Saturation characteristics of laser‐induced Na fluorescence in a propane‐air flame: The role of chemical reaction

1981 ◽  
Vol 52 (10) ◽  
pp. 6025-6031 ◽  
Author(s):  
M. Iino ◽  
H. Yano ◽  
Y. Takubo ◽  
M. Shimazu
Keyword(s):  
Chemical Reaction

On the Role of Diffusion in the Oxidation of Fe, Ni, Co and the Fe-Sn Alloy by Calcium and Sodium Sulfates

2006 ◽  
Vol 258-260 ◽  
pp. 63-67
Author(s):  
V.M. Chumarev ◽  
V.P. Maryevich ◽  
V.A. Shashmurin
Keyword(s):  
Co Oxidation ◽  
Chemical Reaction ◽  
Diffusion Processes ◽  
Transport Processes ◽  
Diffusion Transport ◽  
Sodium Sulfates ◽  
Product Forms ◽  
Kinetics Of ◽  
Dominant Part

Diffusion processes play a dominant part in the macro kinetics of Fe, Ni and Co oxidation by calcium and sodium sulfates. Here, the reaction product forms a compact covering which spatially divides the reagents on the surface in the same way as in the oxidation and sulfidization of metals by oxygen and sulfur. Therefore, it is possible to assume in advance that interaction of metals with calcium and sodium sulfates will be determined not by the actual chemical reaction properly but by the diffusion transport processes.

scholarly journals Graphene catalyzes the reversible formation of a C–C bond between two molecules

2018 ◽  
Vol 4 (12) ◽  
pp. eaau9366 ◽  
Author(s):  
J. J. Navarro ◽  
M. Pisarra ◽  
B. Nieto-Ortega ◽  
J. Villalva ◽  
C. G. Ayani ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Transition Metal ◽  
Chemical Reaction ◽  
Transition Metal Catalysts ◽  
Magnetic Switch ◽  
Kondo Resonance ◽  
Efficient Charge ◽  
Catalytic Role ◽  
Reversible Formation

Carbon deposits are well-known inhibitors of transition metal catalysts. In contrast to this undesirable behavior, here we show that epitaxial graphene grown on Ru(0001) promotes the reversible formation of a C–C bond between −CH2CN and 7,7,8,8-tetracyano-p-quinodimethane (TCNQ). The catalytic role of graphene is multifaceted: First, it allows for an efficient charge transfer between the surface and the reactants, thus favoring changes in carbon hybridization; second, it holds the reactants in place and makes them reactive. The reaction is fully reversible by injecting electrons with an STM tip on the empty molecular orbitals of the product. The making and breaking of the C–C bond is accompanied by the switching off and on of a Kondo resonance, so that the system can be viewed as a reversible magnetic switch controlled by a chemical reaction.

Substituent Effect on Reactivity of Alkyl Thiolacetates

1971 ◽  
Vol 26 (7) ◽  
pp. 703-707
Author(s):  
F. Dutka ◽  
A. F. Márton ◽  
P. Vinkler
Keyword(s):  
Chemical Reaction ◽  
Sulfur Atom ◽  
Substituent Effect ◽  
Linear Structure ◽  
Common Mechanism ◽  
Reaction Site ◽  
Structure Reactivity Relationship ◽  
Kinetics Of

Kinetics of catalyzed acyl group exchange between acetic-1-14C anhydride and alkyl thiolacetates was investigated. The exchange is not accompanied by chemical reaction and demonstrates the full equivalency of anhydride acyl groups in the process. The rate of exchange is lowered by increasing branching rather than lengthening in S-alkyl substituents. The role of catalyst and structures of possible intermediates are interpreted. Upon existing linear structure-reactivity relationship a common mechanism involving sulfur atom as the reaction site seems to be operative.

Interconversion between KSc2F7:Yb/Er and K2NaScF6:Yb/Er nanocrystals: the role of chemistry

2018 ◽  
Vol 47 (14) ◽  
pp. 4950-4958 ◽  
Author(s):  
Yangbo Wang ◽  
Bingxiao Yang ◽  
Kun Chen ◽  
Enlong Zhou ◽  
Qinghua Zhang ◽  
...  
Keyword(s):  
Chemical Reaction ◽  
Reaction Conditions

Interconversion between nanocrystals of orthorhombic KSc2F7:Yb/Er and cubic K2NaScF6:Yb/Er was realized by adjusting the according chemical reaction conditions.

Role of Slip Velocity on the Oscillatory Flow of Blood Through a Porous Vessel in the Presence of Heat Source and Chemical Reaction

2014 ◽  
Vol 30 (2) ◽  
pp. 209-218 ◽  
Author(s):  
A. Sinha ◽  
G. C. Shit
Keyword(s):  
Magnetic Field ◽  
Chemical Reaction ◽  
Slip Velocity ◽  
Oscillatory Flow ◽  
Internal Heat ◽  
Internal Heat Generation ◽  
Suction Velocity ◽  
Heat Generation Or Absorption ◽  
Nicolson Scheme

ABSTRACTOf concern in this paper is a problem motivated towards studying the influence of slip velocity on heat and mass transfer in the unsteady flow of blood through a porous vessel, when the lumen of the vessel has turned into a porous structure with internal heat generation or absorption in the presence of chemical reaction. It is assumed that the influence of a uniform magnetic field acts normal to the flow and the permeability of the porous medium fluctuates with time. The suction velocity is also taken to be oscillates periodically. The problem is solved numerically by using Crank-Nicolson scheme. The computational results are presented graphically for the velocity, temperature and concentration distribution as well as the variation of skin-friction co-efficient, Nusselt number and Sherwood number for various values of the parameters involved in this analysis. The study reveals that the flow is appreciably influenced by the presence of a magnetic field and slip velocity.

Sign in / Sign up

Export Citation Format

Share Document