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Leal Allan M. M. Kyas Svetlana Kulik Dmitrii A. Saar Martin O. 《Transport in Porous Media》2020,133(2):205-206
Transport in Porous Media - In the original publication of the article, Table 2 was published incorrectly. 相似文献
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Aarne Kasikov Alar Gerst Arvo Kikas Leonard Matisen Agu Saar Aivar Tarre Arnold Rosental 《Central European Journal of Physics》2009,7(2):356-362
The resistive response of atomic layer deposited thin epitaxial α-Cr2O3(0 0 1) films, to H2 and CO in air, was studied. The films were covered with Pt nanoislands formed by electron-beam evaporation of a sub-monolayer
amount of the material. The gas measurements were performed at 250°C and 450°C. These temperatures led to different proportion
of chemical states, Pt2+ and Pt4+, to which the Pt oxidized. The modification was ascertained by the X-ray photoelectron spectroscopy method. As a result of
the modification, the response was fast at 250°C, but slowed at 450°C. A disadvantageous abundance of Pt4+ arising at 450°C in air could be diminished by high-vacuum annealing thus restoring the response properties of the system
at 250°C.
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The nature of surface silanols is reviewed and their influence on retention of basic solutes in reversed phase chromatography is demonstrated and evaluated. The influence of the type of organic modifier and/or pH of buffer on retention of basic analytes with silica based RP columns is evaluated, and means for characterization of RP columns are discussed. Attempts are described to determine the surface silanol concentration of RP columns by chromatographic methods. Surprisingly the experimentally measured silanol concentrations with bare silica and with RP are by one order of magnitude lower than discussed in literature. At pH 7.6 values of 0.12 µmol m?2 have been measured for benzylamine with RP columns, corresponding to about 43% of the measurable silanols of plain silica. The break-through curves of amines let suggest that even at low pH values unprotonated species are present within the pores of the RP stationary phases and their interaction with the bonded alkyl groups contribute to retention. 相似文献
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R. Saar 《Fresenius' Journal of Analytical Chemistry》1930,79(1-2):70-72
Ohne Zusammenfassung 相似文献
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R. Saar 《Fresenius' Journal of Analytical Chemistry》1928,73(5-6):242
Ohne Zusammenfassung 相似文献
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We experimentally traced time evolution of phase fluctuation which occurred in the phase shift keying. 相似文献