Heterophasic isotope exchange in nanoscale metal oxide particles. Lattice oxygen and surface hydroxyl groups and water vapor (D2O and H218O)

1992 ◽  
Vol 4 (3) ◽  
pp. 611-615 ◽  
Author(s):  
Yong Xi Li ◽  
Kenneth J. Klabunde
Keyword(s):  
Water Vapor ◽  
Metal Oxide ◽  
Isotope Exchange ◽  
Lattice Oxygen ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Oxide Particles

The Effect of Cell Behavior on Plasma Sprayed HA Coatings with Different Post Treatment

2006 ◽  
Vol 309-311 ◽  
pp. 705-708 ◽  
Author(s):  
Y. Cao ◽  
Qiang Lin ◽  
Min Tang ◽  
X.Q. Ying ◽  
Su Juan Pang ◽  
...  
Keyword(s):  
Water Vapor ◽  
Cell Activity ◽  
Post Treatment ◽  
Biological Behavior ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Ha Coating ◽  
Surface Hydroxyl Groups ◽  
Plasma Sprayed

The initial interactions of plasma-sprayed HA coating surface with osteoblasts was investigated. Two kind of post-treatment methods were been used for HA coating: (1) Heated in air at 650oC for 30 min, (2) Heated in water vapor at 125oC, 0.15Mpa for 6 hours. The third passage rabbit osteoblasts were cultured on the HA coating plates for 24 h. The results showed: The lower dissolution rate and more surface hydroxyl groups (OH-1) group in the HA coating resulted in greater numbers of adhered osteoblasts and higher cell activity, The post-water vapor treated HA coating have better biological behavior in vitro.

The synthesis and structure of silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complexes

1986 ◽  
Vol 51 (7) ◽  
pp. 1430-1438 ◽  
Author(s):  
Alena Reissová ◽  
Zdeněk Bastl ◽  
Martin Čapka
Keyword(s):  
Free Surface ◽  
Hydroxyl Groups ◽  
Titanium Complex ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Free Hydroxyl ◽  
Cyclopentadienyl Anion

The title complexes have been obtained by functionalization of silica with cyclopentadienylsilanes of the type Rx(CH3)3 - xSi(CH2)nC5H5 (x = 1-3, n = 0, 1, 3), trimethylsilylation of free surface hydroxyl groups, transformation of the bonded cyclopentadienyl group to the cyclopentadienyl anion, followed by coordination of (h5-cyclopentadienyl)trichlorotitanium. The effects of single steps of the above immobilization on texture of the support, the number of free hydroxyl groups, the coverage of the surface by cyclopentadienyl groups and the degree of their utilization in anchoring the titanium complex have been investigated. ESCA study has shown that the above anchoring leads to formation of the silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complex.

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