Molecular sieving MFI-type zeolite membranes were prepared by a secondary growth method without using an organic template. Silicalite membranes with intercrystalline pores minimized or eliminated were obtained by this synthesis method which avoids the template removal step. The silicalite membrane exhibits molecular sieving characteristics with pervaporation separation factor for p-xylene to o-...

We have performed in situ quasielastic neutron scattering (QENS) measurements on zeolite-guest systems under microwave irradiation, for comparison with corresponding simulations. Both experiment and simulation reveal selective heating of methanol in silicalite, but little to no heating of benzene in silicalite. Effective translational and rotational temperatures extracted from QENS data under m...

In this work, we developed a new amperometric biosensor for glutamate detection using a typical method of glutamate oxidase (GlOx) immobilization via adsorption on silicalite particles. The disc platinum electrode (d = 0.4 mm) was used as the amperometric sensor. The procedure of biosensor preparation was optimized. The main parameters of modifying amperometric transducers with a silicalite lay...

The application of silicalite for improvement of enzyme adsorption on new stainless steel electrodes is reported. Glucose oxidase (GOx) was immobilized by two methods: cross-linking by glutaraldehyde (GOx-GA) and cross-linking by glutaraldehyde along with GOx adsorption on silicalite-modified electrode (SME) (GOx-SME-GA). The GOx-SME-GA biosensors were characterized by a four- to fivefold highe...

The downscaling of feature sizes in integrated circuits (IC) requires on-chip interconnects with low dielectric constant layers (low-k) that mitigate the increase in propagation delay and power consumption. Several candidate low-k materials based on porous silicates have been proposed. Whereas porosity is beneficial for lowering the dielectric constant, it has detrimental effects on the mechani...

0021-9517/$ see front matter 2009 Elsevier Inc. A doi:10.1016/j.jcat.2009.10.015 * Corresponding author. Address: Goesmann 222, Amherst, MA 01003-9336, USA. Fax: +1 413 545 4490 E-mail addresses: [email protected] (V. Ag (G.W. Huber), [email protected] (W.C. Conner edu (S.M. Auerbach). We have performed embedded-cluster calculations using density functional theory to investigate mechan...

A detailed study of the luminescence decay curves of pyrene included within p-tert-butylcalix[4]arene cavities and benzophenone into silicalite channels is reported. A new methodology for a lifetime distribution analysis of the decay curve of probes onto heterogeneous surfaces is presented, which allows for asymmetric distributions and uses Voigt profiles (Gaussian and Lorentzian mixture) inste...

We have performed molecular dynamics (MD) simulations of zeolite-guest systems driven by microwaves (MW), to study how energy is distributed in these systems as a function of guest loading. Expanding on a previously published communication [Blanco, C.; Auerbach, S. M. J. Am. Chem. Soc. 2002, 124, 6250.], we have found that MW-driven MD with the Andersen thermostat gives robust steady states, wh...

This study evaluated Al-ZSM-5 nanocrystals grown from silicalite-1 seed crystals as catalysts for the methane dehydroaromatization (MDA) reaction. Silicalite-1 sized between 30 and 40 nm were used to grow under various synthesis conditions. The size of was significantly affected by Si/Al ratio (SAR), time, silica nutrients/seed crystal (NSR). Larger obtained with an increased SAR in sols. Gradu...

The influence of the particle ‘‘memory’’ on long-range diffusion in the channel network of silicalite is taken into account by considering pairs of subsequent steps between the channel intersections. It is shown that in this case the correlation rule between the principal elements of the diffusion tensor has to be modified by including an additional term, which takes account of the deviation of...