Window diameter

Zeolite/zeotype Structure type code No. of tetrahedra in ring Window diameter (pm) Cavity diameter (pm)... 

Spectra of other dynamical variables like CoM velocities and zeolite window diameters can also be obtained by Fourier transformation of the appropriate time correlation functions. Calculation of spectra for different spatial components of a time dependent quantity provides useful information about the anisotropy of the corresponding motion. 

Fig. 4.2 The sealing arrangement of the high-pressure optical window (HP) high pressure (AP) ambient pressure d, the window diameter and dj the diameter of the area available for the passage of beam.

The microkinetic interpretation of the origin of these different patterns may be confirmed by molecular dynamics (MD) simulations. As an example. Fig. 11 presents the result of an MD study with methane in a cation-free zeolite of type LTA [117,118]. By increasing the Lennard-Jones distance a between the methane molecules and the oxygen of the zeolite lattice one is able to simulate the influence of a reduction of the window diameter on the dif-... 

As a consequence of the much smaller window diameters, window blocking in zeolite A is easier to be achieved than in zeolite X. However, there are examples, where the co-adsorption of a second molecular species (e.g., water... 

MOFs Formula BET surface area (mVg) Pore/channel diameter (A) Window diameter (A) Open metal sites. Thermostability (°C) Moisture ... 

More complicated are sample environments suitable for catalysis and electro-chemistry. For such combined experiments the requirements on the sample environment can at time be rather complicated. If for instance one would like to perform catalysis experiments under realistic conditions, i.e. under flow and pressures in excess of 20 Bar, with a Ti functionalised catalyst one is faced with the problem that the windows should be both thin as well as be able to withstand the pressure. In transmission XAS this is still feasible, by choosing small window diameters, but once one incorporates... 

Sbet bet surface area Cbet BET constant Vt total pore volume dceu cell diameter (BdB-FHH method) window diameter (BdB-FHH method). 

In Table 11.1, the cutoff is the wavenumber for which the percent transmission is 50% when the thickness of the window is 4 mm. The yield strength, P, is for a window 25 mm in diameter and 1 mm thick window with a safety factor of 4. To calculate the thickness, T, required for a given window diameter, D, subjected to a pressure, P, the following formula should be used ... 

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