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In-plane oriented CH_(3)NH_(3)PbI_(3) nanowire suppression of the interface electron transfer to PCBM

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Chinese Physics B 2021年第6期30卷 469-475页

作者： Tao Wang Zhao-hui Yu Hao huang Wei-Guang Kong Wei Dang xiao-hui Zhao Hebei Key Laboratory of Optic-Electronic Information Materials College of Physics Science and TechnologyHebei UniversityBaoding 071002China

One-dimensional nanowire is an important candidate for lead-halide perovskite-based photonic detectors and solar cells. Its surface population, diameter, and growth direction, etc., are critical for device performance. In this research,we carried out a detailed study on electron transfer process at the interface of nanowire CH_(3) NH_(3) PbI_(3)(N-MAPbI_(3))/Phenyl C61 butyric acid methyl-ester synonym(PCBM), as well as the interface of compact CH_(3) NH_(3) PbI_(3)(C-MAPbI_(3))/PCBM by transient absorption spectroscopy. By comparing the carrier recombination dynamics of N-MAPbI_(3), N-MAPbI_(3)/PCBM,C-MAPbI_(3), and C-MAPbI_(3)/PCBM from picosecond(ps) to hundred nanosecond(ns) time scale, it is demonstrated that electron transfer at N-MAPbI_(3)/PCBM interface is less efficient than that at C-MAPbI_(3)/PCBM interface. In addition, electron transfer efficiency at C-MAPbI_(3)/PCBM interface was found to be excitation density-dependent, and it reduces with photo-generation carrier concentration increasing in a range from 1.0 × 1018 cm^(-3)–4.0 × 1018 cm^(-3). Hot electron transfer,which leads to acceleration of electron transfer between the interfaces, was also visualized as carrier concentration increases from 1.0 × 10^(18) cm^(-3)–2.2 × 10^(18) cm^(-3).

关键词： lead-halide perovskite nanowire interface electron transfer transient absorption spectroscopy

Effects of geosorbent and solution properties on sorption and desorption of PAHs

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Acta Geochimica 2021年第2期40卷 212-224页

作者： hui Dong Baohua xiao State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550018China University of Chinese Academy of Sciences Beijing 100049China

Characteristics of phenanthrene and pyrene’s sorption and desorption on two local soils in solutions of simulated groundwater,simulated lung fluid,and simulated saliva were studied with batch equilibrium experiments to understand the fate of PAHs in the karst region of southwestern China and to assess the environmental exposure and the health risk of *** results showed that the sorption and desorption isotherms of phenanthrene and pyrene on two target soils in the three solution systems could be adequately described by the Freundlich model,while the fitted isotherm parameters for the simulated groundwater solution distinguished notably from those for the simulated body fluid *** the sorption experiments,in the simulated groundwater,the n values were 0.722 and 0.672 for phenanthrene and were 0.724 and0.663 for pyrene,respectively,on the yellow soil and the limestone soil;The log KF values were 3.118 and 3.323 for phenanthrene and were 3.648 and 3.846 for pyrene,respectively,on the yellow soil and the limestone *** the simulated body fluids,the n values for phenanthrene and pyrene ranged from 0.622 to 0.836 and from 0.590 to0.865,respectively,and the log KF values of phenanthrene and pyrene ranged from 2.845 to 3.327 and from 3.344 to3.779,*** the desorption experiments,in the simulated groundwater,the n values were 0.662 and 0.744 for phenanthrene and were 0.702 and 0.647 for pyrene,respectively,on the yellow soil and the limestone *** log KF values were 3.666 and 3.686 for phenanthrene and were 4.128 and 4.225 for pyrene,respectively,on the yellow soil and the limestone *** the simulated body fluids,the n values for phenanthrene and pyrene ranged from 0.612 to 0.668 and from 0.631 to 0.819,respectively,and the log KF values of phenanthrene and pyrene ranged from 3.134 to 3.407 and from 3.533 to 3.839,*** limestone soil had relatively higher log KF values but lower KOC values compared to those of the yellow soil,i

关键词： PAHs Sorption–desorption Simulated body fluids Yellow soil Limestone soil

Relationship between Ki-67 and CD44 expression and microvascular formation in gastric stromal tumor tissues

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World Journal of Clinical Cases 2022年第2期10卷 469-476页

作者： Bing Ma xiao-Tian huang Gui-Jun Zou Wen-Yu Hou xiao-hui Du Department of General Surgery The PLA General HospitalBeijing 100853China

BACKGROUND A gastric stromal tumor(GST)is a mesenchymal tumor that occurs in the gastrointestinal tract;its biological characteristics are highly ***,the severity of a GST is often evaluated by factors such as risk classification,tumor size,and mitotic ***,these indicators are not very *** patients classified as low risk are also at risk of metastasis and ***,more accurate and objective clinical biological behavior evaluations are urgently *** To determine the relationship between Ki-67 and CD44 expression in GSTs and microvessel formation and *** Eighty-six GST tissue specimens from our hospital were selected for this *** immunohistochemical staining technique was used to detect Ki-67,CD44,and microvessel density(MVD)in the collected samples to analyze the different risk grades and mitotic *** addition,this approach was used to determine the differences in the expression of Ki-67 and CD44 in GST tissues with varying lesion *** In GSTs with positive expression of the Ki-67 protein,the proportions of patients with medium-to-high risk and more than five mitotic counts were 24.07%and 38.89%,*** GSTs with positive expression of the CD44 protein,the proportions of patients with medium-to-high risk and more than five mitotic counts were 23.73%and 38.98%,*** GSTs with negative expression of the Ki-67 protein,these values were relatively high(3.70%and 11.11%,respectively).The MVD in GSTs with positive and negative expression of the CD44 protein was 15.92±2.94 and 13.86±2.98/Hp,respectively;the difference between the two groups was significant(P<0.05).CONCLUSION Ki-67 and CD44 expression in GSTs is correlated with the grade of tumor risk and mitotic ***44 expression is correlated with microvessel formation in tumor tissues.

关键词： Gastric stromal tumor Ki-67 CD44 Expression Microvascular formation Formation of microvessels

Endoscopic submucosal dissection vs endoscopic mucosal resection for superficial esophageal cancer

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World Journal of Gastroenterology 2014年第18期20卷 5540-5547页

作者： hui-Min Guo xiao-Qi Zhang Min Chen Shu-Ling huang xiao-Ping Zou Department of Gastroenterology the Affiliated Drum Tower Hospital of Nanjing University Medical School

AIM: To investigate the effectiveness of endoscopic submucosal dissection (ESD) and endoscopic mucosal resection (EMR) in treating superficial esophageal cancer (SEC).

关键词： Superficial esophageal cancer Endoscopic mucosal resection Endoscopic submucosal dissection Meta-analysis

Prediction of suitable water content in granulation of sintering mixture based on Litster's model

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Journal of Iron and Steel Research International 2024年第3期31卷 552-560页

作者： Fang-lei Dai xiao-hui Fan xiao-xian huang Xu-ling Chen Min Gan Zhi-yun Ji Zeng-qing Sun School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina

Suitable water content plays a decisive role in the granulation of sintering ***,a method was proposed to predict the suitable water content for effective granulation on the basis of Litster's granulation *** granulation effectiveness of a sintering mixture was predicted by the model,with the allowance error of±10%.The effects of the water absorption properties,particle size composition and content of adhesive particles on the suitable water content were *** results showed that the allowable error of prediction was within±0.5%compared to the experimentally determined suitable water *** an increase in adhesive powder content of mixtures with higher water absorption,the suitable water content increased to achieve similar granulation ***,as the amount of concentrates increased,the suitable water content first increased and then remained *** influence of the water absorption characteristics of the adhesive particles on the suitable water content was less than that of their particle size composition in the mixture.

关键词： Adhesive particle Sintering mixture Granulation effectiveness Suitable water content

Greatly Enhanced Hydrolytic Degradation Ability of Poly(L-lactide) Achieved by Adding Poly(ethylene glycol)

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Chinese Journal of Polymer Science 2017年第3期35卷 386-399页

作者： yang-peng wang xiao wei jin duan jing-hui yang nan zhang ting huang 王勇 School of Materials Science and Engineering Southwest Jiaotong University Key Laboratory of Advanced Technologies of Materials Ministry of Education of China Chengdu 610031 China

Plasticized poly(L-lactide)(PLLA) materials have been applied in many fields and the microstructure performance of such materials attracts much attention of researchers. However, few reports declared the hydrolytic degradation ability of the plasticized PLLA materials. In this article, a small quantity of poly(ethylene glycol)(PEG) was introduced into PLLA, which aimed to understand the hydrolytic degradation behavior of the plasticized PLLA materials. The microstructures of the plasticized samples were comparatively investigated using scanning electron microscopy(SEM), wide angle X-ray diffraction(WAXD), differential scanning calorimetry(DSC) and Flourier transform infrared spectroscopy(FTIR), etc. The results demonstrated that PEG improved the hydrophilicity of sample surface, and the relatively high content of PEG enhanced the crystallization ability of PLLA matrix. The hydrolytic degradation measurement was carried out at 60 ℃ in an alkaline solution of pH = 12. The results demonstrated that the plasticized PLLA samples exhibited accelerated hydrolytic degradation compared with the pure PLLA sample, and the hydrolytic degradation was also dependent on the PEG content. Further results demonstrated that PEG induced the change of hydrolytic degradation mechanism possibly due to the good dissolution ability of PEG in water, which provided more paths for the penetration of water. Furthermore, the microstructure evolution of the plasticized PLLA during the hydrolytic degradation process was also investigated, and the results demonstrated the occurrence of PLLA crystallization, which was possibly contributed to the decreased hydrolytic degradation rate observed at relatively long hydrolytic degradation time. This work is of great significance and may open a new way for promoting the reclamation of PLLA waste material.

关键词： PLLA/PEG Microstructure Hydrolytic degradation

The ROCK pathway inhibitor Y-27632 mitigates hypoxia and oxidative stress-induced injury to retinal Müller cells

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Neural Regeneration Research 2018年第3期13卷 549-555页

作者： xiao-hui Zhang Zhao-hui Feng xiao-yu Wang Department of Ophthalmology Second Affiliated Hospital of Xi'an Jiaotong University Medical College Xi'an Shaanxi Province China

Rho kinase （ROCK） was the first downstream Rho effector found to mediate RhoA-induced actin cytoskeletal changes through effects on myosin light chain phosphorylation. There is abundant evidence that the ROCK pathway participates in the pathogenesis of retinal endothelial injury and proliferative epiretinal membrane traction. In this study, we investigated the effect of the ROCK pathway inhibitor Y-27632 on retinal Müller cells subjected to hypoxia or oxidative stress. Müller cells were subjected to hypoxia or oxidative stress by exposure to CoCl2 or H2O2. After a 24-hour treatment with Y-27632, the 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyl tetrazolium bromide assay was used to assess the survival of Müller cells. Hoechst 33258 was used to detect apoptosis, while 2′,7′-dichlorodihydrofluorescein diacetate was used to measure reactive oxygen species generation. A transwell chamber system was used to examine the migration ability of Müller cells. Western blot assay was used to detect the expression levels of α-smooth muscle actin, glutamine synthetase and vimentin. After treatment with Y-27632, Müller cells subjected to hypoxia or oxidative stress exhibited a morphology similar to control cells. Y-27632 reduced apoptosis, α-smooth muscle actin expression and reactive oxygen species generation under oxidative stress, and it reduced cell migration under hypoxia. Y-27632 also upregulated glutamine synthetase expression under hypoxia but did not impact vimentin expression. These findings suggest that Y-27632 protects Müller cells against cellular injury caused by oxidative stress and hypoxia by inhibiting the ROCK pathway.

关键词： nerve regeneration diabetic retinopathy Rho kinases Müller cells reactive oxygen species glutamine synthetase α-smooth muscle actin CoCl2 H2O2 hypoxia oxidative stress neural regeneration

Emission characteristics and control technology of heavy metals during collaborative treatment of municipal solid waste incineration fly ash in iron ore sintering process

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Journal of Iron and Steel Research International 2024年第11期31卷 2655-2663页

作者： xiao-hui Fan Zhi-an Zhou Bin-bin huang Zhi-yun Ji Min Gan Zeng-qing Sun Xu-ling Chen xiao-xian huang Guo-jing Wang School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina Hubei Provincial Key Laboratory of Regional Development and Environmental Response Department of Environmental EngineeringHubei UniversityWuhan430062HubeiChina

The municipal solid waste incineration fly ash (MSWI-FA) contains a large amount of heavy metals, and the process of iron ore sintering and treating fly ash needs to pay attention to the migration characteristics of heavy metals. The impact of the application of MSWI-FA in the sintering process on the emission law of heavy metals in the collaborative treatment process was studied, and corresponding control technologies were proposed. The results showed that the direct addition of water washing fly ash (WM-FA) powder resulted in varying degrees of increase in heavy metal elements in the sinter. As the amount of WM-FA added increases, the content of heavy metal elements correspondingly increases, and an appropriate amount of WM-FA added is 0.5%–1.0%. The migration mechanism of heavy metals during the sintering treatment of WM-FA was clarified. Heavy metals are mainly removed through direct and indirect chlorination reactions, and Cu and Cr can react with SiO_(2) and Fe_(2)O_(3) in the sintered material to solidify in the sinter. Corresponding control techniques have been proposed to reduce the heavy metal elements in WM-FA through the pre-treatment of WM-FA. When the WM-FA was fed in the middle and lower layers of the sintered material, the high temperature of the lower layer was utilized to promote the removal of heavy metals. The Ni element content has decreased from 130 to 90 mg kg^(−1), and the Cd removal rate has increased by 23%. The removal rates of Cd and Cr elements increase by 2.4 and 5.5 times, respectively. There is no significant change in sintering indexes.

关键词： Control technique Emission characteristics Heavy metal Iron ore sintering Municipal solid waste incineration fly ash

Facile preparation of covalent organic frameworks@alginate composite beads for enhanced uranium(Ⅵ) adsorption

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Rare Metals 2022年第4期41卷 1323-1331页

作者： Pan Duan Duo-Yu Lin Wei-Ting Yang xiao-Jing huang A-hui Sun Qin-He Pan Key Laboratory of Advanced Materials of Tropical Island Resources Ministry of EducationChemical Engineering and TechnologyHainan UniversityHaikou 570228China

Covalent organic frameworks(COFs) have broad application prospects in adsorption and ***,as COFs are generally in powder form,their superior performance at the laboratory scale is difficult to transfer into pilot-or industrial-scale ***,there is a strong and urgent need to structure COFs into monolithic ***,a facile strategy was developed to prepare COFs@alginate composite *** composite beads comprising different COFs including TpPa-1(2,4,6-triformylphloroglucinol(Tp) and p-phenylenediamine(Pa-1)as monomers),TpDb(Tp and 2,5-diaminobenzonitrile(Db)as monomers) and TpTt(Tp and 1,3,5-triazine-2,4,6-triamine(Tt) as monomers) with controlled COF loading and product size have been facilely achieved via this strategy,validating the applicability of this ***,the representative TpDb@alginate composite beads showed good adsorption performance of uranium(VI) in aqueous solution with high adsorption capacity(635 mg·g^(-1)),good interference immunity and *** work offers a practical approach for incorporation of COFs into polymer matrix,which can serve as potential adsorbents for radioactive wastewater treatment.

关键词： Covalent organic frameworks Alginate Composite beads Uranium Adsorption