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Facile measurement of single-crystal elastic constants from polycrystalline samples

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npj Computational Materials 2017年第1期3卷 325-332页

作者： Xinpeng Du Ji-cheng zhao Department of Materials Science and Engineering The Ohio State UniversityColumbusOHUSA

Elastic constants are among the most fundamental properties of *** of microstructural evolution and constitutive/micro-mechanistic modeling of materials properties require elastic constants that are predominately measured from single crystals that are labor intensive to grow.A facile technique is developed to measure elastic constants from polycrystalline *** technique is based upon measurements of the surface acoustic wave velocities with the help of a polydimethylsiloxane film grating that is placed on a polished surface of a polycrystalline sample to confine surface acoustic waves that are induced by a femtosecond laser and measured using pump-probe time-domain *** backscatter diffraction is employed to measure the crystallographic orientation along which the surface acoustic wave propagates in each grain(perpendicular to the polydimethylsiloxane grating).Such measurements are performed on several grains.A robust mathematical solution was developed to compute the surface acoustic wave velocity along any crystallographic orientation of any crystal structure with given elastic constants and *** inputting various starting values of elastic constants to compute the surface acoustic wave velocities to match experimental measurements in several distinct crystallographic orientations using an optimization algorithm,accurate elastic constant values have been obtained from seven polycrystalline metal samples to be within 6.8% of single-crystal *** new technique can help change the current scenario that experimentally measured elastic constants are available for only about 1% of the estimated 160,000 distinct solid compounds,not to mention the significant need for elastic constants of various solid solution compositions that are the base of structural materials.

关键词： materials. density. constants

Unequal clustering algorithm for WSN based on fuzzy logic and improved ACO

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The Journal of China Universities of Posts and Telecommunications 2011年第6期18卷 89-97页

作者： MAO Song zhao cheng-lin Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China Wireless Network Lab Beijing University of Posts and Telecommunications Beijing 100876 China

This paper proposes a novel energy efficient unequal clustering algorithm for large scale wireless sensor network （WSN） which aims to balance the node power consumption and prolong the network lifetime as long as possible. Our approach focuses on energy efficient unequal clustering scheme and inter-cluster routing protocol. On the one hand, considering each node＇s local information such as energy level, distance to base station and local density, we use fuzzy logic system to determine one node＇s chance of becoming cluster head and hand, adaptive max-min ant colony optimization is used to estimate the corresponding competence radius. On the other construct energy-aware inter-cluster routing between cluster heads and base station （BS）, which balances the energy consumption of cluster heads and alleviates the hot spots problem that occurs in multi-hop WSN routing protocol to a large extent. The confirmation experiment results have indicated the proposed clustering algorithm has more superior performance than other methods such as low energy adaptive clustering hierarchy （LEACH） and energy efficient unequal clustering （EEUC）.

关键词： WSN unequal clustering fuzzy logic adaptive max-min ant colony optimization (ACO) network lifetime

Metal phosphonate-derived cobalt/nickel phosphide@N-doped carbon hybrids as efficient bifunctional oxygen electrodes for Zn-air batteries

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Frontiers of Chemical Science and Engineering 2022年第9期16卷 1367-1376页

作者： Cai-Yue Wang Meng-Qi Gao cheng-Cai zhao Li-Min zhao Hui zhao School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252000China

The exploration of efficient bifunctional electrocatalysts for oxygen reduction reaction and oxygen evolution reaction is pivotal for the development of rechargeable metal–air *** metal phosphides are emerging as promising catalyst candidates because of their superb activity and low ***,a novel metal phosphonate-derived cobalt/nickel phosphide@N-doped carbon hybrid was developed by a carbothermal reduction of cobalt/nickel phosphonate hybrids with different Co/Ni molar *** metal phosphonate derivation method achieved an intimately coupled interaction between metal phosphides and a heteroatom-doped carbon *** resultant Co_(2)P/Ni_(3)P@NC-0.2 enables an impressive electrocatalytic oxygen reduction reaction activity,comparable with those of state-of-the-art Pt/C catalysts in terms of onset potential(0.88 V),4e‒selectivity,methanol tolerance,and long-term ***,remarkable oxygen evolution reaction activity was also observed in alkaline *** high activity is ascribed to the N-doping,abundant accessible catalytic active sites,and the synergistic effect among the *** work not only describes a highefficiency electrocatalyst for both oxygen reduction reaction and oxygen evolution reaction,but also highlights the application of metal phosphonate hybrids in fabricating metal phosphides with tunable structures,which is of great significance in the energy conversion field.

关键词： metal phosphonate cobalt/nickel phosphide N-doped carbon oxygen electrochemistry Zn−air battery

Effect of work hardening discrepancy on strengthening of laminated Cu/CuZn alloys

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Journal of Materials Science & Technology 2022年第8期103卷 67-72页

作者： Zheng Cao zhao cheng Wei Xu Lei Lu Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

To clarify the work hardening discrepancy effect on the strengthening of laminated metals,we designed two laminated Cu/Cu4Zn and Cu/Cu32Zn samples with different layer ***/Cu4Zn has larger work hardening discrepancy between two constituent layers relative to Cu/Cu32Zn,but the yield strengths of two Cu Zn constituents are *** tensile results suggest Cu/Cu4Zn with larger work hardening discrepancy exhibits a significant strengthening at early deformation stage while Cu/Cu32Zn possesses a better *** underlying mechanisms for the strengthening effect are attributed to more geometrically necessary dislocations accumulated at interfaces and severer strain localization due to the larger work hardening discrepancy.

关键词： Laminated Cu/Cu alloys Work hardening Strengthening Interfacial affected zone Strain localization

Liquid phase in-situ synthesis of LiF coated boron powder composite and performance study

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Defence Technology（防务技术） 2020年第3期16卷 635-641页

作者： Yang Xu Qing-zhong Cui cheng-wen zhao State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Shanxi Jiangyang Chemical Factory Shanxi 030000China

Among practical metal additives,boron(B) has a high volumetric heating value,making it a promising choice as a fuel *** B can theoretically yield a large amount of energy upon complete combustion,its combustion is retarded by the initial presence of B oxide,which coats the surfaces of B *** improve the ignition and combustion properties of B powder,LiOH and NH4F were used as precursors to synthesize uniformly LiF-coated B composites(LiF-B) in *** LiF-B mixture was also prepared for comparison using a physical method.X-ray diffraction(XRD),Fourier-transform infrared(FTIR),scanning electron microscope(SEM),and energy-dispersive X-ray spectroscopy(EDS) were used to characterize the morphologies and compositions of the *** thermal and combustion properties of the samples were characterized by thermal gravity-differential thermal gravity(TG-DTG),differential scanning calo rimetry(DSC) and closed bomb *** XRD,FTIR,SEM and EDS results demonstrated the successful preparation of the coated LiF-B *** TG-DTG and closed bomb experiment results indicated that the addition of LiF decreased the ignition temperature of B powder,and increasing its reaction *** results show that when LiF-B was added,the released heat of underwater explosive increased by 6727.2,7280.4 and 3109.6 J/g at heating rates of 5,10,and 15℃/min,***,LiF-B decreased the activation energy of secondary combustion reaction of explosive system as calculated through Kissinger’s method by 28.9%,which indicated an excellent catalytic effect for the thermal decomposition of underwater *** results reveal that LiF can improve the combustion efficiency of B powder,thereby increasing the total energy of *** mechanical sensitivity increased slightly after adding LiF-B to the underwater *** mpared to the underwater explosive with added B,the mechanical sensitivity of the explosive with added LiF-B was significantly

关键词： Boron LiF Coating Thermal decomposition properties Energy efficiency

Boston Ivy-Inspired Disc-Like Adhesive Microparticles for Drug Delivery

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Research 2021年第1期2021卷 1604-1614页

作者： Lijun Cai Guopu Chen Yuetong Wang cheng zhao Luoran Shang Yuanjin zhao State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Zhongshan-Xuhui Hospital The Shanghai Key Laboratory of Medical EpigeneticsThe International Co-Laboratory of Medical Epigenetics and MetabolismMinistry of Science and Technologyand Institutes of Biomedical SciencesFudan UniversityShanghai 200032China Department of Rheumatology Immunology Institute of Translational MedicineThe Affiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjing 210008China

Microparticles with strong adherence are expected as efficient drug delivery ***,we presented an ingenious hydrogel microparticle recapitulating the adhesion mechanism of Boston ivy tendrils adhesive discs(AD)for durable drug *** particles were achieved by replicating a silica colloidal crystal aggregates assembled in a droplet template after rapid solvent *** to their unique shape,the nanostructure,and the sticky hydrogel component,such novel microparticles exhibited prominent adhesive property to the wet tissue *** was demonstrated that the bioinspired microcarriers loading with dexamethasone had a good therapeutic effect for ulcerative colitis due to the strong adhesion ability for prolonging the maintenance of drug *** virtues make the biomimetic microparticles potentially ideal for many practical clinical applications,such as drug delivery,bioimaging,and biodiagnostics.

关键词： environment Boston template

Biomass Microcapsules with Stem Cell Encapsulation for Bone Repair

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Nano-Micro Letters 2022年第1期14卷 95-106页

作者： Lei Yang Yuxiao Liu Lingyu Sun cheng zhao Guopu Chen Yuanjin zhao Department of Rheumatology and Immunology The Affiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjing 210008People’s Republic of China Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325001ZhejiangPeople’s Republic of China Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)Wenzhou 325001ZhejiangPeople’s Republic of China State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096People’s Republic of China

Bone defects caused by trauma,tumor,or osteoarthritis remain challenging due to the lack of effective treatments in *** cell transplantation has emerged as an alternative approach for bone repair and attracted widespread attention owing to its excellent biological activities and therapy *** attempts to develop this therapeutic approach focus on the generation of effective cell delivery vehicles,since the shortcomings of direct injection of stem cells into target ***,we developed a novel core-shell microcapsule with a stem cell-laden core and a biomass shell by using all-aqueous phase microfluidic electrospray *** designed core-shell microcapsules showed a high cell viability during the culture *** addition,the animal experiments exhibited that stem cell-laden core-shell microcapsules have good biocompatibility and therapeutic effect for bone *** study indicated that the core-shell biomass microcapsules generated by microfluidic electrospray have promising potential in tissue engineering and regenerative medicine.

关键词： Microcapsule Bone repair Stem cell therapy Microfluidics Electrospray

n-Alkyl lipid concentrations and distributions in aquatic plants and their individual δD variations

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Science China Earth Sciences 2019年第9期62卷 1441-1452页

作者： Hu LIU Zhonghui LIU cheng zhao Weiguo LIU State Key L aboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an 710061 China University of Chinese Academy of Sciences Beijing 100049 China Department of Earth Sciences The University of Hong Kong Hong Kong 999077 China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China

Aquatic plants are major input sources of autochthonous organic matter in lake sediments, but investigations on fatty acid(FA) and n-alkane distributions in aquatic plants are currently limited, greatly hindering the applications of their isotope geochemistry in lacustrine environments. Here, the reported n-alkyl lipid distributions of aquatic plants in globally studied lakes,together with newly obtained aquatic plant n-alkyl lipid data in Chinese lakes(Yunnan and Inner Mongolia), are used to understand their distribution characteristics. The results show that aquatic plants have predominantly mid-chain lipids(C23–C25 n-alkanes and C22–C24 FAs), differing from that of terrestrial plants(dominant by long-chain lipids), but the long-chain n-alkanes(e.g., C27 and C29) and long-chain FAs(e.g., C26 and C28) also show high abundances in most samples. Submerged plants have high concentrations of long-chain n-alkanes(avg. 47 μg g-1) and long-chain FAs(avg. 170 μg g-1), close to those in terrestrial plants, indicating that submerged plants may make large contributions of long-chain n-alkyl lipids to lake sediments, while the contributions of long-chain n-alkyl lipids derived from algae to lake sediments may be small because of their low concentrations(avg. 2 μg g-1 for n-alkanes and 9 μg g-1 for FAs). We find that lipid molecular proxies(including ACL14-32 and ATR14-18) can be reliably used to distinguish the FAs sourced from algae and other plants, and Paq′ values can be utilized to distinguish the nalkane sources between submerged plants and terrestrial plants. Aquatic plants do not have significant δD differences among different chain-length n-alkanes and FAs for each sample, suggesting that the offset between δD values of different chain-length n-alkyl lipids in lake sediments can help determine sedimentary lipid input sources and infer paleohydrological changes.

关键词： n-Alkanes Fatty acids Hydrogen isotopes Algae Submerged plants

Biomimetic intestinal barrier based on microfluidic encapsulated sucralfate microcapsules

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Science Bulletin 2019年第19期64卷 1418-1425页

作者： cheng zhao Yunru Yu Xiaoxuan Zhang Xiuwen Wu Jianan Ren Yuanjin zhao Department of General Surgery Jinling HospitalMedical School of Nanjing UniversityNanjing210002China State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing210096China

Intestinal barriers play an important role in preventing intestinally derived diseases,and maintaining their function is a promising approach to prevent and treat those ***,inspired by the protection effect of intestinal barriers in live organisms and the mucosa adhesive property of sucralfate,we present a biomimetic intestinal barrier based on microfluidic encapsulated sucralfate *** from the flexible selectivity and precise control of microfluidic electrospray flows,the generated microcapsules were imparted with stomach-tolerant dietary-fibre shells and controllable released sucralfate cores,both of which could contribute to forming a continuous biomimetic intestinal barrier on the *** in vitro adhesive study,in vivo computed tomography(CT)imaging and in vivo imaging system(IVIS)methods,we have demonstrated that the microcapsule-derived biomimetic intestinal barrier can effectively block food fermentation in the gut,reduce generation of fat,decrease disease risk indexes,and prevent *** features make the microfluidic encapsulated sucralfate microcapsules and their resultant biomimetic intestinal barrier an approach for treating obesity and other intestinal diseases.

关键词： Biomimetic Microfluidics Microcapsule Intestinal barrier Gastrointestinal disease