Current Trends in Carbon Nanotubes and Their Applications
Suresh Sagadevan,
R. Varatharajan
Issue:
Volume 1, Issue 4, November 2013
Pages:
79-82
Received:
17 September 2013
Published:
10 November 2013
Abstract: Carbon based nanostructure materials exhibit unique mechanical, electrical, and optical characteristics, which may result in many unique device designs. These materials are biocompatible, chemically inert but capable of altering their electronic properties in the presence of some chemical species, and dimensionally compatible with biomolecules. They have interesting electronic characteristics, thus rendering them as potential chemical and biosensors. The recent progress in nanostructured materials and their possible applications in chemical and biological sensors could have a significant impact on data collection, processing, and recognition. This investigation is aimed towards evaluating the applications of nano-structures of carbon and giving a consolidated view of the structure, properties and applications of carbon nanotubes, with the aim of drawing attention to useful available information and to enhancing the interest in this new highly advanced technological field for the researcher and the manufacturing engineer.
Abstract: Carbon based nanostructure materials exhibit unique mechanical, electrical, and optical characteristics, which may result in many unique device designs. These materials are biocompatible, chemically inert but capable of altering their electronic properties in the presence of some chemical species, and dimensionally compatible with biomolecules. The...
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Determination of Pb and Ni in Natural Water Samples after Solid Phase Extraction with Layered Double Hydroxide (LDH) Nano-Particles
Saeedeh sepehrikiya,
Donya arefi
Issue:
Volume 1, Issue 4, November 2013
Pages:
83-86
Received:
21 October 2013
Published:
20 November 2013
Abstract: Due to the industrialization, especially in the developing countries, the emission of the heavy metals as lead, cadmium, chromium, nickel, arsenic, and mercury are highly concerned to public and aquatic health. Lead is released with the effluent from the paint, batteries, and automobiles manufacturing units. Lead is one of the toxic metals and largely affects the central, peripheral nervous system. In this study, a suitable and reliable method for the direct determination of Pb and Ni ions in environmental water is proposed. Pb and Ni ions were extracted and precocentrated with layered double hydroxides (LDHs) nano-particles. LDHs, relatively inexpensive and simply prepared material, was synthesized and used as a solid phase extraction (SPE) adsorbent to quantitatively determine the concentration of Pb and Ni ions in natural water samples. Several factors affecting the extraction efficiency, such as, eluent type, eluent volume, flow rate of sample, sample volume, and amount of adsorbent, were investigated and optimized in detail. Pb and Ni ions can be quantitatively retained by LDH nano-particles, then eluted completely by 1 mL of CO32- (1.5 mol L‒1) and1mL EtOH (65% v/v), respectively. The detection limit of this method for Pb and Ni ions was 17 ng mL−1with an enrichment factor of 100, and the relative standard deviation (RSD) was 1.4%.
Abstract: Due to the industrialization, especially in the developing countries, the emission of the heavy metals as lead, cadmium, chromium, nickel, arsenic, and mercury are highly concerned to public and aquatic health. Lead is released with the effluent from the paint, batteries, and automobiles manufacturing units. Lead is one of the toxic metals and larg...
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Monmorillonite Modified with Oligourethane Ammonium Chloride and Based Nanostructured Polymers
Savelyev Yuri,
Gonchar Аlexey,
Travinskaya Тamara
Issue:
Volume 1, Issue 4, November 2013
Pages:
87-93
Received:
16 December 2013
Published:
10 January 2014
Abstract: For the purpose of developing of polymer nanocomposites based on polar polymers - polyurethane and related polymers, a method of modifying the montmorillonite (MMT) with a new modifier containing urethane groups in it structure has been first elaborated. Exchange capacity of the MMT surface was determined by adsorption of methylene blue; the structure of the modifier was confirmed by X-ray analysis, the content of the organic component in the modified MMT was measured by thermogravimetric analysis. The molecular weight and molecular weight distribution of the modifier was determined by size exclusion chromatography. The resulting modified MMT has been designed to form nanostructured composites on the basis of polymers having polar groups in their composition, including polyurethanes, with the aim to increase the physical and mechanical properties of based film materials. The new modifier – oligourethane ammonium chloride provides high affinity of MMT with the polymer matrix due to the possibility of hydrogen bonds formation. The intercalation of modifier into MMT interlayer space (increasing the distance between the layers after modification by 0.68 nm), as well as the total exfoliation of MMT in polyurethane urea matrix, characterized by the disappearance of the absorption peak which is responsible for layered structure has been proved by the WAXS method. Physic-mechanical tests demonstrated an increase in film strength of the polymer nanocomposite compared to the polyurethane matrix by 40% at a sufficiently low MMT (0.5%) content.
Abstract: For the purpose of developing of polymer nanocomposites based on polar polymers - polyurethane and related polymers, a method of modifying the montmorillonite (MMT) with a new modifier containing urethane groups in it structure has been first elaborated. Exchange capacity of the MMT surface was determined by adsorption of methylene blue; the struct...
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