Journal of Nanoparticle Research

article

Migration-coalescence of Nanoparticles During Deposition of Au, Ag, Cu, and GaAs on Amorphous SiO2

Hiroaki Shirakawa, Hiroshi Komiyama

Journal of Nanoparticle Research > 1999 > 1 > 1 > 17-30

Nanoparticles formed during the initial period of film growth can migrate, coalesce, and may also melt. Nanoparticles of Au, Ag, Cu, and GaAs ranging from 1 to 15 nm in diameter were sputter-deposited on amorphous SiO₂ (a-SiO₂). Transmission electron microscopy was used to analyze the time-dependent change of the dispersion of particles on a thin film. The number density of nanoparticles was nearly...

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First Joint ESF-NSF Symposium on Aerosols for Nanostructured Materials and Devices, Edinburgh, Scotland, September 12, 1998

David Y.H. Pui, Heinz Fissan

Journal of Nanoparticle Research > 1999 > 1 > 1 > 145-145

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Nanoscience and Engineering: The Next Five Years

Calvin F. Quate

Journal of Nanoparticle Research > 1999 > 1 > 1 > 131-136

The current and planned research in nanoscience and engineering will make possible a paradigm shift in nanoscale devices and structures.

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The Effect of Nanoscale Roughness on Long Range Interaction Forces

John Y. Walz, Lakkapragada Suresh, Martin Piech

Journal of Nanoparticle Research > 1999 > 1 > 1 > 99-113

A model was developed to calculate the long range van der Waals and electrostatic energies between a rough colloidal particle and a smooth solid plate in aqueous solutions. The particle roughness was modeled as hemispherical asperities distributed uniformly over the surface. Because of the assumption of additive potentials used in calculating the electrostatic force, the model is most accurate when...

article

Electronic Applications of Carbon Nanotubes Become Closer to Reality

V. Zhirnov, D. Herr, M. Meyyappan

Journal of Nanoparticle Research > 1999 > 1 > 1 > 151-152

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Instructions for Authors

Journal of Nanoparticle Research > 1999 > 1 > 1 > 153-157

article

Supramolecular Architectures through Self-organization

Jean-Marie Lehn, Nobel Laureate

Journal of Nanoparticle Research > 1999 > 1 > 1 > 7-7

article

Computational Materials Chemistry at the Nanoscale

Tahir Çağın, Jianwei Che, Yue Qi, Yanhua Zhou, more

Journal of Nanoparticle Research > 1999 > 1 > 1 > 51-69

In order to illustrate how atomistic modeling is being used to determine the structure, physical, and chemical properties of materials at the nanoscale, we present here the results of molecular dynamics (MD) simulations on nanoscale assemblies of such materials as carbon nanotubes, diamond surfaces, metal alloy nanowires, and ceramics. We also include here the results of nonequilibrium MD simulations...

article

Nanocomposite Mullite/Mullite Powders by Spray Pyrolysis

Daniel M. Dabbs, Nan Yao, Ilhan A. Aksay

Journal of Nanoparticle Research > 1999 > 1 > 1 > 127-130

A mullite/mullite nanocomposite powder has been synthesized, composed of nanometer-size 3Al₂O₃·2SiO₂ (‘3/2’) mullite precipitates within a matrix of the high alumina 2Al₂O₃·SiO₂ (‘2:1’) mullite. Historically, the transition from the metastable high-alumina phase to the thermodynamically stable ‘3:2’ phase of mullite has been thought to be a continuous process, involving a continuous solid solution...

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Nanoparticles and Nanotechnology Research

M.C. Roco

Journal of Nanoparticle Research > 1999 > 1 > 1 > 1-6

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A High Efficiency, High Throughput Unipolar Aerosol Charger for Nanoparticles

Da-Ren Chen, David Y.H. Pui

Journal of Nanoparticle Research > 1999 > 1 > 1 > 115-126

A novel aerosol charger has been developed, which has high efficiency and high throughput especially for nanometer particles in the size range of 3–50 nm. Unipolar charging with high ion concentration and long charging time is used to obtain the high charging efficiency. High throughput is achieved by reducing particle loss within the charger. This is accomplished by directing ion flow and aerosol...

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Nanotechnology at NASA

Meyya Meyyappan, Carl A. Kukkonen

Journal of Nanoparticle Research > 1999 > 1 > 1 > 141-143

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Macrophage Activation by a Lipophilic Derivative of Muramyldipeptide within Nanocapsules: Investigation of the Mechanism of Drug Delivery

Isabelle Seyler, Martine Appel, Jean-Philippe Devissaguet, Philippe Legrand, more

Journal of Nanoparticle Research > 1999 > 1 > 1 > 91-97

Different colloidal formulations: nanocapsules (NC), emulsion and micelles, containing the lipophilic immunomodulator muramyltripeptide cholesterol (MTP-Chol) induce nitric oxide synthase activity in the RAW 264.7 cell line. The use of cytochalasin B, an inhibitor of cell movements, showed that phagocytosis was an important mechanism as far as NC and the emulsion were concerned. However, when the...

article

Excitation of Intra-4f Shell Luminescence of Rare Earth Ions (Er3+ and Yb3+) by the Energy Transfer from Si Nanocrystals

M. Fujii, S. Hayashi, K. Yamamoto

Journal of Nanoparticle Research > 1999 > 1 > 1 > 83-90

Photoluminescence (PL) properties of SiO₂ films containing Si nanocrystals (nc-Si) and Er³⁺ (Yb³⁺) were studied. PL peaks attributable to the recombination of electron–hole pairs in nc-Si (∼1.5 eV) and the intra-4f shell transition of Er³⁺ (∼0.81 eV) (Yb³⁺ (∼1.26 eV)) were observed simultaneously at room temperature. Correlation of the two peaks was studied as a function of nanocrystalline size. It...

article

From Discoveries to Novel Nanodevices

Herb Goronkin, Raymond K. Tsui

Journal of Nanoparticle Research > 1999 > 1 > 1 > 137-139

article

Making the Nanoworld Comprehensible: Instructional Materials for Schools and Outreach

Arthur B. Ellis, Thomas F. Kuech, George C. Lisensky, Dean J. Campbell, more

Journal of Nanoparticle Research > 1999 > 1 > 1 > 147-150

article

From Molecules to Particles: Quantum-chemical View Applied to Fumed Silica

E. Sheka, V. Khavryutchenko, E. Nikitina

Journal of Nanoparticle Research > 1999 > 1 > 1 > 71-81

An extended quantum-chemical study has been performed to examine the flame-generated silica formation at the atomic level. Starting from a set of free molecules, condensation was shown to be a non-barrier and energetically favorable. The coalescence of the formed bare-surface protoparticles can be prevented by particle surface passivation in the course of the hydroxylation reaction. The protoparticle...

article

The Effect of Substrate Temperature on the Properties of Nanostructured Silicon Carbide Films Deposited by Hypersonic Plasma Particle Deposition

J. Blum, N. Tymiak, A. Neuman, Z. Wong, more

Journal of Nanoparticle Research > 1999 > 1 > 1 > 31-42

Nanostructured silicon carbide films have been deposited on molybdenum substrates by hypersonic plasma particle deposition. In this process a thermal plasma with injected reactants (SiCl₄ and CH₄) is expanded through a nozzle leading to the nucleation of ultrafine particles. Particles entrained in the supersonic flow are then inertially deposited in vacuum onto a temperature-controlled substrate,...

article

Polymer-like Behavior of Inorganic Nanoparticle Chain Aggregates

S.K. Friedlander

Journal of Nanoparticle Research > 1999 > 1 > 1 > 9-15

Studies of the behavior of nanoparticle chain aggregates (NCA) have shown properties similar to those of molecular polymers. Like polymer chains, NCA tend to gather up and become more compact when heated. Under tensile stress, folded chain segments pull out and the NCA elongates. When the tension is relaxed, the chains contract. The stretching of NCA may contribute to the ductility of compacts made...

article

Surface Sol–gel Synthesis of Ultrathin Titanium and Tantalum Oxide Films

Mingming Fang, Chy Hyung Kim, Benjamin R. Martin, Thomas E. Mallouk

Journal of Nanoparticle Research > 1999 > 1 > 1 > 43-49

TiO₂, Ta₂O₅, and mixed TiO₂/Ta₂O₅ ultrathin films were grown layer-by-layer using a surface sol–gel deposition technique. The technique allows one to prepare smooth films of mixed composition with ångstrom-level control of thickness. The thickness increases per adsorption/hydrolysis cycle were 4.5, 2.1, and 2.5 Å, respectively, for TiO₂, Ta₂O₅, and mixed TiO₂/Ta₂O₅ (1.6sol;1) films. By combining X-ray...

INFONA - science communication portal

Journal of Nanoparticle Research

Migration-coalescence of Nanoparticles During Deposition of Au, Ag, Cu, and GaAs on Amorphous SiO2

First Joint ESF-NSF Symposium on Aerosols for Nanostructured Materials and Devices, Edinburgh, Scotland, September 12, 1998

Nanoscience and Engineering: The Next Five Years

The Effect of Nanoscale Roughness on Long Range Interaction Forces

Electronic Applications of Carbon Nanotubes Become Closer to Reality

Instructions for Authors

Supramolecular Architectures through Self-organization

Computational Materials Chemistry at the Nanoscale

Nanocomposite Mullite/Mullite Powders by Spray Pyrolysis

Nanoparticles and Nanotechnology Research

A High Efficiency, High Throughput Unipolar Aerosol Charger for Nanoparticles

Nanotechnology at NASA

Macrophage Activation by a Lipophilic Derivative of Muramyldipeptide within Nanocapsules: Investigation of the Mechanism of Drug Delivery

Excitation of Intra-4f Shell Luminescence of Rare Earth Ions (Er3+ and Yb3+) by the Energy Transfer from Si Nanocrystals

From Discoveries to Novel Nanodevices

Making the Nanoworld Comprehensible: Instructional Materials for Schools and Outreach

From Molecules to Particles: Quantum-chemical View Applied to Fumed Silica

The Effect of Substrate Temperature on the Properties of Nanostructured Silicon Carbide Films Deposited by Hypersonic Plasma Particle Deposition

Polymer-like Behavior of Inorganic Nanoparticle Chain Aggregates

Surface Sol–gel Synthesis of Ultrathin Titanium and Tantalum Oxide Films

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