scholarly journals Production of Nimn2o4 Hollow Spheres and Cofe2o4 Bowl-Like Structures by Using Block Copolymer Stabilized Polystyrene Spheres as a Hard Template

2021 ◽  
Author(s):  
Gökhan Kocak ◽  
Vural Bütün
Keyword(s):  
Metal Oxide ◽  
Tertiary Amine ◽  
Diblock Copolymer ◽  
Hollow Spheres ◽  
Polystyrene Spheres ◽  
Hard Template ◽  
Sem Images ◽  
Nickel Manganese ◽  
Controlled Precipitation ◽  
Successful Production

Abstract The aim of this study is to highlight the use of polystyrene (PS) latexes stabilized with block copolymers as a hard template in the production of metal oxide hollow spheres. PS latexes produced by dispersion polymerization by stabilizing with tertiary amine methacrylate-based diblock copolymer were used as a hard template in the preparation of nickel manganese oxide (NiMn2O4) hollow spheres and iron cobalt oxide (CoFe2O4) bowl-like structures. Thanks to the diblock copolymer stabilizer with tertiary amine functional groups on the PS surface, precursor salts of CoFe2O4 and NiMn2O4 were first homogeneously deposited on the surface of PS latexes with a controlled precipitation technique. Then, metal oxide hollow spheres and bowl-like structures were produced by calcination. XRD results showed that CoFe2O4 and NiMn2O4 structures were successfully obtained after calcination. The thermogravimetric analysis results showed that the CoFe2O4 and NiMn2O4 contents of the hybrid PS spheres were in the range of 26.0-28.6 wt%. SEM images showed that the inorganic-polymer spheres fused with each other after calcination to form larger magnetic CoFe2O4 bowl-like structures. SEM images also indicated successful production of highly rough NiMn2O4 hollow spheres with nano-sheets on the surface.

Nickel enrichment of next-generation NMC nanomaterials alters material stability, causing unexpected dissolution behavior and observed toxicity to S. oneidensis MR-1 and D. magna

2020 ◽  
Vol 7 (2) ◽  
pp. 571-587 ◽  
Author(s):  
Joseph T. Buchman ◽  
Evan A. Bennett ◽  
Chenyu Wang ◽  
Ali Abbaspour Tamijani ◽  
Joseph W. Bennett ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Cobalt Oxide ◽  
Dissolution Behavior ◽  
Next Generation ◽  
Material Stability ◽  
Complex Metal ◽  
Complex Metal Oxide ◽  
Nickel Manganese ◽  
Nickel Enrichment

Nickel-enriched lithium nickel manganese cobalt oxide, an increasingly used complex metal oxide, has unexpected dissolution behavior and impacts on two model environmental organisms.

Synthesis, Characterization and Photocatalytic Property of Magnetic Titania Hollow Sphere Composite

2011 ◽  
Vol 298 ◽  
pp. 188-192
Author(s):  
Cong Zhang ◽  
Rong Hou ◽  
Hui Zhang
Keyword(s):  
Sol Gel ◽  
Hollow Spheres ◽  
Photocatalytic Property ◽  
High Photocatalytic Activity ◽  
Polystyrene Spheres ◽  
Magnetic Photocatalyst ◽  
Uv Illumination ◽  
Transmission Electron ◽  
Anatase Titania ◽  
Tio2 Hollow Spheres

The magnetic anatase titania (TiO2) hollow spheres have been fabricated as magnetic photocatalyst by template (polystyrene)-sacrificed method, in which cobalt ferrite and titania was sequentially deposited on the surface of polystyrene spheres via coprecipitation and sol-gel process followed by calcinations. X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM) were employed to characterize the products, and the photocatalytic activities were evaluated by photodegradation of methyl orange (MO) under UV illumination. The results indicate that the as-prepared magnetic titania hollow spheres exhibit magnetic property and high photocatalytic activity.

scholarly journals A General Synthesis Strategy for Hierarchical Porous Metal Oxide Hollow Spheres

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Huadong Fu ◽  
Feng Ren ◽  
Weiming Su ◽  
Jinlin Yang ◽  
Ruiping Liu
Keyword(s):  
Metal Oxide ◽  
Hollow Spheres ◽  
Porous Metal ◽  
Spherical Shape ◽  
Tetrabutyl Titanate ◽  
Carbon Spheres ◽  
Hydrothermal Conditions ◽  
Synthesis Strategy ◽  
Hierarchical Porous ◽  
General Synthesis

The hierarchical porous TiO2hollow spheres were successfully prepared by using the hydrothermally synthesized colloidal carbon spheres as templates and tetrabutyl titanate as inorganic precursors. The diameter and wall thickness of hollow TiO2spheres were determined by the hard templates and concentration of tetrabutyl titanate. The particle size, dispersity, homogeneity, and surface state of the carbon spheres can be easily controlled by adjusting the hydrothermal conditions and adding certain amount of the surfactants. The prepared hollow spheres possessed the perfect spherical shape, monodispersity, and hierarchically pore structures, and the further experiment verified that the present approach can be used to prepare other metal oxide hollow spheres, which could be used as catalysis, fuel cells, lithium-air battery, gas sensor, and so on.

Hollow Spherical CaMoO4:Eu3+, Li+ Phosphors Prepared by Spray Pyrolysis

2013 ◽  
Vol 652-654 ◽  
pp. 563-566
Author(s):  
Xia Wang ◽  
Chang Cheng Liu ◽  
Zhen Hua Liang ◽  
Gui Hua Peng ◽  
Xiao Bao Han
Keyword(s):  
Spray Pyrolysis ◽  
Hollow Spheres ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Spray Pyrolysis Method ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Red Phosphors ◽  
Diffraction Peaks

Hollow spherical CaMoO4:Eu3+, Li+red phosphors have been successfully synthesized by spray pyrolysis method. The crystalline phase, morphology and luminescent properties of the obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence emission spectra (PL). The XRD results demonstrated that all the diffraction peaks of the samples can be well indexed to the tetragonal phase of CaMoO4. The SEM images showed that the particles were composed of hollow spheres, whose diameters are about 1.4 μm. The as-prepared CaMoO4:Eu3+, Li+hollow spheres show a strong red emission corresponding to the5D0-7F2transition of the Eu3+ ions under ultraviolet light.

H3BO3-Induced Formation of Metal Oxide Hollow Spheres in Flowing Aerosols

2009 ◽  
Vol 113 (14) ◽  
pp. 5455-5459 ◽  
Author(s):  
Xiao Song ◽  
Xing Ding ◽  
Pengna Li ◽  
Zhihui Ai ◽  
Lizhi Zhang
Keyword(s):  
Metal Oxide ◽  
Hollow Spheres
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