Sensitivity of titania(B) nanowires to nitroaromatic and nitroamino explosives at room temperature via surface hydroxyl groups

2011 ◽  
Vol 21 (20) ◽  
pp. 7269 ◽  
Author(s):  
Danling Wang ◽  
Antao Chen ◽  
Sei-Hum Jang ◽  
Hin-Lap Yip ◽  
Alex K.-Y. Jen
Keyword(s):  
Room Temperature ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups

Role of surface hydroxyl groups in promoting room temperature CO sensing by Pd-modified nanocrystalline SnO2

2010 ◽  
Vol 183 (10) ◽  
pp. 2389-2399 ◽  
Author(s):  
Artem V. Marikutsa ◽  
Marina N. Rumyantseva ◽  
Lada V. Yashina ◽  
Alexander M. Gaskov
Keyword(s):  
Room Temperature ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups

Interactions of formic acid, formaldehyde, and methanol with germania surfaces

1969 ◽  
Vol 47 (6) ◽  
pp. 1077-1083 ◽  
Author(s):  
J. C. McManus ◽  
Kun-Ichi Matsushita ◽  
M. J. D. Low
Keyword(s):  
Formic Acid ◽  
Room Temperature ◽  
High Pressures ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Treated Sample ◽  
Covalently Bonded ◽  
Surface Hydroxyls ◽  
Surface Formate

Infrared studies of the interaction of, respectively, formic acid, formaldehyde, and methanol with hydroxylated germania gel surfaces were made. Formic acid was dissociatively adsorbed to give covalently bonded formate species and new surface hydroxyl groups. Monomeric formic acid could not be observed. Degassing the treated sample at 246° removed most of the surface formate and the perturbing effects on the surface hydroxyls were also decreased. Two adsorbed species were observed when germania was exposed to high pressures (~10 Torr) of formaldehyde at room temperature. One species was very weakly bonded; it was removed by degassing at room temperature and its structure is tentatively taken as formaldehyde hydrogen-bonded to the surface hydroxyl groups. The other species had a spectrum very similar to polyoxymethylene, and it is proposed that it was in fact a surface polymer formed through the catalytic effect of the surface hydroxyl groups. Methanol was dissociatively adsorbed on germania surfaces. A species attributed to surface methoxide was formed and the concentration of the surface hydroxyl groups increased. Also, small concentrations of two other species were observed which gave absorptions at 2195 and 1727 cm−1, respectively. The band at 2195 cm−1 is assigned to a Ge—H species formed, possibly, at non-stoichiometric portions of the surface, while the latter species is tentatively ascribed to a surface formate species.

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.

Controllable synthesis of phosphate-modified BiPO4 nanorods with high photocatalytic activity: surface hydroxyl groups concentrations effects

RSC Advances ◽  
2015 ◽  
Vol 5 (121) ◽  
pp. 99712-99721 ◽  
Author(s):  
Yan Li ◽  
Yawen Wang ◽  
Yu Huang ◽  
Junji Cao ◽  
Wingkei Ho ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Surface Modification ◽  
Photocatalytic Performance ◽  
High Photocatalytic Activity ◽  
Hydroxyl Groups ◽  
Controllable Synthesis ◽  
Surface Hydroxyl ◽  
Methylene Orange ◽  
Surface Hydroxyl Groups

Surface modification by phosphate efficiently improves the photocatalytic performance of BiPO4 for the degradation of methylene orange (MO), by enhancing the concentration of surface hydroxyl groups and improving its hydrophilicity.

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