Samples of SrAl2O4:Eu2+(SAOE) powders have been synthesized by a solid state reaction method and their structural and luminescent properties were *** XRD patterns of the reveal that it exhibits a single SrAl2O4 crysta...
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Samples of SrAl2O4:Eu2+(SAOE) powders have been synthesized by a solid state reaction method and their structural and luminescent properties were *** XRD patterns of the reveal that it exhibits a single SrAl2O4 crystalline phase when the replaced SrCO3 by the SrCl2 is lower than 8%.The photoluminescence (PL) results reveal that the peak of the emission band is located at 515 nm,which belong to the d-f transition of Eu2+ *** important,the PL spectra of the SAOE samples are strongly enhanced with the substituted of *** was found that the optimal emission intensity was obtained when the 4% SrCO3 replaced by SrCl2 as raw materials.A possible mechanism of enhanced phosphor is discussed
Here we report the fabrication and superconductivity of the iron-based arsenic oxide SmO1-xFxFeAs compound. X-ray diffraction （XRD） results prove that the lattice parameters a and c decrease systematically with incr...
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Here we report the fabrication and superconductivity of the iron-based arsenic oxide SmO1-xFxFeAs compound. X-ray diffraction （XRD） results prove that the lattice parameters a and c decrease systematically with increasing x in between 0〈x≤0.35, but when x〉0.35 the a and c increase with the decrease of x in the SmO1-xFxFeAs. The critical temperature （To） increases with increasing x in between 0.15≤x≤0.3, while x〉0.3 the Tc decreases with the increase ofx. It is found that at x=0.3 SmO0.7F0.3FeAs has the highest onset resistivity transition temperature of 55.5 K. The critical current density （Jc） value at 10 K for the obtained ***0.3FeAs is 1.3×10^5 A/cm^2 （0 T）. Meanwhile one can estimates Hc2（0） from the slope of the Hc2（T） curve at T=-Tc （Hc2 is the upper critical field）, and for the 90% normal-state resistivity （Pn） criterion （Tc=55 K）, Hc2（0） is determined to be -253 T.
Thermal images were observed while irradiating a laser beam on thyroid cancer cells treated with gold nanorods submerged in phosphate buffered saline. Cancer cells were found to be dead only in the irradiation area.
Thermal images were observed while irradiating a laser beam on thyroid cancer cells treated with gold nanorods submerged in phosphate buffered saline. Cancer cells were found to be dead only in the irradiation area.
The luminescent reduced graphene oxide small sheets (average diameter: 30–50 nm) are prepared by using a simple and eco-friendly solvothermal process, and show an obvious excitation-dependent PL emission as th...
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The luminescent reduced graphene oxide small sheets (average diameter: 30–50 nm) are prepared by using a simple and eco-friendly solvothermal process, and show an obvious excitation-dependent PL emission as the excitation wavelength varies from 300 to 500 nm. In particular, under excitation at 340 nm, a strongest blue emission occurs, whose quantum yield reaches ca. 3.2% as Rhodamine B is used as a reference. This offers a simple pathway to prepare the luminescent reduced graphene oxide small sheets. Furthermore, the emission exhibits a good resistance to the change of pH for the surroundings, which could be beneficial to the practical applications in the field of optoelectronics, and molecule detection.
Polycrystalline rare-earth hexaborides （NdxGdl-x）B6 （x = 0, 0.2, 0.6, 0.8, 1） were prepared by the reactive spark plasma sintering （SPS） method using mixed powder of GdH2, NdH2 and B. The effects of Nd doping on...
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Polycrystalline rare-earth hexaborides （NdxGdl-x）B6 （x = 0, 0.2, 0.6, 0.8, 1） were prepared by the reactive spark plasma sintering （SPS） method using mixed powder of GdH2, NdH2 and B. The effects of Nd doping on the crystal structure, the grain orientation, the thermionie emission and the magnetic properties of the hexaboride were investigated by X-ray diffraction, electron backscattered diffraction and magnetic measurements. It is found that all the samples sintered by the SPS method exhibit high densities （〉95%） and high values of Vickers hardness （2319 kg/mm2）. The values are much higher than those obtained in the traditional method. With the increase of Nd content,the thermionic emission current density increases from 11 to 16.30 A/cm2 and the magnetic phase transition temperature increases from 5.85 to 7.95 K. Thus, the SPS technique is a suitable method to synthesize the dense rare-earth hexaborides with excellent properties.
Large-sized and high-quality cerium hexaboride(CeB6)single crystals are successfully grown by the optical floating zone *** structure,chemical composition and thermionic emission properties of the crystal are characte...
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Large-sized and high-quality cerium hexaboride(CeB6)single crystals are successfully grown by the optical floating zone *** structure,chemical composition and thermionic emission properties of the crystal are characterized by x−ray diffraction,x-ray fluorescence and emission measurements,*** on the observation of single crystal diffraction,the relative density of feed rods has a great effect on the quality of the grown *** thermionic emission measurement results show that the emission current density of the single crystal is 47.1 A/cm^(2) at 1873 K with an applied voltage of 1 kV,which is about two times larger than the value for polycrystalline *** single crystal possesses excellent emission current ***,it is expected that CeB6 single crystal is a very promising material for thermionic cathode applications.
This paper presents experimental results on the effect of alkalis such as NaOH, KOH and Ca（OH）2 on deacetylation of a konjac glucomannan （KGM） powder under mechano-chemical （MC） treatment, The results show that ...
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This paper presents experimental results on the effect of alkalis such as NaOH, KOH and Ca（OH）2 on deacetylation of a konjac glucomannan （KGM） powder under mechano-chemical （MC） treatment, The results show that the alkalinity of modifiers is a dominant factor for deacetylation of KGM, In addition, characteristics, such as swelling property, viscous stability and thermal behavior of the deacetylated KGM are analyzed
We measure the transport properties of mechanically strained single crystals of BaFe2(As1−xPx)2 over a wide range of x. The Néel transition is extremely sensitive to stress and this sensitivity increases as optim...
We measure the transport properties of mechanically strained single crystals of BaFe2(As1−xPx)2 over a wide range of x. The Néel transition is extremely sensitive to stress and this sensitivity increases as optimal doping is approached (doping with the highest superconducting Tc), even though the magnetic transition itself is strongly suppressed. Furthermore, we observe significant changes in the superconducting transition temperature with applied strain, which mirror changes in the composition x. These experiments are a direct illustration of the intimate coupling between different degrees of freedom in iron-based superconductors, revealing the importance of magnetoelastic coupling to the magnetic and superconducting transition temperatures.
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