Beidellite

J. w. Geus, The interlayer collapse during dehydration of synthetic Na -beidellite a %a solid -state magic-angle spinning NMR study. Clays Clay Minerals. 25 457 (1992). 

Laponite XLG, provided by Laporte Chemicals ( ) and beidellite prepared in these laboratories (l ). (Magic angle spinning NMR along... 

Nagasawa, K., Noro, H. and Ito, M. (1981) Beidellite from the Seigoshi mine, Shizuoka Prefecture, Japan. Mineral. J 10, 233-240. 

Smectites are 2 1 charged layered silicates from natural (montmorillonite, hectorite, beidellite, saponite etc.) or synthetic (synthetic fluorohectorites, such as... 

However, when protonated TEMPAMINE adsorbs by cation exchange on fully hydrated layer silicate clays (10, 11), the spectrum becomes less symmetrical as shown in Figure 5. The beidellite and montmorillonite spectra have line shapes typical for nitroxide molecules with rotational frequencies on the order of 10 Hz (17). 

Weak rigid-limit spectra (labelled with arrows) and solution spectra (labelled with "s") are evident in beidellite and montmorillonite, respectively. 

For the relatively rapid anisotropic motion (tc < 3 x 10" s) of spin probes observed on fully hydrated smectites such as montmoril-lonite, hectorite, and beidellite, an external fixed axis system (x1, y, z ) can be defined in addition to the molecule-fixed axes (x, y, z). The angle, 0, between the z and z axes is given by ... 

Figure 6. Plot of TEMPAMINE hyperfine splitting as a function of orientation of the clay film (angle between plane of film and the applied magnetic field) for hectorite (O), montmorilIonite ( ) and beidellite (n).

Figure 9. ESR spectra of Na+-beidellite films with adsorbed TEMPAMINE equilibrated at 100% R.H., oriented at 0° and 90° to the applied magnetic field. Resonances attributed to rigid and mobile probes are denoted by "r" and "m", respectively.

Figure 13 depicts ESR spectra of Cu + in hydrated oriented beidellite films. The nearly symmetrical and orientation-independent nature of the spectra suggests that Cud O) "1" ions in the interlayer have mobility near that of CuCl COg ions in solution. In fact, the addition of excess water to these clays alters the Cu " " spectra to fully symmetrical peaks at g = 2.18 - 2.19. 

Only in the case of Na -beidellite were at least two different ligand environments of Cu + evident from the ESR spectra (Figure 17). This may indicate interstratification and the existence of interlayers with one and two layers of water. The g-values and hyperfine splittings for the rigid-limit spectra of Figures 15-17, as well as for previously studied minerals ( 7), are given in Table IV. 

Figure 17. ESR spectra of air-dry Cu +-doped beidellite films oriented at 0° and 90° to the applied magnetic field.

Beckman rearrangement TS-1 and TS-2 catalysts, 41 295 Beer s law, 34 209 Beidellite, idealized formula, 33 337 Bentonite, 27 173 Benzaldehyde... 

Pater, J.P.G., Jacobs, P.A., and Martens, J.A. (1998) 1-Hexene oligomerization in liquid, vapor and supercritical phases over beidellite and ultrastable Y zeolite catalysts. J. Catal., 179, 477. 

Three MER diagrams (Figs. 2, 3, 4) collectively illustrate the mineralogical controls observed in each of the Meguma Supergroup formations. Because these metamorphosed rocks derive from proximal and distal flysch sediments, they likely once contained quartz, K-feldspar, albite, muscovite, illite, smectite (montmorillonite-beidellite), chlorite... 

Catrinescu, C Teodosiu, C, Macoveanu, M Miehe-Brendle, J Le Dred, R. Catalytic wet peroxide oxidation of phenol over Fe-exchanged pillared beidellite. Water Research, 2003 37,1154-1160. 

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