Reactions of ammonia with porous glass surfaces

1967 ◽  
Vol 71 (6) ◽  
pp. 1726-1734 ◽  
Author(s):  
Manfred J. D. Low ◽  
Natesan Ramasubramanian ◽  
V. V. Subba Rao
Keyword(s):  
Porous Glass ◽  
Glass Surfaces

Application of the optical method for determining of the RMS roughness of porous glass surfaces

2008 ◽  
Vol 354 (28) ◽  
pp. 3241-3245 ◽  
Author(s):  
E. Dobierzewska-Mozrzymas ◽  
E. Rysiakiewicz-Pasek ◽  
P. Biegański ◽  
J. Polańska ◽  
E. Pieciul
Keyword(s):  
Porous Glass ◽  
Optical Method ◽  
Glass Surfaces

Infrared spectra of the interactions of aniline and porous glass surfaces

1969 ◽  
Vol 47 (8) ◽  
pp. 1281-1287 ◽  
Author(s):  
M. J. D. Low ◽  
V. V. Subba Rao
Keyword(s):  
Nitrogen Atom ◽  
Aromatic Ring ◽  
Secondary Amine ◽  
Infrared Spectra ◽  
Porous Glass ◽  
Weak Interactions ◽  
Amine Group ◽  
Oh Groups ◽  
Glass Surfaces ◽  
Adsorption And Dissociation

Infrared spectra were recorded of aniline sorbed on highly dehydroxylated, deuterated, and on fluoridated porous glass as well as on pure and boria-impregnated silica. The results suggest that two types of weak interactions involving the surface SiOH and B—OH groups occurred; the nitrogen atom of the amine was hydrogen bonded to surface OH and there was an interaction between OH groups and the π system of the aromatic ring. Some aniline chemisorbed on surface boron via the nitrogen atom of the amine group. Some aniline chemisorbed dissociatively to form secondary amine structures bonded through the nitrogen to surface boron atoms and new B—OH groups formed. Surface boron impurity acted as an adsorption and dissociation center.

Infrared study of the interactions of acetone and siliceous surfaces

1969 ◽  
Vol 47 (14) ◽  
pp. 2545-2554 ◽  
Author(s):  
J. C. McManus ◽  
Yoshio Harano ◽  
M. J. D. Low
Keyword(s):  
Hydrogen Bonds ◽  
Carbonyl Group ◽  
Boron Atom ◽  
Porous Glass ◽  
Carbonyl Groups ◽  
Infrared Study ◽  
Oh Groups ◽  
Silica Surfaces ◽  
Surface Hydroxyls ◽  
Glass Surfaces

Adsorbed acetone is held to silica surfaces by hydrogen bonds between surface silanols and the acetone carbonyl groups. Acetone is adsorbed by this mechanism on porous glass surfaces but there is also some decomposition, as shown by the increase in surface B—OH groups and by formation of new C—H absorptions at 2984 and 2940 cm−1. Experiments with boron-impregnated silica indicated that the presence of boron in the porous glass can account for this decomposition process. Bands at 1660–1670 and 1650 cm−1, observed when acetone and acetone-d6, respectively, were adsorbed on either porous glass or boron-impregnated silica, are attributed to ν(C=O) of the carbonyl group coordinated with a surface boron atom. The surface hydroxyls of both silica and porous glass could exchange with the deuterium of acetone-d6 via a mechanism involving an enol intermediate.

Ellipsometry and spectroscopy of porous glass surfaces

Vacuum ◽  
2001 ◽  
Vol 61 (2-4) ◽  
pp. 123-128 ◽  
Author(s):  
V.S. Ovechko ◽  
A.M. Dmytruk ◽  
O.V. Fursenko ◽  
T.P. Lepeshkina
Keyword(s):  
Porous Glass ◽  
Glass Surfaces

scholarly journals The Movement of Melting Ice Over Rough Surfaces

1975 ◽  
Vol 14 (71) ◽  
pp. 287-292 ◽  
Author(s):  
B. D. Chadbourne ◽  
R. M. Cole ◽  
S. Tootill ◽  
M. E. R. Walford
Keyword(s):  
Porous Glass ◽  
Laboratory Experiments ◽  
Water Regime ◽  
The Other ◽  
Porous Surface ◽  
Ground Glass ◽  
Frictional Energy ◽  
Mean Diameter ◽  
Melt Water ◽  
Glass Surfaces

Laboratory experiments show that pieces of melting ice about one centimetre across, moving under normal loads across roughened glass surfaces, travel much faster than regelation theory predicts. The discrepancy is as much as 40 times for the finest scale surfaces, (prepared by grinding with carborundum particles of 60 μm mean diameter) and increases further if the load is reduced below three bars. On the other hand melting ice moves, under similar conditions, across rough porous glass surfaces at approximately the speed predicted by regelation theory. We suggest the reason is that melt water, produced by the dissipation of frictional energy, accumulates at the interface between ice and ground glass where it promotes sliding, but can easily drain away from a porous surface. Similar effects at the bed of a temperate glacier may cause the contribution of regelation to the bed-slip process to depend sensitively upon the melt-water regime.

scholarly journals The Movement of Melting Ice Over Rough Surfaces

1975 ◽  
Vol 14 (71) ◽  
pp. 287-292 ◽  
Author(s):  
B. D. Chadbourne ◽  
R. M. Cole ◽  
S. Tootill ◽  
M. E. R. Walford
Keyword(s):  
Porous Glass ◽  
Laboratory Experiments ◽  
Water Regime ◽  
The Other ◽  
Porous Surface ◽  
Ground Glass ◽  
Frictional Energy ◽  
Mean Diameter ◽  
Melt Water ◽  
Glass Surfaces

Abstract Laboratory experiments show that pieces of melting ice about one centimetre across, moving under normal loads across roughened glass surfaces, travel much faster than regelation theory predicts. The discrepancy is as much as 40 times for the finest scale surfaces, (prepared by grinding with carborundum particles of 60 μm mean diameter) and increases further if the load is reduced below three bars. On the other hand melting ice moves, under similar conditions, across rough porous glass surfaces at approximately the speed predicted by regelation theory. We suggest the reason is that melt water, produced by the dissipation of frictional energy, accumulates at the interface between ice and ground glass where it promotes sliding, but can easily drain away from a porous surface. Similar effects at the bed of a temperate glacier may cause the contribution of regelation to the bed-slip process to depend sensitively upon the melt-water regime.

scholarly journals Development of porous glass surfaces with recoverable hydrophobicity

2019 ◽  
Vol 1 ◽  
pp. 100002
Author(s):  
Liliane C.C. Auwerter ◽  
Michael R. Templeton ◽  
Maarten van Reeuwijk ◽  
Oluwadamilola O. Taiwo ◽  
Christopher Cheeseman
Keyword(s):  
Porous Glass ◽  
Glass Surfaces
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