SWAXS investigations on diffuse boundary nanostructures of metallic nanoparticles synthesized by electrical discharges

Guo, Xiaoai; Gutsche, Alexander; Nirschl, Hermann

doi:10.1007/s11051-013-2058-7

Cited by 16 publications

(9 citation statements)

References 46 publications

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“…Various measurement techniques have been further developed for product quality control and monitoring. Among them, a modified laboratory SAXS-WAXS measuring system allows very quick or quasi-online study of nanostructured materials synthesized in the gas phase at atmospheric pressure (Guo et al, 2013a(Guo et al, ,b, 2015a. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In this case, the measured parameter P 1 will deviate from Porod's law and have a value greater than four. Based on two electron density profile models, sigmoidal electron-density gradient model (Ruland, 1971) and linear electron-density gradient model (Vonk, 1973), the thickness E of the diffuse boundary nanostructured layer can be determined by processing the scattering data in the plot of ln I (q) • q 4 versus q 2 at large values of scattering vector (Guo et al, 2013a) ln…”

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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“…LaFeSi agglomerates (in the absence of any chemical stabilizer) have a mass fractal dimension ( d m ) of 2.26 and a smooth surface (surface fractal dimension d s = 2.0). The primary particle size ( d p = 6.5 nm) is derived from the particle gyration radius, which is estimated by the red dashed curve shown in Figure 2 a according to Guo et al 25 Figure 2 b compares the X-ray diffraction (XRD) patterns of the bulk (starting material, bottom black curve) with the WAXS results from the NPs (top red curve). The former shows that the NaZn 13 -type structure is the dominating phase.…”

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confidence: 99%

Magnetic Phase Transition in Spark-Produced Ternary LaFeSi Nanoalloys

Feng

Geutjens

Thắng

et al. 2018

ACS Appl. Mater. Interfaces

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Using the magnetocaloric effect in nanoparticles holds great potential for efficient refrigeration and energy conversion. The most promising candidate materials for tailoring the Curie temperature to room temperature are rare-earth-based magnetic nanoalloys. However, only few high-nuclearity lanthanide/transition-metal nanoalloys have been produced so far. Here we report, for the first time, the observation of magnetic response in spark-produced LaFeSi nanoalloys. The results suggest that these nanoalloys can be used to exploit the magnetocaloric effect near room temperature; such a finding can lead to the creation of unique multicomponent materials for energy conversion, thus helping toward the realization of a sustainable energy economy.

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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%

“…where σ is the standard deviation of the Gaussian smoothing function and E is the thickness of the diffuse boundary layer, which can be measured by [38]:…”

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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SWAXS investigations on diffuse boundary nanostructures of metallic nanoparticles synthesized by electrical discharges

Cited by 16 publications

References 46 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)

Magnetic Phase Transition in Spark-Produced Ternary LaFeSi Nanoalloys

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

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