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Fjord-Type AIEgens Based on Inherent Through-Space Conjugation

CCS chemistry 2024年第7期6卷 1739-1747页

作者： Ye-Qiang Han Yuan Xie Jianyu zhang Shiyu Tan Haoke zhang Ben Zhong Tang Jonathan l.Sessler Feihe Huang Stoddart Institute of molecular Science Department of ChemistryZhejiang UniversityHangzhou 310058 Zhejiang-Israel Joint laboratory of Self-Assembling Functional Materials ZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou 311215 MOE key laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310058 Center for AIE Research College of Materials Science and EngineeringShenzhen UniversityShenzhen 518061 Department of chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionThe Hong Kong University of Science and TechnologyKowloonHong Kong 999077 School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhen(CUHK-Shenzhen)Guangzhou 518172 Department of chemistry The University of Texas at AustinAustinTexas 78712-1224 Green Catalysis Center and college of chemistry Zhengzhou UniversityZhengzhou 450001

Through-space conjugation(TSC)is a noncovalently electronic interaction that is emerging as a potential complement to through-bond conjugation(TBC)-based strategies for constructing luminescent ***,the design of efficient luminogens based on TSC is currently challenging due to a lack of established structure-property *** is particularly true in the case of luminogens displaying aggregation-induced emission(AIE)*** this work,three terphenyl derivatives were prepared,and their photophysical properties were systemically *** was found that relative to the corresponding m-and p-linked analogues,the electronic interaction of TBC is weakened while the strength of TSC is commensurately enhanced in the constitutional isomer containing an o-linked fjordtype *** this set of luminogens,the presence of a fjord-type arrangement promotes a transformation from aggregation-caused quenching to *** investigations involving congeneric quaterphenyl and pentphenyl isomers support the universality of the fjord-type unit as a framework for synthesizing AIE-active luminogens(AIEgens)with inherent *** work not only provides a novel set of AIEgens but also establishes the utility of TSC in controlling the photophysical properties of nonconventional and twisted luminogens.

关键词： fjord-type through-space conjugation through-bond conjugation aggregation-induced emission luminescence twisted conformation

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CHARACTERIZATION OF REGENERATED CEllUlOSE MEMBRANES HYDROlYZED FROM CEllUlOSE ACETATE

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Chinese Journal of Polymer Science 2002年第4期20卷 369-375页

作者： Yun Chen Xiao-peng Xiong Guang Yang li-na zhang Sen-lin lei Hui liang Electron Microscope lab of Medical School, Wuhan University Wuhan 430072, China college of chemistry and molecular sciences, Wuhan University, Wuhan 430072, China Electron Microscope lab of Medical School Wuhan University Wuhan 430072 college of chemistry and molecular sciences Wuhan University Wuhan 430072

A series of cellulose acetate membranes were prepared by using formamide as additive, and then were hydrolyzed in 4 wt% aqueous NaOH solution for 8 h to obtain regenerated cellulose membranes. The dependence of degree of substitution, structure, porous properties, solubility and thermal stability on hydrolysis time was studied by chemical titration, Fourier transform infrared spectroscopy, scanning electron microscopy, wide-angle X-ray diffraction, and differential scanning calorimetry, respectively. The results indicated that the pore size of the regenerated cellulose membranes was slightly smaller than that of cellulose acetate membrane, while solvent-resistance, crystallinity and thermostability were significantly improved. This work provides a simple way to prepare the porous cellulose membranes, which not only kept the good pore characteristics of cellulose acetate membranes, but also possessed solvent-resistance, high crystallinity and thermostability. Therefore, the application range of cellulose acetate membranes can be expanded.

关键词： hydrolysis cellulose acetate thermal stability regenerated cellulose membrane pore size solvent-resistance SEM

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The Study of Anti-tumor Activity of Trichosanthin by Cyclic Voltammogram

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Chinese Chemical letters 2000年第7期11卷 597-600页

作者： Gang XU Cheng Cai AN Jun FENG Yun Xiang CI Jin Hua TIAN zhang liang CHENI( National laboratory of Protein Engineering and Plant Genetic Engineering, college of life sciences, Peking University, Beijing 100871college of chemistry and molecular Engineeri National laboratory of Protein Engineering and Plant Genetic Engineering College of Life Sciences Peking University college of chemistry and molecular Engineering Peking University

The anti-tumor activity of Trichosanthin (TCS) has been frequently reported in recent years. In our experiments, electrochemical methods were applied to detect the effects of TCS on human leukemia cells U937. 50 mu g/ml TCS treatment for 40 hours can cause irreversible negative effects on the viability of U937 cells. This effect largely depends on the concentration of TCS and the time period of treatment.

关键词： Trichosanthin (TCS) U937 cells cyclic voltammogram Ribosome Inactivating Proteins (RIPs)

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Genetically-and environmentally-dependent processes drive interspecific and intraspecific divergence in the Chinese relict endemic genus Dipteronia

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Plant Diversity 2024年第5期46卷 585-599页

作者： Tao Zhou Xiaodan Chen Jordi lópez-Pujol Guoqing Bai Sonia Herrando-Moraira Neus Nualart Xiao zhang Yuemei Zhao Guifang Zhao key laboratory of Resource Biology and Biotechnology in Western China(Ministry of Education) College of Life SciencesNorthwest UniversityXi'an 710069China School of Pharmacy Xi'an Jiaotong UniversityXi'an 710061China college of life Science Shanxi Normal UniversityTaiyuanChina Botanic Institute of Barcelona(IBB) CSIC-CMCNBBarcelona 08038CataloniaSpain Escuela de Ciencias Ambientales Universidad Espíritu Santo(UEES)Samborondón 091650Ecuador Shaanxi Engineering Research Centre for Conservation and Utilization of Botanical Resources Xi'an Botanical Garden of Shaanxi ProvinceXi'an 710061China School of Biological sciences Guizhou Education UniversityGuiyangChina

China is a hotspot of relict plant species that were once widespread throughout the Northern *** research has demonstrated that the occurrence of long-term stable refugia in the mountainous regions of central and south-western China allowed their persistence through the late Neogene climate *** of these relict lineages is Dipteronia,an oligotypic tree genus with a fossil record extending to the ***,we investigated the genetic variability,demographic dynamics and diversification patterns of the two currently recognized Dipteronia species(Dipteronia sinensis and ***).molecular data were obtained from 45 populations of Dipteronia by genotyping three cpDNA regions,two single copy nuclear genes and 15 simple sequence repeat *** genetic study was combined with niche comparison analyses on the environmental space,ecological niche modeling,and landscape connectivity *** found that the two Dipteronia species have highly diverged both in genetic and ecological *** the incipient speciation processes that can be observed in ***,the occurrence of long-term stable refugia and,particularly,a dispersal corridor along Daba Shan-west Qinling,lik.l. ensured its genetic and ecological integrity to *** study will not only help us to understand how populations of Dipteronia species responded to the tectonic and climatic changes of the Cenozoic,but also provide insight into how Arcto-Tertiary relict plants in East Asia survived,evolved,and diversified.

关键词： Dipteronia Interspecific/intraspecific divergence Genetic structure Climatic niche divergence Dispersal corridor

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long‐life lithium batteries enabled by a pseudo‐oversaturated electrolyte

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Carbon Energy 2024年第4期6卷 115-127页

作者： Youchun Yu Simeng Wang Juyan zhang Weiwei Qian Nana zhang Guangjie Shao Haiyan Bian Yuwen liu lan zhang Hebei key laboratory of Applied chemistry College of Environmental and Chemical EngineeringYanshan UniversityQinhuangdaoChina Beijing key laboratory of Ionic liquids Clean Process CAS Key Laboratory of Green Process and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijingChina Haike Group Research Institute of Innovation&Technology DongyingChina langfang Green Industrial Technology Center LangfangChina

The specific energy of li metal batteries(lMBs)can be improved by using high‐voltage cathode materials;however,achieving long‐term stable cycling performance in the corresponding system is particularly challenging for the liquid ***,a novel pseudo‐oversaturated electrolyte(POSE)is prepared by introducing 1,1,2,2‐tetrafluoroethyl‐2,2,3,3‐tetrafluoropropyl ether(TTE)to adjust the coordination structure between diglyme(G2)and lithium bis(trifluoromethanesulfonyl)imide(liTFSI).Surprisingly,although TTE shows little solubility to liTFSI,the molar ratio between liTFSI and G2 in the POSE can be increased to 1:1,which is much higher than that of the saturation state,1:*** and experimental results prove that TTE promotes closer contact of the G2 molecular with li^(+)in the ***,it also participates in the formation of electrolyte/electrode *** electrolyte shows outstanding compatibility with both the li metal anode and typical high‐voltage ***||li symmetric cells show a long life of more than 2000 h at 1 mA cm^(−2),1 mAh cm^(−2).In the meantime,li||liNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)cell with the POSE shows a high reversible capacity of 134.8 mAh g^(−1 )after 900 cycles at 4.5 V,1 C *** concept of POSE can provide new insight into the li^(+)solvation structure and in the design of advanced electrolytes for lMBs.

关键词： high voltage lithium metal batteries pseudo‐oversaturated electrolyte solid electrolyte interphases(SEI) solvation structure

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O_(2)-generating multifunctional polymeric micelles for highly efficient and selective photodynamic-photothermal therapy in melanoma

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Chinese Chemical letters 2024年第7期35卷 394-399页

作者： Yu Qin Mingyang Huang Chenlu Huang Hannah lPerry linhua zhang Dunwan Zhu Tianjin key laboratory of Biomedical Materials Key Laboratory of Biomaterials and Nanotechnology for Cancer ImmunotherapyInstitute of Biomedical EngineeringChinese Academy of Medical Sciences&Peking Union Medical CollegeTianjin 300192China molecular sciences Research Hub Department of ChemistryWhite City CampusImperial College LondonLondon W120BZUnited Kingdom

Photothermal therapy(PTT)and photodynamic therapy(PDT)have received tremendous attention owing to their great potential for tumor ***,two main issues hamper the antitumor performance of PDT:overexpression of glutathione(GSH)in tumors,which consumes PDT-induced reactive oxygen species(ROS),and hypoxia within the tumor *** drawbacks of PTT include uneven temperature distribution and the upregulation of the heat-shock proteins in tumors,both of which result in ineffective *** address these issues,a MnO_(2)doped nano-delivery system(HTIM-PMs)was synthesized by one-step self-assembly of disulfide bond bridged copolymers for indocyanine green(ICG)and MnO_(2)*** surface of polymeric micelles was layered with hyaluronan(HA)and transactivator(TAT)peptides to improve active targeting and increase cell *** internalization,HTIM-PMs showed responsiveness to the tumor microenvironment(acid pH,high glutathione,high H_(2)O_(2)).Breaking the disulfide bond reduced the intratumoral GSH level and simultaneously released the MnO_(2)and *** released MnO_(2)further reduced the GSH level and promoted O_(2)generation,thus enhancing the PDT *** PTT-mediated hyperthermia accelerated blood flow,which is beneficial for O_(2)distribution,and promotes ROS *** PTT-mediated adjuvant effects further overcame the limitations of PDT and the robust PDT effect in turn compensated for the deficiency of *** promising platform exhibited a significant improvement in the PTT-PDT cancer treatment strategy compared to previously reported nanostructures.

关键词： Photodynamic therapy Photothermal therapy Oxygen generating One-step self-assembly Stimuli-responsive nanoparticles

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Syntheses and properties of associative acrylamide copolymers containing short hydrophobic chains used in a friction reducer for slick-water fracturing

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Petroleum Science 2024年第3期21卷 1889-1901页

作者： Ya-Xing Dai Xian-li zhang Si-Yuan liu Feng-Run-Ze zhang Yi-Xi zhang Yu-Tong Sang Jing-Xi Zheng Zhao-Sheng liu Peng zhang college of chemistry and Chemical Engineering Chongqing University of Science and TechnologyChongqing401331China college of Ecology and Environment Chongqing Resources and Environmental Protection of UniversityChongqing401331China China China Property Project Department of Dezhou Mining Property Service CenterShengli Oilfield Company of SinopecDezhou253000ShandongChina

Two allyldimethylalk.l.quaternary ammonium salt(AQAS)monomers,N,N-dimethylallylphenylpropylammonium bromide(AQAS1)and N,N-dimethylallylnonylammonium bromide(AQAS2),were synthesized and used to prepare modified polyacrylamide *** new drag reducers were synthesized from acrylamide(AM),sodium acrylate(Na AA)and a cationic modified monomer(AQAS1 or AQAS2)via aqueous solution polymerization,and the copolymers were named P(AM/Na AA/AQAS1)and P(AM/Na AA/AQAS2),*** structures of the drag reduction agents were confirmed by IR and1H NMR *** molecular weight(Mw)of P(AM/Na AA/AQAS1)was 1.79×10^(6)g/*** the copolymer concentration was 1000 mg/l and the flow rate was 45 l/min,in fresh water the highest drag reduction rate was 75.8%,in 10,000 mg/l Na Cl solution the drag reduction rate decreased to 72.9%.The molecular weight of P(AM/Na AA/AQAS2)was 3.17×10^(6)g/*** the copolymer concentration was500 mg/l and the flow rate was 45 l/min,the drag reduction rate reached 75.2%,and in 10,000 mg/l Na Cl solution the drag reduction rate was 73.3%,decreased by approximately 1.9%.The drag reduction rate for partially hydrolyzed polyacrylamide(HPAM)was also investigated,and the results showed that the drag reduction rates for 500 and 1000 mg/l HPAM solutions were merely 43.2%and 49.0%in brine,*** with HPAM,both of the above copolymers presented better drag reduction capacities.

关键词： Shale gas Slick water Drag reducer Modified monomer Copolymerization

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High-efficiency Ce-modified ZSM-5 nanosheets for waste plastic upgrading

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Nano Research 2024年第6期17卷 5645-5650页

作者： Xiaomei Wang Xueting Wu Meng Zhao Rui zhang Zijian Wang Yuou li liangliang zhang Xiao Wang Shuyan Song Hongjie zhang State key laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied chemistry and Engineering University of Science and Technology of ChinaHefei 230026China Department of chemistry Tsinghua UniversityBeijing 100084China

Zeolite-based catalyst hydrocracking of plastics is a potential strategy for mitigating the environmental impacts of plastic wastes and recycling valuable resources,but difficult mass transfer,low concentration of acid sites,and high cost are still barriers to their practical *** this paper,we report an excellent hydrocracking catalyst of ZSM-5 nanosheets(Ce/b-ZSM-5)modified by Ce species with high conversion up to 96.3%,C_(3)−C_(5)selectivity up to 80.9%,and good stability during the hydrogenation of low-density *** comprehensive studies,b-ZSM-5 shows higher molecular diffusion efficiency and acid site concentrations compared with normal ZSM-5(n-ZSM-5)and hollow ZSM-5(h-ZSM-5).The introduction of Ce species into b-ZSM-5 further increases the density of Brønsted(B)and lewis(l)acid sites as active sites,which enhances the adsorption of substrates and facilitates the formation of intermediates and desorption of *** a result,the hydrocracking activity of Ce/b-ZSM-5 is significantly improved.

关键词： rare earth zeolite plastic degradation catalytic hydrocracking morphology acidic site

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Phosphorylation Promotes the Accumulation of PERIOD Protein Foci

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Research 2024年第1期2023卷 59-69页

作者： Mengna li Shujing li luoying zhang key laboratory of molecular Biophysics of Ministry of Education College of Life Science and TechnologyHuazhong University of Science and TechnologyWuhanHubei 430074China Department of life sciences Bengbu Medical CollegeBengbuAnhui 233030China Hubei Province key laboratory of Oral and Maxillofacial Development and Regeneration WuhanHubei 430022China

Circadian clock drives the 24-h rhythm in our behavior and *** molecular clock consists of a series of transcriptional/translational feedback.l.ops operated by a number of clock genes.A very recent study reported that the clock protein PERIOD(PER)is organized into discrete foci at the nuclear envelope in fly circadian neurons,which is believed to be important for controlling the subcellular localization of clock *** of inner nuclear membrane protein lamin B receptor(lBR)leads to disruption of these foci,but how they are regulated is yet ***,we found that PER foci are lik.l. phase-separated condensates,the formation of which is mediated by intrinsically disordered region in *** promotes the accumulation of these *** phosphatase 2A,which is known to dephosphorylate PER,hampers the accumulation of the *** the other hand,the circadian kinase DOUBlETIME(DBT)which phosphorylates PER enhances the accumulation of the *** lik.l. facilitates PER foci accumulation by destabilizing the catalytic subunit of protein phosphatase 2A,MICROTUBUlE STAR(MTS).In conclusion,here,we demonstrate a key role for phosphorylation in promoting the accumulation of PER foci,while lBR modulates this process by impinging on the circadian phosphatase MTS.

关键词： conclusion separated translational

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Smart tailoring of molecular catalysts:Mounting approach to oxygen reduction reaction

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Journal of Materials Science & Technology 2024年第1期168卷 169-184页

作者： Anuj kumar Mohd Ubaidullah Guoxin zhang Jasvinder kaur Saira Ajmal Mudassir Hasan krishna kumar Yadav Hafiz M.Adeel Sharif Ram k.Gupta Ghulam Yasin Nano-Technology Research laboratory Department of ChemistryGLA UniversityMathuraUttar Pradesh 281406India Department of chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdaoShandong 266590China Institute for Advanced Study Shenzhen UniversityShenzhenGuangdong 518060China Department of chemistry Kansas Polymer Research CenterPittsburg State UniversityPittsburgKS 66762United States Faculty of Science and Technology Madhyanchal Professional UniversityRatibadBhopal 462044India Environmental and Atmospheric sciences Research Group Scientific Research CenterAl-Ayen UniversityThi-QarNasiriyah 64001Iraq Department of Chemical Engineering king khalid University Saudi Arabia Department of chemistry School of SciencesIFTM UniversityMoradabadUttar Pradesh 244102India Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808China School of Environment and Civil Engineering Dongguan University of TechnologyDongguanGuangdong 523808China

Efficient electrocatalytic rupture of energy-rich molecules(H_(2)and O_(2))is a green approach for gener-ating clean energy for modern *** this context,porphyry-type molecular electrocatalysts act intelligently toward oxygen reduction reaction(ORR),a fundamental process in fuel cells,due to their redox-rich chemistry,which involves core metal ions and macrocyclic *** concerned scientific community has tried many times to correlate the ORR intermediates with their formation kinetics and simplify the associated multi H+/e-stages during the ORR process,constructing several volcano plots be-tween catalytic Tafel data,turnover frequencies,and overpotentials for many *** the fact that many review articles on molecular electrocatalysts for ORR have been published,understanding the strategic implications and molecular catalyst intelligence towards homogenous ORR has been poorly *** review examined the relationships between volcano plots of current *** parameters and the Sabatier principle in order to explain the intelligence of molecular electrocatalysts and approaches for their creation,as well as the difficulties and potential prospects of molecular *** facts distinguish this review from previously published articles and will pique the scien-tific community’s interest in avoiding trial-and-error procedures for catalyst creation while also allowing for more exact evaluations of the molecular catalyst’s performance.

关键词： Electrocatalysis molecular catalysts Oxygen reduction reaction Sabatier principle

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