Enhanced Visible Light-Driven Photocatalysis by Eu³⁺-Doping in BaNb₂V₂O₁₁ with Layered Mixed-Anion Structure

Qin, Lin,Cai, Peiqing,Chen, Cuili,Cheng, Han,Wang, Jing,Kim, Sun Il,Seo, Hyo Jin American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.24

<P>Europium- (Eu-) doped BaNb(2)V(2)O(11)powders with layered mixed -anion structure were prepared through the solid state method successfully. The obtained powders were characterized using X-ray powder diffraction (XRD), structural refinement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet visible (UV-vis) absorption spectra, and photoluminescence (PL) measurements. The experimental results demonstrate that BaNb2V2O11 powders could absorb the UV-vis light effectively with the band gap energy of 2.219 eV. The introduction of Eu5 in the host contributes to the decrease of the band gap energy (2.137 eV). Moreover, the photocatalytic activities of the obtained powders were evaluated through the photocatalytic degradation of the methylene blue (MB) solutions under visible light irradiation as a function of time. All the results indicate that the BaNb2V2O11 powders can be used as a potential visible -light -driven photo catalyst. Notably, due to the introduction of Eu3+, the photocatalytic degradation rate of MB solutions could be improved dramatically. The influence of the existence of Eu3+ on the photocatalytic properties is further discussed in detail based on the crystal structure characteristic.</P>

Optical performance of the Ba₅Al₃F₁₉:Eu²⁺ blue phosphors with high thermal stability

Qin, Lin,Cai, Peiqing,Chen, Cuili,Wang, Jing,Kim, Sun Il,Huang, Yanlin,Seo, Hyo Jin Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.738 No.-

<P><B>Abstract</B></P> <P>Ba<SUB>5</SUB>Al<SUB>3</SUB>F<SUB>19</SUB>:Eu<SUP>2+</SUP> blue-emitting phosphors were synthesized by the solid state reaction in a reductive atmosphere. The crystal structure of Ba<SUB>5</SUB>Al<SUB>3</SUB>F<SUB>19</SUB>:Eu<SUP>2+</SUP> phosphors were characterized by using the X-ray powder diffraction (XRD) measurement. The luminescence properties are investigated systematically based on the crystal structure. Emission and excitation spectra of the Ba<SUB>5</SUB>Al<SUB>3</SUB>F<SUB>19</SUB>:Eu<SUP>2+</SUP> phosphor along with the decay curves were characterized. Under the excitation of UV light, the phosphor exhibits a broad band emission around 410 nm ascribed to the allowed 4<I>f</I> <SUP>6</SUP>5<I>d</I>→4<I>f</I> <SUP>7</SUP>(<SUP>8</SUP>S<SUB>7/2</SUB>) transition, together with a sharp line at 360 nm corresponding to the forbidden 4<I>f</I> <SUP>7</SUP>(<SUP>6</SUP>P<SUB>7/2</SUB>)→4<I>f</I> <SUP>7</SUP>(<SUP>8</SUP>S<SUB>7/2</SUB>) transition of the Eu<SUP>2+</SUP> ions. The temperature dependent emission spectra and decay curves were measured to investigate the origins of the emission and the thermal stabilities of the as-prepared phosphors. The as-prepared Ba<SUB>5</SUB>Al<SUB>3</SUB>F<SUB>19</SUB>:Eu<SUP>2+</SUP> phosphors display interesting and stable luminescence properties, which can act as promising blue-emitting phosphor candidates.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We developed Ba<SUB>5</SUB>Al<SUB>3</SUB>F<SUB>19</SUB> fluoride by a simple solid state method. </LI> <LI> The phosphor exhibits a bright broad band emission. </LI> <LI> 4<I>f</I> <SUP>7</SUP>(<SUP>6</SUP>P<SUB>7/2</SUB>)→4<I>f</I> <SUP>7</SUP>(<SUP>8</SUP>S<SUB>7/2</SUB>) transition of the Eu<SUP>2+</SUP> ions can be observed in this system; </LI> <LI> The Ba<SUB>5</SUB>Al<SUB>3</SUB>F<SUB>19</SUB>:Eu<SUP>2+</SUP> phosphor shows excellent thermal stability at high temperature. </LI> </UL> </P>

A Method for Multiple Identification of Four β2-Agonists in Goat Muscle and Beef Muscle Meats Using LC-MS/MS Based on Deproteinization by Adjusting pH and SPE for Sample Cleanup

Lin Xiong,Ya-Qin Gao,Wei-Hong Li,Tian-Feng Guo,Xiao-Lin Yang 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.5

An LC-MS/MS method was established for simultaneous identification of levels of bilpaterol, cimbuterol, clenproperol, and bambuterol in goat and beef muscle. Meat samples were subjected to extraction using an aqueous acidic solution and cleansed using MCX solid phase extraction. β2-Agonists residues were extracted using an aqueous acidic solution. Proteins in extraction liquids was removed based on adjusting pH using perchloric acid and a sodium hydroxide solution, followed by SPE for clean-up. Linearity values of the method based on R2 values were 0.9976-0.9997 with 70.1-108.8% recovery and relative standard deviation values of 3.5-13.3%. Low limits of detection (LOD) and quantitation (LOQ) of 0.01-0.02 and 0.02-0.08 μg/kg, respectively, were achieved for spiked goat and spiked beef muscle. The method was sensitive and specific and is an improvement over other currently available technologies.

Efficient and thermally stable red luminescence from nano-sized phosphor of Gd6MoO12:Eu3+

Qin, Lin,Wei, Donglei,Huang, Yanlin,Kim, Sun Il,Yu, Young Moon,Seo, Hyo Jin Springer-Verlag 2013 Journal of nanoparticle research Vol.15 No.9

Scutellaria Extract Decreases the Proportion of Side Population Cells in a Myeloma Cell Line by Down-regulating the Expression of ABCG2 Protein

Lin, Mei-Gui,Liu, Li-Ping,Li, Chen-Yin,Zhang, Meng,Chen, Yuling,Qin, Jian,Gu, Yue-Yu,Li, Zhi,Wu, Xin-Lin,Mo, Sui-Lin Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12

Background and Aims: Scutellaria is one of the most popular traditional Chinese herbal remedies against various human diseases, including cancer. In this study, we examined the active effects of Scutellaria extract and its main flavonoid constituents on the proportion of side population cells within human multiple myeloma cell line RPMI8226 in vitro and explored the potential molecular mechanisms involved. Materials and Methods: The contents of flavonoids in ethanolic extract of Scutellaria baicalensis Georgi were determined using high performance liquid chromatography. The antiproliferative effect of the ethanolic extract on RPMI-8226 was determined by CCK assay. Apoptosis was measured by annexin combining with propidium iodide in a flow cytometer. Cell cycle analysis was performed by propidium iodide staining in combination with flow cytometry analysis. Hoechst 33342 exclusion assay was used for the identification of side population within RPMI8226 cells. The expression of ABCG2 protein was assessed by Western blotting assay. Results: The content of major flavonoids constitutents of Scutellaria extract was baicalin (10.2%), wogonoside (2.50%), baicalein (2.29%), and wogonin (0.99%), respectively. The crude Scutellaria extract did not show significant anti-proliferative effect, apoptosis induction and cell cycle arrest in RPMI-8226 within the concentrations of $1-75{\mu}g/mL$. However, the ethanolic extract, baicalein, wogonin and baicalin reduced the side population cells in RPMI-8226, and data showed that baicalein and wogonin had stronger inhibitory effects. Correspondingly, they also exhibited significant effects on decreasing the expression level of ABCG2 protein in RPMI-8226 in vitro. Conclusions: Our results for the first time demonstrated a novel mechanism of action for Scutellaria extract and its main active flavonoids, namely targeting SP cells by modulating the expression of ABCG2 protein. This study provides an insight for new therapeutic strategies targeting cancer stem cells of multiple myeloma.

Preparation, characterization and luminescent properties of red-emitting phosphor: LiLa₂NbO₆ doped with Mn⁴⁺ ions

Qin, Lin,Bi, Shala,Cai, Peiqing,Chen, Cuili,Wang, Jing,Kim, Sun Il,Huang, Yanlin,Seo, Hyo Jin Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.755 No.-

<P><B>Abstract</B></P> <P>Series of Mn<SUP>4+</SUP>-activated LiLa<SUB>2</SUB>NbO<SUB>6</SUB> red emitting phosphors were prepared by the solid state method. The structural and luminescence properties are investigated on the basis of X-ray diffraction (XRD), emission and excitation spectra, and luminescence decay curves. The LiLa<SUB>2</SUB>NbO<SUB>6</SUB>:Mn<SUP>4+</SUP> phosphors can be efficiently excited by near-UV to blue light and exhibit bright red emission at around 712 nm, which can be assigned to the <SUP>2</SUP>E<SUB>g</SUB>→<SUP>4</SUP>A<SUB>2g</SUB> transition of the 3 d<SUP>3</SUP> electrons in [MnO<SUB>6</SUB>] octahedra. Temperature dependent emission spectra and decay curves from 10 to 480 K are analyzed to understand the luminescence mechanism of Mn<SUP>4+</SUP> in LiLa<SUB>2</SUB>NbO<SUB>6</SUB> lattice. Notably, such a novel red emitting phosphor shows special anti-thermal quenching behavior.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We provide a comprehensive study of the luminescence mechanism of the Mn<SUP>4+</SUP> ion. </LI> <LI> Sharp emission lines belong to vibrational modes are observed at low temperature. </LI> <LI> The LiLa<SUB>2</SUB>NbO<SUB>6</SUB>:Mn<SUP>4+</SUP> phosphor shows special anti-thermal stability at low temperature. </LI> </UL> </P>

Flatbands and Emergent Ferromagnetic Ordering in Fe3Sn2 Kagome Lattices

Lin, Zhiyong,Choi, Jin-Ho,Zhang, Qiang,Qin, Wei,Yi, Seho,Wang, Pengdong,Li, Lin,Wang, Yifan,Zhang, Hui,Sun, Zhe,Wei, Laiming,Zhang, Shengbai,Guo, Tengfei,Lu, Qingyou,Cho, Jun-Hyung,Zeng, Changgan,Zhan American Physical Society 2018 Physical Review Letters Vol.121 No.9

Patient and Care Delays of Breast Cancer in China

Yue-Lin Li,Ya-Chao Qin,Lu-Ying Tang,Yu-Huang Liao,Wei Zhang,Xiao-Ming Xie,Qiang Liu,Ying Lin,Ze-Fang Ren 대한암학회 2019 Cancer Research and Treatment Vol.51 No.3

Purpose This study differentiates patient and care delays of breast cancer and explores the related factors as well as the associations with the prognosis in Guangzhou, a southern city of China. Materials and Methods A cohort of female incident breast cancer patients (n=1,551) was recruited from October 2008 to March 2012 and followed up until January 1, 2016 (n=1,374) in the affiliated hospitals of Sun Yat-sen University. The factors associated with patient and care delays were analyzed with multivariable logistic models. Cox proportional hazards regression models were constructed to estimate the impacts of the delays on the prognosis. Results There were 40.4% patient delay (! 3 months) and 15.5% care delay (! 1 month). The patient delay, but not the care delay, was significantly related to the clinical stage and consequently worsened the prognosis of breast cancer (hazard ratio, 1.45; 95% confidence interval, 1.09 to 1.91 for progression-free survival). The factors related to an increased patient delay included premenopausal status, history of benign breast disease, and less physical examination. Conclusion Patient delay was the main type of delay in Guangzhou and resulted in higher clinical stage and poor prognosis of breast cancer. Screening for breast cancer among premenopausal women may be an effective way to reduce this delay.

An Improved Energy Balance Routing Protocol based on LEACH Protocol

Xiang Lin Qin 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.12

LEACH algorithm is a classical hierarchical routing algorithm; it uses the cluster head rotation mechanism to allocate the energy consumption to the whole network. But because of the randomness of the cluster head selection, the optimal number of cluster heads can not be obtained, at the same time, its position cannot do the best, some regions of the cluster head may be more concentrated, some areas may not cluster head, lead to the distance of non-cluster head node and cluster head node is too large, the energy consumption is too large. Soan improved routing algorithm based on LEACH algorithm is proposed, the basic idea is to determine the optimal number of cluster heads, non-uniform clustering, at the same time, the threshold is added in the LEACH algorithm, the nodes with high residual energy become cluster heads, in the process of transmission, multi hop transmission mechanism is adopted among cluster heads. Simulation results show that, this algorithm further reduces the energy consumption in the network, effectively extending the life cycle of the network.

Influence of Preparation Conditions on the Formation of Copper (II) Architectures with Pyrazine-2,3,5-tricarboxylic Acid

Feng-Qin Wang,Shu Lin,Ming-Lin Guo,Jun-Jian Xu,Xiao-Qing Wang,Yong-Nan Zhao 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.7

Three new metal-organic copper(II) complexes, [Cu(H_2PZTC)_2]_n·2nH_2O (1), [Cu(HPZTC)·2H_2O]_n·2nH_2O (2),and Cu_2[(PZHD)(OH)(H_2O)_2]_n (3) (H_3PZTC = pyrazine-2,3,5-tricarboxylic acid, PZHD^3− = 2-hydroxypyrazine-3,5-dicarboxylate), have been synthesized from Cu(II)/H3PZTC system under different synthetic conditions, and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy and thermogravimetric analysis. In complexes 1 and 2, H_3PZTC ligands loose one and two protons, which were transformed into H_2PZTC− anion and HPZTC^2− dianion under different preparation condition, respectively. Furthermore, two ligands coordinate with Cu(II) cations in different modes, leading to the formation of the different chain structures. In complex 3, H_3PZTC ligand was converted into a new ligand-PZHD by in situ decarboxylation and hydroxylation under a higher pH value than that for complexes 1 and 2. PZHD ligands link the Cu(II) cations to form a 2D layer structure. These results demonstrate that the preparation conditions,including pH value and reaction temperature etc, play an important role in the construction of complexes based on H_3PZTC ligand.