Collisions of Slow Polyatomic Ions with Surfaces:  Dissociation and Chemical Reactions of CD5+, CD4+•, CD3+, and Their Isotopic Variants on Room-Temperature and Heated Carbon Surfaces†

2002 ◽  
Vol 106 (33) ◽  
pp. 8293-8301 ◽  
Author(s):  
Jana Roithová ◽  
Ján Žabka ◽  
Zdenek Dolejšek ◽  
Zdenek Herman
Keyword(s):  
Chemical Reactions ◽  
Room Temperature ◽  
Polyatomic Ions ◽  
Carbon Surfaces

Energy partitioning in collisions of slow polyatomic ions with carbon surfaces

2002 ◽  
Vol 213 (2-3) ◽  
pp. 145-156 ◽  
Author(s):  
J Žabka ◽  
Z Dolejšek ◽  
J Roithová ◽  
V Grill ◽  
T.D Märk ◽  
...  
Keyword(s):  
Energy Partitioning ◽  
Polyatomic Ions ◽  
Carbon Surfaces

scholarly journals Quantum Chemical Calculation of Reactions Involving C20, C60, Graphene and H2O

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940008 ◽  
Author(s):  
N. A. Poklonski ◽  
S. V. Ratkevich ◽  
S. A. Vyrko ◽  
A. T. Vlassov ◽  
Nguyen Ngoc Hieu
Keyword(s):  
Gibbs Energy ◽  
Chemical Reactions ◽  
Atmospheric Pressure ◽  
Room Temperature ◽  
Hydrogen Release ◽  
Graphene Sheets ◽  
Water Molecules ◽  
Hydroxyl Groups ◽  
Chemical Calculation ◽  
Assisted Decomposition

Calculations of chemical reactions between C20, C60, hydrogen and water molecules are carried out using the PM3 method. Reactions with a hydrogen release at room temperature and atmospheric pressure are identified by the Gibbs energy change. The hydrogen release can be raised by increasing the number of water molecules in chlorine-assisted decomposition of fullerenes. Calculations of the Gibbs energy of chemical reactions involving water molecules between two parallel curved graphene sheets are carried out using DFT with the functional UB3LYP. During pumping between plates of an electric capacitor designed from curved graphene sheets, the water vapor with the assistance of external illumination is enriched by electrically neutral hydroxyl groups (OH)0.

Plasticization of Rubber in the Form of Latex

1954 ◽  
Vol 27 (1) ◽  
pp. 271-276 ◽  
Author(s):  
Marc Conté
Keyword(s):  
Hydrogen Peroxide ◽  
Chemical Reactions ◽  
Room Temperature ◽  
Ph Value ◽  
Inhibitory Effect ◽  
Rubber Latex ◽  
Adhesive Properties ◽  
Harmful Effects ◽  
Latex Rubber

Abstract When in the form of latex, rubber can be oxidized by thiols under hot conditions. The reaction apparently proceeds by the same mechanism as that characteristic in the action of peptizing agents on rubber during mastication. The results obtained confirm the hypothesis that the thiol is transformed quantitatively into the corresponding disulfide, with resultant oxidation of the rubbert. This transformation is a function of the pH value, and the best results are obtained when the pH value is around 4 and in the absence of NH4 ions (which have an inhibitory effect). Latex preparations of this type can be utilized for studying the chemical reactions of rubber in emulsion and for the preparation of rubber derivatives which are more soluble than those prepared from rubber latex which has not been degraded. In addition, such latex preparations are excellent adhesives which, in contrast to already known products (latex treated with hydrogen peroxide or other peroxides), give a sticky film by simple drying at room temperature. In this way heating can be avoided in cases where it has harmful effects and where the use of an oven is inconvenient. Finally, this type of latex is more adaptable to certain direct applications, both because of the superior adhesive properties of the rubber and because, with a relatively plastic coagulum, mastication is easier.

Dynamic and Structural Properties of Room-Temperature Ionic Liquids near Silica and Carbon Surfaces

Langmuir ◽  
2013 ◽  
Vol 29 (31) ◽  
pp. 9744-9749 ◽  
Author(s):  
Song Li ◽  
Kee Sung Han ◽  
Guang Feng ◽  
Edward W. Hagaman ◽  
Lukas Vlcek ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Structural Properties ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids ◽  
Carbon Surfaces

The Microstructure of Diene Polymers. II. Polyisoprenes and Polybutadienes Prepared at High Pressures

1954 ◽  
Vol 27 (4) ◽  
pp. 958-961
Author(s):  
W. S. Richardson
Keyword(s):  
Free Radical ◽  
Hydrostatic Pressure ◽  
Chemical Reactions ◽  
Atmospheric Pressure ◽  
Room Temperature ◽  
High Pressures ◽  
Bulk Polymerization ◽  
Extensive Investigation ◽  
Very High ◽  
Increased Pressure

Abstract The rapid bulk polymerization of isoprene at room temperature under high hydrostatic pressure was apparently first observed by Bridgman and Conant. A more extensive investigation by Conant and Tongberg established the free radical nature of the polymerization (peroxide catalysis and hydroquinone inhibition). The latter workers also noted the solubility and elasticity of polymers made to moderate conversion and the insoluble crumbly nature (gelation) of the polymers made to very high conversion. In view of the well known effect of increased pressure in driving chemical reactions in the direction of the products of least specific volume, it is of interest to consider the possibility that diene polymers made at high pressures may be different in microstructure from polymers made at comparable temperatures but near atmospheric pressure.

Synthesis and chemical reactions of some conjugated heteroenoid compounds

1967 ◽  
Vol 45 (9) ◽  
pp. 1001-1006 ◽  
Author(s):  
R. F. Silver ◽  
K. Ann Kerr ◽  
Peggy D. Frandsen ◽  
Sheila J. Kelley ◽  
H. L. Holmes
Keyword(s):  
Chemical Reactions ◽  
Room Temperature ◽  
Cyano Group ◽  
Ethyl Cyanoacetate ◽  
Geometric Configuration ◽  
Cinnamic Acids ◽  
Active Methylene Compounds ◽  
Derivatives Of ◽  
Active Methylene

A series of 326 3-benzal-2,4-pentanediones, 2-benzal-1,3-indanediones, ethyl benzalaceto-acetates, diethyl benzalmalonates, ethyl benzalcyanoacetates, benzalmalononitriles, benzalcyanoacetamides, benzalcyanoacetanilides, benzalmalonamides, β-nitrostyrenes, β-nitropropenylbenzenes, β-nitrobutenylbenzenes, and derivatives of a number of cinnamic acids have been synthesized and their geometric configuration discussed. Aniline, p-toluidine, and n-butanethiol have been added to some of these compounds. The aniline adducts have also been prepared from benzylideneaniline and the active methylene compounds. The aniline adducts of those containing a cyano group are not stable and lose aniline at room temperature. The structure of the compound prepared from benzylideneaniline and ethyl cyanoacetate and melting at 140 °C has been established.

Synthesis, chemical properties, and U.V. spectra of thio-thionyl fluoride and difluorodisulphane

1967 ◽  
Vol 20 (11) ◽  
pp. 2305 ◽  
Author(s):  
RD Brown ◽  
GP Pez
Keyword(s):  
Benzoic Acid ◽  
Chemical Reactions ◽  
Hydrogen Fluoride ◽  
Half Life ◽  
Boron Trifluoride ◽  
Room Temperature ◽  
Chemical Properties ◽  
Life Time ◽  
First Order ◽  
Silver Fluoride

The preparation of difluorodisulphane, FSSF, by the silver fluoride/sulphur reaction is described. Difluorodisulphane is unstable at room temperature and rearranges spontaneously into thio-thionyl fluoride, SSF2. The largest observed first-order half-life time of FSSP gas was 4.7 hr at 21.8 � 0.3�. The decomposition of FSSF is catalysed by hydrogen fluoride and boron trifluoride. Chemical reactions of the isomers with AgF2, Cl2, BCl3, S2Cl2, acetone, benzoic acid, Pyrex, and quartz were studied. The absorption spectra of gaseous FSSF and SSF2 were recorded in the range of 10000 to 53000 cm-1. Medium to high intensity continua were noted with maxima for FSSF at 50200�250 and 41400�250 cm-1 and for SSF2 at 53000�500, 41400�250, and 33800�400 cm-1.

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