scholarly journals Effect of TiO2Rutile Additive on Electrical Properties of PPy/TiO2Nanocomposite

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Trong Tung Nguyen ◽  
Ngoc Huyen Duong
Keyword(s):  
Electrical Properties ◽  
Colloidal Suspension ◽  
Inversion Layer ◽  
Core Shell ◽  
Shell Surface ◽  
Sem Images ◽  
Chemical Polymerization ◽  
Scan Rate ◽  
Core Shell Structure

Polypyrrole/titanium dioxide nanocomposite (PPy/TiO2) was synthesized byin situchemical polymerization of pyrrole (Py) monomer in colloidal suspension of TiO2rutile. TEM and SEM images show that the TiO2is covered by PPy forming a core-shell structure. The PPy/TiO2core-shell will createn-pjunction and bring in an inversion layer on the PPy-shell surface. The feature is accounted for the modification in electrical properties of the PPy/TiO2nanocomposite. On the exposure to oxygen the conductivity of the nanocomposite exhibits an increase in 16–18-folds that are accounted for the interaction between oxygen (an electron acceptor) and the inversion layer. The cyclic voltammetry diagrams have shown that at around 15% TiO2and scan rate 100 mV/s the nanocomposites can reach a specific capacitance about 176 F/g.

scholarly journals Effect of TiO\(_2\) anatase nanocrystallite on electrical properties of PPy/TiO\(_2\) nanocomposite

2018 ◽  
Vol 28 (1) ◽  
pp. 87
Author(s):  
Huyen Ngoc Duong ◽  
Thanh-Phuong Nguyen ◽  
Tung Trong Nguyen
Keyword(s):  
Titanium Dioxide ◽  
Electrical Properties ◽  
Random Distribution ◽  
Colloidal Suspension ◽  
Surface Conductance ◽  
Chemical Polymerization ◽  
Tio2 Anatase ◽  
Anatase Nanoparticles ◽  
Oxygen Interaction

Polypyrrole/titanium dioxide nanocomposite (PPy/TiO2) was synthesized by in-situ chemical polymerization of pyrrole (Py) monomer in colloidal suspension of TiO2 anatase. TEM images show that TiO2 anatase nanoparticles with size of around 3–4 nm are randomly imbedded on the surface and inside of PPy grain. The random distribution of TiO2 anatase nanoparticle in PPy matrix form variety of p-n contact on the surface and inside of the materials. As expectation, the charge exchange between oxygen and the PPy affect the p-n depletion regions and then modify the electrical properties of PPy. Upon exposure to the open air the conductivity of the PPy/TiO2 nanocomposite exhibits an increase of about 20 folds much larger than that of neat PPy. The enhancement is accounted for the modification of in the surface conductance of PPy/TiO2 nanocomposite as a combination of the TiO2 coupling and oxygen interaction.

Core/shell structured halloysite/polyaniline nanotubes with enhanced electrochromic properties

2018 ◽  
Vol 6 (21) ◽  
pp. 5707-5715 ◽  
Author(s):  
Fei Hu ◽  
Jianlong Xu ◽  
Sihang Zhang ◽  
Jie Jiang ◽  
Bin Yan ◽  
...  
Keyword(s):  
Shell Structure ◽  
Core Shell ◽  
Chemical Polymerization ◽  
Electrochromic Properties ◽  
Core Shell Structure ◽  
Polyaniline Nanotubes

Novel halloysite/polyaniline core/shell structure nanocomposites with remarkable electrochromic performances are fabricated by in situ chemical polymerization for electrochromic applications.

scholarly journals In Situ Synthesis of Core-Shell-Structured SiCp Reinforcements in Aluminium Matrix Composites by Powder Metallurgy

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1201
Author(s):  
Xinghua Ji ◽  
Cheng Zhang ◽  
Shufeng Li
Keyword(s):  
Particle Size ◽  
Powder Metallurgy ◽  
Shell Structure ◽  
Ex Situ ◽  
Aluminium Matrix ◽  
Core Shell ◽  
Matrix Composites ◽  
Aluminium Matrix Composites ◽  
Core Shell Structure

SiCp reinforced aluminium matrix composites (AMCs), which are widely used in the aerospace, automotive, and electronic packaging fields along with others, are usually prepared by ex situ techniques. However, interfacial contamination and poor wettability of the ex situ techniques make further improvement in their comprehensive performance difficult. In this paper, SiCp reinforced AMCs with theoretical volume fractions of 15, 20, and 30% are prepared by powder metallurgy and in situ reaction via an Al-Si-C system. Moreover, a combined method of external addition and an in situ method is used to investigate the synergistic effect of ex situ and in situ SiCp on AMCs. SiC particles can be formed by an indirect reaction: 4Al + 3C → Al4C3 and Al4C3 + 3Si → 3SiC + 4Al. This reaction is mainly through the diffusion of Si, in which Si diffuses around Al4C3 and then reacts with Al4C3 to form SiCp. The in situ SiC particles have a smooth boundary, and the particle size is approximately 1–3 μm. A core-shell structure having good bonding with an aluminium matrix was generated, which consists of an ex situ SiC core and an in situ SiC shell with a thickness of 1–5 μm. The yield strength and ultimate tensile strength of in situ SiCp reinforced AMCs can be significantly increased with a constant ductility by adding 5% ex situ SiCp for Al-28Si-7C. The graphite particle size has a significant effect on the properties of the alloy. A criterion to determine whether Al4C3 is a complete reaction is achieved, and the forming mechanism of the core-shell structure is analysed.

CORROSION PROTECTION OF ELECTROLESS PLATING Ni-P INCLUDING TiN NANOPARTICLES FOR BIPOLAR PLATES OF PEMFCs

2018 ◽  
Vol 25 (02) ◽  
pp. 1850052 ◽  
Author(s):  
GAO PINGPING ◽  
OUYANG CHUN ◽  
XIE ZHIYONG ◽  
TAO TAO
Keyword(s):  
Corrosion Resistance ◽  
Surface Morphology ◽  
Electroless Plating ◽  
Shell Structure ◽  
Compact Surface ◽  
Proton Exchange ◽  
Core Shell ◽  
Tin Coating ◽  
Sem Images ◽  
Core Shell Structure

The Ni-P/TiN coating was used as bipolar plate by electroless plating on Ti. Surface morphology and phase structure of the coatings were characterized by SEM and XRD, respectively. Corrosion resistance of Ni-P and Ni-P/TiN coating was measured in the simulated solution of Proton exchange membrane fuel cells (PEMFCs). The interfacial contact resistance (ICR) was conducted by applied different forces. SEM images indicated that the particles of core–shell structure were formed on the surface of coating on Ti substrate. The core–shell structure was composed of TiN core and Ni-P electroless plating shell. Compared with Ni-P coatings, the Ni-P/TiN coating showed better corrosion resistance behaviors and low ICR (below 10[Formula: see text]m[Formula: see text][Formula: see text] cm[Formula: see text] under pressure of 200 N/cm[Formula: see text]. TiN particles and distribution of core–shell were in favor of the formation of coating and compact surface morphology. The good conductivity was attributed to the compact surface morphology of coating. The Ni-P/TiN coating showed excellent interfacial conductivity and good corrosion resistance at applied high potential in simulated solution of PEMFCs.

Research of In Situ Polymerization and Core-Shell Structure Modified Emulsified Asphalt

2011 ◽  
Vol 71-78 ◽  
pp. 928-931
Author(s):  
Jin Liang Wu ◽  
Yong Xing Zhang ◽  
Chun Sun Zhang
Keyword(s):  
Shell Structure ◽  
In Situ Polymerization ◽  
Core Shell ◽  
Asphalt Emulsion ◽  
Sound Effect ◽  
Structure And Property ◽  
Modified Asphalt ◽  
Core Shell Structure ◽  
Emulsified Asphalt

Nowadays, there are dominantly two ways of producing modified emulsified asphalt ,one of which is to emulsify modified asphalt, the other to modify asphalt emulsion. But they have the same defect that modifier cannot be evenly mixed with asphalt emulsion, which has side effect on the performance of modified emulsified asphalt. The emulsified asphalt and modifier have different traits in structure and property. In order to make the modifier disperse in asphalt emulsion evenly to improve the performance of modified emulsified asphalt, a tentative idea is brought forward: we shall utilize in-situ polymerization and core-shell structure to enhance feature of emulsified asphalt. Core-shell structure is a method of synthesizing composite material, which can assist to achieve sound effect of the two kinds of materials. The point to emphasize is, in this paper, the introduction and feasibility of the method, its specialty against current mainly methods, the difficulties encountered in practice as well as its promising prospect and the anticipated target to achieve will all be illustrated.

In situ fabricated metal-carbide with core–shell structure for high impact-toughness iron-matrix composite

2019 ◽  
Vol 35 (14) ◽  
pp. 1727-1734
Author(s):  
Lisheng Zhong ◽  
Haiqiang Bai ◽  
Junzhe Wei ◽  
Jianlei Zhu ◽  
Jianhong Peng ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Matrix Composite ◽  
Shell Structure ◽  
High Impact ◽  
Core Shell ◽  
Metal Carbide ◽  
Iron Matrix ◽  
Fabricated Metal ◽  
Core Shell Structure

Novel conductive core–shell particles of elastomeric nanoparticles coated with polypyrrole

RSC Advances ◽  
2015 ◽  
Vol 5 (120) ◽  
pp. 98904-98909 ◽  
Author(s):  
Jiangru Zhang ◽  
Guicun Qi ◽  
Xiang Wang ◽  
Binghai Li ◽  
Zhihai Song ◽  
...  
Keyword(s):  
Shell Structure ◽  
Oxidative Polymerization ◽  
Core Shell ◽  
Conductive Particle ◽  
Core Shell Structure ◽  
Shell Particles ◽  
First Time

For the first time, an ultrafine conductive particle with core–shell structure, acrylonitrile-butadiene elastomeric nanoparticle (NBR-ENP) coated with polypyrrole (PPy), was prepared by in situ oxidative polymerization.

Largely enhanced electrical properties of polymer composites via the combined effect of volume exclusion and synergy

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 51900-51907 ◽  
Author(s):  
Kai Wu ◽  
Linyu Wu ◽  
Weixing Yang ◽  
Songgang Chai ◽  
Feng Chen ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Synergistic Effect ◽  
Core Shell ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
The Core ◽  
Emi Shielding Effectiveness ◽  
Core Shell Structure ◽  
Exclusion Effect

The core–shell structure of surface conductive SiO2@rGO could result in enhanced electrical conductivity and EMI shielding effectiveness as due to both synergistic effect and volume exclusion effect.

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