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Thermal Expansion Behavior of Poly(amide-imide)Films with Ultrahigh Tensile Strength and Ultralow CTE

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Chinese Journal of Polymer Science 2020年第7期38卷 748-758,I0007页

作者： Lan Bai Lei Zhai Min-Hui He Chang-Ou Wang Song Mo Lin fan Laboratory of Advanced Polymer Materials Institute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemistry and Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

A series of novel poly(amide-imide)(PAl)films with different amide contents were prepared from pyromellitic dianhydride and four amide-containing *** PAl films exhibited excellent mechanical and thermal properties with tensile strength of 203.7-297.4 MPa and Tg above 407℃.The rigid backbone structures combined with strong intermolecular interactions provided PAl films with ultralow in-plane CTE values from-4.17 ppm/℃to-0.39 ppm/℃in the temperature range of 30-300℃.The correlation between thermal expansion behavior and aggregation structures of PAl film was *** results suggested that hydrogen bonding interactions could be maintained even at high temperature,thus resulting in good dimension reversibility of films in multiple heating-cooling *** is demonstrated that dimensional stabilities of PAl films are determined by the rigidity,orientation,and packing of molecular ***-resistant PAl films with ultralow CTE can be developed as flexible substrates by regulating backbones and aggregation structures for optoelectronic application.

关键词： Poly(amide-imide)s Thermal expansion behavior Aggregation structures

Promotion effect of sulfur impurity in alumina support on propane dehydrogenation

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Journal of Energy Chemistry 2022年第7期31卷 332-339,I0009页

作者： Xin-Qian Gao Wen-Cui Li Bin Qiu Jian Sheng fan Wu An-Hui Lu State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina

Alumina materials are widely applied either as a catalyst or support in various industrial catalytic processes. Impurities in alumina that are unfriendly to catalytic performance are inevitably present during the production processes. Facing this problem, we here report that the use of sulfur-containing alumina as the support can generate active alumina-supported platinum catalyst, which exhibits superior propylene selectivity and anti-coking ability during propane dehydrogenation. It demonstrated that the sulfur impurity in alumina is not entirely detrimental. During the reduction process, the formation of gas-phase sulfur species increased the electrons and poisoned unsaturated sites of platinum particles. The sulfur impurity in alumina can be removed through a hydrogen reduction process, and the degree of desulfurization is correlated with the operating temperature. This study demonstrated that the rational use of impurity will contribute to the design of a catalyst with high reactivity for potential applications.

关键词： Alumina Impurity Sulfur Platinum Propane dehydrogenation

Flexible metal–organic frameworks based self-lubricating composite

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Friction 2024年第8期12卷 1816-1827页

作者： Xiao YANG Yunbo WANG Weihua CAO Jinghan ZHENG Changxin LIU Bingli fan Xiaowen QI School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Key Laboratory of Self-Lubricating Spherical Plain Bearing Technology of Hebei Province Yanshan UniversityQinhuangdao 066004China Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing Yanshan UniversityQinhuangdao 066004China Department of Materials.Imperial College London London SW72AZUK

To expand the use of metal–organic frameworks(MOFs)based self-lubricating composite,flexible MOFs MIL-88D has been studied as a nanocontainer for loading *** this work,the mechanism of oleamine adsorption and desorption by MIL-88D was investigated through molecular simulations and *** simulations showed that the oleamines can be physically adsorbed into open MIL-88Ds with the Fe and O atoms of MIL-88D interacting with oleamine *** temperature can cause Ole@MIL-88D to release more oleamines,while higher pressure on Ole@MIL-88D caused less oleamines *** the Ole@MIL-88D was incorporated into epoxy resin(EP)for friction *** optimum mass ratio of MIL-88D to EP is 15 wt%,and the EP/Ole@MIL-88D prefers light load and high frequency *** work suggests that flexible MOFs can be used as a nanocontainer for loading lubricant,and can be used as a new self-lubricating composite.

关键词： self-lubricating composite metal–organic framework(MOFs) MIL-88D molecular dynamic(MD)simulation

When domestication bottleneck meets weed

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Molecular Plant 2022年第9期15卷 1405-1408页

作者： Yanqing Sun Longbiao Guo Qian-Hao Zhu Longjiang fan State Key Lab for Rice Biology China National Rice Research InstituteChinese Academy of Agricultural SciencesHangzhou 311401China Institute of Crop Science&Institute of Bioinformatics Zhejiang UniversityHangzhou 310058China CSIRO Agriculture and Food CanberraACT 2601Australia

DOMESTICATION OF CROPS BY TWO DIFFERENT SCENARIOS Crop domestication is a unique pattern of plant evolution,commonly referred to as the process of generation of cultivated crops from wild specles due to morphological and gen-etic transformation as a result of human intervention and *** on the relationship between weeds and crops in archaeology,evolutionary biology,and genetics have revolution-ized our understanding of the role of weeds in the agroecosystem and of the intricacy of crop ***,generally be-ing effective competitors of crops,are not the targets of human cultivation;however,like crops,they can adapt to human-made habitats and thereby are under unintentional human *** peculiar environment of the agricultural system alows some arable weeds to develop domestication syndrome,Le.,to mimic crop characteristics,such as plant architecture and seed size,to escape being detected and eradicated.

关键词： crops weed cultivated

The Bethesda System for Reporting Thyroid Cytopathology(TBSRTC):A report of 2,781 cases in a Chinese population

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Chinese Journal of Cancer Research 2020年第2期32卷 140-148页

作者： Yanli Zhu Yuntao Song Guohui Xu Zhihui fan Wenhao Ren Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Department of PathologyPeking University Cancer Hospital and InstituteBeijing 100142China Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Department of Head and Neck SurgeryPeking University Cancer Hospital and InstituteBeijing 100142China Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Department of UltrasoundPeking University Cancer Hospital and InstituteBeijing 100142China

Objective:To evaluate the diagnostic utility of The Bethesda System for Reporting Thyroid Cytology(TBSRTC)at Peking University Cancer Hospital,the incidence of noninvasive follicular thyroid neoplasms with papillary-like nuclear features(NIFTP),and the impact of reclassification on cytopathological ***:We performed a retrospective study of thyroid fine-needle aspiration(FNA)cases between April 2014 and March *** FNA results were classified according to ***-surgery histological findings were followed ***:A total of 2,781 thyroid FNAs were *** incidences of the 6 diagnostic categories(DCs I-VI)were 14.8%,17.1%,15.8%,2.3%,11.6%and 38.5%,respectively.A total of 1,122 patients(40.3%)had corresponding histological *** accounted for 0.4%of papillary thyroid carcinoma(PTC)cases,and there was no significant difference in the risk of malignancy(ROM)for each TBSRTC DC between"NIFTP=carcinoma(Ca)"and"NIFTP≠Ca".When"NIFTP=Ca",the sensitivity,specificity,positive predictive value(PPV),negative predictive value(NPV),and accuracy of TBSRTC were 98.0%,84.0%,99.4%,58.3%,and97.5%,***"NIFTP≠Ca",the sensitivity,specificity,PPV,NPV and accuracy of the TBSRTC were 98.1%,81.5%,99.3%,61.1%,and 97.5%,***:TBSRTC is effective in the preoperative diagnosis of thyroid nodules in Peking University Cancer *** impact of the reclassification of NIFTP on cytopathological outcomes is limited because of its low incidence,and the revised ROMs are not suitable for Asian patients.

关键词： Bethesda system thyroid FNA cytopathology NIFTP

Low-complexity model predictive control of a four-level active neutral point clamped inverter without weighting factors

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Transportation Safety and Environment 2024年第2期6卷 96-103页

作者： Chaoqun Xiang Ziyin fan Songyang Jiang Xinan Zhang Shu Cheng School of Traffic and Transportation Engineering Central South UniversityChangsha 410075HunanChina CRRC Dalian Electric Traction R&D Center Co. LtdDalian 116200LiaoningChina School of Engineering The University of Western AustraliaPerthWA 6009Australia

The four-level active neutral point clamped(ANPC)inverter has become increasingly widely used in the renewable energy indus-try since it offers one more voltage level without increasing the total number of active switches compared to the three-level ANPC *** model predictive current control(MPCC)is a promising control method for multi-level ***,the conven-tional MPCC suffers from high computational complexity and tedious weighting factor tuning in multi-level inverter applications.A low-complexity MPCC without weighting factors for a four-level ANPC inverter is proposed in this *** computational burden and voltage vector candidate set are reduced according to the relationship between voltage vector and neutral point voltage *** proposed MPCC shows excellent steady-state and dynamics performances while ensuring the neutral point voltage *** efficacy of the proposed MPCC is verified by simulation and experimental results.

关键词： four-level active neutral point clamped(ANPC)inverter model predictive current control(MPCC) low complexity without weighting factors

Photoelectrochemical performance of TiO_(2) nanotube arrays by in situ decoration with different initial states

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Rare Metals 2021年第3期40卷 720-727页

作者： fan Li Chun-Lai Wang Sheng Ding Kun Yang Chang-Jun Liu Feng Tian Institute of Medical Support Technology Academy of Military SciencesTianjin 300161China

Here,carbon dots(CDs) only or nanocomposites of CDs and TiO_(2)(CDs-TiO_(2)) were used to decorate titanium dioxide nanotube arrays(TiO_(2)NTs) in situ by solvothermal *** initial states of TiO_(2)NTs were prepared for contrast,including the amorphous TiO_(2)NTs(TiO_(2)NTs-0) just experienced anodic oxidation process and that further calcined TiO_(2)NTs(TiO_(2)NTs-450).It was found that the newborn CDs or CDs-TiO_(2)were more likely to anchor on TiO_(2)NTs-0 than the calcined TiO_(2)NTs-450,and more Ti-C bonds were found in the composites which were derived from TiO_(2)NTs-0 after the solvothermal *** evident photocurrent could be demonstrated for either CDs or CDs-TiO_(2)decorated TiO_(2)NTs once exposed to visible *** CDs-TiO_(2)NTs-0 showed the highest photocurrent density(4.51 μA·cm^(-2)).However,the results of photodegradation measurements revealed that CDs-TiO_(2)decorated TiO_(2)NTs with different initial states(especially CDs-TiO_(2)-TiO_(2)NTs-0) showed more excellent photocatalytic activity under both ultraviolet(UV) and visible light illumination.

关键词： Titanium dioxide nanotube arrays Carbon dots Solvothermal technique Photocatalysis

Cu-substituted nickel hexacyanoferrate with tunable reaction potentials for superior ammonium ion storage

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Journal of Materials Science & Technology 2024年第2期169卷 19-27页

作者： Leiyu fan Guangchang Shu Yiwen Liu Haoxiang Yu Lei Yan Liyuan Zhang Jie Shu School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China

In this work,a variety of Cu_(x)Ni_(2-x)Fe(CN)_(6)(x=0,0.4,0.8,1.2,1.6,2)cathodes for ammonium ion batteries are prepared and their electrochemical performances are *** the introduction of copper in nickel hexacyanoferrate,the electrochemical performance varies without changing the structure of nickel *** increase of Cu content in nickel hexacyanoferrate leads to the enhancement of reaction potential and *** results suggest that the substitution of Cu for Ni has a positive effect on improving the cycling stability and rate capacity of nickel hexacyanoferrate when x in Cu_(x)Ni_(2-x)Fe(CN)_(6)is less than ***,Cu_(0.4)Ni_(1.6)Fe(CN)_(6)exhibits the best cycling per-formance(capacity retention of 97.54%at 0.3 C)and the highest rate capacity(41.4 mAh g^(-1)at 10 C)in Cu_(x)Ni_(2-x)Fe(CN)_(6).Additionally,the X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)tests also reveal that the structural evolution of Cu_(0.4)Ni_(1.6)Fe(CN)_(6)is highly reversible upon NH_(4)^(+)***,this work proposes a candidate material for ammoniumion batteries and offers a novel avenue for adjusting the operating potential of the material.

关键词： Nickel hexacyanoferrate Copper hexacyanoferrate NH_(4)^(+)storage Ammonium ion batteries Aqueous batteries

Microporous polythiophene(MPT)-guest complex derived magnetic metal sulfides/carbon nanocomposites for broadband electromagnetic wave absorption

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Journal of Materials Science & Technology 2022年第5期100卷 206-215页

作者： Yingzhi Jiao Siyao Cheng fan Wu Jiaoyan Shi Aming Xie Xufei Zhu Wei Dong School of Chemical Engineering Nanjing University of Science&TechnologyNanjing 210094China School of Mechanical Engineering Nanjing University of Science&TechnologyNanjing 210094China

Electrical and magnetic properties are two crucial factors for the designing of broadband electromagnetic wave absorption(EWA)*** this work,we synthesized various magnetic metal sulfides/carbon(M_(x)S_(y)/C)nanocomposites from the precursor complex of metal in microporous polythiophene(MPT),and systematically investigated their EWA properties and *** characterization results indicate that M_(x)S_(y) were determined to be Fe_(7)S_(8)/C,Co_(9)S_(8)/C and Ni_(4)S_(3)/C,*** is observed that M_(x)S_(y)/C nanocomposites exhibit remarkable EWA performances,where the maximal absorption gets to-51.3 dB,and efficient absorption can be realized in 10.32-18 GHz(7.68 GHz),which is superior to most reported magnetic carbonaceous EWA ***,the efficient absorption can be tuned to cover Ku band X band,demonstrating their great potential in practical *** conductance loss,obvious polarization relaxation,and apparent eddy current loss are deemed to make the predominant contributions to the high-performance *** research opens up the exploration of novel nanocomposite coupling dielectric loss and magnetic loss using MPT-metal complex precursor for EWA applications.

关键词： Microporous polythiophene Metal sulfide Carbon composite Conjugated microporous polymer Electromagnetic wave absorption