Recent Patents on Nanotechnology

ISSN: 1872-2105

Recent Patents on Nanotechnology
Volume 3, Number 2, June 2009

Contents


State of the Art of the Bi- and Trimetallic Nanoparticles on the Basis of Gold and Iron Pp. 81-98
Boris I. Kharisov, Oxana V. Kharissova, Miguel J. Yacamán and Ubaldo Ortiz M.
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Recent Advances in Nanoparticle Preparation by Spray and Microemulsion Methods Pp. 99-115
Morteza Eslamian and Marzieh Shekarriz
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Catalyzed Light Hydride Nanomaterials Embedded in a Micro Channels Hydrogen Storage Container Pp. 116-134
Zahir Dehouche, Hernán A. Peretti, Yeong Yoo, Khaled Belkacemi and Jacques Goyette
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DNA in the Material World: Electrical Properties and Nano Applications Pp. 135-153
Georgios P. Triberis and Margarita Dimakogianni
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Functionalization of Carbon Nanotubes: Manufacturing Techniques and Properties of Customized Nanocomponents for Molecular-level Technology Pp. 154-161
Sohaib Akbar and Aqeel A. Taimoor
[Abstract] [Purchase Issue/Articles]


Patent Selections Pp. 162-163




Abstracts


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State of the Art of the Bi- and Trimetallic Nanoparticles on the Basis of Gold and Iron
Boris I. Kharisov, Oxana V. Kharissova, Miguel J. Yacamán and Ubaldo Ortiz M.

Recently reported patents and experimental articles on the synthesis, properties, and main applications of coreshell nanoparticles, containing iron or its oxides and gold, as well as trimetallic systems on their basis, are reviewed. These nanostructures were obtained by a series of methods, including reduction in reverse micelles, decomposition of organometallic compounds, electron-beam, laser and γ-irradiation, sonolysis and electrochemical methods. (Fe or Fe_xO_y)/Au nanoparticles are subject to be functionalized with organic moieties, may expand their main applications, which consist of catalysis, biological and biomedical uses.


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Recent Advances in Nanoparticle Preparation by Spray and Microemulsion Methods
Morteza Eslamian and Marzieh Shekarriz

Micro- and nano sized metal, semiconductor, pharmaceutical, and simple or complex ceramic particles have numerous applications in the development of sensors, thermal barrier coatings, catalysts, pigments, drugs, etc. The challenges include controlling the particle size, size distribution, particle crystallinity, morphology and shape, being able to use the nanoparticles for a given purpose, and to produce them from a variety of precursors. There are several methods to produce nanoparticles, each suitable for a range of applications. In this article, two methods that are receiving increasing attention are considered: Spray and microemulsion methods. Spray techniques are single-step methods of producing a broad spectrum of simple to multicomponent functional micro and nanoparticles and quantum dots. Microemulsion is a wet chemistry method. A micro-emulsion system consists of aqueous domains, called reverse micelles, dispersed in a continuous oil phase. In this article, the above mentioned methods of nanoparticle production are introduced and recent advances, research directions and challenges, and the pertinent patents are reviewed and discussed.


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Catalyzed Light Hydride Nanomaterials Embedded in a Micro Channels Hydrogen Storage Container
Zahir Dehouche, Hernán A. Peretti, Yeong Yoo, Khaled Belkacemi and Jacques Goyette

Activated alloys synthesized by arc-melting were examined as catalysts for improving the hydrogen sorption characteristics of nanostructured magnesium hydride, proposed as a reversible hydrogen storage material. The MgH₂-catalyst absorbing materials were prepared by ball milling of pure MgH₂ with hydrided Zr₄₇Ni₅₃, Zr₉Ni₁₁, and other alloys investigated. The nanostructured MgH₂-intermetallic systems were tested at 250°C and catalyst addition of eutectoid Zr₄₇Ni₅₃ resulted in the fastest desorption time and highest initial desorption rate. The catalyzed Mg-hydride with activated Zr₉Ni₁₁ and Zr₇Ni₁₀ phases showed fast desorption kinetics. Moreover, the results demonstrated that the composition of dispersed Zr_xNi_y catalysts has a strong influence on the amount of accumulated hydrogen and desorption rate of Mg-nanocomposite.

Part two covers advanced micro-channels hydrogen storage module design based on the results of semi-empirical computer simulations of heat and mass transfers in the container. The micro-channels reservoir concept offers many advantages over the conventional metal hydride hydrogen storage system. It is a micro-structured system that can pack a lot of power into a small space and dissipate effectively the heat of the sorption reactions. This review summarize recent patents related to CNTS.


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DNA in the Material World: Electrical Properties and Nano Applications
Georgios P. Triberis and Margarita Dimakogianni

Contradictory experimental findings and theoretical interpretations have spurred intense debate over the electrical properties of the DNA double helix. In the present review article the various factors responsible for these divergences are discussed. The enlightenment of this issue could improve long range chemistry of oxidative DNA damage and repair processes, monitoring protein-DNA interactions and possible applications in nano-electronic circuit technology. The update experimental situation concerning measurements of the electrical conductivity is given. The character of the carriers responsible for the electrical conductivity measured in DNA is investigated. A theoretical model for the temperature dependence of the electrical conductivity of DNA is presented, based on microscopic models and percolation theoretical arguments. The theoretical results, excluding or including correlation effects, are applied to recent experimental findings for DNA, considering it as a one dimensional molecular wire. The results indicate that correlation effects are probably responsible for large hopping distances in DNA samples. Other theoretical conductivity models proposed for the interpretation of the responsible transport mechanism are also reviewed. Some of the most known and pioneering works on DNA’s nano-applications, future developments and perspectives along with current technological limitations and patents are presented and discussed.


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Functionalization of Carbon Nanotubes: Manufacturing Techniques and Properties of Customized Nanocomponents for Molecular-level Technology
Sohaib Akbar and Aqeel A. Taimoor

Carbon nanotubes (CNTs) since their discovery have been the focus of research on account of exceptional chemical, mechanical and electrical properties. However, manipulation and processing of CNTs have been limited by their compatibility with other materials. Considerable efforts have therefore been devoted to the surface modification of CNTs to pave the way to many useful applications and to realize the potential applications in successful products, especially composite manufacturing. The chemical modification, dispersion and solubilization of CNTs represent an emerging area in the research on nanotubes-based materials. Several research groups have reported successful and doable functionalization techniques for single-walled (SWCNT) and multi-wall (MWCNT) carbon nanotubes. This paper presents an overview of the functionalization of the carbon nanotubes covering both covalent and non-covalent techniques at tips and walls of SWCNTs and MWCNTs, and summarizes recent patents possessing significant commercial value and large-scale practicality. The principle aim is to review main approaches to chemical functionalization of CNTs and to account for the advances that have been made so far.