Charge distribution and bonding in the series (CF3)2On (n = 0-3) and in CF3SCF3 deduced from gas-phase x-ray photoelectron spectroscopy. Evidence for double bonding in saturated compounds

1981 ◽  
Vol 103 (2) ◽  
pp. 329-334 ◽  
Author(s):  
Patrick Brant ◽  
Joseph A. Hashmall ◽  
Forrest L. Carter ◽  
Ronald De Marco ◽  
William B. Fox
Keyword(s):  
Gas Phase ◽  
Charge Distribution ◽  
Photoelectron Spectroscopy ◽  
X Ray

Gas‐phase x‐ray photoelectron spectroscopy of model molecules relating to the thermochromism in poly(3‐alkylthiophene)

1990 ◽  
Vol 93 (9) ◽  
pp. 6357-6362 ◽  
Author(s):  
M. P. Keane ◽  
S. Svensson ◽  
A. Naves de Brito ◽  
N. Correia ◽  
S. Lunell ◽  
...  
Keyword(s):  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
X Ray

The Influence of Structure on Ba and K Uptake by a Synthetic Phyllomanganate

Clay Minerals ◽  
1994 ◽  
Vol 29 (2) ◽  
pp. 215-222 ◽  
Author(s):  
E. Paterson ◽  
R. Swaffield ◽  
L. Clark
Keyword(s):  
Chemical Analysis ◽  
Cation Exchange ◽  
Exchange Reaction ◽  
Charge Distribution ◽  
Photoelectron Spectroscopy ◽  
Basal Spacing ◽  
K Uptake ◽  
Selective Uptake ◽  
X Ray ◽  
Bulk Chemical

AbstractThe uptake of Ba2+ and K+ by a synthetic Na-phyllomanganate has been studied by chemical analysis, X-ray diffractometry and X-ray photoelectron spectroscopy. The changes in basal spacing arising from cation exchange have been used to monitor the progress of the exchange reaction and confirm the selectivity measured by bulk chemical analysis. However, the selective uptake of Ba2+ over Ca2+ is much greater than that of K+ over Na+ and it is suggested that charge distribution in the interlayer is important. The results are discussed in the light of recent advances in our understanding of the phyllomanganate structure.

X-Ray photoelectron spectroscopy of monosubstituted perfluorobenzenes

1977 ◽  
Vol 55 (8) ◽  
pp. 1279-1284 ◽  
Author(s):  
Barry C. Trudell ◽  
S. James W. Price
Keyword(s):  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
Binding Energies ◽  
Photoelectron Spectra ◽  
Atomic Charges ◽  
X Ray ◽  
Sophisticated Analysis ◽  
Charge Calculations

The gas phase X-ray photoelectron spectra, XPS, were observed for the series C6F5X (X = F, Cl, I, Br, H). Binding energies were determined from the spectra using the ESCAPLOT Program. Charge calculations were carried out using Equalization of Electronegativity, CNDO/2, and ACHARGE approaches on each molecule. The more sophisticated analysis leads to the following equation correlating the (C 1s) binding energies and the atomic charges qi[Formula: see text]

The application of gas phase and solid state X-ray photoelectron spectroscopy to the investigation of derivatives containing the repeating SN unit

1980 ◽  
Vol 1 (2) ◽  
pp. 161-173 ◽  
Author(s):  
Patrick Brant ◽  
David C. Weber ◽  
Curtis T. Ewing ◽  
Forrest L. Carter ◽  
Joseph A. Hashmall
Keyword(s):  
Solid State ◽  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
X Ray

scholarly journals Photoactivity of Titanium Dioxide Foams

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Maryam Jami ◽  
Ralf Dillert ◽  
Yanpeng Suo ◽  
Detlef W. Bahnemann ◽  
Michael Wark
Keyword(s):  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
Colloidal Suspensions ◽  
Air Purification ◽  
Semiconductor Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mechanical Stirring ◽  
Amphiphilic Molecules ◽  
Oxidation Of No

TiO2 foams have been prepared by a simple mechanical stirring method. Short-chain amphiphilic molecules have been used to stabilize colloidal suspensions of TiO2 nanoparticles. TiO2 foams were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis absorption spectroscopy, and scanning electron microscopy (SEM). The photoassisted oxidation of NO in the gas phase according to ISO 22197-1 has been used to compare the photoactivity of the newly prepared TiO2 foams to that of the original powders. The results showed that the photoactivity is increased up to about 135%. Foam structures seem to be a good means of improving the photoactivity of semiconductor materials and can readily be used for applications such as air purification devices.

Nanostructured TiO2 modified by perfluoropolyethers: Gas phase photocatalytic activity

2010 ◽  
Vol 25 (1) ◽  
pp. 96-103 ◽  
Author(s):  
Claudia L. Bianchi ◽  
Silvia Ardizzone ◽  
Giuseppe Cappelletti ◽  
Giuseppina Cerrato ◽  
Walter Navarrini ◽  
...  
Keyword(s):  
Gas Phase ◽  
Surface Area ◽  
Photoelectron Spectroscopy ◽  
Surface Composition ◽  
High Surface ◽  
Ammonium Phosphate ◽  
Water Contact ◽  
Electronic Band ◽  
X Ray ◽  
Bet Analysis

A high-molecular-weight perfluoropolyether (PFPE-YR) and a perfluoropolyether containing ammonium phosphate (PFPE-F10) have been evaluated as fluorinated coating for high-surface-area titanium oxides. Coated nano-TiO2 shows hydrophobic properties and excellent buoyancy on water. In addition to photoactivity toward the degradation of toluene in gas phase, specific trial analyses have been completed to estimate the modified titanium oxide features. Brunauer–Emmett–Teller (BET) analysis for the surface area determination, ultraviolet-visible spectroscopy (UV-Vis) for the material electronic band gap, high-resolution transmission electron microscopy (HRTEM), x-ray diffraction (XRD), and x-ray photoelectron spectroscopy (XPS) for the morphology, structure, and surface composition, respectively, and water contact angle and infrared (IR) analysis have been performed to estimate the wettability and stability of coated titanium.

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