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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    • "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 search for flexible and highly transparent materials with good mechanical properties has interested various industries for many years because of the rapid expansion of optoelectronic devices such as displays, solar cells, and organic light-emitting diodes [1e3]. Nanofibre materials serve as optical components for a variety of optical applications due to their small size preventing scattering [4]. There are two main types of transparent nanofibres. "
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    ABSTRACT: Optically transparent and cable-like Polyacrylonitrile/polyacrylic acid (PAN/PAA) nanofibres filled with ultrafine fibrils were obtained via eletrospinning at a high relative humidity. PAN fibrils 20.8 nm in diameter were dispersed in the nanofibre core. The optical property of composite NFs membrane can be tailored by atmosphere humidity during electrospinning and the bicomponent proportion. The transmittance and the tensile strength of these composites increased with the content of PAA increasing, their transmittances were from 74.8 to 88.8% and tensile strengths were from 12.0 to 15.6 MPa, much higher than pristine PAN NFs of 46.0% and 5.7 MPa. Optically transparent PAN/PAA composites have potential to be a promising alternative as components of optoelectronic devices.
    Composites Science and Technology 08/2015; 117. DOI:10.1016/j.compscitech.2015.07.017 · 3.57 Impact Factor
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