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An electron-transfer[Fe_(2)Co_(2)]square complex exhibiting unprecedented wide room-temperature hysteresis

Science china chemistry 2024年第4期67卷 1198-1207页

作者： Xin-Hua Zhao Yi-Fei Deng Jia-Tao chen Jiong yang Yuan-Zhu Zhang Department of chemistry Southern University of Science and Technology(SUSTech)Shenzhen 518055China

Switchable molecules with magnetic bistability that can function at standard conditions are highly desirable from the perspective of practical *** the last decade,significant progress has been made in modulating thermally induced electrontransfer-coupled spin transition(ETCST)events between diamagnetic{Fe_(LS)^(Ⅱ)(μ-CN)Co_(LS)^(Ⅲ)}and paramagnetic{Fe_(LS)^(Ⅲ)(μ-CN)-Co_(HS)^(Ⅱ)}electron configurations(named LS and HS,respectively,for short)within the Fe/Co mixed-valence cyanometallate ***,we prepared a novel[Fe_(2)Co_(2)]square complex[(pzTp)Fe(CN)_(3)Co(bnbpen)]_(2)[NO_(3)]_(2)·4ch_(3)OH·2.5H_(2)O(1·Solv)and its desolvated phase[(pzTp)Fe(CN)_(3)Co(bnbpen)]_(2)[NO_(3)]_(2)(1),obtained via single-crystal-to-single-crystal(SCSC)*** 1·Solv remaining in the diamagnetic state below room temperature exhibits an irreversible ETCST behavior accompanied by desolvation upon ***,complex 1 displays an unprecedented rate-dependent ETCST behaviour involving with two diamagnetic LS states(a dynamically favoured LS1 state and a thermodynamically favoured LS2state),between which a net one-way transition from LS1 to LS2 is accessible likely via a structural phase transition(SPT)above255 ***,two well separated transition channels(HS?LS1 at around 255 K and HS←→LS2 in the temperature range of 317-350 K)are achieved according to either fast(>20 K/min)or slow rate(<1 K/min),*** a moderate rate of 3 K/min,complex 1 shows a wide hysteresis of 66 K centered at 328 K,the largest yet reported for discrete Fe/Co cyanometallate *** 1 represents the first ETCST example coupled with dynamic SPT,providing a new strategy for manipulating bistability within this fascinating cyanometallate family.

关键词： switchable molecules cyanometallate complexes electron transfer hysteresis structural phase transition

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Molecular-scale co-assembly membranes derived from keplerate cluster:carbonic anhydrase-mimicking nanocapsules for enhanced CO_(2)/N_(2)separation

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Science china chemistry 2024年第10期67卷 3271-3282页

作者： Wan-Lei Zhao Hongqiang Li Ruoxuan Zheng Yixin yang Wei chen Yu-Fei Song State Key Laboratory of chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Quzhou Institute for Innovation in Resource chemical Engineering Quzhou 324000China

The development of CO_(2)separation membranes with high permeability and high selectivity,as well as ultra-thin selective layers,has always been ***,a molecular-scaled co-assembly strategy is employed to fabricate the Pebax-Mo_(132)(Pebax=polyether-block-amide copolymer;Mo_(132)=(NH_(4))_(42)[Mo_(72)^(Ⅵ)Mo_(60)^(Ⅴ)O_(372)(ch_(3)COO)_(30)(H_(2)O)_(72)])*** optimal selfstanding membrane,Pebax-Mo_(132)-5%,shows a CO_(2)permeability of~384 Barrer and an ultra-high ideal CO_(2)/N_(2)selectivity of~244,outperforming most membranes reported in the *** CO_(2)permeability and ideal CO_(2)/N_(2)selectivity are increased by 70%and 367%,respectively,compared with the pristine Pebax membrane.A thin-film composite membrane prepared by spin-coating technique on a support membrane with gutter layers also exhibits a CO_(2)permeance of 838 GPU and a CO_(2)/N_(2)selectivity of *** excellent performance can be attributed to the following reasons:(1)strong hydrogen bonding interactions between{Mo_(132)}clusters and Pebax confer excellent interfacial compatibility to the mixed matrix membranes;(2)incorporation of hollow{Mo_(132)}clusters into the Pebax molecular chain decreases the crystallinity of Pebax,and thereby accelerates the chain dynamics and increases the free volume of the membrane;(3)in situ diffuse reflectance infrared Fouriertransform spectroscopy demonstrates that the{Mo_(132)}clusters can effectively catalyze the hydration reaction of CO_(2)and promote the transport of CO_(2);(4)furthermore,the 0.35 nm pores of the crown ether-type{Mo_(9)O_(9)}allow the accurate size sieving of CO_(2)(0.33 nm)and N_(2)(0.36 nm)molecules.

关键词： polyoxometalates molecular-scale assembly CO_(2)capture mixed matrix membranes

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骨唾液酸蛋白在体外培养人骨髓间充质干细胞向成骨细胞分化中的角色

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中国组织工程研究与临床康复 2007年第37期11卷 7325-7328页

作者：夏冰王捷郭立达詹纯列肖育华杨传红解放军广州军区广州总医院医学实验科广东省广州市510010

目的:骨唾液酸蛋白在骨矿化形成方面扮演重要角色,实验观察其是否能诱导体外培养的人骨髓间充质干细胞向成骨细胞分化。方法:实验于2005-10/2006-12在解放军广州军区广州总医院医学实验科完成。①材料来源:选取在本院体检的健康志愿者2... 详细信息

目的:骨唾液酸蛋白在骨矿化形成方面扮演重要角色,实验观察其是否能诱导体外培养的人骨髓间充质干细胞向成骨细胞分化。方法:实验于2005-10/2006-12在解放军广州军区广州总医院医学实验科完成。①材料来源:选取在本院体检的健康志愿者2人,对本实验均知情同意。采用Ni-NTA亲和纯化技术,从本室构建的毕赤酵母GS115/pPICZaA-hbsp发酵上清中纯化重组人骨唾液酸蛋白。②实验方法:对健康志愿者进行髂骨穿刺抽取骨髓液,采用贴壁法培养得到骨髓间充质干细胞。设立4组:骨唾液酸蛋白组添加0.1nmol/L骨唾液酸蛋白;成骨诱导液组添加10nmol/L地塞米松、10mmol/L磷酸甘油、50mg/L抗坏血酸;联合组添加上述两组的所有试剂;空白对照组不添加任何处理因素;各组均处理细胞12d。③实验评估:光镜及电镜观察培养的细胞形态;以细胞计数法测定生长曲线,应用流式细胞仪分析细胞周期,采用免疫荧光细胞化学法和流式细胞分析检测干细胞标志物STRO-1的表达;生化试剂盒测定碱性磷酸酶活性;von Kossa染色法检测钙沉积。结果:①单个骨髓间充质干细胞为长梭形,经骨唾液酸蛋白处理后细胞大而扁平,原来密集的克隆分散开。②与空白对照组比较,骨唾液酸蛋白组引起细胞生长曲线右移,细胞G0/G1期比例平均增加12.09%(P<0.01),S期比例减少65.92%(P<0.01),STRO-1阳性细胞百分率下降26.54%(P<0.01)。③与空白对照组比较,骨唾液酸蛋白组细胞碱性磷酸酶活性增加50.0%,成骨诱导液组增加59.5%,联合组增加71.43%,并且随着处理时间的延长,活性增加越显著。④空白对照组细胞von Kossa染色呈阴性,其余各组均呈阳性。其中联合组的黑色矿化结节体积最大、数目最多;骨唾液酸蛋白组的结节体积较小、数目较少;成骨诱导液组居中。结论:骨唾液酸蛋白对人骨髓间充质干细胞有促进成骨分化和矿化作用,且与成骨诱导液联用效果更佳。

关键词：骨唾液酸蛋白骨髓间充质干细胞细胞培养

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Investigating the effect of volatility on the hygroscopicities of acetate nanoparticle aerosols by surface plasmon resonance microscopy

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Journal of Environmental Sciences 2024年第4期138卷 167-178页

作者： Bo yang Zhibo Xie Jianguo Liu Huaqiao Gui Jiaoshi Zhang Xiuli Wei Zetao Fan Douguo Zhang Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of china Hefei 230026China CAS Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Advanced Laser Technology Laboratory of Anhui Province Department of Optics and Optical EngineeringUniversity of Science and Technology of ChinaHefei 230026China

Under high relative humidity(RH)conditions,the release of volatile components(such as acetate)has a significant impact on the aerosol *** this work,one surface plasmon resonance microscopy(SPRM)measurement system was introduced to determine the hygroscopic growth factors(GFs)of three acetate aerosols separately or mixed with glucose at different *** Ca(ch_(3)COO)_(2) or Mg(ch_(3)COO)_(2) aerosols,the hygroscopic growth trend of each time was lower than that of the previous time in three cyclic humidification from 70% RH to 90% RH,which may be due to the volatility of acetic acid leading to the formation of insoluble hydroxide(Ca(OH)_(2) or Mg(OH)_(2))under high RH *** the third calculated GF(using the Zdanovskii-Stokes-Robinson method)for Ca(ch_(3)COO)_(2) or Mg(ch_(3)COO)_(2) in bicomponent aerosols with 1:1 mass ratio were 3.20% or 5.33% lower than that of the first calculated GF at 90% *** calculated results also showed that the hygroscopicity change of bicomponent aerosol was negatively correlated with glucose content,especially when the mass ratio of Mg(ch_(3)COO)_(2) to glucose was 1:2,the GF at 90% RH only decreased by4.67% after three cyclic *** coupled plasma atomic emission spectrum(ICP-AES)based measurements also indicated that the changes of Mg^(2+)concentration in bicomponent was lower than that of the *** results of this study reveal thatduring the efflorescence transitions of atmospheric nanoparticles,the organic acids diffusion rate may be inhibited by the coating effect of neutral organic components,and the particles aging cycle will be prolonged.

关键词： Hygroscopic growth Volatility Acetate aerosols Nanoparticle aerosol Surface plasmon resonance

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Facile surface regulation for highly efficient and thermally stable perovskite solar cells via chlormequat chloride

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chinese chemical Letters 2024年第10期35卷 517-523页

作者： Bo yang Pu-An Lin Tingwei Zhou Xiaojia Zheng Bing Cai Wen-Hua Zhang Institute of chemical Materials China Academy of Engineering PhysicsMianyang 621900China School of Physical Science and Technology Southwest UniversityChongqing 400715China Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies School of Materials and EnergyYunnan UniversityKunming 650000China

Defects at the surface and grain boundaries of the perovskite films are extremely detrimental to both the efficiency and stability of perovskite solar cells(PSCs).Herein,a simple and stable quaternary ammonium halide,named chlormequat chloride(i.e.,chlorinated choline chloride,CCC),is introduced to regulate the upper surface chemical environment of perovskite *** anion(Cl^(-))and cation[Clch_(2)ch_(2)N(ch_(3))_(3)]+in CCC could effectively self-search and passivate positively and negatively charged ionic defects in per ovskites,respectively,which contributes to inhibited nonradiative recombination and reduced energy los in *** a result,the champion power conversion efficiency(PCE)of PSCs can be significantly enhanced from 22.82%to 24.07%.Moreover,the unencapsulated device with CCC modification retains 92.0%of it original PCE even subject to thermal aging at 85℃ for 2496 *** work provides guidance for the ratio nal design of functional molecules as defect passivators in PSCs,which is beneficial for the improvement in both device performance and stability.

关键词： Perovskite solarcells Quaternary ammonium halide chlormequat chloride Surface modulation Thermal stability

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Nickel-modified In_(2)O_(3) with inherent oxygen vacancies for CO_(2) hydrogenation to methanol

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Science china chemistry 2024年第5期67卷 1715-1728页

作者： Zixuan Zhou Yuchen Wang Yuanjie Bao Haiyan yang Jiong Li chunran chang Shenggang Li Peng Gao CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China University of chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization School of Chemistry and Chemical EngineeringYulin UniversityYulin 719000China

Methanol synthesis is one of the most important industrially-viable approaches for carbon dioxide(CO_(2)) utilization, as the produced methanol can be used as a platform chemical for manufacturing green fuels and chemicals. The In_(2)O_(3) catalysts are ideal for sustainable methanol synthesis and have received considerable attention. Herein, Co-, Ni-and Cu-modified In_(2)O_(3) catalysts were fabricated with high dispersion and high stability to improve the hydrogenation performance. The Ni-promoted In_(2)O_(3) catalyst in the form of high dispersion possessed the largest amount of oxygen vacancies and the strongest ability for H_(2) activation, leading to the highest CO_(2) conversion and space time yield of methanol of 0.390 g_(Me OH)g_(cat)^(-1)h^(-1) with ch_(3)OH selectivity of 68.7%. In addition, the catalyst exhibits very stable performance over 120 h on stream, which suggests the promising prospect for industrial applications. Further experimental and theoretical studies demonstrate that surface Ni doping promotes the formation of oxygen defects on the In_(2)O_(3) catalyst, although it also results in lower methanol selectivity. Surprisingly, subsurface Ni dopants are found to be more beneficial for methanol formation than surface Ni dopants, so the Nipromoted In_(2)O_(3)catalyst with a lower surface Ni content at the similar Ni loading can reach higher methanol selectivity and productivity. This work thus provides theoretical guidance for significantly improving the CO_(2) reactivity of In_(2)O_(3)-based catalysts while maintaining high methanol selectivity.

关键词： carbon dioxide hydrogenation methanol synthesis indium oxides Ni doping sites transition metal promoters

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女性内生殖器的动脉

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解剖学报 1960年第1期 116-124页

作者：杨春林王云祥哈尔滨医科大学解剖学教研组

关于女性内生殖器子宫、卵巢及输卵管的血液供给问题,过去许多学者,如Fredet(1899)[1]、***(1909)[2]、齐藤(1925)[3]及西贞(1942)[4]等氏,曾做了不少研究,但多是集中于成人的材料。女性内生殖器的动脉,和整个女性内生殖器一样,是随着... 详细信息

关于女性内生殖器子宫、卵巢及输卵管的血液供给问题,过去许多学者,如Fredet(1899)[1]、***(1909)[2]、齐藤(1925)[3]及西贞(1942)[4]等氏,曾做了不少研究,但多是集中于成人的材料。女性内生殖器的动脉,和整个女性内生殖器一样,是随着年龄及生理状态不同而变化最大的一套血管装置.

关键词：卵巢动脉吻合支分支血液解剖学子宫动脉输卵管支子宫底部卵巢支女性

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Two-dimensional atomically thin Pt layers on MXenes: The role of electronic effects during catalytic dehydrogenation of ethane and propane

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Nano Research 2024年第3期17卷 1251-1258页

作者： Zhe Li Tobias K.Misicko Fan yang Xiaopeng Liu Zhenwei Wu Xiaoyang Gao Tao Ma Jeffrey T.Miller Daniela S.Mainardi Collin D.Wick Zhenhua Zeng yang Xiao Yue Wu Department of chemical and Biological Engineering Iowa State University618 Bissell RoadAmesIA 50011USA Institute for Micromanufacturing Louisiana Tech University505 Tech DriveRustonLA 71272USA Davidson School of chemical Engineering Purdue University480 Stadium Mall DriveWest LafayetteIN 47907USA Michigan Center for Materials characterization University of Michigan2800 Plymouth RdAnn Arbor MI 48109USA College of Engineering and Science Louisiana Tech UniversityRustonLA 71272USA

Atomically thin Pt nanolayers were synthesized on the surface of Mo2TiC2 MXenes and used for the catalytic dehydrogenation of ethane and propane into ethylene and propylene,two important chemicals for the petrochemical *** compared with Pt nanoparticles,the atomically thin Pt nanolayer catalyst showed superior coke-resistance(no deactivation for 24 h),high activity(turnover frequencies(TOFs)of 0.4–1.2 s^(-1)),and selectivity(>95%)toward ethylene and *** unique Pt nanolayer has a similar geometric surface to Pt nanoparticles,enabling the investigations of the electronic effect on the catalytic performance,where the geometric effect is *** is found that the electronic effect plays a critical role in dehydrogenative product selectivity and catalyst *** metal–support interaction is found dependent on the substrate and metal components,providing wide opportunities to explore high-performance MXene-supported metallic catalysts.

关键词： MXene catalysis alkane dehydrogenation nanolayers

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Investigating the Absorption and Desorption Behavior of Methylene chloride in the Poly(aryl ether ketone) Film with Different Crystallinities

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chinese Journal of Polymer Science 2024年第2期42卷 239-246,I0009页

作者： Hong-Ru yang Jin-Dong Zhang Dong-Ting Gao Gang Liu chun-Hai chen Jia-Nan Yao Center for Advanced Low-Dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai201620China

Poly(aryl ether keton e)(PAEK) films with different crystallinities were obtained by controlling the cooling rate,which were subjected to the absorption and desorption of methylene chloride(ch_(2)Cl_(2)).We employed attenuated total reflection Fourier transform infrared(ATR-FTIR)spectroscopy analyses to investigate the diffusion behavior of ch_(2)Cl_(2) in PAEK films with different *** to the Fickian diffusion model,the calculated diffu sion coefficients of ch_(2)Cl_(2) in PAEK films were observed to decrease with increasing *** effect of ch_(2)Cl_(2)absorption and desorption on the mechanical properties of PAEK films with different crystallinity was further analyzed using tensile *** tensile tests exhibited that ch_(2)Cl_(2) has two concurrent effects:plasticization and solvent-induced *** scanning calorimetry(DSC) and wide-angle X-ray diffraction(WXRD) techniques further confirmed solvent-induced crystallization *** results would be beneficial to understand the solvent resistance of PAEK materials and consequently provide the practical application conditions of PAEK with a theoretical basis.

关键词： Poly(aryl ether ketone) Diffusion behavior Infrared spectra Solvent-induced crystallization Mechanical properties

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Jianqu,a traditional chinese medicine,alleviates functional dyspepsia in high-calorie and high-protein diet mice

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Traditional Medicine Research 2024年第6期9卷 42-54页

作者： Jing-Yan yang Xiao-Xing Li Juan chen Yan-Jun Liu Yue-Hong Wu Ning-Yu Luo Cai-Xia yang yang Li Si-Jing Liu Jin-Lin Guo College of Medical Technology Chengdu University of Traditional Chinese MedicineChengdu 611137China chongqing Key Laboratory of Sichuan-chongqing Co-construction for Diagnosis and Treatment of Infectious Diseases Integrated Traditional chinese and Western Medicine Chengdu 611137China Key Laboratory of characteristic chinese Medicine Resources in Southwest china College of PharmacyChengdu University of Traditional Chinese MedicineChengdu 611137China

Background:Jianqu has been used to alleviate symptoms in patients with functional dyspepsia,but its specific anti-functional dyspepsia effect is still ***,our study aimed to investigate the impact of Jianqu on functional dyspepsia in ***:The phytochemical profile of Jianqu was analyzed by ***,Kunming mice were fed a high-calorie or high-protein diet(HchP)for 7 days,and then orally treated with vehicle or Jianqu(1.62 g/kg body weight(b.w.)and 3.25 g/kg b.w.)for 10 days.A carbon powder solution was used to detect the gastric emptying and intestinal transit *** pathological changes in stomach and duodenum were evaluated by hematoxylin-eosin *** occludin,claudin-1,ZO-1 and CD45 expression was measured by immunocytochemical ***,the serum gastrointestinal hormones were detected by *** addition,the gut microbiota composition was determined using 16S rRNA gene *** cecal short chain fatty acids were assessed by gas ***:In general,17 phytochemical compounds were identified from Jianqu,which significantly improved the gastric emptying rate and intestinal transit rate(pchP mice as *** HchP did not cause significant pathological lesions in the gastrointestinal tract,increased the expression of CD45 in the duodenum(pchain fatty acids levels in cecum(pchP mice possibly through reducing the duodenal leukocyte infiltration,and regulating the expression of gastrointestinal *** effects may be partly related to the increasing cecal short ch

关键词： herbal formula dyspepsia gastrointestinal hormones gastric emptying intestinal transit

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