Homogeneity chemical composition

A common feature of all electrochemical pore formation processes in solid-state electrodes of a homogeneous chemical composition is the remarkable difference in dissolution rate between pore tip and pore wall. This is usually discussed in terms of an active-passive transition between the pore tip interface and the pore wall interface. But this still leaves the question open as to what quality of the pores makes their tips active and the remaining surface passive. On a basic level the active-passive transition has been ascribed to three distinct causes [Le31] ... 

For a sample of a homogeneous chemical composition, such as polymer lattices, Equation 12.30 can be rearranged in order to determine both particle diameter and sample density [22] ... 

A strict definition of a phase is a domain with a homogenous chemical composition and physical state (Atkins 1998). Typically, phase behavior is associated with equilibrium mixtures of hquid, vapor and solid phases in a mixture of two or more substances as a fimctiorr of temperature, pressure and compositiorr. hr fats, when discussing phases, it usually refers to their polymorphic form, sohd/hquid states, or compositionally differerrt ffactiorrs within a complex mixtrrre. Therefore, when phases of fats are discussed it is important to carefully define what is being used as the definition for... 

From a theoretical perspective, we would say that a single substance is one that has a homogeneous chemical composition. The problem is that many mixtures, such as air, sea water, orange juice and bronze, often appear uniform enough. We say they are homogeneous mixtures. 

The investigation of nanoparticles aggregation ratio influence on planar polyelectrolyte assemblies and microcapsules properties was carried out in paper. Gold nanoparticles prepared by chemical precipitation of gold chloride tryhidrate and sodium sulphide had an average diameter about 8 nm and homogeneous chemical composition in the whole volume. 

If the analyzed sohd is flat and smooth and has a homogeneous chemical composition, the contribution d/A of a layer of thickness dz, located at depth z, to the peak intensity of element A (Fig. 6 top), is given by... 

As a matter of fact, if the solid has a homogeneous chemical composition over the depth that contributes to the information, the peak intensity is given by... 

Considering a priori the probed zone as having a homogeneous chemical composition while the aim is to analyse a surface is somehow contradictory. However this is... 

A convenient basis for all that follows is obtained by looking at the modulus of a polymer material as a function of temperature. To obtain a basic representation, we consider the ideal case of a linear (unbranched) polymer chain of homogeneous chemical composition in a single phase bulk material which is amorphous (non-crystaUine). For all such materials, when modulus is plotted... 

Kassalainen and Williams [135] coupled thermal field flow fractionation (ThFFF) and matrix-assisted laser desorption/ionisation time-of-flight mass spectroscopy (MALDI-ToF-MS) to yield a powerful combination of techniques for the analysis of polydisperse PS. ThFFF high selectivity and sensitivity to chemical composition were used to separate polydisperse polymers and polymer mixtures into the narrow polydispersity and homogeneous chemical composition fractions essential for MAT.DT-ToF-MS analyses. On the other hand, because it is possible to measure directly using MALDI-ToF-MS, it alleviates the need for polymer standards for ThFFF. Kassalainen and Williams [135] address the coupling of ThFFF and MALDI-ToF-MS and identify compatibility issues. Optimum conditions were determined and developed to maximise the capabilities of the combined technique. Depending on the polymer and the method of matrix-assisted laser desorption/ionisation (MALDI) sample deposition, fractions from 1-10 ThFFF runs were combined for MALDI-ToF-MS analysis. Binary solvents are used to enhance ThFFF retention and resolution of low (<15 kDa) polymers, and methods developed to allow routine MALDI-ToF-MS analyses of PS polymers up to 575 kDa. Overall, the compatibility of the two techniques was extended from several kilodaltons to several hundred kDa. Polymer... 

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