Rods, nano-sized

The physical and chemical properties of MgO films prepared by the sol-gel technique were the area interest of the examinations presented by Shukla75. The aim of mentioned work was to produce films with nano size particles so as to employ them for the sensor applications, as adsorption in such films increases many folds due to the increase of surface area. Infra-red spectroscopic studies indicated the presence of solvent in the precursor, which helped in decomposition to nano-particles during nucleation of the film. The MgO sol-gel films were deposited on the glass rod bend in U-shape for humidity sensor. 

An effect similar or lower than with larger particles this indicates that other factors, besides exposed surface play a role, which might be more effective in larger particles than for nano-sized particles. For example the effects of nanoscale TiC>2 rods, as well as nano TiC>2 dots (20 nm), were not significantly different from larger TiC>2 particles (300 nm) at equivalent doses.17... 

The homopolymerization of reactive surfactants in the form of assemblies, such as micelles or liquid crystals, have been attempted as a way to freeze the structure and prepare various types of nano-sized materials. Polymerization of micelles has not been entirely successful, however. With both spherical and rod-like micelles, the polymerized aggregates were of much larger size than the original structures. With liquid crystals and, in particular, with vesicles, the result is more promising. Stable vesicles, of interest for drug administration, have been prepared by free-radical polymerization of preformed vesicles. Such vesicles need not be based entirely on polymerizable surfactants. Incorporation of... 

Rod-shaped M13 viruses electrospun with polymer to fabricate one-dimensional micro- and nano-sized fibers. 

Nanomaterials, as described here, are defined as materials with at least one of three dimensions <100 nm. Spherical nanoparticles, such as alumoxanes or silica nanoparticles, are nano-sized in aU three dimensions. Nanotubes (carbon nanotubes), rods, or needles (HA) have two nanometer-sized dimensions. Nanosheets, such as layered sihcates, have only one dimension in the nanoscale. Each of these nanomaterials offers mechanical reinforcement or osteoconductivity by dispersing into a matrix and chemically interacting with the macroscopic material. However, these particles are typically hydrophilic while the macroscopic material into which they are dispersed is usually hydrophobic. Thus, nanomaterial dispersion and promotion of interactions between the nanofiUers and the macroscopic material are the two primary challenges for nanocomposite development. 

Chemists have synthesized a spectacular array of submicron- and nano-particles with well-defined size and atomic structure and very special properties. Examples include CdSe quantum dots and novel spheres and rods. Transport enters the picture via fundamental studies of the physical processes that affect the synthesis, which must be understood for even modest scale-up from the milligram level. Likewise, processes for assembling fascinating face-centered-cubic crystals or ordered multilayers must concentrate on organizing the particles via flow, diffusion, or action of external fields. Near-perfection is possible but requires careful understanding and control of the forces and the rates. 

We chose to use a sacrificial template method to make our nanorods. This method uses a membrane with nano/microscopic sized channels as a mold for the design of a nanowire, fiber, or rod, depending upon the intended use for the object and the materials comprising it. ... 

The electronic absorption spectra of metal nanocrystals in the visible region are dominated by the plasmon bands. This absorption is due to the collective excitation of the itinerant electron gas on the particle surface and is characteristic of a nanocrystal of a given size. In metal colloids, surface plasmon excitations impart characteristic colors to the metal sols, with the beautiful wine-red color of gold sols being well known [53-56]. The dependence of the plasmon peak on the dielectric constant of the surrounding medium and the diameter of the nanocrystal was predicted theoretically by Mie and others at the turn of the last century [57-60]. The dependence of the absorption band of thiol-capped Au nanocrystals on solvent refractive index was recently verified by Templeton et al. [61]. Link and El-Sayed [53, 54] found that the absorption band splits into longitudinal and transverse bands in Au nano-rods. 

Like the liquid crystalline ordering of collection of rod-shaped particles in concentrated dispersions, collections of disc-shaped particles should also exhibit orientational order with sufficient concentration and narrow size and shape distributions [113, 114]. Moreover, disc-like objects are experimentally observed to exhibit nematic, smectic and columnar type mesophases in consistent with theoretical predictions. Since graphene can be considered as disc-like nano-object with very high aspect ratio, it has been shown that upon dispersion in sufficiently high concentrations it exhibits liquid crystalline phase behavior. The following are the different methods to fabricate and stabilize graphene based liquid crystalline phases. 

In addition, controlled aggregation gives anisotropic-shaped particles similar to those reported for ZnO nano-rods. The confined space growth process has a rather long history. This process makes particles in a confined space such as a microemulsion. In this case, the collision frequency, stabiUty, and shape of the emulsions affect the particle-size distribution and shapes. 

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