that come being obtained it is of silica and of gold. In addition, in if treating to catalysis in a general way, the price of the cobalt and its magnetic properties are adjusted for the attainment core – shell catalysts, Cocore@Ptshell, (Co@Pt). So, the aim of this article is to present and to do an analysis of the more representative synthetic route used until the present moment to obtain the core – shell structures: Co@SiO2, Co@Au and Co@Pt.

Model-based design and synthesis of ferrocene containing microgels

2020 ◽  
Vol 11 (2) ◽  
pp. 315-325 ◽  
Author(s):  
Sabine Schneider ◽  
Falco Jung ◽  
Olga Mergel ◽  
Janik Lammertz ◽  
Anne C. Nickel ◽  
...  
Keyword(s):  
Shell Structures ◽  
Core Shell ◽  
Design And Synthesis ◽  
The Core ◽  
Model Based ◽  
Copolymer Microgels

Modelling and synthesis go hand in hand to efficiently engineer copolymer microgels with various architectures: core–shell structures (with ferrocene mainly in the core or in the shell) and also microgels with homogeneous comonomer distribution.

A review of electrode materials based on core–shell nanostructures for electrochemical supercapacitors

2019 ◽  
Vol 7 (8) ◽  
pp. 3516-3530 ◽  
Author(s):  
Kuo-Chuan Ho ◽  
Lu-Yin Lin
Keyword(s):  
Electrode Materials ◽  
Review Article ◽  
Shell Structures ◽  
Core Shell ◽  
Electrochemical Supercapacitors ◽  
Active Materials ◽  
The Core ◽  
The Past ◽  
Shell Nanostructures ◽  
Core Shell Structure

This review article outlines the most commonly used methods for making the core/shell structures as the active materials for supercapacitors over the past decade (2007–2018), and points out the most efficient combination of the material categories and morphologies for the core/shell structure.

Enhanced upconversion luminescence through core/shell structures and its application for detecting organic dyes in opaque fishes

2016 ◽  
Vol 15 (2) ◽  
pp. 260-265 ◽  
Author(s):  
Pan Hu ◽  
Xiaofeng Wu ◽  
Shigang Hu ◽  
Zenghui Chen ◽  
Huanyuan Yan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Rhodamine B ◽  
Organic Dyes ◽  
Upconversion Luminescence ◽  
Shell Structures ◽  
Sodium Fluorescein ◽  
Core Shell

It confirms based on LRET that no Rhodamine B is absorbed by fishes after incubating in the aqueous solution of 1 μg ml−1 Rhodamine B for one day, contrary to sodium fluorescein.

Effect of elastic strain energy on the core-shell structures of the precipitates in Al-Sc-Er alloys

2012 ◽  
Vol 30 (12) ◽  
pp. 1276-1280 ◽  
Author(s):  
Sicheng CHEN ◽  
Changrong LI ◽  
Guangli LIAN ◽  
Cuiping GUO ◽  
Zhenmin DU
Keyword(s):  
Elastic Strain ◽  
Strain Energy ◽  
Elastic Strain Energy ◽  
Shell Structures ◽  
Core Shell ◽  
The Core
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