Voids nanostructures

Bernini R, DeNuccio E, Minardo A, Zeni L, Sarro PM (2008) Liquid-core/liquid-claddmg integrated silicon ARROW waveguides. Opt Commun 281 2062-2066 Almeida VR, Xu Q, Barrios CA, Lipson M (2004) Guiding and confining light in void nanostructures. Opt Lett 29 1209-1211... 

Among various preparation techniques of metal/alloy particles on the nanometre scale, the templating synthesis using microporous materials as microreactors is one of the promising methods [7, 10, 11]. Uniform void spaces of porous hosts work to synthesize nanostructured metal/aUoy particles as a guest, which are... 

The variety of porous solid materials that can be used as templates for nanostructure synthesis has been reviewed by Ozin (1992). In the template-assisted synthesis of nanowires, the pores or voids of the template are filled with the chosen material using a number of approaches. Nanowires have been derived via pressure injection, electrochemical deposition, and vapor deposition, as described in the following sections. 

A., Valette, S., and Fauchais, P. (2010) Quantification of void networks of as-sprayed and annealed nanostructured yttria-stabilized zirconia (YSZ) deposits manufactured by suspension plasma spraying. Surf. Coat. Technol., 205 (3), 683-689. 

Porous silicon (por-Si) formed by electrochemical etching of (llO)-oriented p-type Si wafers is an example of novel nanostructured medium with controllable optical properties. It was found to exhibit the strong in-plane birefringence (up to 18 %) and free-carrier dichroism [1-5]. Both phenomena originate from the form anisotropy of Si nanocrystals and voids assembling the material [3-5]. Below, we report the analysis of the dichroism in por-Si on the basis of the generalized effective-medium approximation (EMA) [7] as well as prominent anisotropy of absorption by silicon-hydrogen surface bonds. 

Nanostructured noble metal films (ex Ag) with thicknesses of <10 nm support plasmon oscillations. Such films are quasi-continuous and consist of isolated islands each of nanoscale diameter. These structures could therefore be modeled as 2D nanoisland lattices or as 2D photonic lattices of voids separating the islands. Brief iodization of these films causes a controlled depletion of electron density leading to a gradual disappearance of plasmons and a progressive buildup of excitons and valence band structure of Agl. The decay of plasmons in Ag is apparently closely connected with the buildup of electron-hole pairs in Agl as found in our recent iodization experiments. 

Figure 14.11 Design of CaO nanostructure (powder, pellet) considering the void volume available for expansion.

Zalusky et al. showed that mesoporous poly(styrene) scaffolds exhibit a limited thermal stability which results in the loss of the nanostructure features at temperatures well below the glass transition temperature of about 104 °C [35]. This is not surprising considering that the glass transition temperature is a concept that applies to bulk material. Similarly, voided DG-structured films prepared from P(F)S49- -... 

One goal of nanoscience in general and in the field of nanoporous materials " in particular is to achieve control over the architecture of matter on the nanoscale (1-100 nm). Because porous materials are divided into the subgroups microporous (voids smaller than 2 nm). mesoporous (voids between 2-50 nm). and macroporous (voids larger than 50 nm), it becomes obvious that these materials are raw models for nanostructured matter. Three... 

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