Preparation and Surface Layer Modification of Silicon Nanoparticles Dispersed in 2-Propanol

Zhu, Yan; Iwasaki, Shingo; Kimura, Kazuhiro; Zhang, Lide

doi:10.1088/0256-307x/15/12/024

Cited by 20 publications

(5 citation statements)

References 9 publications

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“…Samples were prepared in Ar or Ar+H 2 atmospheres by using an arc plasma with the gas flow method appropriate for colloid preparation, and characterized by transmission electron microscopy (TEM) and energy dispersed x-ray analysis (EDX) (the details have been reported elsewhere [11]). Briefly, the results are nearly the same as for samples prepared by a dc sputtering method except the particle size distributions [12].…”

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confidence: 99%

Oscillations in the derivatives of broad structureless absorption spectra of silicon nanocolloids

Zhu

Zhang

1999

J. Phys.: Condens. Matter

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Two set of fine structure were found in the derivatives of broad structureless ultraviolet and visible absorption spectra of silicon nanocolloids prepared by using an arc plasma with the gas flow method in Ar and Ar+H 2 atmospheres, separately. Calculation shows that these two sets of fine structure arise from oscillation-electron coupling of silicon electron transitions. The oscillations strongly depend on how many oxygen and/or hydrogen atoms are bonded to each silicon atom. This weak effect is an indication that the silicon nanoparticle surface and interface layer structure and chemical composition have a measurable effect on the electronic properties.

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confidence: 99%

Oscillations in the derivatives of broad structureless absorption spectra of silicon nanocolloids

Zhu

Zhang

1999

J. Phys.: Condens. Matter

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“…Finally, wood sheets were inserted into the bottom side and the sample was extracted from the mine. Several samples were collected with the same method and transported to the laboratory with careful protection [31]. The ore grade, density, moisture content and specific density were all measured from raw samples and are listed in table 1.…”

Section: Sample Preparationmentioning

confidence: 99%

Dynamic pore structure evolution of the ion adsorbed rare earth ore during the ion exchange process

et al. 2019

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During the leaching process of the ion-adsorbed rare earth (RE) ore, the pore structure evolution of the ore body plays a vital role in the seepage of the leaching solution. To investigate the evolution of the pore structure during the leaching process, experiments have been carried out with remodelled RE ore samples based on the physical characteristics of in situ ores. The seepage rate difference between deionized water leaching solution and 2% NH4Cl leaching solution during the active leaching period was analysed. The porosity and the dynamic pore size evolution of pore structures in the ore body are discussed. Results indicate that along with ion exchange between the RE ore and the leaching solution, the porosity of the sample remains constant and the pore structure shows a decreasing trend in the first part and an increasing trend in the second part. Specifically, during the ion exchange process, the number of minimal pores (0–5 µm), small pores (5–10 µm) and medium pores (10–25 µm) increases significantly and the number of medium–large pores (25–60 µm), large pores (60–120 µm) and mega pores (greater than 120 µm) decreases dramatically. Along with the completion of the ion exchange process, the evolution of porous structure shows an opposite trend. The mechanism study reveals that the evolution of pore structure is induced by the difference of ionic strength in the leaching solution during the ion exchange process, where the RE ore microparticles will be absorbed or desorbed on to the solid phase.

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“…Beibuwan Gulf (BBG) is a typical continental shelf sea. It is located in the northwestern region (17)(18)(19)(20)(21)(22) • N, 105-110 • E) of the South China Sea (SCS) and is the fourth largest fishing ground in China [17]. The BBG is a semi-enclosed gulf with complex ocean dynamics and a water depth generally <100 m. It is connected to the main SCS through the Qiongzhou Strait and an opening in the south.…”

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confidence: 99%

Potential Associations between Low-Level Jets and Intraseasonal and Semi-Diurnal Variations in Coastal Chlorophyll—A over the Beibuwan Gulf, South China Sea

et al. 2021

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Low-level jet (LLJ) significantly affects the synoptic-scale hydrometeorological conditions in the South China Sea, although the impact of LLJs on the marine ecological environment is still unclear. We used multi-satellite observation data and meteorological reanalysis datasets to study the potential impact of LLJs on the marine biophysical environment over the Beibuwan Gulf (BBG) in summer during 2015–2019. In terms of the summer average, the sea surface wind vectors on LLJ days became stronger in the southwesterly direction relative to those on non-LLJ days, resulting in enhanced Ekman pumping (the maximum upwelling exceeds 10 × 10−6 m s−1) in most areas of the BBG, accompanied by stronger photosynthetically active radiation (increased by about 20 μmol m−2 s−1) and less precipitation (decreased by about 3 mm day−1). These LLJ-induced hydrometeorological changes led to an increase of about 0.3 °C in the nearshore sea surface temperature and an increase of 0.1–0.5 mg m−3 (decrease of 0.1–0.3 mg m−3) in the chlorophyll-a (chl-a) concentrations in nearshore (offshore) regions. Intraseasonal and diurnal changes in the incidence and intensity of LLJs potentially resulted in changes in the biophysical ocean environment in nearshore regions on intraseasonal and semi-diurnal timescales. The semi-diurnal peak and amplitude of chl-a concentrations on LLJ days increased with respect to those on non-LLJ days. Relative to the southern BBG, LLJ events exhibit greater impacts on the northern BBG, causing increases of the semi-diurnal peak and amplitude with 1.5 mg m−3 and 0.7 mg m−3, respectively. This work provides scientific evidence for understanding the potential mechanism of synoptic-scale changes in the marine ecological environment in marginal seas with frequent LLJ days.

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Preparation and Surface Layer Modification of Silicon Nanoparticles Dispersed in 2-Propanol

Cited by 20 publications

References 9 publications

Oscillations in the derivatives of broad structureless absorption spectra of silicon nanocolloids

Oscillations in the derivatives of broad structureless absorption spectra of silicon nanocolloids

Dynamic pore structure evolution of the ion adsorbed rare earth ore during the ion exchange process

Potential Associations between Low-Level Jets and Intraseasonal and Semi-Diurnal Variations in Coastal Chlorophyll—A over the Beibuwan Gulf, South China Sea

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