scholarly journals Proteresis of Core-Shell Nanocrystals: Investigation through Theoretical Simulation and Experimental Analysis

10.5772/62398 ◽  
2016 ◽  
Author(s):  
Jhong-Yi Ji ◽  
Sheng Yun Wu
Keyword(s):  
Experimental Analysis ◽  
Core Shell ◽  
Theoretical Simulation

scholarly journals A nested square-shape dielectric resonator for microwave band antenna applications

2021 ◽  
Vol 11 (1) ◽  
pp. 481
Author(s):  
Ubaid Ullah ◽  
Ismail Ben Mabrouk ◽  
Muath Al-Hasan ◽  
Mourad Nedil ◽  
Mohd Fadzil Ain
Keyword(s):  
Experimental Analysis ◽  
Dielectric Resonator ◽  
Close Agreement ◽  
Microstrip Line ◽  
Impedance Bandwidth ◽  
Microwave Band ◽  
Radiation Characteristics ◽  
Theoretical Simulation ◽  
The Subject ◽  
Improved Performance

In this paper, a nested square-shape dielectric resonator (NSDR) has been designed and investigated for antenna applications in the microwave band. A solid square dielectric resonator (SSDR) was modified systematically by introducing air-gap in the azimuth (ϕ-direction). By retaining the square shape of the dielectric resonator (DR), the well-known analysis tools can be applied to evaluate the performance of the NSDR. To validate the performance of the proposed NSDR in antenna applications, theoretical, simulation, and experimental analysis of the subject has been performed. A simple microstrip-line feeding source printed on the top of Rogers RO4003 grounded substrate was utilized without any external matching network. Unlike solid square DR, the proposed NSDR considerably improves the impedance bandwidth. The proposed antenna has been prototyped and experimentally validated. The antenna operates in the range of 12.34GHz to 21.7GHz which corresponds to 56% percentage bandwidth with peak realized gain 6.5dB. The antenna has stable radiation characteristics in the broadside direction. A close agreement between simulation and experimental results confirms the improved performance of NSDR in antenna applications.

Investigation of dual plasmonic core-shell Ag@CuS nanoparticles for potential surface-enhanced Raman spectroscopy-guided photothermal therapy

Nanomedicine ◽  
2021 ◽  
Author(s):  
Anindita Das ◽  
Vinothini Arunagiri ◽  
Hsieh-Chih Tsai ◽  
Adhimoorthy Prasannan ◽  
Juin-Yih Lai ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Photothermal Therapy ◽  
Heat Dissipation ◽  
Near Infrared ◽  
Surface Enhanced Raman Spectroscopy ◽  
Infrared Light ◽  
Core Shell ◽  
Theoretical Simulation ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Aim: To prepare efficient metal-semiconductor nanoparticles as noninvasive, real-time imaging probes for photothermal therapy (PTT) applications. Materials & methods: A bottom-up approach was used to fabricate core-shell Ag@CuS nanoparticles (NPs). PTT and Raman mapping were done using HeLa cells. Theoretical simulation of electric field enhancement and heat dissipation density of Ag@CuS NPs was performed. Results: PTT-induced hyperthermia was achieved under 940 nm near-infrared light irradiation. Surface-enhanced Raman spectroscopy (SERS) signals of dye molecules were observed when conjugated with Ag@CuS NPs. Conclusion: Ag@CuS NPs are found to be efficient for SERS imaging and localized heating under laser irradiation, making a promising candidate for SERS-guided PTT.

A crystalline–amorphous Ni–Ni(OH)2 core–shell catalyst for the alkaline hydrogen evolution reaction

2020 ◽  
Vol 8 (44) ◽  
pp. 23323-23329
Author(s):  
Jing Hu ◽  
Siwei Li ◽  
Yuzhi Li ◽  
Jing Wang ◽  
Yunchen Du ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Core Shell ◽  
Alkaline Conditions

Crystalline–amorphous Ni–Ni(OH)2 core–shell assembled nanosheets exhibit outstanding electrocatalytic activity and stability for hydrogen evolution under alkaline conditions.

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