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

Polymers ◽  
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.

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

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3422
Author(s):  
Jin Soon Han ◽  
Gye Seok An
Keyword(s):  
Plasmid Dna ◽  
Room Temperature ◽  
Sio2 Nanoparticles ◽  
Superparamagnetic Nanoparticles ◽  
Core Shell ◽  
Dense Layer ◽  
Sio2 Coating ◽  
Sio2 Shell ◽  
Rapid Purification ◽  
Superparamagnetic Properties

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.

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

Catalysts ◽  
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.

ZnxMn1–XFe2O4@SiO2:zNd3+ Core–Shell Nanoparticles for Low-Field Magnetic Hyperthermia and Enhanced Photothermal Therapy with the Potential for Nanothermometry

2021 ◽  
Vol 4 (2) ◽  
pp. 2190-2210
Author(s):  
Marcus Vinícius-Araújo ◽  
Navadeep Shrivastava ◽  
Ailton A. Sousa-Junior ◽  
Sebastiao A. Mendanha ◽  
Ricardo Costa De Santana ◽  
...  
Keyword(s):  
Photothermal Therapy ◽  
Magnetic Hyperthermia ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Low Field ◽  
Core Shell Nanoparticles

Synthesis and characterization of core-shell SiO2 nanoparticles/poly(3-aminophenylboronic acid) composites

2007 ◽  
Vol 104 (4) ◽  
pp. 2743-2750 ◽  
Author(s):  
Yu-Ping Zhang ◽  
Se-Hee Lee ◽  
Kakarla Raghava Reddy ◽  
Anantha Iyengar Gopalan ◽  
Kwang-Pill Lee
Keyword(s):  
Sio2 Nanoparticles ◽  
Synthesis And Characterization ◽  
Core Shell ◽  
Aminophenylboronic Acid

scholarly journals Synthesis, magnetic and optical properties of core/shell Co1-x Zn x Fe2O4/SiO2 nanoparticles

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Emad Girgis ◽  
Mohamed MS Wahsh ◽  
Atef GM Othman ◽  
Lokeshwar Bandhu ◽  
KV Rao
Keyword(s):  
Optical Properties ◽  
Sio2 Nanoparticles ◽  
Core Shell

Coating thickness determination in highly absorbent core–shell systems

2012 ◽  
Vol 45 (5) ◽  
pp. 906-913 ◽  
Author(s):  
Herve Palancher ◽  
Anne Bonnin ◽  
Veijo Honkimäki ◽  
Heikki Suhonen ◽  
Peter Cloetens ◽  
...  
Keyword(s):  
Coating Thickness ◽  
Protective Layer ◽  
Test Sample ◽  
High Energy ◽  
Core Shell ◽  
Single Shot ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alloy Particles ◽  
Potential Applications

This article describes a single-shot methodology to derive an average coating thickness in multi-particle core–shell systems exhibiting high X-ray absorption. Powder composed of U–Mo alloy particles surrounded by a micrometre-thick UO2protective layer has been used as a test sample. Combining high-energy X-ray diffraction and laser granulometry, the average shell thickness could be accurately characterized. These results have been validated by additional measurements on single particles by two techniques: X-ray nanotomography and high-energy X-ray diffraction. The presented single-shot approach gives rise to many potential applications on core–shell systems and in particular on as-fabricated heterogeneous nuclear fuels.

Preparation of radioactive core-shell type 198Au@SiO2 nanoparticles as a radiotracer for industrial process applications

2010 ◽  
Vol 68 (6) ◽  
pp. 1025-1029 ◽  
Author(s):  
Sung-Hee Jung ◽  
Kyo-Il Kim ◽  
Jung-Ho Ryu ◽  
Seong-Ho Choi ◽  
Jong-Bum Kim ◽  
...  
Keyword(s):  
Industrial Process ◽  
Sio2 Nanoparticles ◽  
Core Shell ◽  
Shell Type

scholarly journals A critical review on the development and performance of polymer/graphene nanocomposites

2018 ◽  
Vol 25 (6) ◽  
pp. 1059-1073 ◽  
Author(s):  
Weifeng Chen ◽  
Hu Weimin ◽  
Dejiang Li ◽  
Shaona Chen ◽  
Zhongxu Dai
Keyword(s):  
Polymer Nanocomposites ◽  
Electronic Conductivity ◽  
Future Research ◽  
Preparation Methods ◽  
Graphene Nanocomposites ◽  
Advantages And Disadvantages ◽  
Solution Blending ◽  
Potential Applications ◽  
New Type ◽  
And Performance

AbstractGraphene (graphene) is a new type of two-dimensional inorganic nanomaterial developed in recent years. It can be used as an ideal inorganic nanofiller for the preparation of polymer nanocomposites because of its high mechanical strength, excellent electrical conductivity and plentiful availability (from graphite). In this review, the preparation methods of graphene/polymer nanocomposites, including solution blending, melt blending and in situ polymerization, are introduced in order to study the relationship between these methods and the final characteristics and properties. Each method has an influence on the final characteristics and properties of the nanocomposites. The advantages and disadvantages of these methods are discussed. In addition, a variety of nanocomposites with different properties, such as mechanical properties, electronic conductivity, thermal conductivity and thermal properties, are summarized comprehensively. The potential applications of these nanocomposites in conductive materials, electromagnetic shielding materials, photocatalytic materials and so on, are briefly presented. This review demonstrates that polymer/graphene nanocomposites exhibit superior comprehensive performance and will be applied in the fields of new materials and novel devices. Future research directions of the nanocomposites are also presented.

Solid Bridging during Pattern Collapse (Stiction) Studied on Silicon Nanoparticles

2011 ◽  
Vol 1299 ◽  
Author(s):  
Daniel Peter ◽  
Michael Dalmer ◽  
Andriy Lotnyk ◽  
Lorenz Kienle ◽  
Alfred Lechner ◽  
...  
Keyword(s):  
Silicon Nanoparticles ◽  
High Surface ◽  
Volume Ratio ◽  
Model System ◽  
Core Shell ◽  
Surface Phenomena ◽  
Drying Process ◽  
Sio2 Shell ◽  
Local View ◽  
Shell Particles

ABSTRACTThe high surface to volume ratio of nanoparticles allows a detailed experimental study of the surface phenomena associated with solid bridging. Besides bulk analyses, the local view on the structure and composition via HRTEM is particularly essential. 50 nm core shell particles consisting of a silicon (Si) core and a SiO2 shell were used as model system to understand surface phenomena appearing for Si-based nanostructures. Evaporative drying from de-ionized water shows the most significant bridging effect based on SiO2. There is only a localized deposition of oxides between the particles during the drying process and no overall oxidation. For the deposition material, silicates are the most likely candidates.

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