The interest in nanoscale materials stems from the fact that new properties are acquired at this length scale and, equally important, that these properties * To whom correspondence should be addressed. Phone, 404-8940292; fax, 404-894-0294; e-mail, mostafa.el-sayed@ chemistry.gatech.edu. † Case Western Reserve UniversitysMillis 2258. ‡ Phone, 216-368-5918; fax, 216-368-3006; e-mail, burda@case.edu. § Georgia Institute of Technology. 1025 Chem. Rev. 2005, 105, 1025−1102

Chemistry and properties of nanocrystals of different shapes.

1: Magnetic Particles: Preparation, Properties and Applications: M. Ozaki. 2: Maghemite (gamma-Fe2O3): A Versatile Magnetic Colloidal Material C.J. Serna, M.P. Morales. 3: Dynamics of Adsorption and Oxidation of Organic Molecules on Illuminated Titanium Dioxide Particles Immersed in Water M.A. Blesa, R.J. Candal, S.A. Bilmes. 4: Colloidal Aggregation in Two-Dimensions A. Moncho-Jorda, F. Martinez-Lopez, M.A. Cabrerizo-Vilchez, R. Hidalgo Alvarez, M. Quesada-PMerez. 5: Kinetics of Particle and Protein Adsorption Z. Adamczyk.

Surface and Colloid Science

Materials research plays a vital role in transforming breakthrough scientific ideas into next-generation technology. Similar to the way silicon revolutionized the microelectronics industry, the proper materials can greatly impact the field of plasmonics and metamaterials. Currently, research in plasmonics and metamaterials lacks good material building blocks in order to realize useful devices. Such devices suffer from many drawbacks arising from the undesirable properties of their material building blocks, especially metals. There are many materials, other than conventional metallic components such as gold and silver, that exhibit metallic properties and provide advantages in device performance, design flexibility, fabrication, integration, and tunability. This review explores different material classes for plasmonic and metamaterial applications, such as conventional semiconductors, transparent conducting oxides, perovskite oxides, metal nitrides, silicides, germanides, and 2D materials such as graphene. This review provides a summary of the recent developments in the search for better plasmonic materials and an outlook of further research directions.

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Alternative Plasmonic Materials: Beyond Gold and Silver

A surface science perspective on TiO2 photocatalysis

New generation adsorbents for water treatment.

Low temperature synthesis of ultrafine α-Al2O3 powder by a simple aqueous sol–gel process

Single-phase nanocrystalline CoAl 2 O 4 spinel powder with a high surface area has been directly prepared by an auto-ignited gel combustion process using citric acid as a reductant/fuel and metal nitrates as oxidants. The molar ratio of fuel to nitrates in the redox mixture and the subsequent calcination upon the burnt powder were found to have a significant influence on the characteristics of the as-synthesized CoAl 2 O 4 crystallites. By controlling the CA/NO 3 − ratio and calcination temperature, homogeneous crystalline CoAl 2 O 4 powders with different particle sizes from 9 to 110 nm have been obtained. Gel formation, combustion behavior, microstructures and properties of the powders were characterized using DTA/TGA, FT-IR, XRD, FESEM, TEM, BET and UV/vis/IR.

Synthesis and characterization of nanocrystalline CoAl2O4 spinel powder by low temperature combustion

Carbon nanotubes (CNTs) and SiO 2 glass powder were mixed by ultrasonication in ethanol solution. CNT–SiO 2 composites with improved mechanical properties were fabricated by hot pressure sintering in 1300 °C 25 MPa, N 2 atmosphere). Effects of CNTs content on the relative density and mechanical properties were investigated. The bending strength and fracture toughness of the 5vol.%CNT–SiO 2 composite, compared with the monolithic SiO 2 , were enhanced 65 and 100%, respectively. The main reinforcing mechanisms include CNTs pulling-out, crack deflxion, bridging and CNTs rupture. The defects and aligning direction of CNTs in the matrix are also the affecting factors on the mechanical properties of composites as prepared.

Jingkun Guo

Papers

Low temperature synthesis of ultrafine α-Al2O3 powder by a simple aqueous sol–gel process

Synthesis and characterization of nanocrystalline CoAl2O4 spinel powder by low temperature combustion

Fabrication and mechanical properties of SiO2 matrix composites reinforced by carbon nanotube

Gradient multilayer structural design of CNTs/SiO2 composites for improving microwave absorbing properties

Fabrication, microstructure and properties of highly transparent Nd:YAG laser ceramics