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Photo-Chemical Synthesis of Iron Oxide Nanowires …

Iron oxide nanowires are formed on the air side of the methane and hydrogen flames.

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Iron oxide nanowires are synthesized ..

Abstract:
Biofilms are three-dimensional structures that contains billions of genetically identical bacteria submerged in a self-produced extracellular matrix, which protect bacteria from antibiotics and the human immunological defenses. More than 85 % of chronic and/or recurrent human infections are linked to bacterial biofilms. In addition, spore-forming pathogenic bacteria represent an additional community threat because of their intrinsic refractory behavior against antibiotics, phagocytes and their easy utilization in bioterrorist attacks. Therefore, every day the available microbicide arsenal against biofilms and spores becomes scarcer. Accordingly, nano-material biotechnology emerges as a promising alternative for reducing the detrimental effects of microbial-related diseases. Here we describe the development of novel nanostructured coating systems with improved photocatalytic and antibacterial activities. These systems comprise, in one case, layers of SiO2 followed by layers of mesoporous or dense TiO2-anatase, and doping with silver nanoparticles (Ag NPs). In the other case, we developed Copper NPs and its oxides by a chemical method based on a bottom up approach and its stabilization using aminosilanes as surface modifiers. The activity of CuNPs and AgNPs (MNPs) was measured against spores and vegetative (planktonic and sessile) forms of the relevant human pathogens Enterohemorrhagic Escherichia coli (etiological agent of Hemolytic Uremic Syndrome), Listeria monocytogenes (etiological agent of septic abortion), Bacillus anthracis (etiological agent of Anthrax), Clostridium perfringens (etiological agent of food-associated diarrhea and Gas Gangrene), cystic-fibrosis related Pseudomona aeruginosa and methicillin-resistant Staphylococcus aureus ( etiological agent of sepsis and myocardiopathies). The planktonic and sessile growth (measured as the final cellular yield at 600 nm and crystal violet staining, respectively) of each pathogen, as well as the sporocide effect on C. perfringens and B. anthracis spores, was very significant at submillimolar concentrations of MNPs (95 % of vegetative growth inhibition and sporocide effect, p

Diffusion limited growth in the template was responsible for zinc oxide nanowires at 70°C.

N2 - Nanotechnologies will not be incorporated into products and devices without the development of scalable, cost-effective manufacturing techniques that retain and preserve the properties of the nanoscalar material in the final product. Because nanowires and nanotubes can be the actual building blocks to construct future nanotechnological products and devices, the properties of the nanoscalar material are retained by default. Here, templated electrodeposition was used as a scalable and cost-effective manufacturing technique for nanowires and nanotubes. As a template, a polycarbonate track-etched (PCTE) membrane was used with different pore sizes: 50 nm and 200 nm. During templated electrodeposition, zinc hydroxide and iron(III) hydroxide formation, decomposition and the following growth processes of zinc oxide nanowires and iron(III) oxide nanotubes were investigated by chronoamperometry. Diffusion limited growth in the template was responsible for zinc oxide nanowires at 70°C. An electrochemically induced sol-gel process in the template and subsequent drying were responsible for iron(III) oxide nanotube formation. Also, steps were taken towards a low-cost and effective incorporation of nanowires and nanotubes on electrodes by dielectrophoresis. The working principle of dielectrophoresis is based on an alternating electric field between (two) electrodes trapping nanowires from a medium in that electric field. To increase reproducibility a set of boundary conditions were used to derive a set of parameters (including frequency, voltage) fit for incorporating nanowires on electrodes regardless of composition. Furthermore, the functionality of nanowires has been engineered to demonstrate hydrogen evolution by photocatalytic nanowires from a methanol/water solution: A segmented nanowire -containing a silver segment and a n-type zinc oxide segment- creates a space charge layer at the silver/zinc oxide interface. The space charge layer creates an electron/hole pair under UV-irradiation. The electron moves towards the silver segment to initiate a reduction reaction. The hole in the zinc oxide is scavenged by the methanol for an oxidative reaction. The overall reaction creates hydrogen and carbon dioxide. Lastly, nanowires were synthesized of the rather unknown silver oxysalt (Ag7NO11). Because of the little attention, no nanowires existed previously of this material.

The Study of Magnetorheology of Iron Oxide Nanowires …

Title of Talk: Environmental Application of Nanosized Zinc Oxide (ZnO) for Water treatments

In this study, magnetic iron nanowires with an iron oxide layer are coated with (3-Aminopropyl)triethoxysilane (APTES), and subsequently labeled with a fluorogenic pH-dependent dye pHrodo™ Red, covalently bound to the aminosilane surface.

TiO2nanowires are coated with metal oxides by a variety of depositionmethods, and then converted to MTiO3 at high temperatures, where M is adivalent transition metal ion such as Mn 2+, CO2+, or Ni2+.

The Study of Magnetorheology of Iron Oxide Nanowires

Title of Talk: Environmental Application of Nanosized Zinc Oxide (ZnO) for Water treatments

The role of iron and chromium in thenanowires will also be investigated, with specific emphasis on how themagnetic, electrical and electrochemical properties are affected bytheir presence.

The as-synthesized nanostructures are characterized by field-emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), and energy dispersive X-ray spectroscopy (EDXS).
Tungsten oxide nanowires are grown with diameters ranging from 50 to 200 nm at 1720K.

(2013) Fabrication and Characterization of Novel Iron Oxide/ Alumina Nanomaterials for Environmental Applications. PhD thesis.
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the charcoal reduced the iron oxide from the ore to ..

Abstract:
Inadequate representation of the human tissue environment during a preclinical screen can result in inaccurate predictions of compound effects. Consequently, pharmaceutical investigators are searching for preclinical models that closely resemble original tissue for predicting clinical outcomes. The current research aims to compare the impact of using serum-free medium instead of complete culture medium during the last step of psoriatic skin substitute reconstruction. Skin substitutes were produced according to the self-assembly approach. Serum-free conditions have no negative impact on the reconstruction of healthy or psoriatic skin substitutes presented in this study regarding their macroscopic or histological appearances. ATR-FTIR results showed no significant differences in the CH2 bands between psoriatic substitutes cultured with or without serum, thus suggesting that serum deprivation did not have a negative impact on the lipid organization of their stratum corneum. Serum deprivation could even lead to a better organization of healthy skin substitute lipids. Percutaneous analyses demonstrated that psoriatic substitutes cultured in serum-free conditions showed a higher permeability to hydrocortisone compared to controls, while no significant differences in benzoic acid and caffeine penetration profiles were observed. Results obtained with this 3D-psoriatic skin substitute demonstrate the potential and versatility of the model. It could offer good prediction of drug related toxicities at preclinical stages performed in order to avoid unexpected and costly findings in the clinic. Together, these findings offer a new approach for one of the most important challenges of the 21st century, namely, prediction of drug toxicity.

Iron oxide nanotubes with a unique inner-surface were also ..

Biography:
O. Guellati, permanent researcher in LEREC laboratory in Algeria, has completed her PhD from Badji-Mokhtar University of Annaba 2013, Algeria on production of Carbon nanotube (CNTs) using CCVD technique and their functionalization and macronisation. She has published 15 papers in reputed journals. She is current reviewer in Nanoscale Research Letters. Actually, she is working on the production of transition metal hydroxides, oxides and their nanocomposites / nanohybrids with CNTs and graphene for energy storage and environment application. She is working in collaboration with ICPEES at ECPM, Strasbourg – France, IMS at University of Valencia – Spain and SARChI Chair in Carbon Technology and Materials at Pretoria University, South Africa.

Iron oxide nanowires are formed on the air …

Biography:
A. Nait-Merzoug, permanent researcher in LEREC laboratory in Algeria, has completed her PhD from Frérés Mentouri University of Constantine 2014, Algeria on production of Carbon nanotube (CNTs) using CCVD technique and their functionalization and macronisation. I have published papers in reputed journals. Actually, I’m working on the production of transition metal hydroxides, oxides and their nanocomposites / nanohybrids with CNTs and graphene for energy storage and environment application. I work in collaboration with Doctor Guellati ounessa.

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