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

Nirschl, Hermann; Guo, Xiaoai

doi:10.1016/j.cherd.2018.06.012

Cited by 21 publications

(5 citation statements)

References 48 publications

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“…In contrast, the larger particles are observed after 24 h aging time in the sol-CPT-1.0, which give an evidence again for the improvement of species particles in the sol-CPT-1.0. 36 This is consistent with the conclusion of fractal dimension described above. It is supposed that Si–OH is formed by hydrolysis of methoxy groups: RSi(OCH 3 ) 3 + 3H 2 O → RSi(OH) 3 + 3CH 3 OH, which is easier to combine with the hydroxyl groups on the surface of inorganic substances and then provides the aluminosilicate entities as the zeolite subunits to grow Y crystals.…”

Section: Resultssupporting

confidence: 91%

Modifying Y zeolite with chloropropyl for improving Cu load on Y zeolite as a super Cu/Y catalyst for toluene oxidation

Meng

Gong

et al. 2021

RSC Adv.

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Section: Resultssupporting

confidence: 91%

Modifying Y zeolite with chloropropyl for improving Cu load on Y zeolite as a super Cu/Y catalyst for toluene oxidation

Meng

Gong

et al. 2021

RSC Adv.

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“…On the other hand, the coating process resulted in the formation of a YAG:Ce shell, growing on the SiO 2 particle surface gradationally by heterogeneous nucleation. Similar side maximum or shoulders have been reported in the literature as particle−particle interactions (structure factor) [40][41][42][43]. In SiO 2 @YAG:Ce with two times coating (coat II), the progressive growth of shell is more visible in the SAXS in which the shoulder or specific side maximum is more clear (Figure 7b), suggesting that the shell grows with time.…”

Section: Saxs Analysessupporting

confidence: 84%

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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“…Several methods have been used to study different thin films in different fields. For example, small-angle X-ray scattering (SAXS) was used as a non-invasive characterization tool for nanostructured and functionalized particles [ 42 ]. Furthermore, several copper oxide films were studied using Kelvin probe force microscopy (KPFM) and conductive AFM (C-AFM) [ 43 ], where different resistivity values were reported for the different oxides studied.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Native Oxide Shell of Copper Metal Powder Spherical Particles

Mahmoud

2022

Materials

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The native oxide layer that forms on copper (Cu) metal spherical particle surfaces under ambient handling conditions has been shown to have a significant effect on sintering behavior during microwave heating in a previous study, where an abnormal expansion was observed and characterized during sintering of Cu compacts using reducing gases. Because microwave (MW) heating is selective and depends greatly on the dielectric properties of the materials, this thin oxide layer will absorb MW energy easily and can consequently be heated drastically starting from room temperature until the reduction process occurs. In the current study, this oxide ceramic layer was qualitatively and quantitatively characterized using the carrier gas hot extraction (CGHE) method, Auger electron spectroscopy (AES), and a dual-beam focused ion beam (FIB)/scanning electron microscope (SEM) system that combines both FIB and SEM in one single instrument. Two different commercial gas-atomized spherical Cu metal powders with different particle sizes were investigated, where the average oxygen content of the powders was found to be around 0.575 wt% using the CGHE technique. Furthermore, AES spectra along with depth profile measurements were used to qualitatively characterize this oxide layer, with only a rough quantitative thickness approximation due to method limitations and the electron beam reduction effect. For the dual-beam FIB-SEM system, a platinum (Pt) coating was first deposited on the Cu particle surfaces prior to any characterization in order to protect and to preserve the oxide layer from any possible beam-induced reduction. Subsequently, the Pt-coated Cu particles were then cross-sectioned in the middle in situ using an FIB beam, where SEM micrographs of the resulted fresh sections were characterized at a 36° angle stage tilt with four different detector modes. Quantitative thickness characterization of this native oxide layer was successfully achieved using the adapted dual-beam FIB-SEM setup with more accuracy. Overall, the native Cu oxide layer was found to be inhomogeneous over the particles, and its thickness was strongly dependent on particle size. The thickness ranged from around 22–67 nm for Cu powder with a 10 µm average particle size (APS) and around 850–1050 nm for one with less than 149 µm.

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

Cited by 21 publications

References 48 publications

Modifying Y zeolite with chloropropyl for improving Cu load on Y zeolite as a super Cu/Y catalyst for toluene oxidation

Modifying Y zeolite with chloropropyl for improving Cu load on Y zeolite as a super Cu/Y catalyst for toluene oxidation

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

Characterization of the Native Oxide Shell of Copper Metal Powder Spherical Particles

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