scholarly journals Linear Assembles of BN Nanosheets, Fabricated in Polymer/BN Nanosheet Composite Film

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Hong-Baek Cho ◽  
Tadachika Nakayama ◽  
Tsuneo Suzuki ◽  
Satoshi Tanaka ◽  
Weihua Jiang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electric Field ◽  
Composite Film ◽  
High Speed ◽  
Film Plane ◽  
Digital Microscopy ◽  
X Ray Diffraction ◽  
High Anisotropy ◽  
Dc Electric Field ◽  
First Time

Linear assembles of BN nanosheets (LABNs) were fabricated in polysiloxane/BN nanosheet composite film under a high DC electric field. The hexagonal BN nanosheets were dispersed by sonication in a prepolymer mixture of polysiloxane followed by a high-speed mixing. The homogeneous suspension was cast on a spacer of microscale thickness and applied to a high DC electric field before it became cross-linked. X-ray diffraction, scanning electron microscopy, and digital microscopy revealed that LABNs formed in the polysiloxane matrix and that the BN nanosheets in the LABNs were aligned perpendicular to the film plane with high anisotropy. This is the first time that linear assemblies of nanosheets have been fabricated in an organic-inorganic hybrid film by applying a DC electric field. The enhanced thermal conductivity of the composite film is attributed to the LABNs. The LABN formation and heat conduction mechanisms are discussed. The polysiloxane/BN nanosheet composite film has the potential to be used semiconductor applications that require both a high thermal conductivity and a high electric insulation.

scholarly journals Передача крутящего момента проводящей частице с использованием силы Лоренца

2022 ◽  
Vol 56 (1) ◽  
pp. 76
Author(s):  
А.И. Грачев
Keyword(s):  
Dipole Moment ◽  
Electric Field ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Field Application ◽  
Conductive Particle ◽  
Particle Rotation ◽  
Dc Electric Field ◽  
First Time ◽  
Cylindrical Particles

In the paper the concept of conductive particle rotation in DC electric field with including the Lorentz force providing generation of electric dipole moment of the particle is for the first time discussed. Some models of the torque transfer to spherical and cylindrical particles based on of the Hall effect at usual geometry and with additional electric field application and also in the case of implementation of the photoelectromagnetic effect are presented.

AC electric field controlled non-Newtonian filament thinning and droplet formation on the microscale

Lab on a Chip ◽  
2017 ◽  
Vol 17 (17) ◽  
pp. 2969-2981 ◽  
Author(s):  
Y. Huang ◽  
Y. L. Wang ◽  
T. N. Wong
Keyword(s):  
Flow Field ◽  
Electric Field ◽  
Newtonian Fluid ◽  
High Speed ◽  
Droplet Formation ◽  
Particle Imaging Velocimetry ◽  
Ac Electric Field ◽  
Formation Dynamics ◽  
Particle Imaging ◽  
First Time

We investigate the AC electric field controlled filament thinning and droplet formation dynamics of one non-Newtonian fluid. Furthermore, for the first time, we quantitatively measure the flow field of the non-Newtonian droplet formation under the influence of AC electric field, via a high-speed micro particle imaging velocimetry (μPIV) system. We discover the viscoelasticity contributes to the discrepancies majorly.

scholarly journals Preparation of N-Doped TiO2-ZrO2Composite Films under Electric Field and Heat Treatment and Assessment of Their Removal of Methylene Blue from Solution

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Lefu Mei ◽  
Ranfang Zuo ◽  
Jing Xie ◽  
Libing Liao ◽  
Hao Ding
Keyword(s):  
Methylene Blue ◽  
Electric Field ◽  
Visible Light ◽  
Composite Film ◽  
Photoelectron Spectroscopy ◽  
Composite Films ◽  
Partial Replacement ◽  
Cutoff Wavelength ◽  
X Ray Diffraction ◽  
X Ray

TiO2-ZrO2composite film with the grain size of 50 nm was synthesized by electric field and heat (EF&H) treatments. Portions of O atoms in the TiO2network structure were replaced by N atoms as revealed by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses, suggesting formation of a nonstoichiometric compoundTiO2-xNxon the composite film. The UV-Vis spectra of the film suggested that the visible light with wavelength of 550 nm could be absorbed for the N-doped composite film after EF&H treatment in comparison to a cutoff wavelength of 400 nm for the composite film without EF treatment. Photocatalytic experiments showed that the degradation rate of methylene blue by N-doped composite films increased significantly under visible light irradiation. The partial replacement of O by doped N played a very important role in narrowing the band gap and improving the visible light photocatalytic reactivity.

Structure Characterization of Polymer/Oriented Graphite Nanosheet Composite by Electric Field-Inducement

2012 ◽  
Vol 455-456 ◽  
pp. 528-532 ◽  
Author(s):  
Hong Yan Zhang ◽  
Hai Quan Wang
Keyword(s):  
Electric Field ◽  
Composite Film ◽  
Unsaturated Polyester ◽  
Expanded Graphite ◽  
Structure Characterization ◽  
Light Transmittance ◽  
Graphite Nanosheets ◽  
Graphite Nanosheet ◽  
Dc Electric Field ◽  
Oriented Parallel

Graphite nanosheets (GNs) prepared by sonicating expanded graphite were homogeneously dispersed in unsaturated polyester resin using sonication. The dispersion with a curing agent was then subjected to a dc electric field, followed by crosslinking, to fabricate a polymer/GN composite film. Scanning electron microscopy revealed that the GNs in the film were oriented parallel to the electric field. UV-VIS measurements indicated that the optical properties of the field-induced composite film showed significant improvement in visible light transmittance compared with those prepared without the electric field.

Thermal expansion of nano–boron carbide under constant DC electric field: An in situ energy dispersive X-ray diffraction study using a synchrotron probe

2020 ◽  
Vol 35 (1) ◽  
pp. 90-97
Author(s):  
Hülya Biçer ◽  
Enver Koray Akdoğan ◽  
İlyas Şavklıyıldız ◽  
Christopher Haines ◽  
Zhong Zhong ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Electric Field ◽  
Boron Carbide ◽  
Diffraction Study ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dc Electric Field ◽  
Image Position

Abstract

scholarly journals Electric Field Simulation and Effect of Different Solvent Ratios on the Performance of Single Electrospun PVDF/PEI Composite Film

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Jin-gang Jiang ◽  
Zhao Wang ◽  
Hong-wei Duan ◽  
Jing-qiang Liu ◽  
Xiao-wei Guo
Keyword(s):  
Mechanical Properties ◽  
Electric Field ◽  
Composite Film ◽  
Polyvinylidene Fluoride ◽  
Mixed Solvent ◽  
Composite Fiber ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Fiber Membranes ◽  
Vector Distribution

On the basis of the finite element calculation theory of electric field, the electric field distribution in a representative electrospinning device is computed. The electric field structure of a needle-plate type electrospinning device was simulated by means of ANSYS software. And the vector distribution of the nozzle on the spinneret pipe was got. For the purpose of the analysis on the influence of different solvent ratios on the performance of a single electrospun PVDF/PEI composite film, polyvinylidene fluoride and polyetherimide with a mass ratio of 8/2 were dissolved in a mixed solvent. The mixed solvent is composed of N,N-dimethylformamide and tetrahydrofuran, added in different proportions. Through the electrostatic spinning technology, PVDF/PEI composite fiber membranes were prepared. Using scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and mechanical properties testing, the effects of tetrahydrofuran on the composite microstructure, crystallinity, and mechanical properties of the PVDF/PEI composite fiber membranes are discussed.

scholarly journals Space Charge Characteristic of Nano-composite Film of MgO/LDPE under DC Electric Field

2006 ◽  
Vol 126 (11) ◽  
pp. 1078-1083 ◽  
Author(s):  
Yoshinobu Murakami ◽  
Masanori Nemoto ◽  
Rudi Kurnianto ◽  
Naohiro Hozumi ◽  
Masayuki Nagao ◽  
...  
Keyword(s):  
Electric Field ◽  
Composite Film ◽  
Space Charge ◽  
Nano Composite ◽  
Charge Characteristic ◽  
Dc Electric Field

Electrokinetic Microflow Instability With Conductivity Gradients

2003 ◽  
Author(s):  
Chuan-Hua Chen ◽  
Hao Lin ◽  
Sanjiva K. Lele ◽  
Juan G. Santiago
Keyword(s):  
Electric Field ◽  
Convective Instability ◽  
Flow Instability ◽  
Microfluidic Channels ◽  
Charge Accumulation ◽  
Electrokinetic Flow ◽  
Dc Electric Field ◽  
Bulk Charge ◽  
First Time ◽  
And Diffusion

We have experimentally identified and quantified an electrokinetic flow instability that occurs in DC-electric-field driven microfluidic channels with significant conductivity gradients. We have, for the first time, developed a physical model for this instability which captures the interactions between bulk charge accumulation, electromigration, convection, and diffusion. A linear stability analysis based on this model captures key physics of this convective instability with a threshold electric field. The model and experiments show conductivity gradients and their associated bulk charge accumulation are crucial for such instabilities.

Modification of Ferroelectric Properties of TGS Crystals Grown under a dc Electric field

2000 ◽  
Vol 658 ◽  
Author(s):  
G. Arunmozhi ◽  
E. Nogueira ◽  
E.de Matos Gomes ◽  
S. Lanceros-Mendez ◽  
M. Margarida ◽  
...  
Keyword(s):  
Dielectric Permittivity ◽  
Electric Field ◽  
Ferroelectric Phase ◽  
Ferroelectric Properties ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Triglycine Sulphate ◽  
X Ray ◽  
Dc Electric Field ◽  
Diffraction Patterns

ABSTRACTFerroelectric triglycine sulphate crystals have been grown under the influence of an intense electric field of 6×104 V/m. Relative to crystals grown under ambient conditions (TGS) the crystals grown under the electric field (TGS-E) display a dielectric permittivity a factor of two lower. Significant differences are observed in the Curie-Weiss behavior of the ferroelectric phase, in the x-ray diffraction patterns and in the differential calorimetry measurements.

scholarly journals The Effect of Reactive Electric Field-Assisted Sintering of MoS2/Bi2Te3 Heterostructure on the Phase Integrity of Bi2Te3 Matrix and the Thermoelectric Properties

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 53
Author(s):  
Yanan Wang ◽  
Cédric Bourgès ◽  
Ralph Rajamathi ◽  
C. Nethravathi ◽  
Michael Rajamathi ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Electric Field ◽  
Hydrothermal Reaction ◽  
X Ray Diffraction ◽  
Nanocomposite Structure ◽  
X Ray ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Field Assisted Sintering

In this work, a series of Bi2Te3/X mol% MoS2 (X = 0, 25, 50, 75) bulk nanocomposites were prepared by hydrothermal reaction followed by reactive spark plasma sintering (SPS). X-ray diffraction analysis (XRD) indicates that the native nanopowders, comprising of Bi2Te3/MoS2 heterostructure, are highly reactive during the electric field-assisted sintering by SPS. The nano-sized MoS2 particles react with the Bi2Te3 plates matrix forming a mixed-anion compound, Bi2Te2S, at the interface between the nanoplates. The transport properties characterizations revealed a significant influence of the nanocomposite structure formation on the native electrical conductivity, Seebeck coefficient, and thermal conductivity of the initial Bi2Te3 matrix. As a result, enhanced ZT values have been obtained in Bi2Te3/25 mol% MoS2 over the temperature range of 300–475 K induced mainly by a significant increase in the electrical conductivity.

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