scholarly journals Modified magnetic nanoparticles by PEG-400-immobilized Ag nanoparticles (Fe3O4@PEG–Ag) as a core/shell nanocomposite and evaluation of its antimicrobial activity

2018 ◽  
Vol Volume 13 ◽  
pp. 3965-3973 ◽  
Author(s):  
Kamiar Zomorodian ◽  
Hamed Veisi ◽  
Mahmoud Mousavi ◽  
Mahmoud Ataabadi ◽  
Somayeh Yazdanpanah ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Magnetic Nanoparticles ◽  
Ag Nanoparticles ◽  
Core Shell ◽  
Peg 400 ◽  
Modified Magnetic Nanoparticles

Self-Assembly and Graft Polymerization Route to Monodispersed Fe3O4@SiO2—Polyaniline Core–Shell Composite Nanoparticles: Physical Properties

2008 ◽  
Vol 8 (11) ◽  
pp. 5632-5639 ◽  
Author(s):  
Kakarla Raghava Reddy ◽  
Kwang-Pill Lee ◽  
Ju Young Kim ◽  
Youngil Lee
Keyword(s):  
Magnetic Nanoparticles ◽  
Self Assembly ◽  
Magnetic Particles ◽  
Graft Polymerization ◽  
Photoelectron Spectra ◽  
Core Shell ◽  
X Ray ◽  
Pl Spectra ◽  
The Core ◽  
Modified Magnetic Nanoparticles

This study describes the synthesis of monodispersed core–shell composites of silica-modified magnetic nanoparticles and conducting polyaniline by self-assembly and graft polymerization. Magnetic ferrite nanoparticles (Fe3O4) were prepared by coprecipitation of Fe+2 and Fe+3 ions in alkaline solution, and then silananized. The silanation of magnetic particles (Fe3O4@SiO2) was carried out using 3-bromopropyltrichlorosilane (BPTS) as the coupling agent. FT-IR spectra indicated the presence of Fe—O—Si chemical bonds in Fe3O4@SiO2. Core–shell type nanocomposites (Fe3O4@SiO2/PANI) were prepared by grafting polyaniline (PANI) on the surface of silanized magnetic particles through surface initiated in-situ chemical oxidative graft polymerization. The nanocomposites were characterized by high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), Fourier transform infrared (FTIR) spectra, UV-visible spectroscopy, photoluminescence (PL) spectra, electrical conductivity and magnetic characteristics. HRTEM images of the nanocomposites revealed that the silica-modified magnetic particles made up the core while PANI made up the shell. The XPS spectrum revealed the presence of silica in the composites, and the XRD results showed that the composites were more crystalline than pure PANI. PL spectra show that composites exhibit photoluminescent property. Conductivity of the composites (6.2 to 9.4 × 10−2 S/cm) was higher than that of pristine PANI (3.7 × 10−3 S/cm). The nanocomposites exhibited superparamagnetism. Formation mechanism of the core–shell structured nanocomposites and the effect of modified magnetic nanoparticles on the electro-magnetic properties of the Fe3O4@SiO2/PANI nanocomposites are also investigated. This method provides a new strategy for the generation of multi-functional nanocomposites that composed of other conducting polymers and metal nanoparticles.

Production of Ag nanoparticles Using Aloe vera Extract and its Antimicrobial Activity

2014 ◽  
Vol 17 (2) ◽  
pp. 165-171 ◽  
Author(s):  
Sarah Ibrahim hashoosh ◽  
Ayad.M.A. Fadhil ◽  
Nabeel.k. Al-Ani
Keyword(s):  
Antimicrobial Activity ◽  
Ag Nanoparticles ◽  
Aloe Vera

scholarly journals Investigating spin coupling across a three-dimensional interface in core/shell magnetic nanoparticles

2020 ◽  
Vol 4 (3) ◽  
Author(s):  
C. Kons ◽  
Manh-Huong Phan ◽  
Hariharan Srikanth ◽  
D. A. Arena ◽  
Zohreh Nemati ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Three Dimensional ◽  
Spin Coupling ◽  
Core Shell

scholarly journals Magneto-Optical Characteristics of Streptavidin-Coated Fe3O4@Au Core-Shell Nanoparticles for Potential Applications on Biomedical Assays

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Chin-Wei Lin ◽  
Jian-Ming Chen ◽  
You-Jun Lin ◽  
Ling-Wei Chao ◽  
Sin-Yi Wei ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Faraday Effect ◽  
Au Nanoparticles ◽  
Optical Characteristics ◽  
Enzyme Linked Immunosorbent Assay ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Time Resolved ◽  
Biotechnology Research ◽  
Core Shell Nanoparticles

Abstract Recently, gold-coated magnetic nanoparticles have drawn the interest of researchers due to their unique magneto-plasmonic characteristics. Previous research has found that the magneto-optical Faraday effect of gold-coated magnetic nanoparticles can be effectively enhanced because of the surface plasmon resonance of the gold shell. Furthermore, gold-coated magnetic nanoparticles are ideal for biomedical applications because of their high stability and biocompatibility. In this work, we synthesized Fe3O4@Au core-shell nanoparticles and coated streptavidin (STA) on the surface. Streptavidin is a protein which can selectively bind to biotin with a strong affinity. STA is widely used in biotechnology research including enzyme-linked immunosorbent assay (ELISA), time-resolved immunofluorescence (TRFIA), biosensors, and targeted pharmaceuticals. The Faraday magneto-optical characteristics of the biofunctionalized Fe3O4@Au nanoparticles were measured and studied. We showed that the streptavidin-coated Fe3O4@Au nanoparticles still possessed the enhanced magneto-optical Faraday effect. As a result, the possibility of using biofunctionalized Fe3O4@Au nanoparticles for magneto-optical biomedical assays should be explored.

Core-shell Au@Ag nanoparticles on carboxylated graphene for simultaneous electrochemical sensing of iodide and nitrite

2021 ◽  
pp. 130319
Author(s):  
Zhuan-li Bao ◽  
Hui Zhong ◽  
Xiao-rong Li ◽  
An-ran Zhang ◽  
Yi-xin Liu ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Electrochemical Sensing ◽  
Core Shell
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