Surface Tension of Nitric Oxide and Its Binary Mixtures with Krypton, Methane, and Ethene
✍ Scribed by Jorge Carreira Gonçalves Calado; Ângela Filomena Simões dos Santos Mendonça; Benilde de Jesus Vieira Saramago; Virgı́lio Alberto Meira Soares
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 221 KB
- Volume
- 189
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
In recent years, there has also been considerable interest The surface tension of three binary liquid mixtures of NO in the physical chemistry of binary liquid mixtures in which with Kr, CH 4 , and C 2 H 4 has been determined as a function of the molecules of one component can associate between composition in the temperature range 102.0 to 119.0 K. These themselves. Nitric oxide is a good example because it is measurements are a contribution to the study of binary liquid known to be virtually unassociated in the gaseous state, but mixtures in which one component is unassociated while the wholly dimerized in the solid and partially associated in the molecules of the other can associate between themselves. Nitric liquid. The mixtures of nitric oxide with krypton, methane, oxide is the simplest molecule capable of forming dimers, but and ethene are, perhaps, the simplest liquid mixtures of this not larger aggregates. This results in the surface tension of liqkind and so they should provide suitable results to compare uid nitric oxide having a strong temperature dependence: when the temperature increases the degree of dimerization decreases, with theory. It was these considerations that led us to detercontributing to a larger decrease of the surface tension. The mine the surface tension of those three binary mixtures over surface tension of NO mixtures shows strong deviations from a range of temperature using the differential capillary rise ideality. The mixtures containing Kr and CH 4 exhibit negative technique. The tendency of the nitric oxide molecules to deviations, while for the NO / C 2 H 4 system the surface tension form dimers is due to the presence of an unpaired p electron; shows a complex dependence on the composition. This strong the pairing of these electrons in the dimer prevents the fordeparture from ideality had already been found for the bulk mation of higher order aggregates.
properties of these three systems. The surface tension of the In addition, we repeated the measurements, already re-CH 4 / Kr system, already well characterized in the literature, ported in the literature (Fuks and Bellemans (2)), of the was also measured to test our equipment.