Behaviour of the surface hydroxide groups of exfoliated kaolinite in the gas phase and during water adsorption

2016 ◽  
Vol 45 (6) ◽  
pp. 2523-2535 ◽  
Author(s):  
Attila Táborosi ◽  
Róbert K. Szilágyi
Keyword(s):  
Gas Phase ◽  
Crystalline Phase ◽  
Water Adsorption ◽  
Chemical Environment ◽  
Presence And Absence

New insights: surface hydroxide groups of the O-sheet and bridging oxide anions of the T-sheet adopt very different orientations in the exfoliated kaolinite from those in the crystalline phase as a function of the presence and absence of an external chemical environment that significantly influences clay reactivity.

Understanding the crystalline phase formation in Fe Ni and Al Ni binary alloy-nanoparticles produced by thermal plasma assisted gas phase condensation method

2016 ◽  
Vol 112 ◽  
pp. 495-504 ◽  
Author(s):  
Nilesh S. Kanhe ◽  
Atul K. Tak ◽  
Ashok B. Nawale ◽  
Suyog A. Raut ◽  
Sudha V. Bhoraskar ◽  
...  
Keyword(s):  
Gas Phase ◽  
Phase Formation ◽  
Binary Alloy ◽  
Thermal Plasma ◽  
Crystalline Phase ◽  
Alloy Nanoparticles ◽  
Condensation Method

Der Zeemann-Effekt im Rotationsspektrum von 2-Fluoropyridin

1971 ◽  
Vol 26 (10) ◽  
pp. 1644-1657 ◽  
Author(s):  
D. Sutter
Keyword(s):  
Magnetic Susceptibility ◽  
Liquid Phase ◽  
Gas Phase ◽  
Crystalline Phase ◽  
Zeeman Effect ◽  
Short Description ◽  
Rotational Spectrum ◽  
Magnetic Susceptibility Anisotropy ◽  
Out Of Plane ◽  
Phase Out

Abstract The molecular Zeeman effect has been observed in the rotational spectrum of 2-fluoropyridine at magnetic fields close to 25000 G. The measured molecular g-values are gaa = -0.0880 ± 0.0007, gbb = - 0.0405 ±0.0006, gcc = + 0.0233 ±0.0006, and the two linearily independant components of the magnetic susceptibility anisotropy are 2 · χaa - χbb - χcc = 50.5 ± 1.6 and 2 · χbb - χcc - χaa - 53.8 ± 1.1 in units of 10-6 erg/G2 mol). The a-axis is close to the C-F-bond and the c-axis is perpendicular to the plane of the ring. A comparison of the gas-phase out-of-plane minus the average in-plane values for the susceptibilities of 2-fluoropyridine, pyridine, and fluorobenzene with the corresponding value for benzene in crystalline phase leads to the conclusion that the susceptibilities may change in the order of 10% when going from solid or liquid phase to the gasphase. A short description of the microwave-Zeeman spectrograph built at Kiel University is given. In the theoretical section expressions for the g-values and susceptibilities are derived which are more complete then those used up to now.

scholarly journals Pressure dependent aerosol formation from the cyclohexene gas-phase ozonolysis in the presence and absence of sulfur dioxide: a new perspective on the stabilisation of the initial clusters

2012 ◽  
Vol 14 (33) ◽  
pp. 11695 ◽  
Author(s):  
Philip Thomas Michael Carlsson ◽  
Janina Elisabeth Dege ◽  
Claudia Keunecke ◽  
Bastian Christopher Krüger ◽  
Jan Lennard Wolf ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Gas Phase ◽  
Aerosol Formation ◽  
Presence And Absence ◽  
New Perspective

Rate of14N2 desorption from the surfaces of nitrides in the presence and absence of15N2 in the gas phase

1985 ◽  
Vol 29 (2) ◽  
pp. 433-441 ◽  
Author(s):  
V. I. Sobolev ◽  
G. I. Panov ◽  
A. S. Kharitonov
Keyword(s):  
Gas Phase ◽  
Presence And Absence

scholarly journals Direct visualization of subcritical nuclei in molecular film growth

2014 ◽  
Vol 70 (a1) ◽  
pp. C1606-C1606
Author(s):  
Daniel Schwarz
Keyword(s):  
Gas Phase ◽  
Crystalline Phase ◽  
Film Growth ◽  
Careful Analysis ◽  
Acid Group ◽  
Linear Molecule ◽  
Supramolecular Network ◽  
Bright Field Image ◽  
Phenyl Rings ◽  
Different Temperatures

The growth and structure of 4,4'-biphenyldicarboxylic-acid (BDA) on Cu(001) at temperatures between 300 K and 400 K was studied by LEEM and μ-LEED. BDA is a linear molecule consisting of two phenyl rings with a carboxylic-acid group at opposite ends. During growth on Cu(001) the adsorbed BDA molecules form first a disordered 2D gas phase. Once this phase reaches a sufficiently large density, a crystalline phase nucleates, in which the molecules form a hydrogen-bonded 2D supramolecular network. By a careful analysis of the LEEM bright-field image intensity we can measure the density of the 2D gas phase, which is up to 40% of that in the crystalline phase. From the equilibrium densities at different temperatures we can construct the 2D phase diagram and extract the cohesive energy (0.35 eV). During the distinct nucleation period we can observe a fascinating phenomenon: sub-critical nuclei form, grow up to 4000 nm2in size and decay with lifetimes of several seconds. These sizes are considerably larger than what is usually seen in epitaxial growth and we explain this observation with the relatively weak intermolecular interactions.

Derivatives of 1-phenyl-3-methylpyrazol-2-in-5-thione and their oxygen analogues in the crystalline phase and their tautomeric transformations in solutions and in the gas phase

2001 ◽  
Vol 570 (1-3) ◽  
pp. 215-223 ◽  
Author(s):  
Galina A. Chmutova ◽  
Olga N. Kataeva ◽  
Hubertus Ahlbrecht ◽  
Almira R. Kurbangalieva ◽  
Alexander I. Movchan ◽  
...  
Keyword(s):  
Gas Phase ◽  
Crystalline Phase ◽  
Derivatives Of

Reactions of thiyl radicals. V. The gas phase photolysis of methyl disulfide and ethyl disulfide mixtures in the presence of ethylene

1968 ◽  
Vol 46 (14) ◽  
pp. 2462-2464 ◽  
Author(s):  
P. M. Rao ◽  
A. R. Knight
Keyword(s):  
Gas Phase ◽  
Methyl Ethyl ◽  
Thiyl Radicals ◽  
Disulfide Formation ◽  
Presence And Absence ◽  
Low Efficiency

The gas phase photolysis of methyl disulfide and ethyl disulfide and their mixtures, in the presence and absence of ethylene, has been studied at 25 °C and λ = 2300–2800 Å. The pure substrates give predominantly the corresponding thiol, whereas co-photolysis yields methyl ethyl disulfide in appreciably larger yields.When ethylene is added, the substrates individually show a reduction in RSH rate and the formation of relatively small amounts of sulfides. In their co-photolysis, added C2H4 does not appreciably alter the rate of methyl ethyl disulfide formation, indicating a low efficiency of RS scavenging by the olefin in this system.Isopropanol and 2,3-dimethyl butane do not increase the thiol yield from the pure substrates.

Dissociative Water Adsorption by Al3O4+ in the Gas Phase

2017 ◽  
Vol 8 (6) ◽  
pp. 1272-1277 ◽  
Author(s):  
Matias R. Fagiani ◽  
Xiaowei Song ◽  
Sreekanta Debnath ◽  
Sandy Gewinner ◽  
Wieland Schöllkopf ◽  
...  
Keyword(s):  
Gas Phase ◽  
Water Adsorption
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