Double-jet precipitation synthesis of CaF2 nanoparticles: The effect of temperature, solvent, and stabilizer on size and morphology

Сафронихин, А. В.; Ehrlich, H. V.; Лисичкин, Г. В.

doi:10.1016/j.jallcom.2016.10.128

Cited by 19 publications

(5 citation statements)

References 61 publications

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“…Further research is needed to determine the precise process underlying the nanoparticle creation 7 , 11 . AgNPs are not very stable in humid environments 25 , 26 . The key to successful silver nanoparticle preparation is preventing the development of aggregates.…”

Section: Introductionmentioning

confidence: 99%

Potent biological activity of newly fabricated silver nanoparticles coated by a carbon shell synthesized by electrical arc

Elwakil,

Eldrieny,

Almotairy

et al. 2024

Sci Rep

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Highly effective AgNPs@C was efficiently synthesized by electrical arc powered by single spark unit which was sufficient to ionize the dielectric media (deionized water) through applying strong electric field between the electrodes (silver and carbon). The AgNPs@C shell was characterized in terms of stability, morphology and phase structure. All characterizations showed that the prepared silver nanoparticles were spherical with average size reached 17 nm coated with carbon shell. The antibacterial effect of the synthesized nanoparticles was tested against Pseudomonas aeruginosa in comparison to Ceftazidime (commonly used antibiotic against P. aeruginosa infections). It was revealed that AgNPs@C shell has superior activity with inhibition zone diameter reached 15 mm and minimum inhibitory concentration reached 2 µg/mL. The observed activity was further confirmed by confocal microscope which showed an increased red region, representing the dead cells, correlated with the presence of AgNPs@C. Moreover, transmission electron microscope studies implied the possible AgNPs@C antibacterial mechanism of action was the nanoparticles adherence to the bacterial membrane causing cell lysis. The molecular studies against fimH (virulence adhesion gene), rmpA (mucoid factor encoding gene), and mrkA (biofilm forming gene) proved the inhibition of their genetic expression. The cytotoxic effect of the synthesized AgNPs@C showed CC50 reached 235.5 μg/mL against normal lung cells (L929 cell line).

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Section: Introductionmentioning

confidence: 99%

Potent biological activity of newly fabricated silver nanoparticles coated by a carbon shell synthesized by electrical arc

Elwakil,

Eldrieny,

Almotairy

et al. 2024

Sci Rep

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show abstract

“…The characteristic of this structure is that the body-centered position of the cubic sublattice constructed of F – is occupied by every other Ca 2+ , resulting in more gap positions in the lattice and lower activation energy to the formation of gap anions. Therefore, trivalent rare earth cations with ionic radii similar to that of Ca 2+ can be successfully incorporated into the crystal lattice . It is desired for the high-performance rare earth doped phosphors to achieve homogeneous doping of ions in the host matrixes and a uniform particle size distribution (PSD) …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, trivalent rare earth cations with ionic radii similar to that of Ca 2+ can be successfully incorporated into the crystal lattice. 23 It is desired for the high-performance rare earth doped phosphors to achieve homogeneous doping of ions in the host matrixes and a uniform particle size distribution (PSD). 24 As is known, the uniform spatial concentration distribution and higher supersaturation degree in the reactive precipitation process are beneficial to homogeneous nucleation and smaller particle size.…”

Section: Introductionmentioning

confidence: 99%

High-Gravity-Assisted Intensified Preparation of Er-Doped and Yb/Er-Codoped CaF₂ Upconversion Nanophosphors for Noncontact Temperature Measurement

Cao

Hu²,

Wang

et al. 2022

Ind. Eng. Chem. Res.

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Rare earth ion doped upconverison (UC) luminescence nanophosphors have attracted much attention owing to their wide applications. It is known that homogeneous doping of ions in matrixes and particle size distribution (PSD) determine the luminescent properties. In this study, we reported a novel approach to prepare CaF2:Er3+ and CaF2:Yb3+/Er3+ UC nanophosphors by high-gravity reactive precipitation in a rotating packed bed (RPB) combining hydrothermal process, which is applied for noninvasive temperature detection. The intensified micromixing in the RPB reactor contributes to the achievement of CaF2 nanoparticles with a narrower PSD, more homogeneous doping of Er3+ and Yb3+ ions in the CaF2 matrix, and higher doping efficiency compared to a conventional stirred tank reactor (STR). In particular, the luminescent intensities of the as-prepared CaF2:Er3+(2%) and CaF2:Yb3+(10%)/Er3+(1%) are respectively 12 and 2 times higher than those of the corresponding products prepared in the STR. Furthermore, the maximum absolute sensitivity of RPB-prepared CaF2:Yb3+(10%)/Er3+(1%) is calculated to be 0.0049 K–1, comparable with those of other reported Yb3+/Er3+-codoped materials. This exhibits a great potential of CaF2:Yb3+/Er3+ UC nanophosphors as promising noncontact temperature measuring materials.

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“…Meanwhile, CaF 2 host materials have an important application in dental medicine, [4] multifunctional nanoprobes in vitro and in vivo, [5] transparent laser ceramics, [6] enhance thermal conductivity of a composite, [7] et al What's more, like other lanthanide-based host materials such as LnF 3 or ALnF 4 (where A = Li, Na, K), CaF 2 is a potential host for phosphors with excellent up/down-conversion luminescent properties. [8] Firstly, the edge of the fundamental absorption band in CaF 2 lies in the vacuum UV at ∼ 12 eV. [9] Secondly, the low phonon energy of CaF 2 could minimize multi-phonon de-excitation probabilities.…”

Section: Introductionmentioning

confidence: 99%

Fluorescent Enhancement of CaF₂: Nd³⁺ Nanoparticles through a Concentration‐Gradient Core/Shell Hybrid Structure

Tan

Wang

et al. 2021

ChemistrySelect

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In this contribution, we provided an efficient core/shell structure for CaF2 : Nd3+ based core/shell NPs, which has several traits below: hybrid core; homogeneous or heterogeneous core‐host and shell‐host; concentration‐gradient distribution of both doping ions and activator from inner to outer shell layer. Finally, A successive layer‐by‐layer doping method was utilized to synthesize various core‐based and concentration‐gradient hybrid Ce3+, Li+ and activator (Nd3+) shell layer core/shell(C/S) NPs, which could enhance the fluorescence of the CaF2 : 6Nd(mol %) C/S NPs up to 21.4 times than that of core‐only NPs by doping much denser hybrid Ce3+ and activator Nd3+ in per unit volume and overcoming surface quenching.

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Double-jet precipitation synthesis of CaF2 nanoparticles: The effect of temperature, solvent, and stabilizer on size and morphology

Cited by 19 publications

References 61 publications

Potent biological activity of newly fabricated silver nanoparticles coated by a carbon shell synthesized by electrical arc

Potent biological activity of newly fabricated silver nanoparticles coated by a carbon shell synthesized by electrical arc

High-Gravity-Assisted Intensified Preparation of Er-Doped and Yb/Er-Codoped CaF₂ Upconversion Nanophosphors for Noncontact Temperature Measurement

Fluorescent Enhancement of CaF₂: Nd³⁺ Nanoparticles through a Concentration‐Gradient Core/Shell Hybrid Structure

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Double-jet precipitation synthesis of CaF2 nanoparticles: The effect of temperature, solvent, and stabilizer on size and morphology

Cited by 19 publications

References 61 publications

Potent biological activity of newly fabricated silver nanoparticles coated by a carbon shell synthesized by electrical arc

Potent biological activity of newly fabricated silver nanoparticles coated by a carbon shell synthesized by electrical arc

High-Gravity-Assisted Intensified Preparation of Er-Doped and Yb/Er-Codoped CaF2 Upconversion Nanophosphors for Noncontact Temperature Measurement

Fluorescent Enhancement of CaF2: Nd3+ Nanoparticles through a Concentration‐Gradient Core/Shell Hybrid Structure

Contact Info

Product

Resources

About

High-Gravity-Assisted Intensified Preparation of Er-Doped and Yb/Er-Codoped CaF₂ Upconversion Nanophosphors for Noncontact Temperature Measurement

Fluorescent Enhancement of CaF₂: Nd³⁺ Nanoparticles through a Concentration‐Gradient Core/Shell Hybrid Structure