Light scattering behavior of oxide nanoparticles

2013 ◽  
Author(s):  
Rakesh Kumar Gupta ◽  
Braden Bills ◽  
Mukul Dubey ◽  
David Galipeau ◽  
Qi Hua Fan
Keyword(s):  
Light Scattering ◽  
Oxide Nanoparticles

scholarly journals Reversible magnetism switching of iron oxide nanoparticle dispersions by controlled agglomeration

2021 ◽  
Author(s):  
Stephan Müssig ◽  
Björn Kuttich ◽  
Florian Fidler ◽  
Daniel Haddad ◽  
Susanne Wintzheimer ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Light Scattering ◽  
Superparamagnetic Iron Oxide ◽  
Iron Oxide Nanoparticle ◽  
Oxide Nanoparticles ◽  
X Ray ◽  
X Ray Scattering ◽  
Nanoparticle Dispersions ◽  
Oxide Nanoparticle

The controlled agglomeration of superparamagnetic iron oxide nanoparticles (SPIONs) was used to rapidly switch their magnetic properties. Small-angle X-ray scattering (SAXS) and dynamic light scattering showed that tailored iron oxide...

H3PO4 / oxide nanoparticles / polymer composites as proton conducting membranes

2001 ◽  
Vol 703 ◽  
Author(s):  
D. Carrière ◽  
P. Barboux ◽  
M. Moreau ◽  
J.-P. Boilot
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Infrared Spectroscopy ◽  
Light Scattering ◽  
Magnetic Resonance ◽  
Impedance Spectroscopy ◽  
Composite Membranes ◽  
Oxide Nanoparticles ◽  
Zirconium Acetate ◽  
Conductive Particles ◽  
Conducting Membranes

ABSTRACTStable sols of 60 nm colloidal zirconia have been prepared by thermolysis of zirconium acetate. The surface complexing acetate groups have been replaced by phosphoric acid groups. Phosphate grafting has been characterized by dynamic light scattering, infrared spectroscopy, 31P nuclear magnetic resonance and impedance spectroscopy measurements. These systems give acid and proton conductive particles (4.10-5 S.cm-1 at 70 % relative humidity).H3PO4/ZrO2/PVDF-co-HFP composite membranes have been synthesized. Impedance spectroscopy measurements allow discrimination between proton conduction at the surface of the phosphated particles and within free H3PO4 in the polymer. For the highest H3PO4/ZrO2 ratios, the latter phenomenon prevails, giving a proton conductivity of 6.10-4 S.cm-1 at 70 % R.H.

scholarly journals Temperature-dependent breakdown of hydrogen peroxide-treated ZnO and TiO2 nanoparticle agglomerates

2015 ◽  
Vol 6 ◽  
pp. 1897-1903 ◽  
Author(s):  
Sinan Sabuncu ◽  
Mustafa Çulha
Keyword(s):  
Hydrogen Peroxide ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Temperature Dependent ◽  
Oh Groups ◽  
Widespread Implementation ◽  
Nanoparticle Agglomerates ◽  
Individual Nanoparticles

Metal oxide nanoparticles (MONPs) are used in a variety of applications including drug formulations, paint, sensors and biomedical devices due to their unique physicochemical properties. One of the major problems with their widespread implementation is their uncontrolled agglomeration. One approach to reduce agglomeration is to alter their surface chemistry with a proper functionality in an environmentally friendly way. In this study, the influence of hydrogen peroxide (H2O2) treatment on the dispersion of ZnO and TiO2 nanoparticle (NP) agglomerates as a function of temperature is studied. The H2O2 treatment of the MONPs increases the density of hydroxyl (–OH) groups on the NP surface, as verified with FTIR spectroscopy. The influence of heating on the dispersion of H2O2-treated ZnO and TiO2 NPs is investigated using dynamic light scattering. The untreated and H2O2-treated ZnO and TiO2 NP suspensions were heated from 30 °C to 90 °C at 5 °C intervals to monitor the breakdown of large aggregates into smaller aggregates and individual nanoparticles. It was shown that the combined effect of hydroxylation and heating enhances the dispersion of ZnO and TiO2 NPs in water.

Refractive Index Engineering of Nano-Polymer Composites

2001 ◽  
Vol 676 ◽  
Author(s):  
Nobuyuki Kambe ◽  
Sujeet Kumar ◽  
Shiv Chiruvolu ◽  
Benjamin Chaloner-Gill ◽  
Yigal D. Blum ◽  
...  
Keyword(s):  
Refractive Index ◽  
Composite Materials ◽  
Light Scattering ◽  
Metal Oxide ◽  
Polymer Composites ◽  
Polymer Composite ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Photonic Materials ◽  
Index Variation

ABSTRACTHighly homogeneous nanoparticles-polymer composite materials are being developed to meet high demands of photonic materials covering a broad range of the refractive index. Refractive index engineering can be achieved by controlling loading level of metal-oxide nanoparticles within an organic host material. The uniformity and small size of nanoparticles are critical to maintain a low level of light scattering, particularly in the visible to infrared regions. First observations of index variation for these nanoparticle-polymer composites to our knowledge are presented.

Stable aqueous dispersions of bare and double layer functionalized superparamagnetic iron oxide nanoparticles for biomedical applications

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jano Markhulia ◽  
Shalva Kekutia ◽  
Vladimer Mikelashvili ◽  
László Almásy ◽  
Liana Saneblidze ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Light Scattering ◽  
Iron Oxide Nanoparticles ◽  
Superparamagnetic Iron Oxide ◽  
Point Of View ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Colloidal System ◽  
Colloidal Systems ◽  
X Ray

Abstract Superparamagnetic iron oxide nanoparticles (SPIONs) have attracted the particular interest of scientists from various disciplines since their obtaining to the present day. The physicochemical and pharmacokinetic properties of SPIONs-containing magnetic nanofluids, and their applicability in biomedicine, largely depend on the stability of the colloidal system, particle size, size distribution, net magnetic moment, phase composition, and type and properties of stabilizers. Also, in some cases, when using magnetic nanoparticles for biomedical purposes, it is necessary that the stabilizing ligands of nanoparticles should not significantly change the magnetic properties. From this point of view, the preparation of stable colloidal systems containing bare iron oxide nanoparticles (BIONs) in water at physiological pH attracts particular attention and becomes increasingly popular in scientific circles. This study is focused on the development of the synthesis of aqueous suspensions of SPIONs stabilized with various organic molecules (oleic acid [OA] and poly(ethylene glycol) monooleate - with molecular weights 460 and 860) using a modified controlled chemical coprecipitation reaction, as well as stable nanofluids containing BIONs in an aqueous medium at neutral pH (near-physiological). The obtained samples were characterized using X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy, small-angle x-ray scattering (SAXS), dynamic light scattering (DLS), electrophoretic light scattering (ELS), and Vibrating Sample Magnetometry.

Synthesis and Characterisation of Pure Zirconium Oxide (ZrO2) Nanoparticle by Conventional Precipitation Method

2021 ◽  
Vol 10 (4) ◽  
pp. 19-21
Author(s):  
V. Gayathri ◽  
R. Balan
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Zirconium Oxide ◽  
Precipitation Method ◽  
Zro2 Nanoparticles ◽  
Oxide Nanoparticles ◽  
Visible Spectroscopy ◽  
Pure Zirconium ◽  
Ft Ir ◽  
Zirconium Oxide Nanoparticles

In this paper, the synthesis of Zirconium oxide (ZrO2) nanoparticles was carried out by the Conventional precipitation method. Ultraviolet, visible spectroscopy (UV-Vis), and dynamic light scattering analysis (DLS) were performed to find the particles' bandgap and size. Fourier transform infrared spectroscopy (FT-IR) observed the characteristic bands of Zirconium oxide nanoparticles. Dynamic light scattering analysis showed that the size of the particle was found to be 119 nm.

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