Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Structure, layered materials

Let us note in addition that the layered sulfides M0S2 and WS2 have been found to form nanotubes and other fullerene-type structures, on account of their highly folded and distorted nature that favors the formation of rag and tubular structures. Such materials have been synthesized by a variety of methods [78] and exhibit morphologies, which were described as inorganic fiillerenes (IF), single sheets, folded sheets, nanocrystals, and nested IFs (also known as onion crystals or Russian dolls ). [Pg.36]

In general we describe structuring of materials by means of domains. Frequently such domains are sufficiently smooth, and thus surface as well as volume and mass are well-defined parameters. If in Sect. 8.3.2 we would have deduced Porod s law mathematically, we would have handled domain surfaces, shades and the lengths of chords intersecting these domains (e.g., crystalline layers). [Pg.142]

Layered materials are of special interest for bio-immobilization due to the accessibility of large internal and external surface areas, potential to confine biomolecules within regularly organized interlayer spaces, and processing of colloidal dispersions for the fabrication of protein-clay films for electrochemical catalysis [83-90], These studies indicate that layered materials can serve as efficient support matrices to maintain the native structure and function of the immobilized biomolecules. Current trends in the synthesis of functional biopolymer nano composites based on layered materials (specifically layered double hydroxides) have been discussed in excellent reviews by Ruiz-Hitzky [5] and Duan [6] herein we focus specifically on the fabrication of bio-inorganic lamellar nanocomposites based on the exfoliation and ordered restacking of aminopropyl-functionalized magnesium phyllosilicate (AMP) in the presence of various biomolecules [91]. [Pg.248]

Structurally, the materials are grouped into two main classes, those (soft carbons) with predominantly stacked layers (CRO, KS and PVC) and those (hard carbons) which have significant amounts of single layer sheets (OXY and ENR). All the samples show similar values of La when heated to a given temperature. [Pg.387]

Most plastics react chemically with chlorine because of their hydrocarbon structural makeup. This reactivity is avoided with some plastics in which fluorine atoms nave been substituted into the hydrocarbon molecule. The Chlorine Institute recommends that hoses constructed with such an inner lining "have a structural layer braid of polyvinyli-dene fluoride (PVDF) monofilament material or a structural braid of Hastelloy C-276. An underlying lesson here is material compatibility. Material compatibility tables exist that engineers can consult, including in other sections within this volume. [Pg.6]

Once the structural support layers have been fabricated by extrusion or EPD for tubular cells or by tape casting or powder pressing for planar cells, the subsequent cell layers must be deposited to complete the cell. A wide variety of fabrication methods have been utilized for this purpose, with the choice of method or methods depending on the cell geometry (tubular or planar, and overall size) materials to be deposited and support layer material, both in terms of compatibility of the process with the layer to be deposited and with the previously deposited layers, and desired microstructure of the layer being deposited. In general, the methods can be classified into two very broad categories wet-ceramic techniques and direct-deposition techniques. [Pg.256]

V. A. Russell, M. C. Etter, M. D. Ward, "Layered materials by molecular design structural enforcement by hydrogen bonding in guanidinium alkane- and arenesulfo-nates , J. Am. Chem. Soc 1994,116,1941-1952. [Pg.233]

Structural aspects of these nanoparticles are also discussed in this chapter. Extensive mathematical research has been devoted to polyhedramade of a single layer (13). Surprisingly, however, mathematical analysis of polyhedra and nanotubular structures made of two interconnected layers and more has started only very recently, as a result of the discovery of IF phases [see, e.g., (14)]. Most of the inorganic layered materials are comprised of more than one atomic layer, with strong chemical bonds interconnecting between the atoms of the different layers. Therefore a mathematical analysis of multilayer polyhedra is called for. [Pg.272]

Kotov, N.A. (2003) in Multilayer Thin Films Layer-by-Layer Assembly of Nanoparticles and Nanocolloids Intermolecular Interactions, Structure and Materials Perspectives (eds G. Decher and B.J. SchlenofF), Wiley-VCH, Weinheim. [Pg.111]

Figure 5.20 Structure of colour variable pigments and possible combinations of layer materials. Figure 5.20 Structure of colour variable pigments and possible combinations of layer materials.
Grasso V (1986) Electronic Structure and Electronic Transitions in Layered Materials, D Reidel, Dordrecht... [Pg.202]


See other pages where Structure, layered materials is mentioned: [Pg.544]    [Pg.109]    [Pg.578]    [Pg.544]    [Pg.681]    [Pg.544]    [Pg.109]    [Pg.578]    [Pg.544]    [Pg.681]    [Pg.1694]    [Pg.416]    [Pg.48]    [Pg.32]    [Pg.220]    [Pg.239]    [Pg.243]    [Pg.247]    [Pg.404]    [Pg.450]    [Pg.505]    [Pg.107]    [Pg.187]    [Pg.130]    [Pg.252]    [Pg.270]    [Pg.378]    [Pg.66]    [Pg.124]    [Pg.41]    [Pg.254]    [Pg.254]    [Pg.457]    [Pg.408]    [Pg.99]    [Pg.139]    [Pg.21]    [Pg.132]    [Pg.500]    [Pg.72]    [Pg.78]   
See also in sourсe #XX -- [ Pg.6 , Pg.7 ]




SEARCH



Layer structures

Layered materials

Layered structure

Layering structuration

Material structure

© 2024 chempedia.info