Study on Formation Mechanism by Monitoring the Morphology and Structure Evolution of Nearly Monodispersed Fe3O4Submicroparticles with Controlled Particle Sizes

2011 ◽  
Vol 50 (15) ◽  
pp. 9009-9018 ◽  
Author(s):  
Ting Fan ◽  
Dengke Pan ◽  
Hui Zhang
Keyword(s):  
Formation Mechanism ◽  
Structure Evolution ◽  
Particle Sizes ◽  
Morphology And Structure

Observation of Morphology and Structure Evolution during Gelation of a Bis(Anhydrazide) Derivative

2017 ◽  
Vol 121 (37) ◽  
pp. 8795-8801 ◽  
Author(s):  
Wei Li ◽  
Xiangyang Che ◽  
Fangyi Chen ◽  
Chunxue Zhang ◽  
Tianren Zhang ◽  
...  
Keyword(s):  
Structure Evolution ◽  
Morphology And Structure

Assembly, formation mechanism, and enhanced gas-sensing properties of porous and hierarchical SnO2 hollow nanostructures

2010 ◽  
Vol 25 (10) ◽  
pp. 1992-2000 ◽  
Author(s):  
Jinyun Liu ◽  
Fanli Meng ◽  
Yu Zhong ◽  
Jinhuai Liu ◽  
Guangyu Chen ◽  
...  
Keyword(s):  
Formation Mechanism ◽  
Gas Sensing ◽  
Sodium Dodecyl ◽  
Sensing Properties ◽  
Factors Influencing ◽  
Hollow Nanostructures ◽  
Gas Sensing Properties ◽  
Morphology And Structure ◽  
Surfactant Assisted ◽  
Soft Templates

Hierarchical and hollow SnS2 nanostructures as precursors were fabricated via a surfactant-assisted assembly process using sodium dodecyl sulfate as soft templates. The as-prepared SnS2 nanostructures were further oxidized to form porous SnO2 conversion for investigating their gas-sensing properties in drug-precursor detection. On the basis of a series of time- and ratio-dependent reactions, a formation mechanism of the special nanostructures and factors influencing morphology and structure were determined. Gas-sensing measurements revealed that the porous and hierarchical SnO2 hollow nanostructures were sensitive to drug precursors, indicating promising applications in environmental monitoring and public safety investigation. In addition, we found that the assembled SnO2 nanomaterials possessed significantly enhanced gas-sensing properties compared with unassembled SnO2 with a solid interior.

Controlled Hydrothermal Growth of CuO-Based Nanostructures from Copper Alginate

2011 ◽  
Vol 688 ◽  
pp. 19-22 ◽  
Author(s):  
Bing Bing Wang ◽  
Qing Shan Kong ◽  
Jian Ping Sun ◽  
Quan Feng Yu ◽  
Quan Ji ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Growth Mechanism ◽  
Hydrothermal System ◽  
Ph Value ◽  
Structure Evolution ◽  
Structure Directing Agent ◽  
Aggregation State ◽  
Air Atmosphere ◽  
Morphology And Structure ◽  
Different Temperatures

Schistose and aciculate CuO nanostructures have been synthesized by a novel ammonia assisted hydrothermal method of copper alginate. The conversion processes of copper alginate are investigated by thermogravimetrics (TG) analyses under N2and air atmosphere. The morphology, structure, and composition of the obtained CuO are investigated using SEM,TEM and XRD. It is found that different temperature and pH value resulted in the morphology and structure evolution of CuO. Ammonia was used as structure-directing agent in the hydrothermal system. The aggregation state of the nanostructures was controlled by the temperature. Dispersive schistose structures about 1μm in diameter were synthesized with 0.5mL ammonia at different temperatures. Dispersive microspheres of about 4 μm in diameter were also synthesized with 1 mL ammonia. Microspheres composed of nanoneedles and nanoplates were synthesized at 120°C and 160°C, respectively. Moreover, a possible growth mechanism governing the formation of such a nanomicrostructure was primarily discussed.

Morphology and structure evolution of flaky char particles during CO 2 gasification

2018 ◽  
Vol 46 (7) ◽  
pp. 787-795
Author(s):  
De-xi MENG ◽  
Ke-yi ZHANG ◽  
Hao-yu DU ◽  
Jian-liang XU ◽  
Xue-li CHEN
Keyword(s):  
Structure Evolution ◽  
Morphology And Structure

Growth and formation mechanism of shape-selective preparation of ZnO structures: correlation of structural, vibrational and optical properties

2020 ◽  
Vol 22 (14) ◽  
pp. 7329-7339 ◽  
Author(s):  
M. Montero-Muñoz ◽  
J. E. Ramos-Ibarra ◽  
J. E. Rodríguez-Páez ◽  
G. E. Marques ◽  
M. D. Teodoro ◽  
...  
Keyword(s):  
Optical Properties ◽  
Formation Mechanism ◽  
Preparation Method ◽  
Particle Sizes ◽  
Surface Areas ◽  
Shape Selective ◽  
Distinct Particle

A shape-selective preparation method was used to obtain highly crystalline rod-, needle-, nut-, and doughnut-like ZnO morphologies with distinct particle sizes and surface areas.

Preparation of Nano-Porous Zn and Nanowire-Like ZnO by Anodization and Oxidation

2012 ◽  
Vol 550-553 ◽  
pp. 1985-1990
Author(s):  
Ze Bao Rui ◽  
Ben Wu ◽  
Hong Bing Ji
Keyword(s):  
Salicylic Acid ◽  
Formation Mechanism ◽  
Electrolyte Concentration ◽  
Formation Rate ◽  
Zno Nanowires ◽  
Morphology And Structure

Anodization of Zn foil in a salicylic acid-ethanol-H2O electrolyte and the following annealing of the anodized product have been investigated in this paper. Nano-porous metallic Zn were fabricated by anodization, and the Zn nano-pores formation mechanism on the zinc foil was suggested. The diameter of the Zn nano-pores is around 200 nm. Both the electrolyte concentration and potential have significant effect on the morphology and structure of the pores, and the nano-pores formation rate. Nanowire-like ZnO was produced by annealing the nano-porous metallic Zn obtained by anodization. The lengths of the ZnO nanowires range from 2 to 5 μm, and the diameters are in the range of 40~70 nm.

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