On a local (de-)trapping model for highly doped Pr3+ radioluminescent and persistent luminescent nanoparticles

Nanoscale ◽  
2020 ◽  
Vol 12 (40) ◽  
pp. 20759-20766
Author(s):  
Gabrielle A. Mandl ◽  
David Van der Heggen ◽  
Daniel R. Cooper ◽  
Jonas J. Joos ◽  
Jan Seuntjens ◽  
...  
Keyword(s):  
Persistent Luminescence ◽  
X Ray ◽  
Size Dependent ◽  
Trapping Model ◽  
Luminescent Nanoparticles

NaLuF4:20% Pr3+ nanoparticles exhibit size dependent persistent luminescence along with changes in radioluminesence intensity during X-ray irradiation. These observations can be accounted for using a local trapping model.

scholarly journals Exposure Media and Nanoparticle Size Influence on the Fate, Bioaccumulation, and Toxicity of Silver Nanoparticles to Higher Plant Salvinia minima

Molecules ◽  
2021 ◽  
Vol 26 (8) ◽  
pp. 2305
Author(s):  
Melusi Thwala ◽  
Stephen Klaine ◽  
Ndeke Musee
Keyword(s):  
Silver Nanoparticles ◽  
Analytical Techniques ◽  
Hard Water ◽  
Higher Plant ◽  
X Ray ◽  
Chlorophyll Pigments ◽  
Size Dependent ◽  
Predicted Environmental Concentrations ◽  
Low Exposure ◽  
Toxicity Pattern

Silver nanoparticles (AgNPs) are favoured antibacterial agents in nano-enabled products and can be released into water resources where they potentially elicit adverse effects. Herein, interactions of 10 and 40 nm AgNPs (10-AgNPs and 40-AgNPs) with aquatic higher plant Salvinia minima at 600 µg/L in moderately hard water (MHW), MHW of raised calcium (Ca2+), and MHW containing natural organic matter (NOM) were examined. The exposure media variants altered the AgNPs’ surface properties, causing size-dependent agglomeration. The bio-accessibility in the ascending order was: NOM < MHW < Ca2+, was higher in plants exposed to 10-AgNPs, and across all exposures, accumulation was higher in roots compared to fronds. The AgNPs reduced plant growth and the production of chlorophyll pigments a and b; the toxic effects were influenced by exposure media chemistry, and the smaller 10-AgNPs were commonly the most toxic relative to 40-AgNPs. The toxicity pattern was linked to the averagely higher dissolution of 10-AgNPs compared to the larger counterparts. The scanning electron microscopy and X-ray fluorescence analytical techniques were found limited in examining the interaction of the plants with AgNPs at the low exposure concentration used in this study, thus challenging their applicability considering the even lower predicted environmental concentrations AgNPs.

Size dependent behavior of Fe3O4crystals during electrochemical (de)lithiation: an in situ X-ray diffraction, ex situ X-ray absorption spectroscopy, transmission electron microscopy and theoretical investigation

2017 ◽  
Vol 19 (31) ◽  
pp. 20867-20880 ◽  
Author(s):  
David C. Bock ◽  
Christopher J. Pelliccione ◽  
Wei Zhang ◽  
Janis Timoshenko ◽  
K. W. Knehr ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Structural Changes ◽  
Ex Situ ◽  
X Ray Diffraction ◽  
X Ray ◽  
Size Dependent ◽  
Transmission Electron ◽  
Dependent Behavior ◽  
X Ray Absorption

Crystal and atomic structural changes of Fe3O4upon electrochemical (de)lithiation were determined.

scholarly journals Super Long Green Persistent Luminescence from X-Ray Excited β-NaYF4: Tb3+

2019 ◽  
Author(s):  
Yue Hu ◽  
Yanmin Yang ◽  
Xiaoxiao Li ◽  
Xin Wang ◽  
Yunqian Li ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Light Source ◽  
Green Emission ◽  
Persistent Luminescence ◽  
Tunneling Model ◽  
X Ray ◽  
Long Afterglow ◽  
Photo Stability ◽  
F Centers

Here, we have discovered a X-ray excited long afterglow phosphor &beta;-NaYF4: Tb3+. After the irradiation of X-ray, the green emission can persist for more than 240 h. After 36 h, the afterglow intensity arrived at 0.69 mcd&bull;m-2, which can clearly be observed by naked eyes. Even after 84 h, the afterglow emission brightness still reached 0.087 mcd&bull;m-2. Also, combined with the results of thermoluminescence and photoluminescence, the super long afterglow emission of &beta;-NaYF4: Tb3+ can be ascribed to the tunneling model associated with F centers. More importantly, the super long green afterglow emission of &beta;-NaYF4: Tb3+ has been successfully used as in vivo light source to activate g-C3N4 for photodynamic therapy（PDT）and bacteria destruction. Furthermore, super long persistent luminescence of &beta;-NaYF4: Tb3+ could be repeatedly charged by X-ray for many circulations, which indicates that the phosphors have high photo stability under repeated cycles of alternating X-ray irradiation.

Site-Specific and Size-Dependent Bonding of Compositionally Precise Gold−Thiolate Nanoparticles from X-ray Spectroscopy

2010 ◽  
Vol 1 (12) ◽  
pp. 1821-1825 ◽  
Author(s):  
Mark A. MacDonald ◽  
Peng Zhang ◽  
Huifeng Qian ◽  
Rongchao Jin
Keyword(s):  
Site Specific ◽  
X Ray ◽  
Size Dependent ◽  
Gold Thiolate

scholarly journals X‐Ray‐Induced Persistent Luminescence Promotes Ultrasensitive Imaging and Effective Inhibition of Orthotopic Hepatic Tumors

2020 ◽  
Vol 30 (24) ◽  
pp. 2001166 ◽  
Author(s):  
Tianhang Shi ◽  
Wenjing Sun ◽  
Ruixue Qin ◽  
Dongsheng Li ◽  
Yushuo Feng ◽  
...  
Keyword(s):  
Persistent Luminescence ◽  
Hepatic Tumors ◽  
X Ray ◽  
Effective Inhibition

Size-dependent lattice structure of palladium studied by x-ray absorption spectroscopy

2007 ◽  
Vol 75 (12) ◽  
Author(s):  
Chih-Ming Lin ◽  
Tsu-Lien Hung ◽  
Yen-Heng Huang ◽  
Kung-Te Wu ◽  
Mau-Tsu Tang ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Lattice Structure ◽  
X Ray ◽  
Size Dependent ◽  
X Ray Absorption

Self-Connected Cds Nanocrystals as Precursors for Anisotropic Semiconducting Films

1994 ◽  
Vol 346 ◽  
Author(s):  
A. Chemseddine
Keyword(s):  
Heat Treatment ◽  
Optical Absorption ◽  
Band Gap ◽  
Polymeric Material ◽  
Fibrous Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Size Dependent ◽  
Cds Nanocrystals ◽  
Cds Films

ABSTRACTMonosized and anisotropically capped CdS nanocrystals have the property to self-connect into a polymeric material. The viscosity of this fibrous material can be adjusted to fabricate texturized and homogeneous coatings. These films can be thermally converted into pure CdS films. Based on the size dependent band gap of this semiconductor, the absorbance of the film can be fine-tuned through the size of the particle-precursor or by controlling the film heat treatment. The evolution of the film nanostructure with temperature was investigated by optical absorption, DTA, SEM and X-ray diffraction techniques.

Combinatorial high-energy x-ray microbeam study of the size-dependent oxidation of Pd nanoparticles on MgO(100)

2008 ◽  
Vol 77 (11) ◽  
Author(s):  
P. Nolte ◽  
A. Stierle ◽  
N. Kasper ◽  
N. Y. Jin-Phillipp ◽  
H. Reichert ◽  
...  
Keyword(s):  
Pd Nanoparticles ◽  
High Energy ◽  
X Ray ◽  
Size Dependent

Synthesis and Characterization of BiFeO3 Ceramic by Simple and Novel Methods

2016 ◽  
Vol 35 (6) ◽  
pp. 551-557 ◽  
Author(s):  
Omid Amiri ◽  
Mohammad Reza Mozdianfar ◽  
Mahmoud Vahid ◽  
Masoud Salavati-Niasari ◽  
Sousan Gholamrezaei
Keyword(s):  
Magnetic Properties ◽  
Domain Walls ◽  
Magnetic Domain ◽  
X Ray Diffraction ◽  
X Ray ◽  
Size Dependent ◽  
Magnetic Domain Walls ◽  
Magnetization Orientation ◽  
Thermal Stability Of

AbstractBiFeO3 nanopowders with new morphology have been synthesized by different methods. X-ray diffraction analysis, scanning electron microscopy, Fourier transform infrared and vibrating sample magnetometer were carried out at room temperature to study the structural and magnetic properties of as-synthesized products. VSM was utilized to measure the size-dependent magnetic behaviors of the as-prepared nanoparticles. Results show that the method has strong effect on the purity of the products. BFO synthesized by third method was pure. Crystallite size has a great effect on the magnetic properties. According to these results the nanoparticle diameter is smaller than the critical single-domain diameter, avoiding the configuration of magnetic domain walls decreases the magnetization. Even though the diameter of particle becomes even smaller, the thermal stability of the magnetization orientation decreases.

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