3D segregated architecture BaTiO3/polystyrene composites with enhanced dielectric constant fabricated via hot pressing core–shell polystyrene@BaTiO3 composite microspheres

2020 ◽  
Vol 31 (4) ◽  
pp. 3101-3110 ◽  
Author(s):  
Jian Ye ◽  
Biao Zhang ◽  
Yicheng Jin ◽  
Haoqian Zhang ◽  
Yingjie Qiao ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Hot Pressing ◽  
Core Shell ◽  
Composite Microspheres

Enhanced dielectric properties and thermostability in polyimide composites with core-shell structured polyimide@BaTiO3 nanoparticles

2021 ◽  
pp. 095400832199352
Author(s):  
Wei Deng ◽  
Guanguan Ren ◽  
Wenqi Wang ◽  
Weiwei Cui ◽  
Wenjun Luo
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Energy Density ◽  
Breakdown Strength ◽  
In Situ Polymerization ◽  
Dielectric Materials ◽  
High Energy ◽  
Amic Acid ◽  
High Energy Density ◽  
Core Shell

Polymer composites with high dielectric constant and thermal stability have shown great potential applications in the fields relating to the energy storage. Herein, core-shell structured polyimide@BaTiO3 (PI@BT) nanoparticles were fabricated via in-situ polymerization of poly(amic acid) (PAA) and the following thermal imidization, then utilized as fillers to prepare PI composites. Increased dielectric constant with suppressed dielectric loss, and enhanced energy density as well as heat resistance were simultaneously realized due to the presence of PI shell between BT nanoparticles and PI matrix. The dielectric constant of PI@BT/PI composites with 55 wt% fillers increased to 15.0 at 100 Hz, while the dielectric loss kept at low value of 0.0034, companied by a high energy density of 1.32 J·cm−3, which was 2.09 times higher than the pristine PI. Moreover, the temperature at 10 wt% weight loss reached 619°C, demonstrating the excellent thermostability of PI@BT/PI composites. In addition, PI@BT/PI composites exhibited improved breakdown strength and toughness as compared with the BT/PI composites due to the well dispersion of PI@BT nanofillers and the improved interfacial interactions between nanofillers and polymer matrix. These results provide useful information for the structural design of high-temperature dielectric materials.

Preparation of P(AM-co-MAA)-W-Ag Composite Microspheres with Core-Shell Structures

2008 ◽  
Vol 24 (04) ◽  
pp. 646-652
Author(s):  
WU Hua-Tao ◽  
◽  
◽  
ZHANG Ying ◽  
NING Xiang-Li ◽  
...  
Keyword(s):  
Shell Structures ◽  
Core Shell ◽  
Composite Microspheres

Enhanced dielectric properties of conductive-dielectric composites by reducing particle size and core@shell method

2018 ◽  
Vol 11 (01) ◽  
pp. 1850010 ◽  
Author(s):  
Yuqiang Guo ◽  
Yifei Wang ◽  
Yaxuan Ren ◽  
Mingzhu Fu ◽  
Hongmei Ma ◽  
...  
Keyword(s):  
Particle Size ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Mass Fraction ◽  
Core Shell ◽  
Particle Sizes ◽  
Conductive Particle ◽  
Threshold Theory ◽  
Conductive Polyaniline

Based on the percolation threshold theory of conductive-dielectric composites, the dielectric constant can be improved more by adding a certain mass fraction of conductive particle into polymer matrix. However, the dielectric loss increases with the increasing mass fraction of conductive particle. In this paper, conductive Polyaniline (PANI) with different particle sizes is utilized to illustrate that reducing particle size can improve the dielectric properties. The dielectric constant is increased from 319 to 540, and dielectric loss is decreased from 2.34 to 0.85 when PANI with smaller particle size is used. Moreover, PANI coated with an insulating surfactant layer can further improve the dielectric properties, the experimental results show that the dielectric constant of the composite could be more than 1000, while the dielectric loss is 0.35 at 1[Formula: see text]KHz.

Wearable high-dielectric-constant polymers with core–shell liquid metal inclusions for biomechanical energy harvesting and a self-powered user interface

2019 ◽  
Vol 7 (12) ◽  
pp. 7109-7117 ◽  
Author(s):  
Shengjie Gao ◽  
Ruoxing Wang ◽  
Chenxiang Ma ◽  
Zihao Chen ◽  
Yixiu Wang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
User Interface ◽  
Liquid Metal ◽  
High Dielectric Constant ◽  
Core Shell ◽  
Electronic Systems ◽  
Energy Devices ◽  
Wearable Electronic ◽  
Self Powered ◽  
High Dielectric

Deformable energy devices capable of efficiently scavenging ubiquitous mechanical signals enable the realization of self-powered wearable electronic systems for emerging human-integrated technologies.

SYNTHESIS AND PROPERTY OF MULTIFUNCTIONAL Fe3O4@SiO2@CeO2@Au COMPOSITE MICROSPHERES

NANO ◽  
2012 ◽  
Vol 07 (06) ◽  
pp. 1250042 ◽  
Author(s):  
YANG WANG ◽  
HAORAN SUN ◽  
TONG ZHANG ◽  
YUHUA SHEN ◽  
JIAN ZHANG ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Coating Layer ◽  
Solar Spectrum ◽  
Core Shell ◽  
Composite Microspheres ◽  
Wide Range ◽  
Spectrum Response

In this paper, Fe3O4@SiO2@CeO2@Au core/shell microspheres were synthesized through hydrolysis and solvothermal processes. The results indicated that the magnetic Fe3O4 cores were well wrapped by the coating layer of SiO2/CeO2 with a thickness of 50 nm, and Au nanoparticles with 35 nm in diameter were attached on the shell. The microspheres showed a monodispersity and superparamagnetism. The composites showed excellent ability to absorb a wide range of wavelengths including visible and NIR region (from 250 nm to 800 nm), making it a potential full solar spectrum response photocatalyst for sunlight applications.

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