Luminescent silicate core–shell nanoparticles: Synthesis, functionalization, optical, and structural properties

Dembski, Sofia; Rupp, Sabine; Gellermann, Carsten; Batentschuk, Miroslaw; Osvet, Andres; Winnacker, A.

doi:10.1016/j.jcis.2011.01.060

Cited by 14 publications

(15 citation statements)

References 51 publications

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“…Silica cores of various size were prepared by the modified Stoeber method, the details of which have been published elsewhere [9,10]. Shortly, the TEOS was hydrolyzed in ethanol in the presence of ammonium hydroxide; the mixture was subsequently aged at RT.…”

Section: Methodsmentioning

confidence: 99%

Photostimulable Fluorescent Nanoparticles for Biological Imaging

et al. 2011

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Spherical monodisperse core/shell-type nanoparticles, comprising an amorphous SiO 2 core coated with a luminescent phosphor layer were synthesized by the modified Pechini processes. The sol-gel method allows covering the 50 -500 nm core particles with different inorganic phosphor layers of about 10 nm thickness, doped with rare-earth or transition metal ions which determine the luminescent properties. Particles comprising a Zn 2 SiO 4 shell, doped with Mn 2+ ions, are not only fluorescent under UV irradiation (260 nm), but store the activation energy by trapping electrons/holes at lattice defects. This energy is released as phosphorescence in the time scale of seconds and minutes, or as photostimulated luminescence under the excitation of red light (650 nm). Traps related to these processes are different, and their concentration is affected by the preparation conditions of the particles.

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Section: Methodsmentioning

confidence: 99%

Photostimulable Fluorescent Nanoparticles for Biological Imaging

et al. 2011

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“…46,47 2.1.2 Silica particles. All incorporated particles were synthesized via a modied Stoeber process according to Dembski et al 48 and Milde et al 49 In the synthesis process of silica particles, 225 g of the precursor tetraethoxysilane (TEOS, 98%, Sigma-Aldrich Chemie GmbH, Germany) is hydrolyzed in 4.5 L ethanol (Sigma-Aldrich Chemie GmbH, Germany) and 225 mL of the catalyst ammonium hydroxide (NH 4 OH 25%, Fluka®, Honeywell International, Inc., USA). During aging at RT for 3 days, hydrolysis and condensation reaction of the silanol groups enable the formation of colloidal silica particles.…”

Section: Sample Preparationmentioning

confidence: 99%

Tailored nanotopography of photocurable composites for control of cell migration

et al. 2021

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“…By means of silanization the polarity can be adapted as needed, also positive for example by for example by silanization with an aminosilan. [17] Once the method has been established, which is shown in this current proof of principle study, it can easily be upgraded by adding state of the art aerosol generators and spectrometers in order to better control and study droplet size related effects.…”

Section: Our Approach In Detailmentioning

confidence: 99%

“…By means of silanization the polarity can be adapted as needed, also positive for example by for example by silanization with an aminosilan. [ 17 ]…”

Section: Introductionmentioning

confidence: 99%

A Simple Model Setup Using Spray‐Drying Principles and Fluorescent Silica Nanoparticles to Evaluate the Efficiency of Facemask Materials in Terms of Virus Particle Retention

Oppmann

Wenderoth

Ballweg

et al. 2021

Adv Materials Technologies

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Herein, a simple model setup is presented to spray fine liquid droplets containing nanoparticles in an air stream transporting this toward a filter material. The nanoparticles are made of silica and tagged with a fluorescent dye in order to render the trace of the particles easily visible. The silica nanoparticles, in a first approximation, mimic virus (severe acute respiratory syndrome coronavirus 2) particles. The setup is used to evaluate different tissues, nowadays, in times of the coronavirus pandemic, commonly used as facemasks, with regard to their particle retention capability. The setup enables adjusting different “breathing scenarios” by adjusting the gas flow speed and, thereby, to compare the filter performance for these scenarios. The effective penetration of particles can be monitored via fluorescence intensity measurements and is visualized via scanning electron micrographs and photographs under UV light. Ultimately, a strong increase of particle penetration in various mask materials as function of flow speed of the droplets is observed and an ultimate retention is only observed for FFP3 and FFP2 masks.

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Luminescent silicate core–shell nanoparticles: Synthesis, functionalization, optical, and structural properties

Cited by 14 publications

References 51 publications

Photostimulable Fluorescent Nanoparticles for Biological Imaging

Photostimulable Fluorescent Nanoparticles for Biological Imaging

Tailored nanotopography of photocurable composites for control of cell migration

A Simple Model Setup Using Spray‐Drying Principles and Fluorescent Silica Nanoparticles to Evaluate the Efficiency of Facemask Materials in Terms of Virus Particle Retention

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