Time-resolved SAXS characterization of the shell growth of silica-coated magnetite nanocomposites

Gutsche, Alexander; Daikeler, Alexander; Guo, Xiaoai; Dingenouts, N.; Nirschl, Hermann

doi:10.1007/s11051-014-2475-2

Cited by 17 publications

(22 citation statements)

References 28 publications

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“…As a restriction Fig. 7 -Time-resolved SAXS characterisation of the shell growth of silica-coated magnetite nanocomposites which were synthesized with co-precipitation followed by modified Stöber-process (Stöber et al, 1968;Gutsche et al, 2014) it should be mentioned that primary particles are frequently polydisperse. This results in a smearing of the scattering data.…”

Section: Resultsmentioning

confidence: 99%

“…The structure in the scattering pattern becomes less pronounced with increasing polydispersity, while the mean particle size determined from the scattering curve does not change. In practice, different particle size distribution functions are used to fit the experimental SAXS curves of nanostructured and functionalised particle systems such polydisperse spheres and core-shell nanocomposites (Dingenouts et al, 1994;Goertz et al, 2009b;Gutsche et al, 2014).…”

Section: Data Processingmentioning

confidence: 99%

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Characterisation of structured and functionalised particles by small-angle X-ray scattering (SAXS)

Nirschl

Guo

2018

Chemical Engineering Research and Design

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In this work we provided an overview about the use of small-angle X-ray scattering (SAXS) technology for non-invasive characterisation of nanostructured and functionalised particles. Firstly, we demonstrated our modular-designed laboratory SAXS camera with different options and possibilities for quick in-situ measuring various disperse particulate systems including powders and suspensions as well as aerosol nanoparticles which can be deposited on a certain substrate. The detection angle reaches 90 • , allowing simultaneous wide-angle X-ray scattering (WAXS) measurement on the crystalline structures. Further extension of the sample-to-detector distance enables multi-level structural characterisation of particle systems ranging from about one nanometer to several hundred nanometers. The use of an on-line X-ray detector makes on-line in-situ analysis possible. Secondly, different data processing methods and models have been introduced for analyzing the acquired scattering data and retrieving the structural parameters of the investigated particle systems. Finally, we presented some selected experimental results obtained by SAXS-WAXS, including commercial nanoparticles, and laboratory-synthesized nanostructured and functionalised particles such as silica multiplets, silica-magnetite core-shell nanocomposites, metallic nanoparticles and catalyst nanodots on oxide support particles in different liquid-and gas-phase synthesis processes as well as nanostructured particles in particle handling processes like high pressure dispersion and high temperature calcination.

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Section: Resultsmentioning

confidence: 99%

Section: Data Processingmentioning

confidence: 99%

Characterisation of structured and functionalised particles by small-angle X-ray scattering (SAXS)

Nirschl

Guo

2018

Chemical Engineering Research and Design

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“…This is in particular useful for ideal two-phase structure with smooth surfaces and sharp boundaries. In order to determine the effective thickness of boundary layer along the radial direction of the sphere, the following formula is suggested [38,39]:…”

Section: Saxs Analysesmentioning

confidence: 99%

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

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This paper aims to investigate the synthesis, structure, and optical properties of SiO2@YAG:Ce core–shell optical nanoparticles for solid state lighting applications. YAG:Ce phosphor is a key part in white light emitting diodes (LEDs), with its main functionality being the generation of yellow light. Generated yellow light from phosphor will be combined with blue light, emitted from chip, resulting in the generation of white light. Generated light in LEDs will often be scattered by SiO2 nanoparticles. SiO2 nanoparticles are often distributed within the optical window, aiming for a more homogeneous light output. The main idea in this research is to combine these functionalities in one core–shell particle, with its core being SiO2 and its shell being phosphor. In this study core–shell nanoparticles with different Ce3+ concentrations were synthesized by a sol–gel method. Synthesized nanoparticles were characterized by X-ray diffraction (XRD), small angle X-ray scattering (SAXS) analysis, high resolution transmission electron macroscopy (HRTEM), Fourier transform infrared (FTIR), and photoluminescence spectroscopy. Luminescence characteristics of SiO2@YAG:Ce core–shell particles were compared with that of SiO2/YAG:Ce mixture composite, which is now used in commercial LEDs. Obtained results showed that core–shell nanoparticles have comparatively much better optical properties, compared to SiO2/YAG:Ce mixture composite and can therefore be potentially used in LEDs.

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“…The same limitations apply to light-scattering techniques as to microcapsule size analysis in that the data are related to the average properties rather than individual measurements (Lifshin, 1999). The size restrictions of SAXS mean that analysis has largely focused on nanocapsules (Gutsche, Daikeler, Guo, Dingenouts, & Nirsche, 2014;Utama, Dulle, Forster, Stenzel, & Zetterlund, 2015). However, ultra-small-angle X-ray scattering can spatially resolve structures up to 10 m, making it of interest in microcapsule analysis, although no results have yet been published.…”

Section: Structural Properties Of Microcapsulesmentioning

confidence: 99%

Determination of microcapsule physicochemical, structural, and mechanical properties

et al. 2016

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a b s t r a c tResearch into the fundamental properties of microcapsules and use of the results to develop a wide variety of products in industries such as printing, fast-moving consumer goods, construction, pharmaceuticals, and agrochemicals is a dynamic and ever-progressing field of study. For microcapsules to be effective in providing protection from harsh environments or delivering large payloads, it is essential to have a good understanding of their properties to enable quality control during formulation, storage, and applications. This review aims to outline the commonly used techniques for determining the physicochemical, structural, and mechanical properties of microcapsules, and highlights the interlinked nature of these three areas with respect to the end-use industrial application. This review provides information on techniques that are well supported in the literature, and also examines microcapsule analytical techniques that will become more prevalent as a result of new technological developments or extensions from other areas of study.

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Time-resolved SAXS characterization of the shell growth of silica-coated magnetite nanocomposites

Cited by 17 publications

References 28 publications

Characterisation of structured and functionalised particles by small-angle X-ray scattering (SAXS)

Characterisation of structured and functionalised particles by small-angle X-ray scattering (SAXS)

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Determination of microcapsule physicochemical, structural, and mechanical properties

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