Synthesis and Characterization of TiO2/ PSt/PVP Multilayer Core-Shell Hybrid Microspheres

2012 ◽  
Vol 512-515 ◽  
pp. 2443-2447 ◽  
Author(s):  
Li Ying Guo
Keyword(s):  
Decomposition Temperature ◽  
Tetrabutyl Titanate ◽  
Core Shell ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Ft Ir ◽  
Hydrolysis Of ◽  
Thermal Stability Of

Multiplayer core-shell TiO2/PSt/PVP hybrid microspheres were successfully synthesized by the copolymerization of vinylpyrrolidone in the solution of ethyl acetate with TiO2/PSt core-shell hybrid microspheres which were formed through the encapsulation of KH570-g-TiO2 sol particles with styrene, while the active KH570-g-TiO2 sol particles were prepared by the hydrolysis condensation of KH-570 with tetrabutyl titanate. Characterization technologies of FT-IR and TGA were applied to investigate the structure and the thermal stability of the product. The results showed that the hydroxyl groups from the hydrolysis of KH-570 condensed with the surface hydroxyl groups of TiO2, as well as PSt and PVP were grafted successively onto the surface of KH570-g-TiO2 sol particles. The thermal decomposition temperature of TiO2/PSt/PVP was higher than TiO2/PSt, which also indicated that the obtained product was the final objective product.

Electron microscopy and krypton adsorption characterization of high-purity MgO powder

1986 ◽  
Vol 1 (1) ◽  
pp. 114-119
Author(s):  
M. Bretz ◽  
A. G. Shastri ◽  
J. Schwank
Keyword(s):  
Large Scale ◽  
Gas Adsorption ◽  
Crystal Surface ◽  
Crystal Defects ◽  
Atomic Scale ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Krypton Adsorption

A promising method for the preparation of sizeable quantities of structurally well-defined, highpurity MgO powder is reported. The morphology and surface uniformity of the powder is comparable to that of MgO smokes but with narrow size distribution of particles. Sample characterization of these oxide powders is accomplished by combining structural TEM/STEM examination with krypton gas adsorption isotherms. The latter technique is sensitive to the presence of surface hydroxyl groups and of surface roughness on an atomic scale. Highresolution TEM indicates a perfect cubic morphology, intra-crystallite orientation, and dendritic sintering of cubes. In the STEM mode sharp convergent beam electron diffraction patterns are obtained, and in thick specimen regions Kikuchi lines appear, indicating the absence of crystal defects. After prolonged outgassing to remove surface hydroxyl groups, a krypton adsorption isotherm contains a near vertical submonolayer riser and second layer step along with partial wetting features near saturation. These near-ideal dendritic ceramic powders, therefore, provide a research bridge between single crystal surface studies and large-scale powder technology.

Cooperation between the surface hydroxyl groups of Ru–SiO2@mSiO2and water for good catalytic performance for hydrogenation of quinoline

2014 ◽  
Vol 4 (7) ◽  
pp. 1939-1948 ◽  
Author(s):  
Lei Zhang ◽  
Xiaoyan Wang ◽  
Ying Xue ◽  
Xiaojun Zeng ◽  
Hua Chen ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Core Shell ◽  
Hydroxyl Groups ◽  
Excellent Performance ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups

A new core–shell catalyst showing excellent performance and stability was used in the hydrogenation of quinoline in water.

Synthesis and Characterization of Emulsion Coating of Fluorinated Polymethacrylate Modified by POSS

2014 ◽  
Vol 936 ◽  
pp. 337-342 ◽  
Author(s):  
Bao Juan Tian ◽  
Jun Gang Gao ◽  
Chao Wang
Keyword(s):  
Particle Diameter ◽  
Mechanical Analysis ◽  
Decomposition Temperature ◽  
Latex Film ◽  
Structure And Properties ◽  
Ft Ir ◽  
Oligomeric Silsesquioxane ◽  
Acrylate Monomers ◽  
Thermal Stability Of

The core-shell nanocomposite particles were prepared from acrylate monomers and octavinyl polyhedral oligomeric silsesquioxane (V-POSS) by emulsion polymerization. The structure and properties of emulsion and latex film were characterized by FT-IR, dynamic mechanical analysis (DMA) and TEM and laser particle diameter analyzer (LPDA). The results showed that the V-POSS/polyacrylated (V-POSS/PMA) composite latexes was prepared and the diameter is about 36.1 nm when added 5wt% V-POSS. DMA results showed that the mechanical loss (tanδ) peak temperature (Tp) of the film enhance with increasing V-POSS content and had the best high Tp at 88.4°C for added 7 wt% V-POSS, which increased 7.8 °C than had not V-POSS. Thermogravimetric analysis (TGA) showed that the addition of V-POSS can increase the thermal decomposition temperature and improved the thermal stability of polyacrylate.

FT-IR and solid-state NMR investigation of surface hydroxyl groups on dealuminated ZSM-5

1994 ◽  
Vol 75 (1-4) ◽  
pp. 204-212 ◽  
Author(s):  
Aila Maijanen ◽  
Eric G. Derouane ◽  
Janos B. Nagy
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Ft Ir

Comparative study of the surface hydroxyl groups of fumed and precipitated silicas. 3. DRIFT characterization of grafted n-hexadecyl chains

Langmuir ◽  
1990 ◽  
Vol 6 (8) ◽  
pp. 1389-1395 ◽  
Author(s):  
A. Burneau ◽  
O. Barres ◽  
A. Vidal ◽  
H. Balard ◽  
G. Ligner ◽  
...  
Keyword(s):  
Comparative Study ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups
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