Preparation and Characterization of Integral Hollow Microspheres of Nickel Hydroxide and Nickel Oxide

2007 ◽  
Vol 121-123 ◽  
pp. 187-190 ◽  
Author(s):  
Xiao Feng Wu ◽  
Yun Fa Chen ◽  
Qun Yan Li ◽  
L.Q. Wei
Keyword(s):  
Nickel Oxide ◽  
Nickel Hydroxide ◽  
Hollow Spheres ◽  
Hollow Microspheres ◽  
Nickel Nitrate ◽  
Composite Particles ◽  
Nickel Salt ◽  
Core Method ◽  
Hydrolysis Of

Hollow microspheres of nickel hydroxide and nickel oxide were prepared with as-synthesized PS/Ni(OH)2 composite particles by sacrificing core method, respectively. The composite particles were synthesized by deposition of the Ni(OH)2 nanoflakelets formed by the hydrolysis of nickel nitrate onto the surfaces of polystyrene (PS) particles. The effects of different concentrations of nickel salt and urea on the deposition of the nanoflakelets of nickel hydroxide were studied. It was found that the uniform nanoflakelets were deposited on the polystyrene particles under the conditions of the 4╳10-3 M nickel salt and 0.667M urea. Compared with the directly calcinating of composite particles, Integral hollow microspheres of nickel hydroxide were attained by removal of cores of polystyrene in composite particles with toluene and NiO hollow microspheres by calcinating of these Ni(OH)2 hollow spheres in oven at 600°C for 2h.

scholarly journals Preparation and Characterization of Magnetic Chitosan Microcapsules

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaopeng Xiong ◽  
Yong Wang ◽  
Weiwei Zou ◽  
Jiangjiang Duan ◽  
Yun Chen
Keyword(s):  
Magnetic Properties ◽  
Strong Interaction ◽  
Liquid Paraffin ◽  
Hollow Microspheres ◽  
Composite Particles ◽  
Cross Link ◽  
Magnetic Chitosan ◽  
Starting Solution ◽  
Dense Shell

By dispersing aqueous precipitant in liquid paraffin to prepare a W/O emulsion then adding chitosan (CS) solution, CS microcapsules have been successfully prepared. It is a facile way to prepare polymer microcapsules by using aqueous precipitant or nonsolvent as template, which avoids the removal of template and would free from the necessity to cross-link the microcapsule as usual methods to directly form dense shell. The hollow feature of the obtained materials is revealed. The diameter of the microcapsules ranges from severalμm to over 100 μm. Magnetic CS microcapsules have been prepared in this way when Fe3+and Fe2+were mixed with CS to prepare a mixture starting solution. The appearance and microstructure of the composite microcapsules were studied. The results indicate that the formed Fe3O4nanoparticles are embedded in the CS matrix evenly due to strong interaction between the Fe3O4nanoparticles and the CS molecules. The Fe3O4content and the magnetic properties of the composite microcapsule were measured. The composite microcapsules were calcined in air at 700°C to prepare pure inorganic hollow microspheres. It is general to prepare hollow polymeric or composite particles by using this method.

Fabrication and Characterization of ZrO2 Hollow Spheres

2012 ◽  
Vol 512-515 ◽  
pp. 253-256
Author(s):  
Kai Liu ◽  
Sa Li ◽  
Chang An Wang
Keyword(s):  
Zirconium Dioxide ◽  
Hollow Spheres ◽  
Hollow Microspheres ◽  
Formation Mechanisms ◽  
Thermal Decomposition Process ◽  
The Core ◽  
Eds Analysis ◽  
Fabrication And Characterization ◽  
Wrapping Technique

Zirconium dioxide hollow microspheres were prepared using carbonaceous polysaccharide microspheres as a template through a heterogeneously nucleating wrapping technique. Firstly, carbonaceous microspheres wrapped by ZrO2 were synthesized, and then the obtained precursor was calcinated at 800°C for 2 hours to remove the template. Based on SEM, TEM and EDS analysis, the microstructure, composition and thermal decomposition process of the precursor as well as the final products were investigated. The formation mechanisms of the core-shell structure precursor and the hollow microspheres were also discussed.

Preparation and characterization of nanoplatelets of nickel hydroxide and nickel oxide

2006 ◽  
Vol 98 (2-3) ◽  
pp. 267-272 ◽  
Author(s):  
Gen-Tao Zhou ◽  
Qi-Zhi Yao ◽  
Xinchen Wang ◽  
Jimmy C. Yu
Keyword(s):  
Nickel Oxide ◽  
Nickel Hydroxide

Self-Assembly and Characterization of TiO2/PS Complex Particle and TiO2 Hollow Spheres

2011 ◽  
Vol 197-198 ◽  
pp. 136-139
Author(s):  
Fan Xiao ◽  
Wei Li ◽  
Zhi Xian Zhang ◽  
Fei Gao
Keyword(s):  
Self Assembly ◽  
Ph Value ◽  
Hollow Spheres ◽  
Layer By Layer ◽  
X Ray Diffraction ◽  
Complex Particle ◽  
Assembly Technique ◽  
Synthesized Materials ◽  
Hydrolysis Of

Using TiO2 particles obtained by hydrolysis of titanium oxysulfate as the precursor, polystyrene (PS) microspheres as the template, TiO2/PS complex particles were successfully deposited on Ti substrates through layer-by-layer self-assembly technique and the surfactant-assisted process at low temperature. Then removed PS spheres by two methods, TiO2 hollow spheres were attained. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were employed to characterize the synthesized materials. The results showed that the crystallization, structure and surface morphology of TiO2/PS on the surface have a great relationship with the pH value of treating solution. Diversity effects on surface integrity and bioactive of hollow spheres happened due to different ways of removing PS core.

Preparation and Characterization of Raspberry-Like TiO2/Cu Composite Particles

2008 ◽  
Vol 368-372 ◽  
pp. 1480-1482 ◽  
Author(s):  
Jun Yan ◽  
Hai Ping Cui ◽  
Shi Guo Du ◽  
Bin Wang
Keyword(s):  
Ambient Pressure ◽  
Pure Copper ◽  
Particle Surface ◽  
Composite Particles ◽  
Acidic Aqueous Solution ◽  
Micron Size ◽  
Dta Analysis ◽  
Factor Design ◽  
Hydrolysis Of

Raspberry-like TiO2/Cu composite particles were prepared under mild conditions (75°C and ambient pressure) by hydrolysis of Ti(OBu)4 in acidic aqueous solution and subsequent reflux in the presence of micron size Cu powders. A 3-level and 4-factor design was employed to evaluate the effect of the main parameters on the coating quality. TiO2 particles of approximate 100nm in size were found coating on the surfaces of Cu powders to form raspberry-like structure. Ti and Cu element mainly existed on the composite particle surface as the chemical state of Ti4+ and Cu2+. TG-DTA analysis showed the TiO2 coating increased the thermal stability of Cu particles. The composite particles began oxidizing at 400°C while pure copper particles oxidized at 200°C.

Developing a New Method for the Formation of NiO Hollow Microspheres Using Yeasts as Bio-Templates

2009 ◽  
Vol 79-82 ◽  
pp. 1867-1870
Author(s):  
Li Yang ◽  
Wie Sheng Guan ◽  
Bo Bai ◽  
Yun Xiang
Keyword(s):  
Nickel Oxide ◽  
Formation Mechanism ◽  
Nickel Hydroxide ◽  
Hollow Microspheres ◽  
New Method ◽  
Yeast Cells ◽  
Typical Process

A novel route for synthesis of biomorphic nickel oxide （NiO） hollow microspheres, using yeasts as bio-templates, has been successfully developed. In the typical process，yeast cells were first coated with nickel hydroxide and then calcinated to obtain nickel oxide hollow microspheres. As-prepared products were characterized by DTA, SEM, XRD and FTIR. A possible formation mechanism of NiO hollow microspheres was proposed in brief.

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