Chemical Reactivity in AOT Microemulsions:  Kinetics of Water Replacement in a Square-Planar Palladium(II) Aquo Complex by Monoalkylthioureas

1998 ◽  
Vol 102 (17) ◽  
pp. 3143-3146 ◽  
Author(s):  
F. Paolo Cavasino ◽  
Carmelo Sbriziolo ◽  
M. Liria Turco Liveri
Keyword(s):  
Chemical Reactivity ◽  
Aquo Complex ◽  
Square Planar ◽  
Water Replacement ◽  
Kinetics Of

Thermal decomposition kinetics of square-planar d8 bis(N-monosubstituted-dithlocarbamato)metal(II) complexes

1989 ◽  
Vol 149 ◽  
pp. 331-340 ◽  
Author(s):  
G.A. Katsoulos ◽  
M. Lalia-Kantouri ◽  
C.C. Hadjikostas ◽  
P. Kokorotsikos
Keyword(s):  
Thermal Decomposition ◽  
Decomposition Kinetics ◽  
Thermal Decomposition Kinetics ◽  
Square Planar ◽  
Kinetics Of

scholarly journals Dependence of track etching kinetics on chemical reactivity around the ion path

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
S. A. Gorbunov ◽  
R. A. Rymzhanov ◽  
A. E. Volkov
Keyword(s):  
Chemical Reactivity ◽  
Quantitative Description ◽  
Sample Surface ◽  
Numerical Approach ◽  
Heavy Ion ◽  
Ion Trajectory ◽  
Track Etching ◽  
Wet Chemical ◽  
Kinetics Of ◽  
Account Variation

Abstract Etching kinetics of swift heavy ions (SHI) tracks in olivine is investigated in frame of experimentally verified numerical approach. The model takes into account variation of induced chemical reactivity of the material around the whole ion trajectory with the nanometric accuracy. This enables a quantitative description of wet chemical etching of SHI tracks of different lengths and orientations towards to the sample surface. It is demonstrated that two different modes of etching, governed by diffusion of etchant molecules and by their reaction with the material must be observed in experiments using techniques with different resolution thresholds. Applicability limits of the optical microscopy for detection of heavy ion parameters by measuring of the lengthwise etching rates of the ion track are discussed.

Comparison of the Chemical Reactivity and Bioactivity of Two Bioactive Glasses 47S6 and 48S4

2008 ◽  
Vol 396-398 ◽  
pp. 107-110 ◽  
Author(s):  
Hassane Oudadesse ◽  
M. Mami ◽  
R. Dorbez-Sridi ◽  
P. Pellen-Mussi ◽  
F. Perez ◽  
...  
Keyword(s):  
Mineral Composition ◽  
Chemical Reactivity ◽  
Rapid Quenching ◽  
Structural Basis ◽  
In Vitro Experiments ◽  
Layer Formation ◽  
Bioactive Glasses ◽  
Ionic Exchanges ◽  
Kinetics Of

This work is focused on the bioactive glasses obtained by melting and rapid quenching. Two glasses with mineral composition of: 47% SiO2 - 26% CaO - 21% Na2O - 6% P2O5 and 48% SiO2 - 30% CaO - 18% Na2O - 4% P2O5 were investigated. The aim of this study was to establish the kinetics of HCAp layer formation “in vitro” and to control the adhesion and proliferation cells of the two glasses in contact with osseous cells. Obtained results permit to evaluate their chemical reactivity and their bioactivity after immersion in the SBF-K9. Ionic exchanges between biomaterials and SBF liquid during the “in vitro” experiments highlight the differences of the chemical reactivity and bioactivity of 47S6 and 48S4. The structural basis for the effect of cristallinity on the rates of HCA formation in vitro in favour of glasses was also established. The melt derived 47S6 and 48S4 glasses offer to surgeons new compositions with different bioactivity kinetic that bioglassÒ 45S6 and can be adaptable in some other bony pathology.

STOCHASTIC SEARCH PROCESSES AND CHEMICAL REACTIVITY IN HETEROGENEOUS MEDIA

2009 ◽  
Vol 19 (10) ◽  
pp. 3519-3524
Author(s):  
M. MOREAU ◽  
O. BÉNICHOU ◽  
C. LOVERDO ◽  
R. VOITURIEZ
Keyword(s):  
Reaction Kinetics ◽  
Molecular Motors ◽  
Heterogeneous Media ◽  
Chemical Reactivity ◽  
Search Time ◽  
Lower Probability ◽  
Biological Cell ◽  
Intermittent Behavior ◽  
Search Processes ◽  
Kinetics Of

Intermittent search processes alternate between two different stochastic motions in order to reach a given target. If the faster motion has a lower probability to detect the target, a question arises concerning the efficiency of both processes, and it may be possible to minimize the search time by a convenient choice of the parameters. This argument has been used to interpret observations in molecular biology or to explain the behavior of animals when searching for food. It can also have interesting consequences for the kinetics of reactions in heterogeneous media. In particular, the reaction kinetics in a biological cell can be enhanced when the active molecules occasionally bind to molecular motors that inactivate their reactivity and carry them far away. Here, we present a synthesis of the recent results obtained on these topics, with new perspectives and possible applications of intermittent behavior in reaction kinetics to be soon developed.

Dislocations and the thermal reactivity of calcite

1970 ◽  
Vol 314 (1518) ◽  
pp. 429-441 ◽  
Keyword(s):  
Chemical Reactivity ◽  
Previous History ◽  
Strain Fields ◽  
Temperature Range ◽  
Reactivity Of Solids ◽  
Dislocation Movement ◽  
History Of ◽  
First Time ◽  
Kinetics Of

A study has been made of the effect of dislocation movement on the kinetics of thermal decomposition of freshly cleaved calcite crystals. It is shown for the first time that the thermal history of the crystal has a marked effect on its reactivity and two patterns of behaviour have been identified; that in the temperature range up to ca . 700 K in which the kinetics of decomposition are sensitively dependent upon the nature and extent of the crystal’s previous history, and the range above 700 K in which annealing is rapid and reproducible kinetics are obtained for all crystals studied. This effect has not been observed in previous studies of calcite. It is suggested that this is because the experiments were carried out in the temperature range where movement of dislocations is so rapid that the surface structure is virtually constant during the measurements. Tentative correlations are made between the various stages of the observed rates of decomposition and the known dislocation systems in the crystal. The influence of applied stress was studied but because of limitations in the method of stressing the crystal, the amount of plastic deformation was small and its effect on reactivity was not marked. Qualitative consideration is given to the role of dislocations in the reactivity of solids and it is concluded that the elastic energy associated with the strain fields around or at the core of the dislocation cannot be used to promote chemical reactivity but that it is the change in the stereochemical environment of molecules in the dislocated region of the crystal which is important. ‘ . . . a curious illustration of the influence of mechanical forces over chemical affinity. . . ’ M. Faraday (1834)

Sign in / Sign up

Export Citation Format

Share Document