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Urlic L.E. Florusse L.J. Straver E.J.M. Degrange S. Peters C.J. 《Transport in Porous Media》2003,52(2):141-157
This contribution reports on the phase and interfacial tension behavior of some model high-temperature–high-pressure gas condensates. On the one hand these types of gas condensate are becoming a subject of major interest for the oil industry, while on the other their phase and interfacial tension behavior have not been very well studied. For two different model gas condensates, both composed of the three n-alkanes, methane, butane, and decane, experimental results on their fluid phase behavior have been obtained in the temperature region 270 < T (K) < 490 and up to pressures as high as 24 MPa. Also, critical points of the two mixtures have been determined experimentally. Both mixtures show an extended retrograde region. Using the Peng–Robinson equation of state, the phase behavior of the two mixtures was modeled. In addition, the interfacial tension behavior of the model gas condensates was modeled. For that purpose, the Cahn–Hilliard theory was applied in combination with the Peng–Robinson equation of state. Satisfactory results were obtained. 相似文献
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Małgorzata Nowak Krystian Pluta Kinga Suwińska Leo Straver 《Journal of heterocyclic chemistry》2007,44(3):543-550
Reactions of 2,2′‐dichloro‐3,3′‐diquinolinyl sulfide 1 with ammonia derivatives and various primary alkylamines and arylamines proceeded as a thiazine ring closure to form linear annulated pentacyclic 6H‐diquinothiazine 2H and 6‐substituted derivatives 2 with alkyl, alkylaryl, aryl and heteroaryl substituents in moderate to good yields. Reaction with 2‐chloroethylamine did not stop at the formation of half‐mustard derivative 2k but ran to ethylenediquinothiazinium salt 11 . 6H‐Diquinothiazine 2H was N‐alkylated and N‐arylated to give 6‐substituted derivatives 2 . The crucial substrate 1 was obtained from other heteropentacenes 3 and 4 via 1,4‐dithiin ring opening and further transformations. X‐ray analysis of p‐nitrophenyldiquinothiazine 2i revealed unexpected planar thiazine ring. 相似文献
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Dr. Eberhardt Herdtweck Tobias Kornprobst Roland Sieber Leo Straver Johann Plank 《无机化学与普通化学杂志》2011,637(6):655-659
From hydrothermal synthesis needle‐shaped crystals of [Ca3(C6H5O7)2(H2O)2] · 2H2O were obtained. The crystal structure was determined by single‐crystal X‐ray experiments and confirmed by powder data (P$\bar{1}$ (no. 2) a = 5.9466(4), b = 10.2247(8), c = 16.6496(13) Å, α = 72.213(7)°, β = 79.718(7)°, γ = 89.791(6)°, V = 947.06(13) Å3, Z = 2, R1 = 0.0426, wR2 = 0.1037). The structure was obtained from pseudo merohedrically polysynthetic twinned crystals using a combined data collection approach and refinement processes. The observed three‐dimensional network is dominated by eightfold coordinated Ca2+ cations linked by citrate anions and hydrogen bonds between two non‐coordinating crystal water molecules and two coordinating water molecules. 相似文献
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Suwinska K Leśniewska B Wszelaka-Rylik M Straver L Jebors S Coleman AW 《Chemical communications (Cambridge, England)》2011,47(31):8766-8768
Twelve molecules of β-carbonyl-para-octyl-calix[4]arene assemble in an aggregate containing two types of cavities filled by water molecules and they pack in a cubic structure. Both the aggregates and the packing resemble that observed for inverse micelles. 相似文献
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In this paper an easy to fabricate SU8/glass-based microfluidic sensor is described with two closely spaced parallel electrodes for highly selective measurements using the redox cycling effect. By varying the length of the microfluidic entrance channel, a diffusion barrier is created for non-cycling species effectively increasing selectivity for redox cycling species. Using this sensor, a redox cycling amplification of ~6500× is measured using the ferrocyanide redox couple. Moreover, a simple, but accurate analytical expression is derived that predicts the amplification factor based on the sensor geometry. 相似文献
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