Nanocomposites optical

These few examples show how the use of nanocomposite systems with hetero polysiloxane type of matrices leads to interesting properties for applications. Further developments using these basic systems are transparent controlled release coatings for anti-fogging systems [41], anti-corrosive systems for metal protection [42], and nanocomposite optical bulk materials [43],... 

Lii, C. L., Cheng, Y. R., Liu, Y. R, Liu, R, and Yang, B. 2006. A facile route to ZnS-polymer nanocomposite optical materials with high nanophase content via y-ray irradiation initiated bulk polymerization. Adv. Mater. 18 1188-1192. 

Borders J, McGovern MR. Cyclic olefin Polymeric Nanocomposite Optical Plastic Article and Method of making same. U.S. Patent 6552111, www.patentstorm.us/patents/ 6552111/fulltext.html April 22, 2003. www.malvem.com/LabEng/industry/nanotechnology. 

S.S. Musbah, V.J. Radojevi, N.V. Boma, D.B. Stojanovi, M.D. Drami anin, A.D. Marinkovi, R.R. Aleksi, PMMA-Y203 (Eu3-i-) nanocomposites optical and mechanical properties. Journal of the Serbian Chemical Society 76 (2011) 1153—1161. 

In this chapter, we review the characterization of sol-gel films by the more common optical spectroscopy methods, but also some more advanced techniques such as optical propagation loss and Z-scan measurements, for nonlinear optical (NLO) characterization, in connection with publkhed research works on inorganic, hybrid, and nanocomposite optical films and planar waveguides. 

Noble metal nanoparticles dispersed in insulating matrices have attracted the interest of many researchers fromboth applied and theoretical points of view [34]. The incorporation of metallic nanoparticles into easily processable polymer matrices offers a pathway for better exploitation of their characteristic optical, electronic and catalytic properties. On the other hand, the host polymers can influence the growth and spatial arrangement of the nanoparticles during the in situ synthesis, which makes them convenient templates for the preparation of nanoparticles of different morphologies. Furthermore, by selecting the polymer with certain favorable properties such as biocompatibiHty [35], conductivity [36] or photoluminescence [37], it is possible to obtain the nanocomposite materials for various technological purposes. 

Dispersion of nanosilica within the mbber matrices usually generates optically transparent materials. All the ACM-silica and ENR-sihca hybrid composites are completely transparent up to 50 wt% of TEOS concentrations. EoUowing are the figures (Figure 3.9) which show the visual appearance of the representative hybrid nanocomposites. The logos over which the films (average film thickness 0.25 mm) are placed are clearly visible. 

FIGURE 20.14 (a) Height image of a cluster of carbon black (CB) particles. The sample was prepared by pressing the particles into a pellet, (b) Optical micrograph of a cryo-ultramicrotome cut of a mbbery composite loaded with silica, (c, d) Phase images of a nanocomposite of polyurethane (PU) loaded with silica and a mbber blend based on natural mbber (NR) and styrene-butadiene copolymer (SBR) loaded with siUca, respectively. The samples were prepared with a cryo-ultramicrotome. 

The third-order optical Kerr susceptibility of nanocomposites, Xeff. formed by a non-absorbing matrix, with dielectric constant containing metal nanoclusters with low volume fraction p (i.e., filling factor) is given [95] by ... 

The branched polysaccharide dextran is assembled with alkanethiol-modified gold nanoparticles and the resulting nanocomposite is then functionalized to facilitate the specific binding of target biomolecules. This biorecognition process can be easily detected by particle plasmon resonance (PPR), based on the optical properties of gold nanoparticles [163]. 

Fig. 1.12 (A) Increase in surface plasmon ab- and from mixtures with lower chitosan concen-sorptionasAu nanoparticles are produced from a tration (ii) or lower HAuCI4 amount (iii) six reaction mixture containing 1 % chitosan, 1 % different self-sustained nanocomposite films acetic acid and 0.01 % tetrachloroauric (III) acid showing the control over the optical properties. (HAuCU) (B) shiftofsurface plasmon absorption Reprinted with permission from [164], 2004, for films prepared from the previous mixture (i), American Chemical Society.

Significantly, the bio-inorganic and polymer-containing PM nanocomposites showed no significant shift in the protein amide I and II vibration bands, or in the characteristic 567 nm optical absorption band of the retinal chromophore of BR, indicating that the structural and dynamical properties of the membrane-bound... 

Sanchez, C., Lebeau, B., Chaput, F. and Boilot, J.P. (2003) Optical properties of functional hybrid organic-inorganic nanocomposites. Advanced Materials, 15, 1969-1994. 

Lobnik A., Wolfbeis O., Sol-gel based ammonia optical sensor, in proc.of SOL-GEL 97 9th International Workshop on Glasses, Ceramics, Hybrids and Nanocomposites from Gels, Sheffield, UK, 1997. 

Hybrid polymer silica nanocomposites formed from various combinations of silicon alkoxides and polymers to create a nanoscale admixture of silica and organic polymers constitute a class of composite materials with combined properties of polymers and ceramics. They are finding increasing applications in protective coatings (Figure 7.1), optical devices, photonics, sensors and catalysis.1... 

The remaining sections outline recent findings on the optical properties of metal-dendrimer nano-composites. The sections have been organized into areas of interest related to the fabrication as well as photophysical properties of these new and important materials. The first section discusses some of the important issues concerning the fabrication of these novel materials and their chemical characterization. The second section discusses the linear and nonlinear optical properties of these materials. The third section provides details related to the ultrafast emission properties of gold- and silver-dendrimer nanocomposites. 

LINEAR AND NONLINEAR OPTICAL PROPERTIES IN METAL-DENDRIMER NANOCOMPOSITES... 

Understanding the mechanisms of the optical limiting effect in metal dendrimer nanocomposites may also require understanding the timescale of the effect. In general, for optical excitation close to the linear absorption band, such... 

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