Volume second phase

For methyl alcohol, two volumes of synthetic n-hexane, b.p. 68-6-69 0° (uncorr.), and one volume of the alcohol to be tested are mixed and the homogeneous mixture is cooled in ice until the appearance of a cloudiness. A thermometer is placed in the solution, which is allowed to warm gradually to the temperature at which the second phase disappears. The... 

MnAs exhibits this behavior. It has the NiAs structure at temperatures exceeding 125 °C. When cooled, a second-order phase transition takes place at 125 °C, resulting in the MnP type (cf. Fig. 18.4, p. 218). This is a normal behavior, as shown by many other substances. Unusual, however, is the reappearance of the higher symmetrical NiAs structure at lower temperatures after a second phase transition has taken place at 45 °C. This second transformation is of first order, with a discontinuous volume change AV and with enthalpy of transformation AH. In addition, a reorientation of the electronic spins occurs from a low-spin to a high-spin state. The high-spin structure (< 45°C) is ferromagnetic,... 

The high surface-to-volume ratio can also significantly improve both thermal and mass transfer conditions within micro-channels in two ways firstly, the convective heat and mass transfers, which take place at the multi-phase interface, are improved via a significant increase in heat and mass transfer area per unit volume. Secondly, heat and mass transfers within a small volume of fluid take a relatively short time to occur, enabling a thermally and diffusively homogeneous state to be reached quickly. The improvement in heat and mass transfer can certainly influence overall reaction rates and, in some cases, product selectivity. Perhaps one of the more profound effects of the efficient heat and mass transfer property of micro-reactors is the ability to carry potentially explosive or highly exothermic reactions in a safe way, due to the relatively small thermal mass and rapid dissipation of heat. 

The pharmacokinetic parameters of octane are more like those of dieldrin than DDT while the clearance of all three of these compounds is somewhat greater than that of PAH. While the initial half life of DEHP is longer (36 min.) than any other compound in Table VI, its second phase t is rapid (3 hrs.) while the is equal to that of the plasma volume. The clearance of DEHP isu about one-half that of PAH. 

Although the terms nanocomposite and hybrid are often used to define similar materials, we will use the classification indicated by Vilatelaand Eder [1], Nanocomposites are multiphase materials, in which one phase is dispersed in a second phase, resulting in a combination of the individual properties of the component materials. The volume fraction of the nanocarbon is typically less than a few percent. Nanocarbon hybrids are instead formed by both components with similar volume fractions. The inorganic compound (such as semiconductor nanoparticles) is deposited onto the surface of the... 

Preparative MPLC. Solid phase Lichroprep RP18 40-60 pm (Merck KGaA, Darmstadt, Germany), first gradient 5 5 % acetonitrile against 1 mM ammonium formate (six column volumes), second gradient 5-50 % acetonitrile with 1 mM formic acid as the aqueous phase. 

In the simplest case, such a system consists of two phases with the same volume. One of them (phase 1) contains KCl in concentration Ci and the potassium salt of a macromolecular anion, KX, in concentration cx The second phase consists only of a KCl solution with concentration c. The system can be depicted by the scheme... 

Another distinctive characteristic of the PLZT materials is their fully dense, pore-free microstructure which is devoid of any second phases. This is reflected in measured bulk densities which routinely exceed 99.9% of theoretical density. The existence of pores or second phases in the volume of the grains or in the grain boundaries is undesirable since both act to increase light scattering and reduce optical transparency. 

Initially, the second phase predominates and the smaller polymer in monomer phase is dispersed in the larger rubber in monomer phase. However, as polymerization proceeds, the polymer in monomer phase becomes greater in volume. 

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