scholarly journals Controllable Kerr and Raman-Kerr frequency combs in functionalized microsphere resonators

Nanophotonics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 2321-2329 ◽  
Author(s):  
Song Zhu ◽  
Lei Shi ◽  
Linhao Ren ◽  
Yanjing Zhao ◽  
Bo Jiang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Tuning Range ◽  
Frequency Comb ◽  
Oxide Nanoparticles ◽  
Optical Frequency ◽  
Frequency Combs ◽  
Wavelength Division ◽  
Potential Applications ◽  
Control Light

AbstractOptical frequency comb (OFC) based on the whispering-gallery-mode microresonator has various potential applications in fundamental and applied areas. Once the solid microresonator is fabricated, its structure parameters are generally unchanged. Therefore, realizing the tunability of the microresonator OFC is an important precondition for many applications. In this work, we proposed and demonstrated the tunable Kerr and Raman-Kerr frequency combs using the ultrahigh-quality-factor (Q) functionalized silica microsphere resonators, which are coated with iron oxide nanoparticles on their end surfaces. The functionalized microsphere resonator possesses Q factors over 108 and large all-optical tunability due to the excellent photothermal performance of the iron oxide nanoparticles. We realized a Kerr frequency comb with an ultralow threshold of 0.42 mW and a comb line tuning range of 0.8 nm by feeding the control light into the hybrid microsphere resonator through its fiber stem. Furthermore, in order to broaden the comb span, we realized a Raman-Kerr frequency comb with a span of about 164 nm. Meanwhile, we also obtained a comb line tuning range of 2.67 nm for the Raman-Kerr frequency comb. This work could find potential applications in wavelength-division multiplexed coherent communications and optical frequency synthesis.

Magnetic iron oxide nanoparticles encapsulating horseradish peroxidase (HRP): synthesis, characterization and carrier for the generation of free radicals for potential applications in cancer therapy

RSC Advances ◽  
2016 ◽  
Vol 6 (112) ◽  
pp. 111099-111108 ◽  
Author(s):  
Nikesh Gupta ◽  
Chetna Gupta ◽  
Sandeep Sharma ◽  
Brijesh Rathi ◽  
Rakesh Kumar Sharma ◽  
...  
Keyword(s):  
Free Radicals ◽  
Iron Oxide ◽  
Horseradish Peroxidase ◽  
Iron Oxide Nanoparticles ◽  
Average Diameter ◽  
Oxide Nanoparticles ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Cancerous Cell ◽  
Potential Applications ◽  
20 Nm

We report synthesis of iron oxide nanoparticles encapsulating HRP. The average diameter of the particles was around 20 nm. HRP has been used to convert IAA to a toxic oxidized product and its toxic effect has been seen on cancerous cell lines.

scholarly journals Labeling mesenchymal cells with DMSA-coated gold and iron oxide nanoparticles: assessment of biocompatibility and potential applications

2016 ◽  
Vol 14 (1) ◽  
Author(s):  
Luisa H. A. Silva ◽  
Jaqueline R. da Silva ◽  
Guilherme A. Ferreira ◽  
Renata C. Silva ◽  
Emilia C. D. Lima ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Mesenchymal Cells ◽  
Oxide Nanoparticles ◽  
Potential Applications

scholarly journals Multifunctional Silver Nanoparticles: Synthesis and Applications

2021 ◽  
Author(s):  
Nguyen Hoang Nam
Keyword(s):  
Silver Nanoparticles ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Silica Matrix ◽  
Oxide Nanoparticles ◽  
Core Shell ◽  
The Core ◽  
Methods Of Synthesis ◽  
Potential Applications

Multifunctional silver nanoparticles have attracted widely due to their potential applications. Based on the properties of individual silver nanoparticles, such as plasmonic and antibacterial properties, silver nanoparticles can become multifunctional by surface modifications with various surfactants or they can be combined in core-shell and composite structures with the magnetic nanoparticles to form bifunctional nanoparticles. After reviewing the methods of synthesis and applications of silver nanoparticles, the chapter describes the synthesis and the properties of the new types of multifunctional silver nanomaterials based on the plasmonic behaviors of silver nanoparticles and the iron oxide Fe3O4 superparamagnetic nanoparticles. One type is a simple combination of silver nanoparticles and iron oxide nanoparticles in a silica matrix Fe3O4/Ag-4ATP@SiO2. Other types are the core-shell structured nanoparticles, where Fe3O4 nanoparticles play as the core and silver nanoparticles are the outer shell, so-called Fe3O4@SiO2-Ag and Fe3O4-Ag. In the Fe3O4@SiO2-Ag, silver nanoparticles are reduced on the surface of silica-coated magnetic core, while in Fe3O4-Ag, silver nanoparticles are directly reduced on the amino groups functionalized on the surface of magnetic nanoparticles without coating with silica. Both of types of the multifunctional silver nanoparticles show the plasmonic and magnetic properties similar as the individual silver and iron oxide nanoparticles. Finally, some applications of those multifunctional silver nanoparticles will be discussed.

scholarly journals Iron Oxide Nanoparticles in Bioimaging – An Immune Perspective

2021 ◽  
Vol 12 ◽  
Author(s):  
Mark Geppert ◽  
Martin Himly
Keyword(s):  
Immune System ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Biological Effects ◽  
Tumor Therapy ◽  
Short Review ◽  
Oxide Nanoparticles ◽  
Human Immune System ◽  
Potential Applications ◽  
Immunological Effects

Iron oxide nanoparticles (IONPs) bear big hopes in nanomedicine due to their (potential) applications in tumor therapy, drug delivery or bioimaging. However, as foreign entities, such particles may be recognized by the immune system and, thus, lead to inflammation, hypersensitivity or anaphylactic shock. In addition, an overload with iron is known to cause oxidative stress. In this short review, we summarize the biological effects of such particles with a major focus on IONP-formulations used for bioimaging purposes and their effects on the human immune system. We conclude that especially the characteristics of the particles (size, shape, surface charge, coating, etc.) as well as the presence of bystander substances, such as bacterial endotoxin are important factors determining the resulting biological and immunological effects of IONPs. Further studies are needed in order to establish clear structure-activity relationships.

Iron Oxide Nanoparticles (IONPs) with potential applications in plasmid DNA isolation

2018 ◽  
Vol 545 ◽  
pp. 167-178 ◽  
Author(s):  
J.R Sosa-Acosta ◽  
J.A. Silva ◽  
L. Fernández-Izquierdo ◽  
S. Díaz-Castañón ◽  
M. Ortiz ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Plasmid Dna ◽  
Dna Isolation ◽  
Oxide Nanoparticles ◽  
Potential Applications

scholarly journals Ecofriendly Green Synthesis of Iron Oxide Nanoparticles Using citrus sinensis

2020 ◽  
Vol 1 (1) ◽  
pp. 22-30
Author(s):  
Tanzila Sahar ◽  
Huma Munir ◽  
Zahida Zia ◽  
Nageen ◽  
Naila Rafiq ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Green Synthesis ◽  
Iron Oxide Nanoparticles ◽  
Citrus Sinensis ◽  
Cost Effective ◽  
Potential Method ◽  
Oxide Nanoparticles ◽  
Synthesis Of Nanoparticles ◽  
Cost Effective Approach ◽  
Potential Applications

Green protocols being eco-friendly and cost effective approach are most widely used for the production of iron oxide nanoparticles using plant-mediated extract of Citrus Sinensis, moreoverbiosynthesized iron oxide (FeO) nanoparticles shows better antibacterial activity.Green synthesis of nanoparticles has been broadly studied from the past few years because of their different features and potential applications in various fields. The successful biosynthesis of iron oxide nanoparticles was confirmed and characterized using UV-Visible spectroscopy, Scanning Electron Microscope (SEM), Fourier Transform Infrared (FTIR) analysis and Zeta sizer. Antibacterial effect of biologically produced iron oxide nanoparticles was tested against Gram-negative bacteria (Escherichia coli) and Gram-positive bacteria (Macrococus). These results exhibited that iron oxide nanoparticles have high antibacterial potential as these nanoparticles showed significant zone of inhibition against bacteria strains. The proposed green synthesis of iron oxide nanoparticles (NPs) from Citrus Sinensis can be strongly recommended as a potential method for industrial application.

scholarly journals Magnetic Properties of Collagen–Chitosan Hybrid Materials with Immobilized Superparamagnetic Iron Oxide Nanoparticles (SPIONs)

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7652
Author(s):  
Sylwia Fiejdasz ◽  
Adriana Gilarska ◽  
Tomasz Strączek ◽  
Maria Nowakowska ◽  
Czesław Kapusta
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Hybrid Materials ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Collagen Hydrogel ◽  
Hydrogel Matrix ◽  
Potential Applications

The paper presents results of our studies on hybrid materials based on polymers of natural origin containing superparamagnetic iron oxide nanoparticles (SPIONs). Such nanoparticles, coated with the chitosan derivative, were immobilized in a chitosan-collagen hydrogel matrix by crosslinking with genipin. Three types of biopolymer matrices of different collagen-to-chitosan ratios were studied. A thorough magnetic characterization was performed, including magnetic susceptibility, magnetization, and hysteresis loop measurements in a temperature range of 4 K to 300 K and a magnetic field induction up to 8 Tesla. The effect of SPION immobilization and material composition on the magnetic properties of the hybrids was investigated. The results showed that hybrid materials with covalently bounded SPIONs preserved the superparamagnetic character of SPIONs and exhibited promising magnetic properties, which are important for their potential applications.

TARGETING CYCLIN B1 WITH ANTISENSE OLIGONUCLETOTIDES- COATED SUPERPARAMAGNETIC IRON OXIDE NANOPARTICLES

2018 ◽  
Vol 6 (10) ◽  
Author(s):  
Hosam Zaghloul ◽  
Doaa A. Shahin ◽  
Ibrahim El- Dosoky ◽  
Mahmoud E. El-awady ◽  
Fardous F. El-Senduny ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Cellular Uptake ◽  
Superparamagnetic Iron Oxide ◽  
Cyclin B1 ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Mcf7 Cells ◽  
M Phase ◽  
The Impact

Antisense oligonucleotides (ASO) represent an attractive trend as specific targeting molecules but sustain poor cellular uptake meanwhile superparamagnetic iron oxide nanoparticles (SPIONs) offer stability of ASO and improved cellular uptake. In the present work we aimed to functionalize SPIONs with ASO targeting the mRNA of Cyclin B1 which represents a potential cancer target and to explore its anticancer activity. For that purpose, four different SPIONs-ASO conjugates, S-M (1–4), were designated depending on the sequence of ASO and constructed by crosslinking carboxylated SPIONs to amino labeled ASO. The impact of S-M (1–4) on the level of Cyclin B1, cell cycle, ROS and viability of the cells were assessed by flowcytometry. The results showed that S-M3 and S-M4 reduced the level of Cyclin B1 by 35 and 36%, respectively. As a consequence to downregulation of Cyclin B1, MCF7 cells were shown to be arrested at G2/M phase (60.7%). S-M (1–4) led to the induction of ROS formation in comparison to the untreated control cells. Furthermore, S-M (1–4) resulted in an increase in dead cells compared to the untreated cells and SPIONs-treated cells. In conclusion, targeting Cyclin B1 with ASO-coated SPIONs may represent a specific biocompatible anticancer strategy.

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