Size stabilization of nanoparticles by polysaccharides: Effectiveness in the wet and curing steps

2007 ◽  
Vol 22 (12) ◽  
pp. 3344-3354 ◽  
Author(s):  
Emanuela Callone ◽  
Giovanni Carturan ◽  
Marco Ischia ◽  
Adriana Sicurelli
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Degree Of Polymerization ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
Organic Part ◽  
Transmission Electron ◽  
Stabilization Effect ◽  
Oxide Particles

Starch suspension proves to be a useful matrix for the hydrolytic route to metal oxide nanoparticles, due to its size-stabilization effect, which works also at high temperatures. To understand the type of interaction between the organic part and the oxide particles, various parameters, such as viscosity, temperature, degree of polymerization, and organic/inorganic kinds of dispersant, are tested through x-ray diffraction (XRD), transmission electron microscopy (TEM), solid-state nuclear magnetic resonance (NMR), and thermogravimetric mass spectra (TG–MS) analyses of the obtained SnO2nanopowders. Results highlight the unique role of starch compared with other hydrophilic dispersants that do not ensure effective size stabilization on curing up to 600 °C. The proof comes from the study of pyrolysis of the residual organic groups surrounding the particles. They are chelating carboxylic species that prevent the coalescence among metal oxide nanoparticles.

scholarly journals Facile meltPEGylation of flame-made luminescent Tb3+-doped yttrium oxide particles: hemocompatibility, cellular uptake and comparison to silica

2018 ◽  
Vol 54 (23) ◽  
pp. 2914-2917 ◽  
Author(s):  
Kerda Keevend ◽  
Guido Panzarasa ◽  
Fabian H. L. Starsich ◽  
Martin Zeltner ◽  
Anastasia Spyrogianni ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Yttrium Oxide ◽  
Cellular Uptake ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
One Pot ◽  
Oxide Particles

MeltPEGylation constitutes an elegant one-pot route for the efficient PEGylation of metal oxide nanoparticles with improved hemo- and cytocompatibility.

scholarly journals Uptake and impacts of polyvinylpyrrolidone (PVP) capped metal oxide nanoparticles on Daphnia magna: role of core composition and acquired corona

2018 ◽  
Vol 5 (7) ◽  
pp. 1745-1756 ◽  
Author(s):  
S. M. Briffa ◽  
F. Nasser ◽  
E. Valsami-Jones ◽  
I. Lynch
Keyword(s):  
Metal Oxide ◽  
Daphnia Magna ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Core Composition

A key hypothesis in nanosafety assessment is that the NP core chemistry and eco-corona are primary factors controlling toxicity.

scholarly journals Mixture Effects of Diesel Exhaust and Metal Oxide Nanoparticles in Human Lung A549 Cells

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1302 ◽  
Author(s):  
Zerboni ◽  
Bengalli ◽  
Baeri ◽  
Fiandra ◽  
Catelani ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Metal Oxide ◽  
Diesel Exhaust ◽  
Human Lung ◽  
Metal Oxide Nanoparticles ◽  
A549 Cells ◽  
Oxide Nanoparticles ◽  
Transmission Electron ◽  
Exhaust Particles

Airborne ultrafine particles (UFP) mainly derive from combustion sources (e.g., diesel exhaust particles—DEP), abrasion sources (non-exhaust particles) or from the unintentional release of engineered nanoparticles (e.g., metal oxide nanoparticles—NPs), determining human exposure to UFP mixtures. The aim of the present study was to analyse the combined in vitro effects of DEP and metal oxide NPs (ZnO, CuO) on human lung A549 cells. The mixtures and the relative single NPs (DEP, ZnO, CuO) were characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS) and inductively coupled plasma-optic emission spectroscopy (ICP-OES). Cells were exposed for different times (3–72 h) to mixtures of standard DEP at a subcytotoxic concentration and ZnO and CuO at increasing concentrations. At the end of the exposure, the cytotoxicity was assessed by 3-(4,5-Dimethylthiazol-2-yl)-2,5-Diphenyltetrazolium Bromide (MTT) and clonogenic tests, the pro-inflammatory potential was evaluated by interleukin-8 (IL-8) release and the cell morphology was investigated by fluorescence and transmission electron microscopy. The obtained results suggest that the presence of DEP may introduce new physico-chemical interactions able to increase the cytotoxicity of ZnO and to reduce that of CuO NPs.

On the Dielectric and Mechanical Behavior of Metal Oxide-Modified PVDF-Based Nanocomposites

2013 ◽  
Author(s):  
Payam Khodaparast ◽  
Zoubeida Ounaies
Keyword(s):  
Mechanical Properties ◽  
Metal Oxide ◽  
Polyvinylidene Fluoride ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Modified Polymers ◽  
Different Types ◽  
Dielectric And Mechanical Properties ◽  
Multifunctional Properties

Nanoparticle modified polymers have promise as hybrid materials that exhibit properties beyond those predicted by mixing law theories. In the case of metal-oxide nanoparticles in a polymer, it is expected that multifunctional properties of the obtained nanocomposite, including dielectric and mechanical, will be dominated by presence of interface rather than predicted by the inherent properties of individual components. This paper will focus on understanding the role of different types of nanoparticles, namely, titania, silica and alumina and a polymer matrix, Polyvinylidene fluoride (PVDF) in affecting the final dielectric and mechanical properties.

The Role of Microbiota and Metal Oxide Nanoparticles on Small Intestinal Enzyme Activity

2020 ◽  
Author(s):  
Alba García-Rodríguez ◽  
Fabiola Moreno-Olivas ◽  
Ricard Marcos ◽  
Elad Tako ◽  
Cláudia N. H. Marques ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Small Intestinal ◽  
Intestinal Enzyme

Abstract The authors have removed this preprint from Research Square

scholarly journals Role of metal oxide nanoparticles in histopathological changes observed in the lung of welders

2014 ◽  
Vol 11 (1) ◽  
pp. 23 ◽  
Author(s):  
Pascal Andujar ◽  
Angélique Simon-Deckers ◽  
Françoise Galateau-Sallé ◽  
Barbara Fayard ◽  
Gregory Beaune ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Histopathological Changes

scholarly journals Structural and morphological tuning of Cu-based metal oxide nanoparticles by a facile chemical method and highly electrochemical sensing of sulphite

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Velayutham Sudha ◽  
Govindhasamy Murugadoss ◽  
Rangasamy Thangamuthu
Keyword(s):  
Crystal Structures ◽  
Chemical Method ◽  
Metal Oxide Nanoparticles ◽  
Modified Electrodes ◽  
Electrochemical Sensing ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
One Step

AbstractA facile one-step chemical method is introduced for the successful synthesis of Cu2O, CuO and CuNa2(OH)4 crystal structures and their electrochemical properties were also investigated. X-ray diffraction studies revealed that these copper-based oxide nanoparticles display different crystal structures such as cubic (Cu2O), monoclinic (CuO) and orthorhombic [CuNa2(OH)4]. The microstructural information of nanoparticles was investigated by transmission electron microscopy. It shows attractive morphologies of different orientation such as rod like structure, nanobeads and well-aligned uniform nanorod for Cu2O, CuO and CuNa2(OH)4, respectively. Electrochemical sensing of sulphite (SO32−) on these three copper-based oxide modified electrodes was investigated. Among the three different crystal structures, CuO shows promising electrocatalytic activity towards oxidation of sulphite. A linear variation in peak current was obtained for SO32− oxidation from 0.2 to 15 mM under the optimum experimental condition. The sensitivity and detection limit were in the order of 48.5 µA cm−2 mM−1 and 1.8 µM, respectively. Finally, practical utility of CuO modified electrode was demonstrated for the estimation of sulphite in commercial wine samples.

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