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Synthesis and characterization of high strength polyimide/silicon nitride nanocomposites with enhanced thermal and hydrophobic properties

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Chinese Journal of chemical engineering 2021年第4期34卷 446-453页

作者： Tadele Daniel Mekuria Lei Wang Chunhong Zhang Ming Yang Qingtao Lv Diaa Eldin Fouad Polymer Materials Research Center Key Laboratory of Superlight Materials and Surface TechnologyMinistry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Chemistry Department College of Natural and Computational SciencesAssosa UniversityEthiopia

Polyimide(PI)composite films were synthesized incorporating amino modified silicon nitride(Si_(3)N_(4))nanoparticles into PI matrix via in situ polymerization *** mechanical and thermal performances as well as the hydrophobic properties of the as prepared composite films were investigated with respect to the dosage of the filler in the PI *** to Thermogravimetric(TGA)analysis,meaningful improvements were achieved in T5(5%weight loss temperature)and T10(10%weight loss temperature)up to 54.1℃ and 52.4℃,respectively when amino functionalized nano Si_(3)N_(4) particles were introduced into the PI *** differential scanning calorimetry(DSC)results revealed that the glass transition temperature(Tg)of the composites was considerably enhanced up to 49.7℃ when amino functionalized Si_(3)N_(4) nanoparticles were incorporated in the PI *** to the neat PI,the PI/Si_(3)N_(4) nanocomposites exhibited very high improvement in the tensile strength as well as Young’s modulus up to 105.4%and 138.3%,*** to the neat PI,the composites demonstrated highly decreased water absorption behavior which showed about 68.1%enhancement as the content of the nanoparticles was increased to 10 wt%.The SEM(Scanning electron microscope)images confirmed that the enhanced thermal,mechanical and water proof properties are essentially attributed to the improved compatibility of the filler with the matrix and hence,enhanced distribution inside the matrix because of the amino groups on the surface of Si_(3)N_(4) nanoparticles obtained from surface functionalization.

关键词： Silicon nitride(Si_(3)N_(4))nanoparticles Polyimide composites Mechanical properties Thermal properties Hydrophobicity

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Host–Guest Molecular Recognition at Liquid–Liquid Interfaces

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engineering 2021年第5期7卷 603-614页

作者： Beibei Wang Hao Chen Tan Liu Shaowei Shi Thomas P.Russell Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Department of Polymer Science and Engineering University of MassachusettsAmherstMA 01003USA Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

Host–guest molecular recognition at the liquid–liquid interface endows the interface with unique properties,including stimuli-responsiveness and self-regulation,due to the dynamic and reversible nature of non-covalent *** research efforts have been put into the preparation of supramolecular interfacial systems such as films and microcapsules by integrating functional components(e.g.,colloidal particles,polymers)at the interface,providing tremendous opportunities in the areas of encapsulation,delivery vehicles,and biphasic reaction *** this review,we summarize recent progress in supramolecular interfacial systems assembled by host–guest chemistry,and provide an overview of the fabrication process,functions,and promising applications of the resultant constructs.

关键词： Liquid-liquid interface Self-assembly Host-guest chemistry Microcapsules

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Sedimentary Facies, Depositional Environment and Reservoir Quality of Group-B Shallow Clastic Reservoir in the Malay Basin, Malaysia

Sedimentary Facies, Depositional Environment and Reservoir Q...

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2023 SPE Nigeria Annual International Conference and Exhibition, NAIC 2023

作者： Bashiron, N. Johari, S. Sidek, A. Agi, A. Ariffin, M.H. Supee, A. Ridzuan, N. Aini Mahat, S.Q. Department of Petroleum Engineering Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia Johor Johor Bahru Malaysia PETRONAS Carigali Sdn. Bhd. PETRONAS Twin.Tower Kuala Lumpur Malaysia Faculty of Chemical and Process Engineering Technology College of Engineering Technology Universiti Malaysia Pahang Gambang Pahang Malaysia Geology Program Faculty of Science & Technology Universiti Kebangsaan Malaysia Bangi Selangor Malaysia

ISBN: (纸本)9781959025177

Shallow reservoirs in Group-B of MS-field in Malay Basin, Terengganu's offshore, Malaysia were explored for development. Poor understanding of depositional settings, stratigraphic context, lithofacies, reservoir geometry, reservoir quality, and heterogeneity are some of the difficulties encountered in developing these shallow reservoirs. In this study, these challenges were circumvented by performing reservoir architecture and quality analysis. This was achieved by integrating the interpretation from the cores, well logs, petrographic and petrophysical analyses for depositional model generation, lithofacies description, as well as reservoir geometry, continuity, and quality determination. Five lithofacies were identified in Group- B, namely: laminated mudstone (ML), bioturbated mudstone (MB), heterolithic mud dominated (MH), heterolithic sand dominated (SH), and bioturbated sandstone (SB). The sediments encountered in ML and SB lithofacies consist of moderate to good reservoir quality, while for SH and MH, they ranged from high to low quality. This study provides a better insight to the shallow reservoir heterogeneity in MS-field and the results obtained could also be applied to the other similar shallow reservoirs for characterization and modelling improvement processes. Copyright © 2023 Society of Petroleum Engineers.

关键词： Stratigraphy

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Photoluminescent chiral carbon dots derived from glutamine

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Chinese chemical Letters 2021年第12期32卷 3916-3920页

作者： Wenyan Ma Bolun Wang Yonggang Yang Jiyang Li State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Department of Polymer Science and Engineering College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

The integration of luminescence and chirality in carbon dots(CDs) encourages candidates to explore novel functions and applications of CDs, however, the preparation of chiral CDs is very limited. Herein, we report a hydrothermal method to fabricate chiral CDs by utilizing amino acid enantiomers as the precursors. LGln-CDs or DGln-CDs with uniform size of 3–4 nm show excitation-dependent blue fluorescence in solutions. Circular dichroism measurement confirms the opposite optical rotation of chiral CDs in the region from 200 nm to 300 nm, and the signals can be regulated by concentrations of CDs solution. Timedependent density functional calculation reveals that polypeptides may exist on the surface of CDs due to the polycondensation of L/DGln at high temperature, and the optical activity of CDs originates from the stacking of neighboring carbonyl groups. The facile synthetic methodology proposed will provide potential opportunities for the preparation and application of chiral and chiroptical CDs-based materials.

关键词： Chirality Carbon dots Photoluminescence Circular dichroism Sensors

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Slippery Photothermal Trap for Outstanding Deicing Surfaces

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Journal of Bionic engineering 2021年第3期18卷 548-558页

作者： Muhammad Imran Jamil Qiongyan Wang Amjad Ali Munir Hussain Tariq Aziz Xiaoli Zhan Qinghua Zhang Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Zhejiang Sucon Silicone Co. Ltd.ShaoxingShaoxing 312000China Department of Polymer Science and Engineering Zhejiang UniversityHangzhou 310027China Institute of Zhejiang University-Quzhou Quzhou 324000China

Ice accumulation is a safety and operational threat in power lines,wind turbines,and *** having both passive anti-icing and active deicing functionalities are very ***,we report a self-cleaning slippery photothermal trap,which is icephobic passively and deice the surfaces actively by converting sun light to heat at the ice-substrate *** photothermal trap consists of three layers:a candle soot layer act as solar radiation absorber,a magnetic iron oxide Fe_(3)O_(4) nanoparticles layer act as heat spreader for lateral dispersal of sun light,and Room Temperature Vulcanized(RTV)insulation to reduce the transverse heat *** illumination under microsolar 300,the temperature of the surface increased by 40℃ within 200 *** heat confinement at the magnetic Fe_(3)O_(4) na-noparticles layer leads to rapid increase of the surface temperature,ice start to melt and silicone lubricant facilitates the ice *** slippery photothermal trap removed the frozen droplet(10 fiL)within 40 s upon the illumination of sun light and the frozen droplet was completely converted into water after 7 min illumination of solar light at-20℃.The developed slippery photothermal trap also melted the fully frost covered layer within 100 s at-20℃ under *** average defrosted length(25 mm)was also observed by irradiation of laser light for 45 *** self-cleaning slippery photothermal coating showed outstanding deicing performance at subzero temperature for long term due to the infusion of silicone oil into the nanostructures and same chemical composition with binder.

关键词： slippery photothermal trap candle soot iron oxide nanoparticles icephobic self-cleaning

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Steric stabilization of cellulose nanocrystals by dextran grafting

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Cellulose 2025年 1-8页

作者： Tanaka, Takahide Araki, Jun Kuga, Shigenori Yabuki, Akihiro Chemical Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima Japan Faculty of Textile Science and Technology Shinshu University Nagano Japan Department of Biomaterials Science Graduate School of Agriculture and Life Sciences The University of Tokyo Bunkyo-ku Japan

In this study, an enhanced dispersion stability of cellulose nanocrystals was achieved by terminal grafting of dextran (alpha-1,6 glucan) onto their surface. The carbon at the 6-position of the nanocrystal was first oxidized by the TEMPO method; then, the introduced carboxyl group on the surface of the cellulose nanocrystal was coupled with the terminal amino group of terminally aminated dextran using N-hydroxysuccinimide and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide. Terminally aminated dextran was obtained by reductive amination using sodium cyanoborohydride and ammonium chloride. The weight gain induced by grafting reached 184% of the carboxylated cellulose nanocrystal, resulting in a high dispersion stability. The dispersion stability was evaluated by calculating the change in viscosity before and after adding salt. Typically, cellulose nanocrystals are charged colloids; hence, adding salt reduces their dispersion stability and increases their viscosity. However, the addition of 0.05 M CaCl2 to a suspension of dextran-grafted cellulose nanocrystals did not cause a noticeable increase in viscosity or turbidity. This enhanced stability highlights the effectiveness of coating cellulose nanocrystals with water-soluble polymers.

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Highly efficient removal of trace lead(Ⅱ)from wastewater by 1,4-dicarboxybenzene modified Fe/Co metal organic nanosheets

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Journal of Materials science & Technology 2022年第3期98卷 212-218页

作者： Junmao Hong Le Kang Xiaofeng Shi Renbo Wei Xianmin Mai Duo Pan Nithesh Naik Zhanhu Guo School of Environment and Safety Engineering School of Materials Science and TechnologyInstitute of Advanced Energy Materials and SystemsNorth University of ChinaTaiyuanChina School of Chemical Engineering Northwest UniversityXi’an 710069China School of Urban Planning and Architecture Southwest Minzu UniversityChengdu 610041China Key Laboratory of Materials Processing and Mold(Zhengzhou University) National Engineering Research Center for Advanced Polymer Processing TechnologyMinistry of EducationZhengzhou UniversityZhengzhou 450000China Department of Mechanical&Manufacturing Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnataka 576104India Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996United States

A novel Fe/Co metal organic complex nanosheet modified by 1,4-dicarboxybenzene(BDC),i.e.,FeCo@BDC,was prepared,and highly efficient removal performance for trace lead(Ⅱ)(Pb^(2+))was demonstrated in the neutral aqueous *** removal rates were higher than 95%and the adsorption was equilibrated in 15 *** isotherms and kinetics for the adsorption Pb^(2+)by the FeCo@BDC adsorbents followed Langmuir model and pseudo-second-order model,*** maximum adsorption capacity was 220.48 mg g^(-1).The FeCo@BDC adsorbents also own a prominent regeneration *** prominent performance of in the removal of trace Pb^(2+)makes FeCo@BDC an ideal candidate as commercial adsorbent materials.

关键词： Metal organic complex Nanosheet Trace level Lead(Ⅱ) Adsorption

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Making Passive Daytime Radiative Cooling Metafabrics on a Large Scale

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Advanced Fiber Materials 2022年第1期4卷 3-4页

作者： Shaowu Pan Huisheng Peng State Key Laboratory for Modifcation of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University2999 Renmin RoadShanghai 201620China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Scienceand Laboratory of Advanced MaterialsFudan UniversityShanghai 200438China

Cooling is pervasive in modern society and contributes signifcantly to global energy use.A hierarchical-morphology metafabric has been recently reported to show efcient passive daytime radiative cooling ability and may be also easily scaled up by industrial textile manufacturing *** above study represents an important advance in personal thermal management through the use of intelligent garments.

关键词： technology. hierarchical intelligent

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The 10^(th)macrocylic arene supramolecular chemistry symposium

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Chinese chemical Letters 2023年第12期34卷 1-3页

作者： Shuquan Zhang Meijin Lin Andrew C.H.Sue Liping Cao Feng Wang Cheng Yang Tao Tu Feihe Huang Leyong Wang Key Laboratory of Molecule Synthesis and Function Discovery and Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated MaterialsCollege of ChemistryFuzhou UniversityFuzhou 350116China College of Zhicheng Fuzhou UniversityFuzhou 350002China College of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China College of Chemistry and Materials Science Northwest UniversityXi'an 710069China CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Department of ChemistryFudan UniversityShanghai 200438China Stoddart Institute of Molecular Science Department of ChemistryZhejiang UniversityHangzhou 310058China Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

In the last few decades,there has been a rapid emergence and growing interest in synthetic macrocyclic arenes,such as calixarenes[1,2],cyclophanes[3],cyclotriveratrylenes[4],pillararenes[5-7],and other novel macrocyclic arenes[8-10].These molecules have garnered significant attention in supramolecular chemistry for their fascinating structures,intrinsic cavities,ease of structural and property modifications and wide range of applications[11-14].

关键词： chemistry macrocyclic property

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engineering the axial coordination of cobalt single atom catalysts for efficient photocatalytic hydrogen evolution

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Nano Research 2024年第6期17卷 5114-5121页

作者： Ning Kang Lingwen Liao Xue Zhang Zhen He Binlu Yu Jiahong Wang Yongquan Qu Paul KChu Seeram Ramakrishna Xue-Feng Yu Xin Wang Licheng Bai Materials Interfaces Center Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences(CAS)Shenzhen 518055China Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and NanotechnologyCAS Center for Excellence in NanoscienceInstitute of Solid State PhysicsChinese Academy of SciencesHefei 230031China Department of Chemistry City University of Hong KongKowloonHong Kong 999077China Hong Kong Branch of National Precious Metals Material Engineering Research Center(NPMM) City University of Hong KongKowloonHong Kong 999077China Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Department of Physics and Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong 999077China National University of Singapore(NUS)Centre for Nanofibers and Nanotechnology Department of Mechanical EngineeringNational University of SingaporeSingapore 117542Singapore

Improving the catalytic activity of non-noble metal single atom catalysts(SACs)has attracted considerable attention in materials *** optimizing the local electronic structure of single atom can greatly improve their catalytic activity,it often involves in-plane modulation and requires high ***,we report a novel strategy to manipulate the local electronic structure of SACs via the modulation of axial Co-S bond anchored onto graphitic carbon nitride(C_(3)N_(4))at room temperature(RT).Each Co atom is bonded to four N atoms and one S atom(Co-(N,S)/C_(3)N_(4)).Owing to the greater electronegativity of S in the Co-S bond,the local electronic structure of the Co atoms is available to be controlled at a relatively moderate ***,when employed for the photocatalytic hydrogen evolution reaction,the adsorption energy of intermediate hydrogen(H*)on the Co atoms is remarkably *** the presence of the Co-(N,S)/C_(3)N_(4)SACs,the hydrogen evolution rates reach up to 10 mmol/(g·h),which is nearly 10 and 2.5 times greater than the rates in the presence of previously reported transition metal/C_(3)N_(4)and noble platinum nanoparticles(PtNPs)/C_(3)N_(4)catalysts,*** to the tailorable axial Co-S bond in the SAC,the local electronic structure of the Co atoms can be further optimized for other photocatalytic *** axial coordination engineering strategy is universal in catalyst designing and can be used for a variety of photocatalytic applications.

关键词： transition metal single-atom local electronic structure photocatalytic hydrogen evolution graphitic carbon nitride axial coordination environment

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