Xem 1-20 trên 67 kết quả Nanoparticle research
  • In May 2006, the nanotechnology consultancy firm Lux Research published a report entitled ‘‘Taking action on nanotech environmental, safety and health risks’’ (Lux Research, 2006). The report addressed the potential impact of real and perceived risks on nano-businesses from a commercial perspective, and concluded that ‘‘One of the biggest challenges facing firms commercializing nanotechnology innovations today is managing environmental, health and safety (EHS) risks)’’.

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  • Groundwater remediation by nanoparticles has become a major interest in recent years. This report presents the ability of hexavalent chromium removal in aqueous using iron (Fe0) nanoparticles. Cr(VI) is a major pollution of groundwater and more toxic than Cr(III). Fe0 reduces Cr(VI), transforming Cr(VI) to nontoxic Cr(III). At a dose of 0.2g/l iron (Feo) nanoparticles, 100% of Cr(VI) 5mg/l was removed after only 20 minutes. The Cr(VI) removal efficiency increased with decreasing initial pH.

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  • Fe3O4 nanoparticles have been prepared by the microemulsion technique with water as the aqueous phase, n-hexane as the oil phase and Span 80 as the surfactant. The reaction occurred under air, N2 or high temperature and high pressure atmosphere. Particle size can be controlled by the concentration of the reactants dissolved in water, the ratio of water/surfactant and the atmospheric conditions.

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  • Products of nanotechnology are expected to revolutionize modern medicine, as evidenced by recent scientific advances and global initiatives to support nanotechnology and nanomedicine research. The field of drug delivery is a direct beneficiary of these advancements. Due to their versatility in targeting tissues, accessing deep molecular targets, and controlling drug release, nanoparticles are helping address challenges to face the delivery of modern, as well as conventional drugs.

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  • Proteins adsorbed on nanoparticles (NPs) are being used as biosensors and in drug delivery. However, our understanding of the effect of NPs on the structure of proteins is still in a nascent state. In this work we report the unfolding behavior of the periplasmic domain of the ToxR protein (ToxRp) of Vibrio choleraeon zinc oxide (ZnO) nanoparticles with a diam-eter of 2.5 nm.

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  • In a biological environment, nanoparticles immediately become covered by an evolving corona of biomolecules, which gives a biological identity to the nanoparticle and determines its biological impact and fate. Previous efforts at describing the corona have concerned only its protein content. Here, for the first time, we show, using size exclusion chromatography, NMR, and pull-down experiments, that copolymer nanoparticles bind cholesterol, tri-glycerides and phospholipids from human plasma, and that the binding reaches saturation. ...

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  • Nanotechnology and the Environment: Applications and Implications will showcase the latest research in nanotechnology that has both environmental applications and implications. This book will serve as a complete reference framework on how nanotechnology relates to the environment. Book sections cover important research topics relating to how nanotechnology can be used to protect the environment and how nanotechnology might affect the environment or human health.

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  • The generation of wastes as a result of human activities has been continuously speeding up since the beginning of the industrial revolution. Hence, both optimized waste water treatment technologies and modern tools to assess the effects of pollution sources are necessary to prevent the contamination of aquatic ecosystems The book offers an interdisciplinary collection of topics concerning waste water treatment technologies, water quality monitoring and evaluation of waste water impact on natural environments.

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  • Thermodynamics is one of the most exciting branches of physical chemistry which has greatly contributed to the modern science. Being concentrated on a wide range of applications of thermodynamics, this book gathers a series of contributions by the finest scientists in the world, gathered in an orderly manner. It can be used in post-graduate courses for students and as a reference book, as it is written in a language pleasing to the reader. It can also serve as a reference material for researchers to whom the thermodynamics is one of the area of interest....

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  • This book is a result of contributions of experts from international scientific community working in different aspects of nanocomposite science and applications and reports on the state of the art research and development findings on nanocomposites through original and innovative research studies.

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  • Zhao and Nan Nanoscale Research Letters 2011, 6:230 http://www.nanoscalereslett.com/content/6/1/230 NANO EXPRESS Open Access Preparation of stable magnetic nanofluids containing Fe3O4@PPy nanoparticles by a novel one-pot route Baobao Zhao and Zhaodong Nan* Abstract Stable magnetic nanofluids containing Fe3O4@Polypyrrole (PPy) nanoparticles (NPs) were prepared by using a facile and novel method, in which one-pot route was used. FeCl3·6H2O was applied as the iron source, and the oxidizing agent to produce PPy. Trisodium citrate (Na3cit) was used as the reducing reagent to form Fe3O4 NPs.

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  • Characterization and elucidation of the size-dependent evolution of the physical and chemical properties of finite materials aggregates, having discrete quantized energy level spectra, specific structural and morphological motifs and exhibiting unique dynamical characteristics, are among the outstanding challenges of modern materials science.

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  • Research on nanoparticles, including synthesis, characterization of the structural, chemical and physical properties, assembly into 1-, 2- and 3-dimensional architectures extending over several lengths scales and with hierarchical construction principles, and application in various fields of technology, represents a fundamental cornerstone of nanoscience and nanotechnology.

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  • White et al. Nanoscale Research Letters 2011, 6:346 http://www.nanoscalereslett.com/content/6/1/346 NANO REVIEW Open Access Investigation of the electrical conductivity of propylene glycol-based ZnO nanofluids Steven Bryan White*, Albert Jau-Min Shih and Kevin Patrick Pipe Abstract Electrical conductivity is an important property for technological applications of nanofluids that has not been widely studied.

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  • Ju Park et al. Nanoscale Research Letters 2011, 6:223 http://www.nanoscalereslett.com/content/6/1/223 NANO EXPRESS Open Access Optimal synthesis and characterization of Ag nanofluids by electrical explosion of wires in liquids Eun Ju Park1, Seung Won Lee2, In Cheol Bang2, Hyung Wook Park1* Abstract Silver nanoparticles were produced by electrical explosion of wires in liquids with no additive. In this study, we optimized the fabrication method and examined the effects of manufacturing process parameters.

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  • Fang et al. Nanoscale Research Letters 2011, 6:237 http://www.nanoscalereslett.com/content/6/1/237 NANO REVIEW Open Access Measurement of the extinction coefficients of magnetic fluids Xiaopeng Fang, Yimin Xuan*, Qiang Li Abstract A novel spectral transmittance approach for measuring the extinction coefficient of magnetic fluids is proposed. The measuring principle and accuracy of the approach are analysed. Experiments are conducted to measure the extinction coefficient of magnetic fluids with different particle volume fractions.

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  • Cieslinski and Kaczmarczyk Nanoscale Research Letters 2011, 6:220 http://www.nanoscalereslett.com/content/6/1/220 NANO EXPRESS Open Access Pool boiling of water-Al2O3 and water-Cu nanofluids on horizontal smooth tubes Janusz T Cieslinski*, Tomasz Z Kaczmarczyk Abstract Experimental investigation of heat transfer during pool boiling of two nanofluids, i.e., water-Al2O3 and water-Cu has been carried out. Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight. The horizontal smooth copper and stainless steel tubes having 10 mm OD and 0.

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  • Wang et al. Nanoscale Research Letters 2011, 6:241 http://www.nanoscalereslett.com/content/6/1/241 NANO EXPRESS Open Access High-quality reduced graphene oxidenanocrystalline platinum hybrid materials prepared by simultaneous co-reduction of graphene oxide and chloroplatinic acid Yinjie Wang, Jincheng Liu*, Lei Liu, Darren Delai Sun* Abstract Reduced graphene oxide-nanocrystalline platinum (RGO-Pt) hybrid materials were synthesized by simultaneous coreduction of graphene oxide (GO) and chloroplatinic acid with sodium citrate in water at 80°C, of pH 7 and 10.

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  • Duan et al. Nanoscale Research Letters 2011, 6:248 http://www.nanoscalereslett.com/content/6/1/248 NANO EXPRESS Open Access Viscosity affected by nanoparticle aggregation in Al2O3-water nanofluids Fei Duan*, Dingtian Kwek, Alexandru Crivoi Abstract An investigation on viscosity was conducted 2 weeks after the Al2O3-water nanofluids having dispersants were prepared at the volume concentration of 1-5%. The shear stress was observed with a non-Newtonian behavior. On further ultrasonic agitation treatment, the nanofluids resumed as a Newtonian fluids.

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  • n this book some recent advances in development of photodetectors and photodetection systems for specific applications are included. In the first section of the book nine different types of photodetectors and their characteristics are presented. Next, some theoretical aspects and simulations are discussed. The last eight chapters are devoted to the development of photodetection systems for imaging, particle size analysis, transfers of time, measurement of vibrations, magnetic field, polarization of light, and particle energy.

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