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Mechanistic Aspects of Monomer, Polymer Formation, and Synthesis of PQ-Alt-Dialkyl-fluorene Conjugated Copolymer

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Chemical Research in Chinese Universities 2008年第1期24卷 110-115页

作者： Muddasir Hanif LU Ping ZHENG Yan li Mao XIE Zeng-qi MA Yu-guang li Di li Jing-hong Key Lab for Supramolecular Structure and Materials of Ministry of Education Jilin University Changchun 130012 P. R. China Department of Chemistry Tsinghua University Beijing 100084 P. R. China

Suzuki coupling reaction is widely used in the construction of conjugated polymers; however, there is still no report describing the mechanism and coupling of 9,10-phenanthrenequinone（PQ） building blocks via Suzuki reaction because PQ is sensitive to bases and light. Herein is reported the efficient Suzuki coupling of PQ with 9,10-dialkylfluorene with Na2CO3 as basic species and high molecular weight PQ-Alt-Dialkyl-Fluorene conjugated copolymer obtained in an yield of 42%. Based on the characterization data and well-accepted literature, we proposed a step-by-step mechanistic explanation for the formation of the PQ containing alternating conjugated copolymer.

关键词： 9,10-Phenanthrenequinone Rearrangement Mechanism Conjugated polymer

SURFACE MODIFICATION OF PVDF POROUS MEMBRANES

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Chinese Journal of Polymer Science 2013年第7期31卷 994-1001页

作者： Jian-hua li Jing Miao Xi-sheng Shao 徐又一 qi-qing Zhang Institute of Biomedical and Pharmaceutical Technology & College of Chemistry and Chemical Engineering Fuzhou University Institute of Polymer Science Key Laboratory of Macromolecule Synthesis and Functionalization(Ministry of Education)Zhejiang University

A novel method for the surface modification of PVDF porous membranes was introduced. Styrene-（N-（4- hydroxyphenyl） maleimide） alternating copolymer SHMI-Br was blended with PVDF to fabricate SHMI-Br/PVDF membranes. The C-Br bond on the SHMI-Br/PVDF membrane was served as initial site of ATRP, and P（PEGMA） brush was grafted on the PVDF membrane. Attenuated total reflectance-Fourier transform infrared spectroscopy （ATR/FTIR） was used to prove the P（PEGMA） brushes were successfully grafted onto the SHMI-Br/PVDF membrane surface. Introduction of P（PEGMA） brushes on the PVDF membrane surface enhanced the hydrophilicity effectively. When the PEGMA degree of grafting was 16.7 wt%, the initial contact angle of PVDF membrane decreased from 98° to 42°. The anti-fouling ability of PVDF membrane was improved significantly after P（PEGMA） brush was ~afted. Taking the PEGMA degree of grafting 16.7 wt% as an example, the flux of protein solution was about 151.21 L/（m h） when the pH value of the BSA solution was 4.9. As the pH value was increased to 7.4, the flux was changed to 180.06 L/（m2 h）. However, the protein solution flux of membrane M3 （PEGMA： 0 wt%） was only 73.84 L/（m2 h） and 113.52 L/（m2 h） at pH 4.9 and 7.4, respectively.

关键词： PVDF membrane SHMI-Br Surface modification Hydrophilicity Anti-fouling ability.

Flexible,anti-damage,and non-contact sensing electronic skin implanted with MWCNT to block public pathogens contact infection

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Nano Research 2022年第3期15卷 2616-2625页

作者： Duan-Chao Wang Hou-yong Yu Lurong Jiang Dongming qi Xinxing Zhang Lumin Chen Wentao Lv Weiqiang Xu Kam Chiu Tam National Engineering Lab for Textile Fiber Materials&Processing Technology College of Textile Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018China College of Information Science and Technology Zhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan University Chengdu 610065China Department of Chemical Engineering Waterloo Institute for NanotechnologyUniversity of Waterloo200 University Avenue WestWaterlooOntario N2L 3G1Canada

If a person comes into contact with pathogens on public facilities,there is a threat of contact(skin/wound)*** urgently,there are also reports about COVID-19 coronavirus contact infection,which once again reminds that contact infection is a very easily overlooked disease exposure ***,we propose an innovative implantation strategy to fabricate a multi-walled carbon nanotube/polyvinyl alcohol(MWCNT/PVA,MCP)interpenetrating interface to achieve flexibility,anti-damage,and non-contact sensing electronic skin(E-skin).Interestingly,the MCP E-skin had a fascinating non-contact sensing function,which can respond to the finger approaching 0−20 mm through the spatial weak *** non-contact sensing can be applied urgently to human–machine interactions in public facilities to block *** scratches of the fruit knife did not damage the MCP E-skin,and can resist chemical corrosion after hydrophobic *** addition,the MCP E-skin was developed to real-time monitor the respiratory and cough for exercise detection and disease ***,the MCP E-skin has great potential for emergency applications in times of infectious disease pandemics.

关键词： prevent contact infection anti-damage sensors non-contact sensing respiratory sensing human–machine interaction

Nonvolatile resistive memory and synaptic learning using hybrid flexible memristor based on combustion synthesized Mn-ZnO

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Journal of Materials Science & Technology 2022年第24期119卷 123-130页

作者： qi Xue Tao Hang Jianghu liang Chun-Chao Chen Yunwen Wu Huiqin ling Ming li State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Memristors have been seen as promising candidates for next-generation nonvolatile memory and neuromorphic ***-processed memristors can offer many advantages,such as low-cost fabrication,large-area uniformity,and high ***,the high annealing temperature of the solution process and unsatisfactory performance are impeding the advancement of flexible *** this work,the combustion method was proposed to fabricate the Mn-ZnO-based memristor without a hightemperature process on the flexible *** device demonstrates stable bipolar resistive switching behavior with ultralow switching voltage(-0.6 V/0.71 V),high on/off ratio(>2×10~3),multilevel storage capability,and uniform resistance distribution(σ/μ=18%/16%).The flexible device with a bend radius of 10 mm shows no obvious performance degeneration compared with the device in the flat ***,tunable repetitively synaptic weight was achieved by the *** plasticity functions,such as excitatory postsynaptic current,paired-pulse facilitation,and learning/forgetting behaviors,have been *** work provides a simple and feasible strategy for fabricating the flexible highperformance memristor,with the expectation to facilitate the development of flexible electronics.

关键词： Memristor Flexible Combustion synthesis Synaptic plasticity Mn-ZnO

Sieving carbons promise practical anodes with extensible low-potential plateaus for sodium batteries

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National Science Review 2022年第8期9卷 118-126页

作者： qi li Xiangsi liu Ying Tao Jianxing Huang Jun Zhang Chunpeng Yang Yibo Zhang Siwei Zhang Yiran Jia qiaowei lin Yuxuan Xiang Jun Cheng Wei Lv Feiyu Kang yong Yang Quan-Hong Yang Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin University Nanoyang Group Joint School of National University of Singapore and Tianjin UniversityInternational Campus of Tianjin University Haihe Laboratory of Sustainable Chemical Transformations State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials and Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen University Shenzhen Key Laboratory for Graphene-Based Materials Engineering Laboratory for Functionalized Carbon MaterialsTsinghua Shenzhen International Graduate SchoolTsinghua University

Non-graphitic carbons are promising anode candidates for sodium-ion batteries, while their variable and complicated microstructure severely limits the rational design of high-energy carbon anodes that could accelerate the commercialization of sodium-ion batteries, as is the case for graphite in lithium-ion ***, we propose sieving carbons, featuring highly tunable nanopores with tightened pore entrances, as high-energy anodes with extensible and reversible low-potential plateaus（lid electrolyte interphase inside the nanopores and enables sodium clustering to produce the plateau. Theoretical and spectroscopic studies also show that creating a larger area of sodiophilic pore surface leads to an almost linearly increased number of sodium clusters, and controlling the pore body diameter guarantees the reversibility of sodium cluster formation,producing a sieving carbon anode with a record-high plateau capacity of 400 mAh g–1. More excitingly, this approach to preparing sieving carbons has the potential to be scalable for modifying different commercial porous carbons.

关键词： sodium-ion batteries sieving carbons low-potential plateau pore entrance diameter pore surface area

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基于冷冻-微波法的污水净化试验研究

中国农村水利水电 2025年第1期 1-7页

作者：吴雷张博栗现文胡亚鲜王瑞琪陈俊英西北农林科技大学水利与建筑工程学院陕西杨凌712100 西北农林科技大学旱区农业水土工程教育部重点实验室陕西杨凌712100 西北农林科技大学水土保持科学与工程学院黄土高原土壤侵蚀与旱地农业国家重点实验室陕西杨凌712100

为探究冷冻-微波法净化污水水质效果,研究设计室内污水冻结成冰,结合微波快速解冻,按T1~T5时间段收集融出水试验。结果表明:(1)17 min的微波解冻可取代传统14.5 h的污水冰解冻。(2)T1+T2的微波处理,去除污水中59.18%和64.57%以上的理化... 详细信息

为探究冷冻-微波法净化污水水质效果,研究设计室内污水冻结成冰,结合微波快速解冻,按T1~T5时间段收集融出水试验。结果表明:(1)17 min的微波解冻可取代传统14.5 h的污水冰解冻。(2)T1+T2的微波处理,去除污水中59.18%和64.57%以上的理化指标含量和离子含量,同时色度、浑浊度、絮状沉淀也显著减少。(3)微波解冻17 min后的水产品中,TDS与总硬度浓度比最大仅0.16,总碱度、HPO_(3)、PO_(4)^(3-)、COD_(Mn)、SiO_(2)、H_2SiO_(3)的浓度在0.20~0.41之间;K^(+)、Na^(+)、Ca^(2+)、Mg^(2+)、Cl^(-)、SO_(4)^(2-)、HCO_(3)^(-)-、NO_(3)^(-)浓度比仅在0.05~0.20之间;As的浓度接近0。(4)主成分分析结果显示,冷冻-微波法净化TDS及总阴离子净化效果最好,主成分综合得分Y分别为4.55和3.65。总体而言,结合冻融过程与微波快速解冻,可快速、高效地实现污水处理。

关键词：微波污水净化冻融浓度比去除率

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Factors influencing oil recovery by surfactant-polymer flooding in conglomerate reservoirs and its quantitative calculation method

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Petroleum Science 2022年第3期19卷 1198-1210页

作者： Feng-qi Tan Chun-Miao Ma Jian-Hua qin Xian-Kun li Wen-Tao liu College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China Key Laboratory Computational Geodynamics Chinese Academy of SciencesBeijing100049China Xinjiang Oilfield Company PetroChinaKaramayXinjiang834000China

This study aims to clarify the factors influencing oil recovery of surfactant-polymer(SP)flooding and to establish a quantitative calculation model of oil recovery during different displacement stages from water flooding to SP *** conglomerate reservoir of the Badaowan Formation in the seventh block of the Karamay Oilfield is selected as the research object to reveal the start-up mechanism of residual oil and determine the controlling factors of oil recovery through SP flooding experiments of natural cores and microetching *** experimental results are used to identify four types of residual oil after water flooding in this conglomerate reservoir with a complex pore structure:oil droplets retained in pore throats by capillary forces,oil cluster trapped at the junction of pores and throats,oil film on the rock surface,isolated oil in dead-ends of flow *** the four types of residual oil identified,the SP solution can enhance oil recovery by enlarging the sweep volume and improving the oil displacement ***,the viscosity-increasing effect of the polymer can effectively reduce the permeability of the displacement liquid phase,change the oil-water mobility ratio,and increase the water ***,the stronger the shear drag force of the SP solution,the more the crude oil in a porous medium is ***,the surfactant can change the rock wettability and reduce the absorption capacity of residual oil by lowering interfacial *** the same time,the emulsification further increases the viscosity of the SP solution,and the residual oil is recovered effectively under the combined effect of the above two *** the four start-up mechanisms of residual oil identified after water flooding,enlarging the sweep volume and improving the oil displacement efficiency are interdependent,but their contribution to enhanced oil recovery are *** SP flooding system primarily enlarges the sweep volume by increasing viscos

关键词： Conglomerate reservoir Water flooding Surfactant-polymer flooding Residual oil type Influencing factor Enhanced oil recovery Computational model

A Cenozoic tectono-sedimentary model of the Tainan Basin, the South China Sea: evidence from a multi-channel seismic profile

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第5期9卷 702-713页

作者： Wei-wei DING Jia-biao li Ming-bi li Xue-lin qiU Yin-xia FANG yong TANG Key Laboratory of Submarine Geoscience State Oceanic Administration Hangzhou 310012 China Second lnstitute of Oceanography State Oceanic Administration Hangzhou 310012 China Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

The Tainan Basin is one of the set of Cenozoic extensional basins along northern margin of the South China Sea that experienced extension and subsequently thermal subsidence. The Tainan Basin is close to the Taiwan Arc-Trench System and straddles a transition zone between oceanic and continental crust. A new regional multi-channel seismic profile （973-01） across the region of NE South China Sea is introduced in this paper. In seismic stratigraphy and structural geology, a model of Cenozoic tectono-sedimentation of the Tainan Basin is established. The results show that three stages can be suggested in Tainan Basin; In Stage A （Oligocene （？）-Lower Miocene） the stratigraphy shows restricted rifting, indicating crustal extension. Terrestrial sedi- ments mostly filled the faulted sags of the North Depression on the continental shelf. Structural highs, including the Central Uplift, blocked material transportation to the South Depression in abyssal basin. In Stage B the Tainan Basin （Middle-Upper Miocene） exhibits a broad subsidence resulting from the post-rifting thermal cooling. The faulted-sags in North Depression had been filled up. Terrestrial materials were transported over the structural highs and deposited directly in the South Depression through sub- marine gullies or canyons. This sedimentation resulted in a crucial change in the slope to a modem shape. In Stage C （Latest Miocene-Recent） a phase change from extension to compression took place due to the orogeny caused by the overthrusting of the Luzon volcanic arc. Many inverse structures, such as thrusts, fault bend folds, and a regional unconformity were formed. Forland basin began developing.

关键词： Southwest Tainan Basin Dual-layered structure Fault bend fold Tectono-sedimentary evolution

Theoretical elucidation of rare earth extraction and separation by diglycolamides from crystal structures and DFT simulations

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Journal of Rare Earths 2021年第7期39卷 858-865,I0004页

作者： Xiujing Peng Jianhui Su Hao li Yu Cui Jin yong Lee Guoxin Sun Institute for Smart Materials&Engineering School of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China Department of Chemistry Sungkyunkwan UniversitySuwon 16419Republic of Korea

Diglycolamides(DGAs) show excellent application prospects for the extraction and separation of rare earth metals from highly radioactive liquid wastes and rare earth *** extraction ability of DGAs for rare earth ions in nitrate or chloride media increases with increasing atomic number of the rare earth *** understand the origin of this phenomenon,three binuclear crystals [Ln(TEDGA)_(3)][Ln(NO_(3))_(6)] of N,N,N’,N’-tetraethyldiglycolamide(TEDGA) with rare earth ions La(Ⅲ),Pr(Ⅲ) and Eu(III) were prepared and characterized *** three complexes belong to the triclinic crystal system,P-1 space *** bond lengths of Ln-O_(amide) are significantly shorter than those of Ln-O_(ether) in the same *** Ln-O_(amide) and Ln-O_(enher) bond lengths gradually decrease with increasing atomic number of the rare earth *** dihedral angle formed by TEDGA and metal ions through the tridentate coordination gradually increases with increasing metal ion atomic number,tending toward the formation of sizeable planar coordination structures for the most massive rare earth *** structures of the compounds formed by the extractant and metal ion were optimized by means of DFT *** find that the interaction between TEDGA and the rare earth ion is dominated by electrostatic interaction by analyzing binding energy,WBIs,Mulliken charge,natural electron configurations,and molecular orbital *** covalent component of the Ln-O bonds of the complexes increases with increasing metal atomic *** observed increase in extraction and separation capacity of diglycolamides for rare earth ions with increasing atomic number might be due to the formation of two fivemember rings by one tridentate *** rare earth ions with large atomic numbers tend to form planar structures with large dihedral angles with DGA ligands.

关键词： Diglycolamide Extraction Separation Rare earth Crystal structures DFT simulations