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Mechanical properties and microstructure of multilayer graphene oxide cement mortar

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Frontiers of Structural and Civil Engineering 2021年第4期15卷 1058-1070页

作者： Jun LIU Luxi ZHAO Fei CHANG lin CHI School of Environment and Architecture University of Shanghai for Science and TechnologyShanghai200093China

This study reports on the effects of multilayer graphene oxide(MGO)on compressive strength,flexural strength,and microstructure of cement *** cement mortar was prepared with type ***.52.5 Portland cement,standard sand,and *** mixes were prepared with inclusion of MGO(0%,0.02%,0.04%,and 0.06%by weight of cement).The testing result shows that the compressive of GO-cement mortar increased by 4.84%–13.42%,and the flexural strength increased by 4.37%–8.28%at 3 ***-cement mortar’s compressive strength and flexural strength at 7 d increased by 3.84%–12.08%and 2.54%–13.43%,*** made little contribution to the increases of compressive strength and flexural strength of cement mortar at 28 *** results of X-ray diffraction(XRD),scanning electron microscope(SEM),and nitrogen(N2)adsorption/desorption tests show that the types of hydration products and crystal grain size did not change after adding ***,it can help to improve the microstructure of the cement mortar via regulating hydration products and can provide more condensed cores to accelerate ***,the regulating action of MGO for the microstructure of cement mortar at an early age was better than that at 28 d.

关键词： graphene oxide cement mortar mechanical properties microstructure

Nanoparticle Dispersion and Glass Transition Behavior of Polyimide-grafted Silica Nanocomposites

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Chinese Journal of Polymer Science 2020年第1期38卷 100-108,I0008页

作者： Sha-Ni Hu Yu lin Guo-Zhang Wu Shanghai Key Laboratory of Advanced Polymeric Materials School of Materials Science and Engineering East China University of Science and Technology

How to control the spatial distribution of nanoparticles to meet different performance requirements is a constant challenge in the field of polymer *** studies have been focused on the flexible polymer chain *** this study,the rigid polyimide(PI) chain grafted silica particles with different grafting chain lengths and grafting densities were prepared by "grafting to" method,and the influence of polymerization degree of grafted chains(N),matrix chains(P),and grafting density(a) on the spatial distribution of nanoparticles in the PI matrix was *** glass transition temperature(Tg) of PI composites was systematically investigated as *** results show that silica particles are well dispersed in polyamic acid composite systems,while aggregation and small clusters appear in PI nanocomposites after thermal ***,the particle size has no impact on the spatial distribution of *** σ·N0.5<<(N/P)2,the grafted and matrix chains interpenetrate,and the frictional resistance of the segment increases,resulting in restricted relaxation kinetics and Tg increase of the PI composite *** addition,smaller particle size and longer grafted chains are beneficial to improving Tg of composites These results are all propitious to complete the microstructure control theory of nanocomposites and make a theoretical foundation for the high performance and multi-function of PI nanocomposites.

关键词： Polyimide grafted nanoparticle Dispersion morphology Glass transition temperature

Efficient heterogeneous integration of InP/Si and GaSb/Si templates with ultra-smooth surfaces

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Science China(Information Sciences) 2022年第8期65卷 238-246页

作者： Tingting JIN Jiajie lin Tiangui YOU Xiaolei ZHANG Hao LIANG Yifan ZHU Jialiang SUN Hangning SHI Chaodan CHI Min ZHOU Robert KUDRAWIEC Shumin WANG Xin OU State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences College of Information Science and Engineering Jiaxing University School of Information Science and Technology Shanghai Tech University Department of Semiconductor Materials Engineering Wroclaw University of Science and Technology Department of Microtechnology and Nanoscience Chalmers University of Technology

Heterogeneous integration of InP and GaS b on Si substrates holds a huge potential interest in near-infrared and mid-infrared optoelectronic devices. In this study, 2-inch 180-nm-thick InP and 185-nmthick GaS b thin layers were successfully transferred onto the Si substrates to form high-quality and ultrasmooth InP/Si and GaS b/Si templates using molecular beam epitaxy(MBE) and the ion-slicing technique together with selective chemical etching. The relocation of the implantation-introduced damage in the sacrificial layer enables the transfer of relatively defect-free InP and GaS b thin films. The sacrificial layers were completely etched off by selective chemical etching, leaving ultra-smooth epitaxial surfaces with a roughness of 0.2 nm for the InP/Si template and 0.9 nm for the GaS b/Si template, respectively. Thus, the chemical mechanical polishing(CMP) process was not required to smooth the surface which usually introduces particles and chemical contaminations on the transferred templates. Furthermore, the donor substrate is not consumed and can be recycled to reduce the cost, which provides a paradigm for the sustainable and economic development of the Si integration platform.

关键词： heterogeneous integration InP/Si GaSb/Si MBE ion-slicing technique selective chemical etching

Thermodynamic modeling of Cr-Al-C and Ni-Al-C systems for low-density steels

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Journal of Iron and Steel Research(International) 2020年第10期27卷 1190-1199页

作者： Wei-sen Zheng Yan-lin He Xiao-gang Lu State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

The so-called low-density steels have generated a lot of interests with their high specific strength and ductility due to the addi-tion of the light element *** order to accelerate the low-density steel design,a thermodynamic database has been developedwithin the present author *** Al-containing systems,i.e.,Cr-Al-Cand Ni-Al-C,were modeled and optimirzed with CALPHAD approach based on the reliable binary *** Cr-Al-C,system,the Gibbs energy of Cr2AlC phasewas described by a temperature-dependent polynomial with the aid of the experimental data on the heat capacity,instead of estimating heat capacity from Ncumann-Kopp *** incongruent melting temperature of Cr2AlC is 1762 K with theinvariant reaction of liquid+Cr3C2+Al4C3→*** phase equilibria between Cr2AlC and binary phases were wellreproduced by using the present model *** Ni-Al-C system,the liquid,fec and bec phases have been optimizedto fit the carbon solubility in these three phases.A good agreement between the calculated and experimental data has beenobtained using the present description of Ni-Al-C *** reliable descriptions of the two ternary systems developedin the present work can be implemented into the thermodynamic database for low-density steels.

关键词： Cr-Al-C system Ni-Al-C system Thermodynamic model CALPHAD Low-density steel

Long non-coding RNA tagging and expression manipulation via CRISPR/Cas9-mediated targeted insertion

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Protein & Cell 2018年第9期9卷 820-825页

作者： Tian-lin Cheng Zilong Qiu Institute of Neuroscience State Key Laboratory of NeuroscienceCAS Center for Excellence in Brain Science and IntelligenceTechnology Chinese Academy of Sciences Shanghai 200031China

Dear Editor, Long non-coding RNAs （IncRNAs）, defined as RNA transcripts longer than 200 nucleotides without the protein-coding ability （Carninci et al., 2005）, share many features with protein-coding messenger RNAs （mRNAs） such as polyadenylated 5＇ ends and multi-exonic structures （Guttman et al., 2010）. Though expression levels are less abundant, IncRNAs outnumber mRNAs with more diverse regulatory functions （Quinn and Chang, 2016）. They may serve as decoys, sponges, signals or scaffolds in regulating chromatin conformation, nuclear organization, gene expression, and protein activity in cis or trans manner （Ulitsky and Bartel, 2013; Quinn and Chang, 2016）. LncRNAs are involved in various physiological processes and their lossor gain-offunction mutations have been implicated in the pathogenesis of human diseases （Wapinski and Chang, 2011）.

关键词： GENOME linCRNAS

Host defense peptide-mimicking peptide polymer-based antibacterial hydrogel enables efficient healing of MRSA-infected wounds

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Science China Chemistry 2023年第6期66卷 1824-1833页

作者： Zhongqian Qiao Wenjing Zhang Yueming Wu Weinan Jiang Ning Shao Jiayang Xie Guixue Xia Qimeng Chen Zhefeng Liu Jingcheng Zou Jiawei Gu Shifang Luan Haodong lin Runhui Liu State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai 200237China Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic ChemistryShanghai Frontiers Science Center of Optogenetic Techniques for Cell MetabolismResearch Center for Biomedical Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Department of Orthopedic Surgery Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Wound infections are a compelling health issue caused by the invasion and proliferation of pathogens in wound *** hydrogels are widely used to achieve anti-infectious wound ***,due to the quick emergence of drugresistant bacteria,such as methicillin-resistant Staphylococcus aureus(MRSA),wound infection has been a formidable challenge to human *** address MRSA-infected wounds,an antibacterial peptide polymer-loaded hyaluronic acid(HA)hydrogel(Gel-HA@P)is *** peptide polymer is designed to mimic host defense peptides as the antibiotic alternative showing potent antibacterial activity,low susceptibility to drug resistance and good stability against *** is biocompatible and biodegradable hydrogel substrate as a primary constituent of the extracellular matrix and suitable for cell migration and wound ***-HA@P shows potent activity against MRSA in vitro and in vivo,low toxicity during the treatment and promotes the wound healing in *** design has proven to be an effective and antibiotic-free strategy to enable the healing of MRSA-infected wounds.

关键词： peptide polymer wound healing MRSA drug-resistance host defense peptide

Reducing relapse and accelerating osteogenesis in rapid maxillary expansion using an injectable mesoporous bioactive glass/fibrin glue composite hydrogel

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Bioactive Materials 2022年第12期7卷 507-525页

作者： Hanjiang Zhao Xiangyu Wang Anting Jin Minjiao Wang Zeying Wang Xingtai Huang Jiewen Dai Xudong Wang Dan lin Steve GF.Shen Department of Oral&Cranio-Maxillofacial Surgery Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineCollege of StomatologyShanghai Jiao Tong UniversityNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of Stomatology&Shanghai Research Institute of StomatologyShanghai200011PR China Shanghai University of Medicine and Health Sciences Shanghai201318China

Rapid maxillary expansion(RME),as a common treatment for craniomaxillofacial deformity,faces the challenge of high relapse rates and unsatisfactory therapeutic *** this study,a standardized Sprague-Dawley(SD)rat RME model was first established with a modified expander as well as retainer design and optimized anterior maxillary expanding force of 100 g which exerted the most synchronized mobility of mid-palatal suture and *** the standardized model,the high relapse rate was proven to be attributed to insufficient osteogenesis in expanded suture,requiring long-term retainer wearing in clinical *** reduce the relapse rate,mesoporous bioactive glass/fibrin glue(MBG/FG)composite hydrogels were developed for an in situ minimal invasive injection that enhance osteogenesis in the expanded *** component of 1 wt%MBG was adopted for enhanced mechanical strength,matched degradation rate and ion dissolution,excellent in vitro biocompatibility and *** of 1%MBG/FG composite hydrogel on osteogenesis in expanded mid-palatal sutures with/without retention were evaluated in the standardized *** results demonstrated that injection of 1%MBG/FG composite hydrogel significantly promoted bone formation within the expanded mid-palatal suture,inhibited osteoclastogenesis and benefited the balance of bone remodeling towards *** of retainer and injectable biomaterial was demonstrated as a promising treatment to reduce relapse rate and enhance osteogenesis after *** model establishment and the composite hydrogel development in this article might provide new insight to other craniomaxillofacial deformity treatment and design of bone-repairing biomaterials with higher regenerative efficiency.

关键词： Rapid maxillary expansion Sutural distraction osteogenesis Injectable hydrogel Mesoporous bioactive glass Bone regeneration

Enhanced ethanol oxidation over Pd nanoparticles supported porous graphene-doped MXene using polystyrene particles as sacrificial templates

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Rare Metals 2022年第9期41卷 3170-3179页

作者： Yi-Zhe Chen Ming Zhou Yu-Fu Huang Yan-Yun Ma Luo-Yi Yan Xin-Wen Zhou Xin-Zhou Ma Xue-ling Zhao Cheng Chen Juan Bai Dong-Hai lin Shanghai Engineering Research Center of Advanced Thermal Functional Materials Shanghai Key Laboratory of Engineering Materials Application and EvaluationSchool of Energy and MaterialsShanghai Polytechnic UniversityShanghai201209China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou215123China College of Biological and Pharmaceutical Sciences China Three Gorges UniversityYichang443002China School of Materials Science and Hydrogen Energy Foshan UniversityFoshan528000China School of Chemistry and Physics Queensland University of TechnologyBrisbaneQLD4000Australia

Fabrication of superior catalytic performance palladium-based catalysts with affordable cost is the key to develop direct ethanol fuel ***,Pd-decorated three-dimensional(3D)porous constructed from graphene oxide(GO)and MXene combining with polystyrene(PS)particles as sacrificial templates(Pd/GO-MXene-PS)to elevate the catalytic performance for ethanol oxidation was *** 3D porous interconnected structure of Pd/GO-MXene-PS was characterized by scanning electron microscope(SEM),transmission electron microscope(TEM)and Brunner−Emmet−Teller(BET).By optimizing the doping ratio of MXene to GO,the mass activity of Pd/GO_(5)-MXene_(5)-PS(2944.0 mA·mg^(−1))was 3.0 times higher than that of commercial Pd/C(950.4 mA·mg^(−1))toward ethanol oxidation in base ***,the rotating disk electrode(RDE)results demonstrated that Pd/GO5-MXene5-PS had a faster kinetics of ethanol *** enhanced ethanol oxidation over Pd/GO5-MXene5-PS could attribute to the excellent 3D interconnected porous structure,large surface area,good conductivity and homogeneous Pd *** work provided a new idea for creating 3D porous MXene composite materials in electrocatalysis.

关键词： Pd nanoparticles Ethanol oxidation Graphene MXene Polystyrene(PS)template Rotating disk electrode(RDE)

Carbon deficiency introduced plasticity of rock-salt-structured transition metal carbides

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Journal of Materials Science & Technology 2023年第33期164卷 205-214页

作者： Buhao Zhang Youwei Wang Jie Yin Yichen Wang Hangfeng Zhang Tamás Csanádi Ján Dusza Michael J.Reece Nan lin Xiao Yang Xuejian Liu Zhengren Huang Dongliang Jiang State Key Laboratory of High-Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Faculty of Engineering University of NottinghamNottinghamNG7 2RDUnited Kingdom School of Engineering and Materials Science Queen Mary University of LondonMile End RoadLondon E1 4NSUK Institute of Materials Research Slovak Academy of SciencesWatsonova 4704353KošiceSlovak Republic College of Materials Science and Engineering Hunan UniversityChangsha410082China

High-hardness rock-salt structured transitional metal carbides(TMC)are attracting substantial interest as potential next-generation thermal protection ***,the intrinsic brittleness of TMC ceramics impedes their performance in aerodynamically harsh *** this work,a promising strategy is proposed to introduce plasticity in TaC–HfC solid solutions by manipulating carbon *** approach combines density-functional theory(DFT)with experiments and takes Pugh's ratio(k)as the *** of carbon atoms in TaC–HfC solid solutions results in the de-localizing of valence electrons,deviation of spatial modulus along different crystal plane directions,and leading to significant elastic *** carbon deficient Ta_(0.8)Hf_(0.2)C_(0.8) is predicted to be a‘softer phase’with reduced modulus and Pugh's ratio(k=0.58).A series of Ta1–xHfxCy(x=0.2 and 0.8,y=0.8,0.9,and 1.0)bulk ceramics are experimentally fabricated by an excessive metal alloying *** and hexagonal close-packed structured carbides are derived when the carbon deficiency y decreased to *** indentation modulus drops from 641.8±14.8 GPa for Ta_(0.8)Hf_(0.2)C_(1.0) to 555.8±9.9 GPa for *** specific stoichiometric composition of Ta_(0.8)Hf_(0.2)C_(0.8) is experimentally verified to possess both plasticity(k=0.41)and ultra-high nanohardness(41.3±1.3 GPa).

关键词： Brittle Plasticity Transitional metal carbides Pugh's ratio Carbon deficiency