Layered metal hydroxides

Layered metal hydroxides can be categorized into several classes according to their structure (Figure 13.1). Layered double hydroxides (LDHs), which have a hydrotalcite-like structure [27-34], can be expressed as [M2+1 xM3+x(0H)2] (Am )x/m,nH20,... 

Effects of Hydroxy Double Salts and Related Nanodimensional-Layered Metal Hydroxides on Polymer Thermal Stability... 

The heat release rate curves shown in Fig. 4A are consistent with the characteristic burning patterns of intermediate thick, non-charring samples (II). The PHRR values for PE-ZCHS-5 and PE-ZCHS-10 nanocomposites are reduced by 27 and 25% relative to the pure PE respectively. For smectite clay/polymer nanocomposites, reduction in PHRR has been shown to be correlated with nanodispersion of the additive in the polymer matrix (72). With HDS and related layered metal hydroxide additives, we have also only found PHRR reduction in the case of PVE with CHDS, a system with some... 

Many investigators have searched the mineral world for possible catalysts of biogenic reactions. Suggestive results have been obtained with metal ions, zinc for example (Lohrmann et al., 1980), clays (Cairns-Smith, 1982 Ferris, 1998), double-layer metal hydroxide minerals (Pitsch et al., 1995), pyrite (Wachtershauser, 1998), and iron-sulfur complexes (Cammack, 1983 Wachtershauser, 1998). To what extent such materials may have been crucial to the origin of life on earth is, however, not known. In addition, doubts have often been expressed that mineral catalysts could, alone, have sufficed to launch life. 

Figure 20.2 Schematic of the double-layered metal hydroxide structure of a typical hydrotalcite. Reproduced with permission from Ref [8].

Choy JH, Kwak SY, Park JS, Portier J. Intercalative nanohybrids of nucleoside monophosphates and DNA in layered metal hydroxide. J Am Chem Soc May 1999 121 1399-400. 

Borja, M. Dutta, P.K. Fatty-acids in layered metal-hydroxides membrane-like structure and dynamics. 7. Phys. Chem. 1992, 96, 5434-5444. 

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