Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Potentials, distinguishing between types

A distinction between the four compositions in Table 3 cannot be made on the basis of the results in Table 1. However, the results in Fig. 39 demonstrate [65] that CO d and C HpOq are not identical. There are two types [59, 66] of CO d as marked for curve a in Fig. 39. Type II species are oxidized at less anodic potentials than type I. The arrest of the oxidation of type I species is located close to the arrest of the oxidation of CgHpOq at a given temperature between 0° and 40°C. The difference in potential between corresponding arrests at the same temperature is not sufficient to distinguish between type I species of CO d and C HpOq But such a distinction can be made on the basis of the temperature dependence. The potential region of the arrest of the oxidation of type I species of CO d decreases more rapidly with temperature than that of CgHpOq. The determination [65] of the experimental heat of activation [67] A /f ref 0-6 V according to Eq. 32. [Pg.139]

While the redox potentials of Rieske clusters are above -1-100 mV at pH 7, values between 100 and 150 mV have been determined for the redox potentials of Rieske-type clusters (Table XI). Several 4-cysteine coordinated [2Fe-2S] clusters have redox potentials similar to those of Rieske-type clusters, for example, the [2Fe-2S] clusters of the dioxygenase reductases [compilation in (104)]-, therefore, the redox potential is not useful for distinguishing between Rieske-type and ferredoxin-type clusters. [Pg.142]

Regarding the electrode/electrolyte interface, it is important to distinguish between two types of electrochemical systems thermodynamically closed (and in equilibrium) and open systems. While the former can be understood by knowing the equilibrium atomic structure of the interface and the electrochemical potentials of all components, open systems require more information, since the electrochemical potentials within the interface are not necessarily constant. Variations could be caused by electrocatalytic reactions locally changing the concentration of the various species. In this chapter, we will focus on the former situation, i.e., interfaces in equilibrium with a bulk electrode and a multicomponent bulk electrolyte, which are both influenced by temperature and pressures/activities, and constrained by a finite voltage between electrode and electrolyte. [Pg.129]

There are two types of differential scanning calorimeters (a) heat flux (AT) and (b) power compensation (AT). Subsequent sections of this experiment will not distinguish between the two types. In either type of calorimeter, the measurement is compared to that for a reference material having a known specific heat [16,17], As AT and AT have opposite signs there is some potential for confusion [3], e.g., at the melting point, Tm, Ts < Tr, and AT < 0, whereas Ts > Tr and AT > 0 because latent heat must be supplied (subscripts s and r refer to the sample and the reference material, respectively) [3]. [Pg.120]

Surface Pressure, Potential, and Fluidity Characteristics for Various Interactions in Mixed Monolayers. It is possible to distinguish various types of interactions which occur in mixed monolayers by measuring the surface pressure, surface potential, and surface fluidity of the monolayers. Deviation from the additivity rule of molecular areas indicates either an interaction between components or the intermolecular cavity effect in mixed monolayers. [Pg.202]

The resonance spectrum reflects the openness of the potential. We may distinguish between different types of potentials ... [Pg.538]

The many possibilities of directing the physical/chemical properties of a den-drimer by introduction of selected functional groups into the molecule lead to an great variety of potential applications of dendrimers. Depending upon the position and the nature of the functional units within the dendrimer structure, it is possible to distinguish between different types of functional dendrimers ... [Pg.49]

Both techniques in principle bear the potential to distinguish between p- and n-type conductors and—if applicable to ion conductors—to distinguish between interstitial and vacancy contribution provided the nature of the mobile ion is known. [Pg.120]

A system of this type is not holistic, but partially holistic, which means that pairwise interaction occurs between the holistic units. The distinction drawn here between holistic and partially holistic systems is not in line with the terminology used in general philosophic discourse and in order to avoid any confusion it is preferable to distinguish between systems that interact either continuously, or discontinuously, with the quantum potential field. Quantum potential, like the gravitational potential, occurs in the vacuum, presumably with constant intensity. The quantum potential energy of a quantum object therefore only depends on the wave function of the object. [Pg.112]


See other pages where Potentials, distinguishing between types is mentioned: [Pg.314]    [Pg.603]    [Pg.24]    [Pg.455]    [Pg.122]    [Pg.201]    [Pg.3]    [Pg.71]    [Pg.267]    [Pg.187]    [Pg.711]    [Pg.593]    [Pg.514]    [Pg.338]    [Pg.109]    [Pg.109]    [Pg.88]    [Pg.410]    [Pg.125]    [Pg.165]    [Pg.53]    [Pg.39]    [Pg.297]    [Pg.55]    [Pg.188]    [Pg.494]    [Pg.538]    [Pg.173]    [Pg.547]    [Pg.60]    [Pg.497]    [Pg.443]    [Pg.155]    [Pg.15]    [Pg.386]    [Pg.207]    [Pg.299]    [Pg.63]    [Pg.209]    [Pg.1041]    [Pg.112]   
See also in sourсe #XX -- [ Pg.538 ]




SEARCH



Distinguishable

© 2024 chempedia.info