Nanocomposite Materials for Optical Applications

Department of Materials Science and Engineering, Cornell University, Итак, New York, United States
Chemistry of Materials (Impact Factor: 8.35). 06/1997; 9(6). DOI: 10.1021/cm960441a


A substantial amount of work has been carried out in the area of nanocomposite materials for optical applications. Composites are typically constructed by embedding an optically functional phase into a processable, transparent matrix material. By doing so, the optical properties can be utilized in more technologically important forms such as films and fibers. This review covers many areas of optical composite research to date. Composites with second- and third-order nonlinearities and laser amplification properties are discussed with examples from the recent literature. Other composites, including transparent magnets, may be made using similar structures. The principles used to construct these composites may have important technological applications soon and are therefore summarized in this review.

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Available from: Christopher K Ober, Oct 10, 2015
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    • "During the last few decades, the elaboration and characterization of nanocomposite materials have been intensively studied. To date, the incorporation of a small amount of nanofiller (mostly 3– 5 wt%) into a polymer matrix significantly improves the resulting material properties like thermo-mechanical, semi-conduction, optical properties barrier performances [1] [2] [3]. Therefore, these hybrid materials are widely involved in many industrial applications like automotive, aerospace components, construction, packaging or medical materials [4] [5]. "
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    ABSTRACT: Hybrid membranes made of a biopolymer matrix poly(butylene succinate) (PBS) or poly(butylene suc-cinate-co-butylene adipate) (PBSA) loaded with 5 wt% of native (CNa) or organo-modified (C30B) mon-tmorillonites were successfully extruded using new extrusion conditions where liquid water was introduced into the extruder barrel to improve the nanofiller dispersion and exfoliation levels. The C30B incorporation in both matrices leads to the degradation of polymer chains and the reduction of the thermal stability while the CNa introduction combined with the water injection presents no effect on the polymer molecular weight and the thermal stability. The water-assisted extrusion process enables the increase in CNa dispersion and exfoliation levels in both matrices, which improves barrier properties to gases and water by tortuosity effects. In the case of C30B, the positive effect of dispersion induced by water injection was much less pronounced since C30B particles were already well dispersed and ex-foliated in both matrices. The use of the water injection at high pressure during the extrusion process was found really efficient for native montmorillonite and so appears as a promising process for dispersing hydrophilic particles in polymers having a low hydrophilic character, without preliminary chemical modification of the fillers.
    Journal of Membrane Science 09/2015; 496:185-198. DOI:10.1016/j.memsci.2015.08.043 · 5.06 Impact Factor
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    • "Due to the different characteristics of metals at the nanometric scale, it is important to study the influence of size and shape on physical, chemical and biological properties [1] [2] [3] [4] [5]. "
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    ABSTRACT: In recent years, nickel nanoparticles (NPs) have increased scientific interest because of their extensive prospects in catalysts, information storage, large-scale batteries and biomedicine. Several works on Ni NPs generation by laser ablation have appeared in the literature in the last years, using different pulsed laser regimes and different media have been published recently. In this work we analyze the characteristics of species, structure (bare core or core-shell), configuration and size distribution of NPs generated by fs pulse laser ablation over a Ni solid target in n-heptane and water. We explore the presence of NiO-Ni core-shell and hollow Ni (or air-Ni) NPs in the colloids obtained. These were experimentally characterized using AFM and TEM microscopy, as well as Optical Extinction Spectroscopy (OES). Extinction spectra were modeled using Mie theory through an appropriate modification of the complex experimental dielectric function, taking into account a size-dependent corrective term for each free and bound electron contribution. Experimental UV-visible-NIR spectra were reproduced considering a size distribution of bare core, hollow and core-shell structures NPs. In both media, Ni NPs shape and size distribution agrees with that derived from TEM and AFM analysis.
    Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, San Diego, California, USA; 08/2015
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    • "The nanocomposites exhibit the nonlinear characteristics much enhanced as against the homogeneous bulk material. Typically, these nanocomposites comprise metallic or semiconductor nanoparticles embedded in a dielectric matrix [1] [2]. Up to now, the studies of the optical nonlinearity of the dielectric nanoparticles are quite rare [3] [4] [5] [6]. "
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    ABSTRACT: In this paper, effect of dipole-dipole interactions on nonlinear optical properties of the system of randomly located semiconductor nanoparticles embedded in bulk dielectric matrix is investigated. This effect results from the nonzero variance of the net dipole field in an ensemble. The analytical expressions describing the contribution of the dipole-dipole coupling to nonlinear dielectric susceptibility are obtained. The derived relationships are applicable over the full range of nanoparticle volume fractions. The factors entering into the contribution and depending on configuration of the dipoles are calculated for several cases. It is shown that for the different arrangements of dipole alignments the relative change of this contribution does not exceed 1/3.
    Journal of Modern Optics 09/2013; 60(11). DOI:10.1080/09500340.2013.822590 · 1.01 Impact Factor
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