Tunable photoluminescence in monodisperse silica spheres

Kong, Deyan; Zhang, Cuimiao; Xu, Zhenhe; Hou, Zhiyao; Lin, Jun

doi:10.1016/j.jcis.2010.08.054

Cited by 33 publications

(22 citation statements)

References 35 publications

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“…In agreement with a recently published study by Kong et al [52], dynamic light scattering measurements confirmed (Fig. 4) the increase of the apparent hydrodynamic diameter with increasing APTES concentration in the silane precursor mixture.…”

Section: Influence Of the Silica/spions Ratios On Morphologysupporting

confidence: 93%

Preparation and characterization of functional silica hybrid magnetic nanoparticles

Digigow

Dechézelles

Dietsch

et al. 2014

Journal of Magnetism and Magnetic Materials

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We report on the synthesis and characterization of functional silica hybrid magnetic nanoparticles (SHMNPs). The co-condensation of 3-aminopropyltriethoxysilane (APTES) and tetraethyl orthosilicate (TEOS) in presence of superparamagnetic iron oxide nanoparticles (SPIONs) leads to hybrid magnetic silica particles that are surface-functionalized with primary amino groups. In this work, a comprehensive synthetic study is carried out and completed by a detailed characterization of hybrid particles' size and morphology, surface properties, and magnetic responses using different techniques. Depending on the mass ratio of SPIONs and the two silanes (TEOS and APTES), we were able to adjust the number of surface amino groups and tune the magnetic properties of the superparamagnetic hybrid particles.

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Section: Influence Of the Silica/spions Ratios On Morphologysupporting

confidence: 93%

Preparation and characterization of functional silica hybrid magnetic nanoparticles

Digigow

Dechézelles

Dietsch

et al. 2014

Journal of Magnetism and Magnetic Materials

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“…Silica nanospheres were synthesized according to our previous procedure. 2 1.5 g as-synthesized silica nanospheres (dried at 120 o C for 4 h) was dispersed into toluene (8 mL). Into this suspension, a mixture of 4.5 mmol (MeO)3SiCH3 and 4.5 mmol (C2H5)3N were added.…”

Section: Materials Synthesismentioning

confidence: 99%

“…(p0/q0). Then the distance of color change x is given by (2) where the flow rate is 2 mL h -1 , the radius of the column is 0.67 cm, the volume fraction of oil ɸ = 1/3, the ratio of the initial concentration acid to base in the two types of droplets λ=0.01. According to eq.…”

Section: Oilmentioning

confidence: 99%

Compartmentalized Droplets for Continuous Flow Liquid–Liquid Interface Catalysis

et al. 2016

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To address the limitations of batch organic-aqueous biphasic catalysis, we develop a conceptually novel method termed Flow Pickering Emulsion, or FPE, to process biphasic reactions in a continuous flow fashion. This method involves the compartmentalization of bulk water into micron-sized droplets based on a water-in-oil Pickering emulsion, which are packed into a column reactor. The compartmentalized water droplets can confine water-soluble catalysts, thus "immobilizing" the catalyst in the column reactor, while the interstices between the droplets allow the organic (oil) phase to flow. Key fundamental principles underpinning this method such as the oil phase flow behavior, the stability of compartmentalized droplets and the confinement capability of these droplets toward water-soluble catalysts are experimentally and theoretically investigated. As a proof of this concept, case studies including a sulfuric acid-catalyzed addition reaction, a heteropolyacid-catalyzed ring opening reaction and an enzyme-catalyzed chiral reaction demonstrate the generality and versatility of the FPE method. Impressively, in addition to the excellent durability, the developed FPE reactions exhibit up to 10-fold reaction efficiency enhancement in comparison to the existing batch reactions, indicating a unique flow interface catalysis effect. This study opens up a new avenue to allow conventional biphasic catalysis reactions to access more sustainable and efficient flow chemistry using an innovative liquid-liquid interface protocol.

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“…2, curve 5), the PL spectrum con tains two broad bands with energies of 2.4 and 2.7-3.1 eV. In many publications [7,[19][20][21][22][25][26][27][28][29], the luminescence observed in the range 2.7-3.1 eV is explained by the presence of oxygen defects and impu rities of carbon in SiO 2 . The observed decrease in the PL intensity in the range 2.7-3.1 eV (Fig.…”

Section: Resultsmentioning

confidence: 93%

Luminescence induced in diamond by He+ ion implantation into SiC/C composites with an inverse opal structure

et al. 2012

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The photoluminescence induced in diamond by helium ion implantation into SiC/C nanocom posite samples and their structure revealed by high resolution transmission electron microscopy have been investigated. It has been found that, apart from crystallites of silicon carbide, graphite, and amorphous car bon, in the structure of the composites there are spherical carbon particles containing concentric graphite like shells (onion like particles). It has been established that onion like particles are formed during high tem perature treatment of SiC/C nanocomposites in the course of their preparation. It has been shown that, after the implantation with the subsequent thermal treatment, nanocomposite samples exhibit a luminescence characteristic of N-V centers in diamonds. The assumption has been made that the diamond crystallites are formed at the center of onion like particles during high temperature treatment of the composite.

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Tunable photoluminescence in monodisperse silica spheres

Cited by 33 publications

References 35 publications

Preparation and characterization of functional silica hybrid magnetic nanoparticles

Preparation and characterization of functional silica hybrid magnetic nanoparticles

Compartmentalized Droplets for Continuous Flow Liquid–Liquid Interface Catalysis

Luminescence induced in diamond by He+ ion implantation into SiC/C composites with an inverse opal structure

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