scholarly journals Synthesis and Comparative Biological Properties of Ag-PEG Nanoparticles with Tunable Morphologies from Janus to Multi-Core Shell Structure

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1787 ◽  
Author(s):  
Mengda Xu ◽  
Jie Liu ◽  
Xiankui Xu ◽  
Shanhu Liu ◽  
František Peterka ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Silver Nitrate ◽  
Shell Structure ◽  
Irradiation Time ◽  
Antibacterial Activities ◽  
Biological Properties ◽  
Hybrid Nanoparticles ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Structure

Silver nanoparticles synthesized with polymers as coating agents is an effective method to overcome their poor stability and aggregation in solution. Silver-polyethylene glycol (Ag-PEG) nanoparticles were synthesized with the thiol-functionalized polyethylene glycol (SH-PEA) as the coating, reducing and stabilizing agent. The UV irradiation time, polymer and silver nitrate concentration for the synthesis were investigated. The concentration of silver nitrate had significant effect on the morphology of Ag-PEG nanoparticles. When increasing the concentration of silver nitrate, SEM and TEM images showed that Ag-PEG nanoparticles changed from Janus to multi-core shell structure. Meanwhile, pure silver particles in the two hybrid nanoparticles presented spherical shape and had the similar size of 15 nm. The antibacterial activities and cytotoxicity of the two structural Ag-PEG nanoparticles were investigated to understand colloid morphology effect on the properties of AgNPs. The results of antibacterial activities showed that the two structural Ag-PEG nanoparticles exhibited strong antibacterial activities against Staphylococcus aureus, Escherichia coli and Bacillus subtilis. The Janus nanoparticles had larger minimal inhibitory concentration (MIC) and minimum bacterial concentration (MBC) values than the multi-core shell counterparts. The results of cytotoxicity showed the Janus Ag-PEG nanoparticles had lower toxicity than the multi-core shell nanoparticles.

PREPARATION AND CHARACTERIZATION OF SURFACE-FUNCTIONALIZATION OF SILICA-COATED MAGNETITE NANOPARTICLES FOR DRUG DELIVERY

NANO ◽  
2014 ◽  
Vol 09 (04) ◽  
pp. 1450042 ◽  
Author(s):  
CONG-WANG ZHANG ◽  
CHANG-CHUN ZENG ◽  
YING XU
Keyword(s):  
Drug Delivery ◽  
Shell Structure ◽  
Drug Carrier ◽  
Point Of View ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
The Core ◽  
Application Potential ◽  
Core Shell Structure ◽  
Core Shell Nanoparticles

Fe 3 O 4– SiO 2 core–shell structure nanoparticles containing magnetic properties were investigated for their potential use in drug delivery. The Fe 3 O 4– SiO 2 core–shell structure nanoparticles were successfully synthesized by a simple and convenient way. The Fe 3 O 4– SiO 2 nanoparticles showed superparamagnetic behavior, indicating a great application potential in separation technologies. From the application point of view, the prepared nanoparticles were found to act as an efficient drug carrier. Specifically, the surface of the core–shell nanoparticles was modified with amino groups by use of silane coupling agent 3-aminopropyltriethoxysilane (APTS). Doxorubicin (DOX) was successfully grafted to the surface of the core–shell nanoparticles after the decoration with the carboxyl acid groups on the surface of amino-modified core–shell structure nanoparticles. Moreover, the nanocomposite showed a good drug delivery performance in the DOX-loading efficiency and drug release experiments, confirming that the materials had a great application potential in drug delivery. It is envisioned that the prepared materials are the ideal agent for application in medical diagnosis and therapy.

Preparation and studies of Ag–TiO2 hybrid nanoparticles of core-shell structure

1999 ◽  
Vol 67 (3) ◽  
pp. 95-98 ◽  
Author(s):  
Y Zhou ◽  
C.Y Wang ◽  
H.J Liu ◽  
Y.R Zhu ◽  
Z.Y Chen
Keyword(s):  
Shell Structure ◽  
Hybrid Nanoparticles ◽  
Core Shell ◽  
Core Shell Structure

A BIO-INSPIRED POLYDOPAMINE APPROACH TO PREPARATION OF GOLD-COATED Fe3O4 CORE–SHELL NANOPARTICLES: SYNTHESIS, CHARACTERIZATION AND MECHANISM

NANO ◽  
2013 ◽  
Vol 08 (06) ◽  
pp. 1350061 ◽  
Author(s):  
PENG AN ◽  
FANG ZUO ◽  
XINHUA LI ◽  
YUANPENG WU ◽  
JUNHUA ZHANG ◽  
...  
Keyword(s):  
Shell Structure ◽  
Room Temperature ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Stabilizing Agent ◽  
X Ray ◽  
Transmission Electron ◽  
Core Shell Structure ◽  
Core Shell Nanoparticles

A biomimetic and facile approach for integrating Fe 3 O 4 and Au with polydopamine (PDA) was proposed to construct gold-coated Fe 3 O 4 nanoparticles ( Fe 3 O 4@ Au – PDA ) with a core–shell structure by coupling in situ reduction with a seed-mediated method in aqueous solution at room temperature. The morphology, structure and composition of the core–shell structured Fe 3 O 4@ Au – PDA nanoparticles were characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectrometry (XPS). The formation process of Au shell was assessed using a UV-Vis spectrophotometer. More importantly, according to investigating changes in PDA molecules by Fourier transform infrared spectroscopy (FTIR) and in preparation process of the zeta-potential data of nanoparticles, the mechanism of core–shell structure formation was proposed. Firstly, PDA-coated Fe 3 O 4 are obtained using dopamine (DA) self-polymerization to form thin and surface-adherent PDA films onto the surface of a Fe 3 O 4 "core". Then, Au seeds are attached on the surface of PDA-coated Fe 3 O 4 via electrostatic interaction in order to serve as nucleation centers catalyzing the reduction of Au 3+ to Au 0 by the catechol groups in PDA. Accompanied by the deposition of Au , PDA films transfer from the surface of Fe 3 O 4 to that of Au as stabilizing agent. In order to confirm the reasonableness of this mechanism, two verification experiments were conducted. The presence of PDA on the surface of Fe 3 O 4@ Au – PDA nanoparticles was confirmed by the finding that glycine or ethylenediamine could be grafted onto Fe 3 O 4@ Au – PDA nanoparticles through Schiff base reaction. In addition, Fe 3 O 4@ Au – DA nanoparticles, in which DA was substituted for PDA, were prepared using the same method as that for Fe 3 O 4@ Au – PDA nanoparticles and characterized by UV-Vis, TEM and FTIR. The results validated that DA possesses multiple functions of attaching Au seeds as well as acting as both reductant and stabilizing agent, the same functions as those of PDA.

Synthesis of polyethylene glycol-polystyrene core-shell structure particles in a plasma-fluidized bed reactor

2011 ◽  
Vol 28 (2) ◽  
pp. 627-632 ◽  
Author(s):  
Lee-Hwa Song ◽  
Soung Hee Park ◽  
Soon Hwa Jung ◽  
Sang Done Kim ◽  
Seung Bin Park
Keyword(s):  
Polyethylene Glycol ◽  
Fluidized Bed ◽  
Shell Structure ◽  
Fluidized Bed Reactor ◽  
Core Shell ◽  
Core Shell Structure

scholarly journals Preparation, optical properties, and thermal stability of polyvinyl butyral composite films containing core (lanthanum hexaboride)–shell (titanium dioxide)-structured nanoparticles

2021 ◽  
Vol 28 (1) ◽  
pp. 605-612
Author(s):  
Hongbo Tang ◽  
Jian Zhou ◽  
Shengkui Zhong ◽  
Yuchang Su ◽  
Qunwei Shu ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Shell Structure ◽  
Near Infrared ◽  
Sol Gel ◽  
Visible Region ◽  
Polyvinyl Butyral ◽  
Lanthanum Hexaboride ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Structure

Abstract Nano-sized lanthanum hexaboride (LaB6)@ titanium dioxide (TiO2) particles with a core–shell structure has been successfully synthesized via a simple sol–gel method. LaB6@TiO2 particles were used as filler in polyvinyl butyral (PVB) matrix and performance of the TiO2 shell was evaluated. The core–shell nanoparticles were characterized for morphology and structure properties. X-ray diffraction and transmission electron microscope testing results confirm the formation of LaB6–TiO2 core–shell structure. In composite film, LaB6 improved the thermo-decomposing temperature of PVB matrix from 369.2 to 372.8°C, while the same amount of LaB6@TiO2 further increased the temperature to 381.0°C. In addition, TiO2 shell redshifted the maximum transmittance of the film from 605 to 669 nm in the visible region. In the near infrared region, its absorption peak shifted from 1,466 to 1,476 nm. This result will be helpful for the development of transparent and thermal insulating materials.

scholarly journals Simple hydrothermal synthesis of Fe3O4-PEG nanocomposite

2013 ◽  
Vol 11 (9) ◽  
pp. 1527-1532 ◽  
Author(s):  
Yasmeen Junejo ◽  
Abdulhadi Baykal ◽  
Huseyin Sözeri
Keyword(s):  
Polyethylene Glycol ◽  
Hydrothermal Synthesis ◽  
Fe3o4 Nanoparticles ◽  
Shell Structure ◽  
Polymer Coating ◽  
Core Shell ◽  
Vibrating Sample Magnetometer ◽  
One Step ◽  
Core Shell Structure ◽  
Fe3o4 Core

AbstractAbstract We report a one-step hydrothermal synthesis of Fe3O4 nanoparticles coated with Polyethyleneglycol (PEG). The formation of the Fe3O4 core and the polymer coating took place simultaneously. Fe3O4/polyethylene glycol (PEG) magnetic nanocomposite with a core-shell structure with a 17±7 nm crystallite size prepared by simple hydrothermal method. VSM ( Vibrating Sample Magnetometer) analysis proved the superparamagnetic character of the nanocomposite. Graphical abstract

Superheating and melting within aluminum core–oxide shell nanoparticles for a broad range of heating rates: multiphysics phase field modeling

2016 ◽  
Vol 18 (41) ◽  
pp. 28835-28853 ◽  
Author(s):  
Yong Seok Hwang ◽  
Valery I. Levitas
Keyword(s):  
Heating Rate ◽  
Phase Field ◽  
Shell Structure ◽  
Oxide Shell ◽  
Core Shell ◽  
Heating Rates ◽  
Phase Field Modeling ◽  
Shell Nanoparticles ◽  
Field Modeling ◽  
Core Shell Structure

Melting temperature of an Al nanoparticle encapsulated within an oxide shell depends on the heating rate and the geometry of a core–shell structure.

scholarly journals 2D analysis of polydisperse core–shell nanoparticles using analytical ultracentrifugation

The Analyst ◽  
2017 ◽  
Vol 142 (1) ◽  
pp. 206-217 ◽  
Author(s):  
Johannes Walter ◽  
Gary Gorbet ◽  
Tugce Akdas ◽  
Doris Segets ◽  
Borries Demeler ◽  
...  
Keyword(s):  
Shell Structure ◽  
Analytical Ultracentrifugation ◽  
Accurate Determination ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Structure ◽  
Core Shell Nanoparticles

A tool for the 2D analysis of polydisperse core–shell nanoparticles using analytical ultracentrifugation is presented. It allows for the accurate determination of sizes and densities of sub-10 nm particles, thereby revealing important information on their core–shell structure.

Designed self-assembled hybrid Au@CdS core–shell nanoparticles with negative charge and their application as highly selective biosensors

2015 ◽  
Vol 3 (2) ◽  
pp. 217-224 ◽  
Author(s):  
Wuxiang Zhang ◽  
Jianzhong Zheng ◽  
Changhui Tan ◽  
Xuan Lin ◽  
Shirong Hu ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Shell Structure ◽  
Negative Charge ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Structure ◽  
Self Assembled ◽  
Core Shell Nanoparticles

Schematic illustration of the reaction mechanism of Au@CdS core–shell structure with DA in the presence of UA and AA.

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