Abstract C 30 H 72 N 10 O 7 S 2 , triclinic, P 1̄ (no. 2), a = 8.75510(10) Å, b 15.1170(2) c 16.8843(2) α 76.272 ( 1 ) ° $76.272(1){}^{\circ}$ β 78.397 $78.397(1){}^{\circ}$ γ 88.277 $88.277(1){}^{\circ}$ V...

Zeolites have found widespread applications as catalysts and separation media. A L present, all technologies exploiting these materials use the zeolite in powder composite form. The desire to translate the molecular sieving properties of zeolite powder composites into a membrane configuration has long been recognized. To prepare such a membrane, the crystals must grow in an interlockng fashion ...

Abstract C 17 H 37 N 9 O 3 S 2 , monoclinic, P 1 / c (no. 14), a = 8.8492(13) Å, b 17.285(3) 16.810(3) β 93.493(2)°, V 2566.4(7) Å Z 4, R gt ( F ) 0.0395, wR ref 0.1277, T 296(2) K.

Zeolites are microporous aluminosilicates with well-defined channels and cavities. They have been widely used as ionexchangers, molecular sieves, sorbents, and catalysts. The stability of zeolites is crucial to their applications. Many experimental and theoretical studies have been concentrated on their thermal stability. On the contrary, their behavior under external high pressures has receive...

Tetraethyl-, tetrapropyl-, and tetrabutylammonium ions are capillary-active on the interface water-mercury. In the adsorbed state they increase Brdicka and presodium currents. These currents drop sharply at potentials where tetrabutylammonium ions are desorbed, these potentials being -1.60, -1.66, -1.72, and -1.79 V versus the saturated calomel electrode (SCE) at tetrabutylammonium concentratio...

The purpose of this work is the synthesis of 2,3-butanedione (diacetyl) by selective oxidation of 2-butanone (methyl ethyl ketone) in the presence of O2 and H2O2 30% as oxidants. All the tests were performed over several selective oxidation zeolite catalysts, synthesized and characterized in our laboratory. Introduction 2,3-Butanedione or diacetyl, a flavor compound having a distinct buttery ch...

We examined block of two inward-rectifier K 1 channels, IRK1 and ROMK1, by a series of intracellular symmetric quaternary alkylammonium ions (QAs) whose side chains contain one to five methylene groups. As shown previously, the ROMK1 channels bind larger QAs with higher affinity. In contrast, the IRK1 channels strongly select TEA over smaller or larger QAs. This remarkable difference in QA sele...

Ion mobility spectrometry (IMS) consists of an analytical technique that can separate gas phase ions based on their size, shape and polarizability [1]. In turn, the mobility can be used to determine the collision cross section (Ω), which is a measure of an ion’s conformation in the gas phase. As the number of collisions is dependent on the conformations of an analyte, ions of identical composit...

We studied block of the internal pore of the ROMK1 inward-rectifier K 1 channel by Mg 2 1 and five quaternary ammoniums (tetramethylammonium, tetraethylammonium, tetrapropylammonium, tetrabutylammonium, and tetrapentylammonium). The apparent affinity of these blockers varied as a function of membrane voltage. As a consequence, the channel conducted K 1 current more efficiently in the inward tha...

The acidity and hydrothermal stability of mesoporous aluminosilicates (MesoAS) are relatively low compared to those of zeolites, which limits their potential applications as catalysts in petroleum refining and fine chemicals synthesis.[1±7] Much effort has therefore been undertaken to synthesize a new type of materials, which combines the advantages of both zeolites and mesoporous molecular sie...