Tunable luminescence and cytotoxicity of Samarium-doped calcium–strontium–hydroxyapatite for cell imaging

2021 ◽  
Author(s):  
Yinpo Qiao
Keyword(s):  
Particle Size ◽  
Cell Imaging ◽  
Strontium Hydroxyapatite ◽  
Radiative Transitions ◽  
Dipole Interactions ◽  
Energy Transfers ◽  
Diffraction Peaks ◽  
Orange Color ◽  
Luminescence Performance ◽  
Color Emission

Samarium (Sm)-doped calcium–strontium–hydroxyapatite (Ca–Sr–HA:Sm) materials were designed and prepared, and the influence of Sr-introduction on the structure, photoluminescence (PL) and cytotoxicity of samples was revealed. The Sr-doping deduces the shift of some diffraction peaks to smaller angles and enlarges the particle size of samples. The typical red– orange emissions and corresponding luminescence quenching of Sm[Formula: see text] were observed, and the optimal luminescence performance appeared when [Formula: see text](Sr) = 7(Sr/Ca = 7/3) and quenching concentration closes to [Formula: see text](Sm) = 0.8 mol.%. The non-radiative transitions and energy transfers due to the dipole–dipole interactions between ions with different symmetry are essential to the luminescence and quenching of Sm[Formula: see text]. Furthermore, the viability values of human HepG2 cells are calculated larger than 90%, and the red–orange color emission was observed when the particles are incubated with cells.

SIZE-DEPENDENT UPCONVERSION PROPERTIES OF Er3+ DOPED NANO Y2O3 PARTICLES

2011 ◽  
Vol 25 (04) ◽  
pp. 265-272 ◽  
Author(s):  
SIGUO XIAO ◽  
XIAOLIANG YANG
Keyword(s):  
Particle Size ◽  
Intensity Ratio ◽  
Radiative Decay ◽  
Luminescence Properties ◽  
Small Particles ◽  
Decay Probability ◽  
Size Dependent ◽  
Energy Transfers ◽  
Nano Crystal

Size-dependent upconversion properties for Er 3+-doped Y 2 O 3 nano-crystal have been investigated. The investigation shows that the reduction of the particle size intensifies the hypersensitive 2 H 11/2 → 4 I 15/2 transition, decreasing the intensity ratio of the 4 S 3/2 → 4 I 15/2 transition to the 2 H 11/2 → 4 I 15/2 one. The enhanced non-radiative decay probability and the intensified energy transfers in the small particles also enhance the population of the 4 F 9/2 level, leading to the increase of the intensity ratio of the red to the green one. It is believed that the absorbed hydroxyl and carbonate groups on the surface as well as the lowered symmetry of the local surroundings of the doped Er 3+ ions near the surface result in the size-dependent luminescence properties in the nano-crystal.

X-Ray Profile Analysis of 12% Chromium Stainless Steel

1993 ◽  
Vol 37 ◽  
pp. 351-358
Author(s):  
Zenjxo Yajima ◽  
Ken-ichi Ishikawa ◽  
Toshihiko Sasaki ◽  
Yukio Hirose
Keyword(s):  
Particle Size ◽  
Structural Changes ◽  
Lattice Strain ◽  
Profile Analysis ◽  
Good Method ◽  
Small Particle Size ◽  
Line Broadening ◽  
X Ray ◽  
Diffraction Peaks ◽  
Chromium Stainless Steel

X-ray line broadening is caused by variations in lattice strain and small particle size. When hydrogen is introduced into the steel by the electrolytica! method, structural changes are observed. X-ray line broadening is a suitable measurement in such cases. The Warren and Averbach Fourier analysis is a good method for line broadening studies. In this method, strain and particle size effects can be separated because broadening due to particle size is independent of order of the diffraction peaks, while broadening due to strain is not.

scholarly journals Preparation and Characterization of Colon-Targeted Particles of Pulsatilla chinensis Saponins

2015 ◽  
Vol 10 (2) ◽  
pp. 1934578X1501000 ◽  
Author(s):  
Zhenhua Chen ◽  
Yongmei Guan ◽  
Leilei Zhou ◽  
Ying Xu ◽  
Ming Yang ◽  
...  
Keyword(s):  
Ulcerative Colitis ◽  
Particle Size ◽  
Surface Characteristics ◽  
Shell Structures ◽  
Composite Particles ◽  
Core Shell ◽  
Eudragit S100 ◽  
Pulsatilla Chinensis ◽  
Diffraction Peaks

Pulsatilla chinensis (Bunge) Regel is a traditional Chinese medicine used to treat ulcerative colitis. This study prepared and characterized colon-targeted particles of P. chinensis saponins by particle design. Most of the P. chinensis saponins in the composite particles were coated with Eudragit S100, as seen in SEM micrographs; meanwhile, the characteristic diffraction peaks in X-RD, surface wettability, and particle size distribution of the composite particles were basically the same as those of Eudragit S100. These results suggested that the mechanochemical process could be used to prepare colon-targeted particles with core-shell structures with the drug coated by the excipient; the results also showed similar surface characteristics in the coating.

Techniques for the Determination of Particle Size and Texture in Retained Austenite / Martensite Microstructures and Interpretation of the Measurements

1995 ◽  
Vol 39 ◽  
pp. 473-479
Author(s):  
J. D. Makinson ◽  
W. N. Weins ◽  
Y. Xu ◽  
D. J. Medlin ◽  
R. V. Lawrence
Keyword(s):  
Particle Size ◽  
Retained Austenite ◽  
Quantitative Information ◽  
Manufacturing Processes ◽  
X Ray Diffraction ◽  
Steel Component ◽  
X Ray ◽  
Other Information ◽  
Diffraction Peaks

The measurement of retained austenite is important in the analysis and quality control of asmanufactured steel components, as well as to the evaluation of components returned from service. The amounts of retained austenite are most accurately measured using x-ray diffraction techniques where the integrated area under the austenite and martensite diffraction peaks from a sample are determined. In addition to quantitative information about the amount of each phase, however, the raw x-ray diffraction data contains other information that may be useful in evaluating the condition of a steel component. The diffracting particle size of both the martensite and austenite phases, and the presence and degree of preferred orientation in both phases can be calculated from the basic four peak retained austenite x-ray scan. This information, in conjunction with knowledge of the amount of retained austenite present, may be used to determine information about variations in materials and manufacturing processes as well as changes due to service. If the residual stress in both phases is also measured, additional conclusions can be made regarding changes due to processing and service. The theoretical and experimental aspects of these measurements are reviewed data from a case history in which these types of measurements were used to determine changes due to processing and service are presented.

scholarly journals Use of curcumin-modified diamond nanoparticles in cellular imaging and the distinct ratiometric detection of Mg2+/Mn2+ ions

2021 ◽  
Author(s):  
Bo Wei Du ◽  
Tien Le ◽  
Ching-Chang Lin ◽  
Fu-Hsiang Ko
Keyword(s):  
Particle Size ◽  
Cell Imaging ◽  
Cellular Imaging ◽  
Diamond Nanoparticles ◽  
Ratiometric Detection

An intrinsically luminescent curcumin-modified nanodiamond derivative (ND-Cur) has been synthesized as an effective probe for cell imaging and sensory applications. DLS data allowed the particle size of ND-Cur to be...

Up-Conversion in Yb,Er-Doped Y2O3 Nanoparticles for Cell Imaging

2007 ◽  
Vol 555 ◽  
pp. 383-388 ◽  
Author(s):  
Aurelie Bessière ◽  
Fabienne Pellé ◽  
Claire Mathieu ◽  
Bruno Viana ◽  
Philippe Vermaut
Keyword(s):  
Particle Size ◽  
Combustion Synthesis ◽  
Cell Imaging ◽  
Small Particles ◽  
Emission Efficiency ◽  
Direct Excitation ◽  
Er Doped

Y2O3:19%Yb,1%Er nanoparticles were synthesized with the aim of imaging the luminescent cell. Coprecipitation and combustion synthesis were used to obtain particulate sizes ranging from 25 up to 140 nm. The powders showed predominant red upconversion and the emission efficiency is controlled by the particle size. A colloidal route was also followed and 2-5 nm-large agglomerated nanoparticles were obtained. In that case, the luminescence of Er3+ was only observed by direct excitation and no upconversion light has been detected on these very small particles.

Fabrication and Spectroscopic Broadening Properties for 1.5 μm Amplification of Er3+-Doped BaF2 Nanoparticles

2008 ◽  
Vol 8 (3) ◽  
pp. 1380-1383 ◽  
Author(s):  
Hongzhou Lian ◽  
Jie Liu ◽  
Zeren Ye ◽  
Chunshan Shi
Keyword(s):  
Particle Size ◽  
Potential Application ◽  
Emission Spectra ◽  
Particle Sizes ◽  
Full Width ◽  
Half Maximum ◽  
Diffraction Angle ◽  
Diffraction Peaks ◽  
Xrd Patterns

We show the potential application of Er3+-doped BaF2 nanoparticles prepared from microemulsion technology for 1.5 μm amplification in telecommunication. Nanoparticles with different sizes of about 8, 10, and 20.5 nm were prepared. The XRD patterns showed the excursion of diffraction peaks. When the particle size is smaller or the diffraction angle is larger, this kind of excursion will be more serious. The emission bands of Er3+ at 1.54 μm for the three particle sizes at were as follows: 8 nm particles – 145 nm, 10 nm particles – 124 nm, and 20.5 nm particles – 82 nm (full width at half maximum, FWHM), or 173, 153, 97 nm (Δλeff), respectively. In all the three cases, the emission spectra were flat from 1.53 to 1.56 μm.

Influence of Sintering Temperature on the Structure of SrFeCoO3-δ Oxide

2012 ◽  
Vol 550-553 ◽  
pp. 2719-2722
Author(s):  
Su Qin Chen ◽  
Xiang Hong Huang
Keyword(s):  
Particle Size ◽  
Perovskite Structure ◽  
Sintering Temperature ◽  
Perovskite Phase ◽  
Experimental Results ◽  
Citrate Method ◽  
Different Temperatures ◽  
Diffraction Peaks

SrFeCoO3-δ oxides have been synthesized by citrate method and the effect of sintering temperature on the structure of the samples has been analyzed. The experimental results show that the samples sintered at different temperatures are mainly composed of SrFe0.5Co0.5O3 with perovskite structure. The impure phases decrease and the intensity of the diffraction peaks of the SrFe0.5Co0.5O3 perovskite phase increases with the increase of the sintering temperature. High pure SrFe0.5Co0.5O3 perovskite phase can be obtained after sintering at 1000°C and 1100°C. The particle size with irregular morphology increases with the increase of the sintering temperature.

Development of Reddish-Orange Color Emission Material from Barium Gadolinium Borate Glasses Doped with Eu2O3

2021 ◽  
Vol 222 (1) ◽  
pp. 273-282
Author(s):  
W. Boonpa ◽  
K. Kirdsiri ◽  
N. Wongdamnern ◽  
T. Sareein ◽  
Y. Sangsawat ◽  
...  
Keyword(s):  
Borate Glasses ◽  
Orange Color ◽  
Reddish Orange ◽  
Color Emission
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