scholarly journals Fabrication and characterization of Ni-decorated h-BN powders with ChCl-EG ionic liquid as addition by electroless deposition

2018 ◽  
Vol 5 (5) ◽  
pp. 180146
Author(s):  
Qionglian Yang ◽  
Juanjian Ru ◽  
Peng Song ◽  
Mingyu Hu ◽  
Jing Feng
Keyword(s):  
Ionic Liquid ◽  
Electron Microscope ◽  
Electroless Plating ◽  
Choline Chloride ◽  
Nickel Particle ◽  
Additive Concentration ◽  
Plating Bath ◽  
Transmission Electron ◽  
Average Size ◽  
Surface Morphologies

Ni-decorated h-BN powders are fabricated with ChCl-EG as additive via electroless plating in the paper. As comparison, the different additive concentration of choline chloride-ethylene glycol (ChCl-EG) ionic liquid (0 g l −1 , 30 g l −1 , 60 g l −1 , 90 g l −1 ) is presented. The effects of ChCl-EG concentration are studied, including the surface morphologies, phase analysis of Ni-decorated h-BN powders and the residual Ni 2+ concentration is measured in electroless plating bath. It is demonstrated that the deposition phenomena of nickel particles on h-BN surface is changed with the addition of ChCl-EG. When the concentration of ChCl-EG is 30 g l −1 , the Ni particles on h-BN surface are in dispersed and spheroid state with the average size of 10–1000 nm. It can be found that 30 g l −1 ChCl-EG is conducive to the arise of deposition phenomena, which is the formation of the single nickel particle on h-BN surface. Besides, more Ni particles are deposited on h-BN surface with the increase of nickel plating times, which is characterized with scanning electron microscope and transmission electron microscope. Furthermore, the deposition phenomenon and growth mechanism are proposed without and with ChCl-EG as additive to further elaborate the formation of Ni particles on h-BN surface.

Preparation and Tribological Properties of Surface-Coated Nano-Copper Additives

2008 ◽  
Vol 373-374 ◽  
pp. 580-584 ◽  
Author(s):  
Yi Xu ◽  
He Long Yu ◽  
Bin Shi Xu ◽  
Xiao Li Wang ◽  
Qian Liu
Keyword(s):  
Electron Microscope ◽  
Tribological Properties ◽  
Protective Film ◽  
Cu Nanoparticles ◽  
Transmission Electron ◽  
Load Carrying ◽  
Modification Technique ◽  
Average Size ◽  
Worn Surface ◽  
Worn Surfaces

In the present work, surface-coated Cu nanoparticles with FCC structure and an average size of 40 nm were prepared by reducing reaction and surface modification technique. The morphology and phase structure of the nano-copper were characterized by transmission electron microscope (TEM). The ball-on-disc tester and ring-on-block tester were performed to study the tribological properties of surface-coated Cu nanoparticles as oil additive. The tests were carried out under the lubrication of 50CC oil alone and oil containing surface-coated nano-copper additives. The morphologies and elementary distributions of the worn surfaces were analyzed by scanning electron microscope (SEM) and energy dispersive spectrometry (EDS), respectively. Results indicate that surface-coated nano-copper additives can significantly improve the wear resistance and load-carrying abilities of 50CC oil, as well as reduce friction coefficient. A soft copper protective film is formed on the worn surface lubricated with oil containing nano-copper additives, which separates the worn surfaces, avoids their direct contact and reduces friction and adhesive wear. Besides, the grooves and small valleys on the worn surfaces are found to be partly filled and repaired by nano-copper, as makes the worn surface repaired and smoother.

Preparation of Nanosized TiO2 Synthesized by Sol-Gel Pathway Using Ionic Liquid as Assistant and its Photocatalytic Activities

2012 ◽  
Vol 535-537 ◽  
pp. 2240-2244
Author(s):  
Wei Wei ◽  
Chang Shun Yu ◽  
Shao Jun Wang ◽  
Qing Da An
Keyword(s):  
Ionic Liquid ◽  
Diffuse Reflectance ◽  
Sol Gel ◽  
Rutile Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Photocatalytic Activities ◽  
Average Size ◽  
Nanosized Tio2

Nanosized TiO2 particles were synthesized by sol-gel method using ionic liquid as assistant. The samples were characterized by UV-vis diffuse reflectance spectra, X-ray diffraction (XRD), transmission electron microscopy (TEM). It was shown that the phase detectable was mainly rutile phase with uniform sphericity and the average size was 10nm. Along with the rise of sintering temperature, grain diameter became bigger. The photocatalytic activities of nanosized TiO2 were evaluated by the reduction yield in the presence of CO2 and water. The result showed that TiO2 catalysts has efficient photocatalytic activities, of which made with [OMIM]BF4 displayed the highest photocatalytic active in the experiment.

Microstructure and Erosion Behavior at Elevated Temperature of Thermal Sprayed Fe-Al/WC Coating

2010 ◽  
Vol 105-106 ◽  
pp. 455-458
Author(s):  
Bao Hong Tian ◽  
Yong Liu
Keyword(s):  
Electron Microscope ◽  
Elevated Temperature ◽  
Incidence Angle ◽  
Arc Spraying ◽  
Image Analyzer ◽  
Cored Wire ◽  
Erosion Behavior ◽  
Transmission Electron ◽  
Coating Microstructure ◽  
Surface Morphologies

A Fe-Al/WC composite coating was fabricated by using high velocity arc spraying (HVAS) and cored wire. The elevated temperature erosion behaviors of the coating were investigated with a grit blasting type erosion tester. The coating microstructure and eroded surface morphologies were analyzed by energy dispersion spectroscope (EDS), X-ray diffraction (XRD), scanning electron microscope (SEM) , transmission electron microscope (TEM) and image analyzer. The effects of incidence angle and test temperature on the erosion behavior were determined.

Ionic Liquid – Assisted Synthesis and Characterization of Cerium Oxide Nanocubes for Degradation of Methylene Blue

2014 ◽  
Vol 625 ◽  
pp. 164-167
Author(s):  
Mohd Aliff Irham Md. Azhar ◽  
Sujan Chowdhury ◽  
Pradip Chandra Mandal ◽  
Muhd Fahmi Daman ◽  
Sekhar Bhattacharjee ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Ionic Liquid ◽  
Cerium Oxide ◽  
Treatment Method ◽  
Acetate Anion ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Different Types ◽  
Average Size

Cerium Oxide (CeO2) nanocubes are synthesized by using hydrothermal treatment method in the presence of four different types of ionic liquid such as acetate anion, phosphate anion, and dicyanamide anion. Ceria nanocubes has been consisted with average size of 16 to 31 nm in diameter and characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), and surface analyzer and porosimetry analysis (ASAP). Ceria nanocubes have higher photocatalytical ability in the degradation of methylene blue as compared to commercial ceria nanoparticles which are confirmed through ultraviolet-visible spectroscopy (UV/Vis).

Synthesis of one-dimensional structured metal phthalocyanine in an ionic liquid

2007 ◽  
Vol 11 (10) ◽  
pp. 713-718 ◽  
Author(s):  
David S. Jacob ◽  
Somashekarappa Mallenahalli ◽  
Aharon Gedanken ◽  
Leonid A. Solovyov ◽  
Evangelia Xenogiannopoulou ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Electron Microscope ◽  
High Resolution ◽  
High Yield ◽  
Metal Phthalocyanine ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
X Ray ◽  
Nickel Phthalocyanine ◽  
Transmission Electron

Nickel phthalocyanine is synthesized in an ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate) giving a high yield of one-dimensional structures. The morphology of the synthesized material is detected by a high-resolution scanning electron microscope, a high-resolution transmission electron microscope, characterized by powder X-ray diffraction, and a CHN analyzer. The nonlinear optical properties of the synthesized phthalocyanine are also investigated.

scholarly journals Micro/Mesoporous Fe3O4/Fe-Phthalocyanine Microspheres and Effects of Their Surface Morphology on the Crystallization and Properties of Poly(Arylene Ether Nitrile) Composites

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1356 ◽  
Author(s):  
Kui Li ◽  
Dengxun Ren ◽  
Xianzhong Tang ◽  
Mingzhen Xu ◽  
Xiaobo Liu
Keyword(s):  
Electron Microscope ◽  
Surface Morphology ◽  
Composite Films ◽  
Surface Characteristics ◽  
Excellent Thermal Stability ◽  
Arylene Ether ◽  
Transmission Electron ◽  
Interfacial Compatibility ◽  
Surface Morphologies ◽  
Mesoporous Structures

The surface morphology of nanoparticles significantly affects the final properties and interfacial characteristics of their composites. Thus, investigations on the surface morphology of the nanoparticles is essential to fabricate improved nanoparticle-reinforced composites. Fe3O4/Fe-phthalocyanine (FePc) hybrid microspheres with micro/mesoporous structures were prepared via a solvothermal process and solvent etching method. The surface morphology and compositional distribution were respectively investigated using a scanning electron microscope (SEM) and a transmission electron microscope (TEM) to rule out that FePc monomers have been blended with Fe3O4 to form Fe3O4/FePc hybrid microspheres without serious agglomeration. The surface roughness of Fe3O4/FePc microspheres was investigated by the scanning probe microscope (SPM), and confirmed by the adsorption and desorption isotherms of N2. The effects of the various surface morphologies on the crystallization behavior of crystallizable poly(arylene ether nitrile) (c-PEN) were first employed to confirm the surface characteristics of the resulted microspheres. Results indicated that the etched Fe3O4/FePc microspheres would improve the crystallization degree of c-PEN, due to their much more micro/mesoporous structures than that of original Fe3O4/FePc. Then, Fe3O4/FePc hybrid microspheres reinforced PEN composite films were prepared and their interfacial compatibility was monitored using an SEM. Excellent thermal stability and improved mechanical properties were obtained by combining the etched Fe3O4/FePc and PEN matrix. The excellent surface properties and micro/mesoporous structures make the novel Fe3O4/FePc an excellent candidate of organic/inorganic hybrid fillers and micro/mesoporous materials.

scholarly journals Synthesis of BaTiO3 Nanoparticles via Hydrothermal Method

2017 ◽  
Vol 268 ◽  
pp. 172-176 ◽  
Author(s):  
Nurul Norfarina Hasbullah ◽  
Oon Jew Lee ◽  
Josephine Liew Ying Chyi ◽  
Soo Kien Chen ◽  
Zainal Abidin Talib
Keyword(s):  
Electron Microscope ◽  
Hydrothermal Method ◽  
Transmission Electron Microscope ◽  
Hydrothermal Process ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Transmission Electron ◽  
Average Size ◽  
Tga And Dsc

In this work, BaTiO3 nanoparticles were synthesized through hydrothermal method. The powder obtained from the hydrothermal process (as-synthesized powder) was calcined at 1000 °C. The phase formation and morphology of the as-synthesized and calcined powders were studied using X-ray diffraction (XRD), thermogravimetric (TGA) and differential scanning calorimetry (DSC) analyzer, and transmission electron microscope (TEM). The XRD data showed that the as-synthesized powder is partially amorphous. Upon calcining the powder at 1000 °C, highly crystalline BaTiO3 with tetragonal structure was obtained. As shown by TGA and DSC analysis, the precursor powder was completely transformed into BaTiO3 at 1000 °C. The presence of BaCO3 as an impurity phase in the powder is due to the lack of Ba2+ / Ti3+/4+. Transmission electron microscope images showed that the particle size of the as-synthesized powder increased after calcination due to crystal growth. In addition, nanocubes with the average size of around 11.66 nm were obtained as a result of the calcination compared to the ellipsoid like particles of the as-synthesized powder.

MICROSTRUCTURE AND FRACTURE TOUGHNESS OF FeNiCr-TiC COMPOSITE PRODUCED BY THERMITE REACTION

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2904-2909
Author(s):  
WENJUN XI ◽  
CHAOLIANG SHI
Keyword(s):  
Fracture Toughness ◽  
Electron Microscope ◽  
Aging Temperature ◽  
Aging Treatment ◽  
Ferrite Matrix ◽  
Β Phase ◽  
Transmission Electron ◽  
The Matrix ◽  
Average Size ◽  
Effects Of Aging

The microstructures of the FeNiCr - TiC composite produced by the rapid solidification thermite process were investigated using X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The effects of aging treatment on the microstructure and fracture toughness of the composite were examined. Results showed that the FeNiCr - TiC composite was composed of ferrite (α- FeNiCr ), TiC and NiAl (β phase). TiC particles in the matrix were in the shape of polygon and uniformly distributed, and their size was less than 3 µm. The β phase was coherent with the ferrite matrix, and its average size was about 50 nm. The fracture toughness of composite was 22 MPa·m1/2 without aging. When the aging temperature was below 600°C, the fracture toughness of the composite had higher plateau values and reached the maximum of 32 MPa·m1/2 at aging temperature 500°C due to the precipitation of NiAl phase on the nanometer scale. The fracture toughness decreased rapidly aged at 650°C, and then kept homology value in the range of 700 to 900°C, which was attributed to the precipitation of needle-shaped carbide ( Cr / Fe )7 C 3 at the grain boundaries.

scholarly journals Interface Template Synthesis of Zein-Based Amorphous Tio2 Composite Microcapsules with Enhanced Photocatalysis

2021 ◽  
Author(s):  
Qunna Xu ◽  
Zhongxue Bai ◽  
Jianzhong Ma ◽  
Ruijie Qiu ◽  
Mengchen Huang ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Template Synthesis ◽  
Food Packaging ◽  
Hollow Structure ◽  
Transmission Electron ◽  
Catalytic Material ◽  
Amorphous Tio2 ◽  
Average Size ◽  
Structure And Microstructure ◽  
Energy Disperse Spectroscopy

Abstract In order to further enhance the application field of zein-based microcapsule. Zein-based amorphous TiO2 composite microcapsules (ZTCMs) were innovatively prepared from zein, tetra butyl ortho titanate (TBOT) and PEO106PPO70PEO106 (F127) via interface template synthesis. The Effects of TBOT amount on ZTCMs structures and photo-catalytic performances were mainly investigated. Chemical structure and microstructure of the obtained composite microcapsules were characterized mainly by fourier-transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), scanning electron microscope (SEM) and energy disperse spectroscopy (EDS). The results show ZTCMs exhibited evident hollow structure with titanium dioxide (TiO2) wrapped in the outer layer. The average size of ZTCMs300 was approximately 4 µm, which increased as the increase of TBOT dosage. Significantly, ZTCMs showed excellent photo-catalytic ability on dyes, red wine and coffee alike. The degradation rate of Rhodamine B (RB) was more than 80% after irradiation for 5 h under sunlight. This study provides a facile method to fabricate natural-based photo-catalytic material, which will be a good candidate in many fields such as medicine, food packaging, leather and textile.

Fabrication of Magnetic Cenosphere Deposited with Fe3O4 Nanoparticles by Hydrothermal Method

2013 ◽  
Vol 750-752 ◽  
pp. 2021-2025 ◽  
Author(s):  
Hui Zhang ◽  
Jie Yao Song ◽  
Jian Chao Zhan
Keyword(s):  
Electron Microscope ◽  
Spinel Phase ◽  
Gravimetric Analysis ◽  
Vibrating Sample Magnetometer ◽  
Hydrothermal Conditions ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Reaction Solution ◽  
Average Size ◽  
Thermal Stability Of

We prepared the magnetic cenospheres deposited with magnetite Fe3O4nanoparticles under hydrothermal conditions. The crystalline phase, magnetization properties, morphology, chemical composition and thermal stability of asobtained cenospheres are analyzed by Xray diffraction, vibrating sample magnetometer, scanning electron microscope, Xray energy dispersive spectroscope, transmission electron microscope, thermal gravimetric analysis and differential scanning calorimetry techniques. The results show that the inverse cubic spinel phase of Fe3O4nanoparticles with an average size 50 nm are synthesized, and synchronously deposited on cenosphere surface. As the thickness of Fe3O4coating increases, the saturation magnetization increases to some extent. The growth of Fe3O4nanoparticles can be controlled by adding ethanol to the reaction solution.

Sign in / Sign up

Export Citation Format

Share Document