scholarly journals Characterization of core-shell microstructure and self-healing performance of electrospun fiber coatings

Polymer ◽  
2016 ◽  
Vol 107 ◽  
pp. 263-272 ◽  
Author(s):  
Thu Q. Doan ◽  
L. Suzanne Leslie ◽  
Sang Yup Kim ◽  
Rohit Bhargava ◽  
Scott R. White ◽  
...  
Keyword(s):  
Electrospun Fiber ◽  
Core Shell ◽  
Self Healing ◽  
Shell Microstructure ◽  
Fiber Coatings

Preparation and characterization of core-shell oil absorption materials stabilized by modified fumed silica

2017 ◽  
Vol 37 (4) ◽  
pp. 391-399 ◽  
Author(s):  
Chun-yu Wang ◽  
Yu-huan Bu ◽  
Hua-jie Liu ◽  
Sheng-lai Guo
Keyword(s):  
Fumed Silica ◽  
Silica Shell ◽  
Alkali Resistance ◽  
Core Shell ◽  
Oil Well ◽  
Oil Absorption ◽  
Self Healing ◽  
Silica Wall ◽  
Well Cement

Abstract The core-shell oil absorption material (OAM) with fumed silica shell was achieved from Pickering polymerization. The modified fumed silica wall could well stabilize both Pickering emulsion and Pickering polymerization. The particle size of encapsulated OAMs decreased with the increasing concentration of fumed silica and remained unchanged when the concentration was more than 1 wt.%. This fumed silica shell had little effect on the oil absorption rate of OAM. The importance was that the shell reversed the surface property and improved the alkali resistance of OAM. We believe that our core-shell OAMs could reach the self-healing ability of the oil well cement.

scholarly journals Synthesis and Mechanical Characterization of a Ti(C,N)/Mo–Co–Ni/CaF2@Al2O3 Self-Lubricating Cermet

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3981
Author(s):  
Chuanhao Li ◽  
Mingdong Yi ◽  
Gaofeng Wei ◽  
Chonghai Xu
Keyword(s):  
Diffusion Mechanism ◽  
Core Shell ◽  
Material System ◽  
Sintering Process ◽  
Shell Microstructure ◽  
Nanocomposite Powder ◽  
Cermet Material ◽  
Temperature Liquid ◽  
Hot Pressing Sintering

In this paper, an Al2O3 coated CaF2 (CaF2@Al2O3) nanocomposite powder is used as the additive phase of a Ti(C,N)-based self-lubricating cermet material. A novel self-lubricating ceramic material with a multilayer core–shell microstructure was prepared using a vacuum hot-pressing sintering process. The results show that the surface of the CaF2 powder is coated with Al2O3, and when introduced into a Ti(C,N)–Mo–Co–Ni material system, it can utilize the high-temperature liquid phase diffusion mechanism of the metal Mo–Co–Ni phase in the sintering process. The CaF2@Al2O3@Mo–Co–Ni multilayer core–shell microstructure is formed in the material. Compared with the direct addition of CaF2 and Al2O3, the hardness and fracture toughness of the material are increased by 24.31% and 22.56%, reaching 23.93 GPa and 9.94 MPa·m1/2, respectively. The formation of the multilayer core–shell microstructure is the main reason for the improvement of the mechanical properties of the material.

Synthesis and characterization of Mn-based composite oxides with enhanced electrocatalytic activity for oxygen reduction

2014 ◽  
Vol 2 (33) ◽  
pp. 13345-13351 ◽  
Author(s):  
Yin Xu ◽  
Haochen Jiang ◽  
Xiaoxiao Li ◽  
Han Xiao ◽  
Wei Xiao ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Synthesis And Characterization ◽  
Core Shell ◽  
Shell Microstructure ◽  
Composite Oxides

Porous cubic spinel Mn1.5Co1.5O4 with onion-like core–shell microstructure were prepared, which showed enhanced electrocatalytic activity towards oxygen reduction.

PREPARATION AND MAGNETORHEOLOGICAL CHARACTERIZATION OF CI/PVB CORE/SHELL PARTICLE SUSPENDED MR FLUIDS

2007 ◽  
Vol 21 (28n29) ◽  
pp. 4996-5002 ◽  
Author(s):  
J. L. YOU ◽  
B. J. PARK ◽  
H. J. CHOI ◽  
S. B. CHOI ◽  
M. S. JHON
Keyword(s):  
Magnetic Particles ◽  
Mineral Oil ◽  
Core Shell ◽  
Shell Microstructure ◽  
Flow Properties ◽  
Mr Fluids ◽  
Coating Layers ◽  
Plate Geometry ◽  
Vinyl Butyral

Hybrid magnetic particles of carbonyl iron ( CI ) /poly(vinyl butyral) ( PVB ) with core/shell microstructure ( CI - PVB ) were prepared in order to enhance the dispersion stability of the magnetorheological (MR) fluids. Since the composite particles of CI - PVB have a lower density than that of the pristine CI particles, they are regarded to improve the sedimentation problem of magnetic particles in the MR fluid when the particles are dispersed in a mineral oil and to make easy redispersion after caking. The PVB coating layers were found to play an important role in the steric repulsion between the relatively large CI particles. Morphology and composition of the CI - PVB particles were observed via SEM and TGA, respectively. Flow properties of both CI and CI - PVB based MR fluids were examined via a rotational rheometer in parallel plate geometry equipped with a magnetic field supplier.

scholarly journals Characterization of Steel Slag Filler and Its Effect on Aging Resistance of Asphalt Mastic with Various Aging Methods

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 869
Author(s):  
Minghua Wei ◽  
Shaopeng Wu ◽  
Haiqin Xu ◽  
Hechuan Li ◽  
Chao Yang
Keyword(s):  
Particle Size ◽  
Surface Characterization ◽  
Steel Slag ◽  
Self Healing ◽  
Limestone Filler ◽  
Asphalt Mastic ◽  
Pore Characterization ◽  
Asphalt Mastics ◽  
Healing Property

Steel slag is the by-product of the steelmaking industry, the negative influences of which prompt more investigation into the recycling methods of steel slag. The purpose of this study is to characterize steel slag filler and study its feasibility of replacing limestone filler in asphalt concrete by evaluating the resistance of asphalt mastic under various aging methods. Firstly, steel slag filler, limestone filler, virgin asphalt, steel slag filler asphalt mastic and limestone filler asphalt mastic were prepared. Subsequently, particle size distribution, surface characterization and pore characterization of the fillers were evaluated. Finally, rheological property, self-healing property and chemical functional groups of the asphalt mastics with various aging methods were tested via dynamic shear rheometer and Fourier transform infrared spectrometer. The results show that there are similar particle size distributions, however, different surface characterization and pore characterization in the fillers. The analysis to asphalt mastics demonstrates how the addition of steel slag filler contributes to the resistance of asphalt mastic under the environment of acid and alkaline but is harmful under UV radiation especially. In addition, the pore structure in steel slag filler should be a potential explanation for the changing resistance of the asphalt mastics. In conclusion, steel slag filler is suggested to replace limestone filler under the environment of acid and alkaline, and environmental factor should be taken into consideration when steel slag filler is applied to replace natural fillers in asphalt mastic.

Preparation and properties of self-healing anticorrosive coating on methyl cellulose core-shell fibers

2021 ◽  
Vol 290 ◽  
pp. 129504
Author(s):  
Xiaohong Ji ◽  
Wei Wang ◽  
Xia Zhao ◽  
Binbin Zhang ◽  
Shibo Chen ◽  
...  
Keyword(s):  
Methyl Cellulose ◽  
Core Shell ◽  
Self Healing ◽  
Anticorrosive Coating

scholarly journals Structural and chemical characterization of MoO2/MoS2 triple-hybrid materials using electron microscopy in up to three dimensions

2021 ◽  
Author(s):  
Anna Frank ◽  
Thomas Gänsler ◽  
Stefan Hieke ◽  
Simon Fleischmann ◽  
Samantha Husmann ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Chemical Characterization ◽  
Three Dimensions ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Microscopy Investigation ◽  
Electron Microscopy Investigation ◽  
Carbon Nanotube Network ◽  
Core Shell Nanoparticles

This work presents the synthesis of MoO2/MoS2 core/shell nanoparticles within a carbon nanotube network and their detailed electron microscopy investigation in up to three dimensions. The triple-hybrid core/shell material was...

Sign in / Sign up

Export Citation Format

Share Document