Fabrication and Characterization of AgCoO2 Delafossite by Cation Exchange Process

2014 ◽  
Vol 602-603 ◽  
pp. 11-14
Author(s):  
Xiu Li Feng ◽  
Xiao Jiang Liu ◽  
Yong Qiang Yuan
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
Cation Exchange ◽  
Exchange Process ◽  
Single Particles ◽  
Effect Factors ◽  
Sem Images ◽  
Preparation Conditions ◽  
Fabrication And Characterization

A new method to synthesize AgCoO2 delafossite powder with AgNO3 and LiCoO2 by the cation exchange solid state reaction at an atmospheric press has been presented. The effect factors such as moral ratio Ag/Li, reaction time, reaction temperature on the production were discussed systematically and the optimized preparation conditions were obtained. The crystal structure of AgCoO2 from XRD is monoclinic. SEM images showed that AgCoO2 is sheet in shape,single particle size is about 100nm and many single particles swam to form irregular polygon agglomerates.

Low Temperature Fabrication and Characterization of Porous SiC Ceramics Using Polycarbosilane as Binder

2007 ◽  
Vol 336-338 ◽  
pp. 1090-1092 ◽  
Author(s):  
Qing Song Ma ◽  
Xiao Dong Yu
Keyword(s):  
Particle Size ◽  
Low Temperature ◽  
Fracture Surface ◽  
Flexural Strength ◽  
Sic Ceramics ◽  
Fabrication And Characterization ◽  
Porous Sic

Polycarbosilane (PCS) and SiC powders, in which PCS acted as binder, were adopted as starting materials to fabricate porous SiC ceramics. During pyrolysis, PCS experienced an organicinorganic transformation and bonded SiC powders at a low temperature of 1273K. The flexural strength of porous SiC ceramics increased with increasing PCS content and shaping pressure, while the porosity decreased with increasing the PCS content, shaping pressure and particle size of SiC powders. The fracture surface of porous SiC ceramics was observed.

Synthesis and Characterization of Li4Ti5O12 Doped by Na and Al as Anodes Material for Li-Ion Batteries

2015 ◽  
Vol 1112 ◽  
pp. 241-244 ◽  
Author(s):  
Slamet Priyono ◽  
Bambang Prihandoko ◽  
Anne Zulfia Syahrial
Keyword(s):  
Particle Size ◽  
Electrochemical Performance ◽  
Li Ion Batteries ◽  
Sem Images ◽  
Uniform Size ◽  
Undoped Material ◽  
Three Phase ◽  
Polyhedral Shape ◽  
Li Ion

Li4Ti5O12 pure and Li4Ti5O12 with Na and Al doped Li(3-x/3)AlxNaTi(5-2x/3)O12 (x=0, 0.025, 0.05, 0.075) as anodes for Li-ion batteries are synthesized at 850°C via solid state reaction using Li2CO3, TiO2-anatase, Al2O3 and Na2CO3 as precursor. The effect of substitution of Al and Na in Li4Ti5O12 on characterization of precursor and electrochemical performance is studied. It is found that Na doped in Li4Ti5O12 pure affected the formation of three phase i.e NaLiTi3O7, Li4Ti5O12, dan Li2TiO3. Meanwhile, Al doped contributed to the formation of NaLiTi3O7 phase significantly. The SEM images show that the particles have polyhedral shape with uniform size distribution. Na doped in the Li4Ti5O12 affected particle size become larger against Al doped particle size become smaller than undoped material, the best particle size measured by PSA is 30,89 . All characterization of material will determine the electrochemical performance of Li-ion battery.

Fabrication and Characterization of Particle Board from Coffee Husk Waste

2019 ◽  
Vol 891 ◽  
pp. 111-116 ◽  
Author(s):  
Nisakorn Nuamsrinuan ◽  
Patcharin Naemchanthara ◽  
Pichet Limsuwan ◽  
Kittisakchai Naemchanthara
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Wood Particle ◽  
Milling Process ◽  
Particle Board ◽  
Weight Percentage ◽  
Coffee Husk ◽  
Mechanical Properties Testing ◽  
Fabrication And Characterization

The purpose of this research was to fabricate the particle board from the coffee husk. The coffee husk from Chumphon province of Thailand was collected, prepared and separated into four groups such as outer husk, inner husk, the mixture of inner and outer husk and husk from the milling process. The coffee husk particle sheet was formed by the compression molding with the heater. Then the coffee husk particle sheets were the mechanical properties testing. The results showed the coffee husk particle sheet from milling process pass the Thai industrial standard (TIS.876/2547). However, the results of swelling and water absorption indicated that all the coffee husk sheet were not passed the TIS.876/2547. The effect of coffee husk particle size on mechanical properties was clarified. The coffee husk particle sheet from the particle size of 2, 4 and 6 mm was mechanical testing and follow TIS.876/2547. The coffee particle size of 2 mm showed the passing the standard. Moreover, the effect of isocyanate adhesive on mechanical properties was investigated. The weight percentage range of isocyanate adhesive on coffee husk from 7 to 13 %wt was carried out. The weight percentage of 9, 11 and 13 showed according to TIS.876/2547. From the experiment indicated that the coffee husk could be applied to the wood particle board industrial.

Preparation and Electrochemical Characterization of LiCoO2 Single Crystal Particles prepared by Super Critical Water Synthesis (SCWS)

1999 ◽  
Vol 575 ◽  
Author(s):  
Kiyoshi Kanamura ◽  
Takao Umegaki ◽  
Katsunori Toyoshima ◽  
Ken-ichi Okada ◽  
Yukiya Hakuta ◽  
...  
Keyword(s):  
Particle Size ◽  
Single Crystal ◽  
Discharge Capacity ◽  
Standard Method ◽  
Electrochemical Characterization ◽  
Electrochemical Methods ◽  
Structural Defects ◽  
Amorphous Phases ◽  
Preparation Conditions

ABSTRACTLiCoO2 single crystal particles were obtained by super critical water synthesis (SCWS) under optimized preparation conditions. The particle size of the LiCoO2 was less than 1 μm, which was much smaller than that of LiCoO2 prepared by a standard method. However, some unknown crystalline and amorphous phases coexisted with the well defined LiCoO2 single crystal particles. The discharge and charge characteristics of the LiCoO2 prepared by the SCWS were examined by some electrochemical methods. In the first cycle, an irreversible behavior was observed, and then the gradual decrease of the discharge capacity with discharge and charge cycle was also detected. The stable discharge capacity was estimated to be 80 mA h g−1 after the 100th cycle. This result may be due to the existence of amorphous phases and some structural defects.

scholarly journals Fabrication and characterization of composite materials based on porous ceramic preform infiltrated by elastomer

2015 ◽  
Vol 63 (1) ◽  
pp. 193-199 ◽  
Author(s):  
P. Chabera ◽  
A. Boczkowska ◽  
A. Witek ◽  
A. Oziębło
Keyword(s):  
Volume Fraction ◽  
Split Hopkinson Pressure Bar ◽  
Porous Ceramic ◽  
Strain Curve ◽  
Sem Images ◽  
Static Compression ◽  
Pressure Infiltration ◽  
Fabrication And Characterization ◽  
Elastomer Composites

Abstract The paper presents the experimental results of fabrication and characterization of ceramic- elastomer composites. They were obtained using pressure infiltration of porous ceramics by elastomer As a result the composites in which two phases are interpenetrating three-dimensionally and topologically throughout the microstructure were obtained. In order to enhance mechanical properties of preforms a high isostatic pressure method was utilized. The obtained ceramic preforms with porosity gradient within the range of 20-40% as well as composites were characterized by X-ray tomography. The effect of volume fraction of pores on residual porosity of composites was examined. These results are in accordance with SEM images which show the microstructure of composites without any delaminations and voids. Such composites exhibit a high initial strength with the ability to sustain large deformations due to combining the ceramic stiffness and rubbery elasticity of elastomer. Static compression tests for the obtained composites were carried out and the energy dissipated during compression was calculated as the area under the stress-strain curve. The dynamic behavior of the composite was investigated using the split Hopkinson pressure bar technique. It was found that ceramic-elastomer composites effectively dissipate the energy. Moreover, a ballistic test was carried out using armor piercing bullets.

Preparation and Characterization of Ethyl Cellulose-Based Microcapsules Containing Argy Wormwood Solution

2013 ◽  
Vol 448-453 ◽  
pp. 98-101
Author(s):  
Ping Jiang ◽  
Du Xin Li ◽  
Yue Jun Liu
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Ethyl Cellulose ◽  
Chemical Structure ◽  
Controlled Delivery ◽  
Core Shell ◽  
Sem Images ◽  
Optical Micrograph ◽  
Spherical Structures

The biodegradable microcapsules based ethyl cellulose (EC) for a controlled delivery of Argy Wormwood solution (AWS) were prepared by emulsionsolvent evaporation method using ethyl acetate as solvent. This study examined the effect of the ratios of core to shell on the size of microcapsules. SEM images of microcapsules showed uniform spherical structures with smooth surfaces with a particle size distribution of 100nm2μm. Core-shell, hetero-structures were confirmed using optical micrograph. The chemical structure of the microcapsules was determined by FTIR.

Fabrication and Characterization of Composite Microspheres Containing Carbonated Hydroxyapatite Nanoparticles

2007 ◽  
Vol 334-335 ◽  
pp. 1221-1224 ◽  
Author(s):  
Wen You Zhou ◽  
Min Wang ◽  
W.L. Cheung
Keyword(s):  
Hydroxyapatite Nanoparticles ◽  
Tissue Engineering Scaffolds ◽  
Sem Images ◽  
Carbonated Hydroxyapatite ◽  
Suitable Material ◽  
Composite Microspheres ◽  
Evaporation Technique ◽  
Nanoparticle Content ◽  
Fabrication And Characterization

Nano-sized carbonated hydroxyapatite (CHAp) particles were firstly synthesized using a nanoemulsion method. TEM analyses revealed that as-synthesized nanoparticles were calcium-deficient and spherical in shape (diameter: 16.8±2.6nm). Biocomposite microspheres comprising CHAp nanoparticles and poly(L-lactide) (PLLA) were fabricated using the single emulsion solvent evaporation technique. SEM images showed that composite microspheres were mainly 5-30 μm in size despite the change of CHAp nanoparticle content. When the CHAp nanoparticle content in composite microspheres was below 10 wt%, all nanoparticles were encapsulated within the microspheres which possessed a nanocomposite structure. DSC results showed that the crystallinity of the PLLA matrix of microspheres increased from 38 to 42% when the CHAp nanoparticle content was increased from 0 to 20 wt%. The biocomposite microspheres should be a suitable material for constructing bone tissue engineering scaffolds.

Stability and particle size of polypyrrole dispersion using sodium dodecylbenzenesulfonate as surfactant

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Shuangxi Xing ◽  
Guoku Zhao
Keyword(s):  
Particle Size ◽  
Driving Forces ◽  
Average Particle Size ◽  
Average Particle ◽  
Sem Images ◽  
Sodium Dodecylbenzenesulfonate ◽  
Structure And Morphology ◽  
Preparation Conditions ◽  
Pyrrole Monomer ◽  
The Stability

AbstractPolypyrrole (PPy) dispersion was prepared using FeCl3·6H2O as oxidant in the presence of sodium dodecylbenzenesulfonate (SDBS) as surfactant. The formation of the micelles and the electrostatic interaction between PPy and SDBS were considered the driving forces for the formation and stability of the dispersion. UV/Vis/NIR, FTIR spectra and SEM images were studied to confirm the structure and morphology of the PPy dispersion, respectively. Polymerization of pyrrole under different preparation conditions including the concentration of the surfactant, the pyrrole monomer and the oxidant and also the addition of acid were carried out in order to investigate their effects on the stability and average particle size of the dispersions. The conductivity of the resulting PPy particles was measured and a comparison between the PPy and polyaniline dispersion formed with SDBS as surfactant was also given.

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