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Full-Text Articles in Nanoscience and Nanotechnology

Nucleation And Growth Of Metals On Carbon Surfaces, David Victor Appy Jan 2014

Nucleation And Growth Of Metals On Carbon Surfaces, David Victor Appy

Graduate Theses and Dissertations

This thesis work presents an investigation of the basic interaction between metals and the carbon surfaces HOPG and amorphous carbon. This work was motivated by the discovery of a family of metal nanowires which grow as single crystals protruding substantially perpendicular to a substrate, where the substrate is held at elevated temperature (800-1100 K). The most prolific growth is seen for Cu on amorphous carbon substrates. The fabrication and properties of these wires have been pioneered by our collaborator, Dr. Gunther Richter, at the Max Planck Institute for Intelligent Systems in Stuttgart, Germany. They have potential uses in nanoscale mechanical ...


Phase Field Approach For Melting Of Aluminum Nanoparticles, Kamran Samani Jan 2013

Phase Field Approach For Melting Of Aluminum Nanoparticles, Kamran Samani

Graduate Theses and Dissertations

Aluminum nanoparticles are of interest due to the variety of their applications, including additives for plastics and powder metallurgy. They can also enhance the burning rate of propellants. Metallic particles in traditional thermites are in the micron size range. When the particle diameter reduces to the nanometer range, their reactivity increases by several orders of magnitude. Thus flame rates of 0.9-1 km/s can be reached, while for micron size thermites they are on the order of centimeters or meters per second. Ignition delay time also decreases by up to three orders of magnitude.

The two main continuum methods ...


Rod-Like Plasmonic Nanoparticles As Optical Building Blocks: How Differences In Particle Shape And Structural Geometry Influence Optical Signal, Anthony Shawn Stender Jan 2013

Rod-Like Plasmonic Nanoparticles As Optical Building Blocks: How Differences In Particle Shape And Structural Geometry Influence Optical Signal, Anthony Shawn Stender

Graduate Theses and Dissertations

Gold nanoparticles, particularly those with an anisotropic shape, have become a popular optical probe for experiments involving work on the nanoscale. However, to carry out such delicate and intricate experiments, it is first necessary to understand the detailed behavior of individual nanoparticles. In this series of experiments, optical and electron microscopy were utilized for the characterization of individual nanoparticles and small assemblies of nanoparticles.

In the first experiment, gold nanorods were investigated. Single, isolated nanorods exhibit two maxima of localized surface plasmon resonance (LSPR), which are associated with the two nanorod axes. Upon the physical rotation of a nanorod at ...


Growth And Characterization Of Functional Nanoparticulate Films By A Microwave Plasma-Assisted Spray Deposition Process, Ted Wangensteen Jan 2012

Growth And Characterization Of Functional Nanoparticulate Films By A Microwave Plasma-Assisted Spray Deposition Process, Ted Wangensteen

Graduate Theses and Dissertations

Nanoparticle and nanoparticulate films have been grown by a unique approach combining a microwave and nebulized droplets where the concentration and thus the resulting particle size can be controlled. The goal of such a scalable approach was to achieve it with the least number of steps, and without using expensive high purity chemicals or the precautions necessary to work with such chemicals. This approach was developed as a result of first using a laser unsuccessfully to achieve the desired films and particles. Some problems with the laser approach for growing desired films were solved by substituting the higher energy microwave ...