Preparation of Dual-Layered Core–Shell Fe3O4@SiO2 Nanoparticles and Their Properties of Plasmid DNA Purification

The rapid purification of biomaterials such as DNA, RNA, and antibodies has attracted extensive attention, and research interest has increased further with the COVID-19 pandemic. In particular, core–shell-structured superparamagnetic nanoparticles have been continuously studied for their application as biopurification materials. It has been reported that Fe3O4@SiO2 nanoparticles are one of the most promising candidates for separating nucleic acids via a simple and rapid process. This study proposed a fabrication method for dual-layered Fe3O4@SiO2 nanoparticles, in which the density of the SiO2 shell was controlled using an intermediate surfactant during the SiO2 coating. After the fabrication of dual-layered Fe3O4@SiO2 nanoparticles, structural, morphological, and magnetic analyses were conducted. The results showed that the Fe3O4 nanoparticles were surrounded by a dense layer 15.6~27.9 nm thick and a porous layer 24.2~44.4 nm thick, and had superparamagnetic properties with high saturated magnetization at room temperature (86.9 emu/g). Then, the optimal conditions for the biopurification material were suggested based on analysis of the selective separation of plasmid DNA.

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Core/Shell Fe3O4@SiO2 Nanoparticles Modified with PAH as a Vector for EGFP Plasmid DNA Delivery into HeLa Cells

Macromolecular Bioscience ◽

10.1002/mabi.201100150 ◽

2011 ◽

pp. n/a-n/a ◽

Cited By ~ 2

Author(s):

Mengran Shi ◽

Yiyao Liu ◽

Mingming Xu ◽

Hong Yang ◽

Chunhui Wu ◽

...

Keyword(s):

Hela Cells ◽

Plasmid Dna ◽

Dna Delivery ◽

Sio2 Nanoparticles ◽

Core Shell

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Self-Assembled Core-Shell Fe3O4@SiO2 Nanoparticles with High Magnetic Sensitivity from Electrospun Fibers

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1033-1034.1068 ◽

2014 ◽

Vol 1033-1034 ◽

pp. 1068-1071

Author(s):

Li Qiang Tian ◽

Pei Pei Zhang

Keyword(s):

Self Assembly ◽

Cetyltrimethylammonium Bromide ◽

Room Temperature ◽

Electrospinning Process ◽

Core Shell ◽

Shell Nanoparticles ◽

Practical Applications ◽

Magnetic Sensitivity ◽

Core Shell Nanoparticles ◽

Superparamagnetic Properties

Nanofibers composed of the hydrophilic polymer polyvinylpyrrolidone K90 (PVP), cetyltrimethylammonium bromide (CTAB), tetraethyl orthosilicate (TEOS) and Fe3O4were fabricated using an electrospinning process. As a result of the templating and confinement properties of the nanfibers, silica coated magnetite (Fe3O4@SiO2) core-shell nanoparticles (NPs) with high magnetic sensitivity were spontaneously formed through molecular self-assembly when the fibers were added to 80% aqueous ethanol (PH=9.0). The typical saturation magnetization of the Fe3O4@SiO2composite particles is up to 43.8 emu/g, with superparamagnetic properties being observed at room temperature. Since the nanoparticles have high magnetic sensitivity and are preparedviaa facile and convenient strategy, they have much promise in a range of practical applications.

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Magnetic properties of core–shell nanoparticles possessing a novel Fe(ii)-chromia phase: an experimental and theoretical approach

Nanoscale ◽

10.1039/c7nr04770c ◽

2018 ◽

Vol 10 (4) ◽

pp. 2138-2147 ◽

Cited By ~ 10

Author(s):

Mohammad Delower Hossain ◽

Robert A. Mayanovic ◽

Ridwan Sakidja ◽

Mourad Benamara ◽

Richard Wirth

Keyword(s):

Magnetic Properties ◽

Theoretical Approach ◽

Room Temperature ◽

Core Shell ◽

Shell Nanoparticles ◽

Core Shell Nanoparticles ◽

Superparamagnetic Properties

Highly ordered bimagnetic core–shell nanoparticles exhibit room-temperature ferrimagnetic and superparamagnetic properties.

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Enhanced Electromechanical Property of Silicone Elastomer Composites Containing TiO2@SiO2 Core-Shell Nano-Architectures

Polymers ◽

10.3390/polym13030368 ◽

2021 ◽

Vol 13 (3) ◽

pp. 368

Author(s):

Shuyan Gao ◽

Hang Zhao ◽

Na Zhang ◽

Jinbo Bai

Keyword(s):

Sio2 Nanoparticles ◽

Electromechanical Property ◽

Core Shell ◽

Electric Voltage ◽

Solution Blending ◽

Sio2 Shell ◽

Low Field ◽

Potential Applications ◽

Interfacial Compatibility ◽

Elastomer Composites

Dielectric elastomer (DE) is one type of promising field-activated electroactive polymer. However, its significant electromechanical actuated properties are always obtained under a giant electric voltage, which greatly restricts the potential applications of DE. In the present work, the well-constructed core-shell TiO2@SiO2 nanoparticles were fabricated by using the classical Stöber method. A series of TiO2@SiO2 nano-architectures-filled polydimethylsiloxane (PDMS) composites were prepared via solution blending and compression-molding procedures. Benefiting from the additional SiO2 shell, both the interfacial compatibility between fillers and matrix and core-shell interfacial interaction can be improved. The TiO2@SiO2/PDMS nanocomposites exhibit a significantly enhanced in-plane actuated strain of 6.08% under a low electric field of 30 V·μm−1 at 16 vol.% TiO2@SiO2 addition, which is 180% higher than that of neat PDMS. The experimental results reveal that the well-designed core-shell structure can play an important role in both improving the electromechanical actuated property and maintaining a good flexibility of DE composites. This research provides a promising approach for the design of the novel composites with advanced low-field actuated electromechanical property in next generation DE systems.

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Iron Based Core-Shell Structures as Versatile Materials: Magnetic Support and Solid Catalyst

Catalysts ◽

10.3390/catal11010072 ◽

2021 ◽

Vol 11 (1) ◽

pp. 72

Author(s):

Christian Zambrzycki ◽

Runbang Shao ◽

Archismita Misra ◽

Carsten Streb ◽

Ulrich Herr ◽

...

Keyword(s):

Water Purification ◽

Functional Materials ◽

Core Material ◽

Solid Catalyst ◽

Core Shell ◽

Shell Nanoparticles ◽

The Core ◽

Shell Nanostructures ◽

Sio2 Shell ◽

Iron Based

Core-shell materials are promising functional materials for fundamental research and industrial application, as their properties can be adapted for specific applications. In particular, particles featuring iron or iron oxide as core material are relevant since they combine magnetic and catalytic properties. The addition of an SiO2 shell around the core particles introduces additional design aspects, such as a pore structure and surface functionalization. Herein, we describe the synthesis and application of iron-based core-shell nanoparticles for two different fields of research that is heterogeneous catalysis and water purification. The iron-based core shell materials were characterized by transmission electron microscopy, as well as N2-physisorption, X-ray diffraction, and vibrating-sample magnetometer measurements in order to correlate their properties with the performance in the target applications. Investigations of these materials in CO2 hydrogenation and water purification show their versatility and applicability in different fields of research and application, after suitable individual functionalization of the core-shell precursor. For design and application of magnetically separable particles, the SiO2 shell is surface-functionalized with an ionic liquid in order to bind water pollutants selectively. The core requires no functionalization, as it provides suitable magnetic properties in the as-made state. For catalytic application in synthesis gas reactions, the SiO2-stabilized core nanoparticles are reductively functionalized to provide the catalytically active metallic iron sites. Therefore, Fe@SiO2 core-shell nanostructures are shown to provide platform materials for various fields of application, after a specific functionalization.

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Structural, Morphological, Magnetic and Self-Heating Studies of One-Step Polyol Synthesized Manganese Ferrite (MnFe2O4) Nanoparticles

International Journal of Nanoscience ◽

10.1142/s0219581x19500030 ◽

2019 ◽

Vol 19 (01) ◽

pp. 1950003

Author(s):

P. R. Ghutepatil ◽

S. H. Pawar

Keyword(s):

Room Temperature ◽

Synthesis Method ◽

Average Crystallite Size ◽

Superparamagnetic Nanoparticles ◽

Polyol Synthesis ◽

X Ray Diffraction ◽

Self Heating ◽

Transmission Electron ◽

One Step ◽

Mnfe2o4 Nanoparticles

In this paper, uniform and superparamagnetic nanoparticles have been prepared using one-step polyol synthesis method. Structural, morphological and magnetic properties of obtained MnFe2O4 nanoparticles have been investigated by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM) and thermogravimetric analysis (TGA) techniques. Structural investigation showed that the average crystallite size of obtained nanoparticles was about 10[Formula: see text]nm. Magnetic study revealed that the nanoparticles were superparamagnetic at room temperature with magnetization 67[Formula: see text]emu/g at room temperature. The self-heating characteristics of synthesized MnFe2O4 nanoparticles were studied by applying external AC magnetic field of 167.6 to 335.2[Formula: see text]Oe at a fixed frequency of 265[Formula: see text]kHz. The SAR values of MnFe2O4 nanoparticles were calculated for 2, 5, 10[Formula: see text]mg[Formula: see text]mL[Formula: see text] concentrations and it is observed that the threshold hyperthermia temperature is achieved for all concentrations.

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