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In situ formed ultrafine metallic Ni from nickel(Ⅱ) acetylacetonate precursor to realize an exceptional hydrogen storage performance of MgH_(2)-Ni-EG nanocomposite

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Journal of Magnesium and Alloys 2023年第9期11卷 3174-3185页

作者： Shaoyang Shen Liuzhang Ouyang Jiangwen Liu Hui Wang Xu-Sheng Yang Min Zhu School of Materials Science and engineering and Key Laboratory of Advanced Energy Storage Materials of Guangdong Province South China University of TechnologyGuangzhou510641China China-Australia Joint Laboratory for Energy&Environmental Materials Key Laboratory of Fuel Cell Technology of Guangdong ProvinceGuangzhouGuangzhou510641China Advanced Manufacturing Technology research Centre Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina research institute for Smart Energy The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

It has been well known that doping nano-scale catalysts can significantly improve both the kinetics and reversible hydrogen storage capacity of MgH_(2) . However, so far it is still a challenge to directly synthesize ultrafine catalysts(e.g., chemical reaction processes. Here, a facile one-step high-energy ball milling process is developed to in situ form ultrafine Ni nanoparticles from the nickel acetylacetonate precursor in the MgH_(2) matrix. With the combined action of ultrafine metallic Ni and expanded graphite(EG), the formed MgH_(2)-Ni-EG nanocomposite with the optimized doping amounts of Ni and EG can still release 7.03 wt.% H_(2) within 8.5 min at 300 ℃ after 10 cycles. At a temperature close to room temperature(50 ℃), it can also absorb 2.42 wt.% H_(2) within 1 h. It can be confirmed from the microstructural characterization analysis that the in situ formed ultrafine metallic Ni is transformed into Mg_(2)Ni/Mg_(2)NiH_4 in the subsequent hydrogen absorption and desorption cycles. It is calculated that the dehydrogenation activation energy of the MgH_(2)-Ni-EG nanocomposite is also reduced obviously in comparison with the pure MgH_(2) . Our work provides a methodology to significantly improve the hydrogen storage performance of MgH_(2) by combining the in situ formed and uniformly dispersed ultrafine metallic catalyst from the precursor and EG.

关键词： Hydrogen storage Magnesium hydride Nickel precursor Size effect Expanded graphite

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engineering Mechanical Strong Biomaterials Inspired by Structural Building Blocks in Nature

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chemical research in Chinese Universities 2023年第1期39卷 92-106页

作者： LI Jiahe MA Chao ZHANG Hongjie LIU Kai engineering research Center of Advanced Rare Earth Materials Ministry of EducationDepartment of ChemistryTsinghua UniversityBeijing100084P.R.China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022P.R.China

The intricate multiscale architectures in natural structural building blocks provide many sources of inspiration for the designs of artificial *** nature,the assembly of highly ordered molecular crystals and amorphous aggregates often derives from inter-and intra-molecular interactions of biomacromolecules,e.g.,proteinaceous *** structural biomaterials derived from the protein self-assembly behave with remarkable mechanical ***,there is still a grand challenge to mimic the mechanical properties of natural protein-based biomaterials in a rational design fashion to yield comparable man-made synthetic *** this review,a brief perspective on current challenges and advances in terms of bioinspired structural materials is *** outline a framework for mimicking protein self-assembly of natural building blocks across multiscale and highlight the critical role of synthetic biology and chemical modifications in material ***,we focus on the design and promising applications of protein-based fibers,adhesives,dynamic hydrogels and engineered living materials,in which natural mechanical functions are effectively reproduced.

关键词： Bioinspired material Protein self-assembly Mechanical property Synthetic biology Molecular engineering

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Co-delivery of anticancer drugs and cell penetrating peptides for improved cancer therapy

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Chinese chemical Letters 2021年第4期32卷 1559-1562页

作者： Xiao Fu Guiqiang Zhang Yulin Zhang Haifeng Sun Shuang Yang Shilei Ni Jiwei Cui Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education School of Chemistry and Chemical EngineeringShandong UniversityJi'nan 250100China department of Neurosurgery Qilu Hospital and Institute of Brain and Brain-Inspired ScienceCheeloo College of MedicineShandong UniversityJi'nan 250012China State Key Laboratory of Microbial Technology Shandong UniversityQingdao 266237China

Delivery systems based on nanoparticles(NPs)have shown great potential to reduce side effects and improve the therapeutic ***,we report the one-pot synthesis of poly(ethylene glycol)-mediated zeolitic imidazolate framework-8(ZIF-8)NPs for the co-delivery of an anticancer drug(i.e.,doxorubicin)and a cell penetrating peptide containing histidine and arginine(i.e.,H4 R4)to improve the efficacy of therapeutic delive *** cargo-encapsulated ZIF-8 NPs are pH-responsive,which are stable at neutral pH and degradable at acidic pH to release the encapsulated *** released H4 R4 can help for endosome/lysosome escape to enhance the cytotoxicity of the encapsulated *** vivo studies demonstrate that the co-delivery of doxo rubicin and H4 R4 peptides can efficiently inhibit tumor growth without significant side *** reported strategy provides a new perspective on the design of drug delivery systems and brings more opportunities for biomedical applications.

关键词： Metal-organic frameworks Lysosome escape pH-responsiveness Drug delivery Poly(ethylene glycol)

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Removal of biomass tar by steam reforming over calcined scallop shell supported Cu catalysts

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Journal of Energy Chemistry 2017年第4期26卷 660-666页

作者： Malinee Kaewpanha Surachai Karnjanakom Guoqing Guan Xiaogang Hao Jingxuan Yang Abuliti Abudula Graduate School of Science and Technology Hirosaki University1-BunkyochoHirosaki 036-8560Japan North Japan research institute for Sustainable Energy(NJRISE) Hirosaki University2-1-3MatsubaraAomori 030-0813Japan department of chemical engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

In this study, the main purpose is to develop low-cost catalysts with high activity and stability for high quality syngas production via steam reforming of biomass tar in biomass gasification process. The calcined waste scallop shell（CS） supported copper（Cu） catalysts are prepared for steam reforming of biomass tar. The prepared Cu supported on CS catalysts exhibit higher catalytic activity than those on commercial CaO and Al;O;. Characterization results indicate that Cu/CS has a strong interaction between Cu and CaO in CS support, resulting in the formation of calcium copper oxide phase which could stabilize Cu species and provide new active sites for the tar reforming. In addition, the strong basicity of CS support and other inorganic elements contained in CS support could enhance the activity of Cu/CS. The addition of a small amount of Co is found to be able to stabilize the catalytic activity of Cu/CS catalysts,making them reusable after regeneration without any loss of their activities.

关键词： Biomass gasification Tar reforming Copper Calcium oxide Scallop shell

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Diverse Structural Design Strategies of MXene‑Based Macrostructure for High‑Performance Electromagnetic Interference Shielding

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Nano-Micro Letters 2023年第12期15卷 419-448页

作者： Yue Liu Yadi Wang Na Wu Mingrui Han Wei Liu Jiurong Liu Zhihui Zeng Key Laboratory for Liquid‑Solid Structural Evolution and Processing of Materials School of Materials Science and EngineeringShandong UniversityJinan 250061People’s Republic of China department of Mechanical engineering The Hong Kong Polytechnic UniversityKowloonHong Kong 999077People’s Republic of China State Key Laboratory of Crystal Materials Institute of Crystal MaterialsShandong 250100China Shenzhen research institute of Shandong University ShenzhenChina School of Chemistry and chemical engineering Shandong UniversityShandong 250100China

There is an urgent demand for flexible,lightweight,mechanically robust,excellent electromagnetic interference(EMI)shielding ***-dimensional(2D)transition metal carbides/nitrides(MXenes)have been potential candidates for the construction of excellent EMI shielding materials due to their great electrical electroconductibility,favorable mechanical nature such as flexibility,large aspect ratios,and simple processability in aqueous *** applicability of MXenes for EMI shielding has been intensively explored;thus,reviewing the relevant research is beneficial for advancing the design of high-performance MXene-based EMI ***,recent progress in MXene-based macrostructure development is reviewed,including the associated EMI shielding *** particular,various structural design strategies for MXene-based EMI shielding materials are highlighted and *** the end,the difficulties and views for the future growth of MXene-based EMI shields are *** review aims to drive the growth of high-performance MXene-based EMI shielding macrostructures on basis of rational structural design and the future high-efficiency utilization of MXene.

关键词： MXene Composite Electromagnetic interference shielding Microstructure Electronics

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Emerging photoluminescence from defective vanadium diselenide nanosheets

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Photonics research 2018年第4期6卷 244-253页

作者： AMIR GHOBADI TURKAN GAMZE ULUSOY GHOBADI ALI KEMAL OKYAY EKMEL OZBAY NANOTAM-Nanotechnology research Center Bilkent University department of Electrical and Electronics engineering Bilkent University UNAM-institute of Materials Science and Nanotechnology Bilkent University department of Physics Bilkent University

In this paper, for the first time to our knowledge in the literature, we demonstrate photoluminescence from two-dimensional(2D) vanadium diselenide(VSe_2) nanosheets(NSs). The preparation of these nanostructures is carried out with a combinational method based on nanosecond pulsed laser ablation(PLA) and chemical exfoliation. For this aim, VSe_2 bulk is first ablated into nanoparticles(NPs) inside a water solution. Afterward,NPs are chemically exfoliated into NSs using lithium intercalation via ultrasonic treatment. Although VSe_2 is a semimetal in its bulk form, its nanostructures show photo-responsive behavior, and it turns into a strongly luminescent material when it is separated into NSs. Based on the obtained results, the surface defects induced during the PLA process are the origin of this photoluminescence from NSs. Our findings illustrate that this new material can be a promising semiconductor for photovoltaic and light emitting diode applications.

关键词： Semiconductors Optical materials Photoluminescence

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Random Networks and Aligned Arrays of Single-Walled Carbon Nanotubes for Electronic Device Applications

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Nano research 2008年第4期1卷 259-272页

作者： Qing Cao John A.Rogers department of Chemistry University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA department of Materials Science and engineering University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA department of Electrical and Computer engineering University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA department of Mechanical Science and engineering University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Frederick-Seitz Materials research Laboratory University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Beckman institute for Advanced Science and Technology University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA

Singled-walled carbon nanotubes(SWNTs),in the form of ultrathin fi lms of random networks,aligned arrays,or anything in between,provide an unusual type of electronic material that can be integrated into circuits in a conventional,scalable *** electrical,mechanical,and optical properties of such fi lms can,in certain cases,approach the remarkable characteristics of the individual SWNTs,thereby making them attractive for applications in electronics,sensors,and other *** review discusses the synthesis and assembly of SWNTs into thin film architectures of various types and provides examples of their use in digital electronic circuits with levels of integration approaching 100 transistors and in analog radio frequency(RF)systems with operating frequencies up to several gigahertz,including transistor radios in which SWNT transistors provide all of the active *** results represent important steps in the development of an SWNT-based electronics technology that could fi nd utility in areas such as fl exible electronics,RF analog devices and others that might complement the capabilities of established systems.

关键词： Carbon nanotubes electronic devices thin-film transistors

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chemically induced local lattice distortions versus structural phase transformations in compositionally complex alloys

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npj Computational Materials 2021年第1期7卷 312-319页

作者： Yuji Ikeda Konstantin Gubaev Jörg Neugebauer Blazej Grabowski Fritz Körmann institute for Materials Science University of StuttgartStuttgartGermany Max-Planck-Institut für Eisenforschung GmbH DüsseldorfGermany department of Materials Science and engineering Delft University of TechnologyDelftThe Netherlands

Recent experiments show that the chemical composition of body-centered cubic(bcc)refractory high entropy alloys(HEAs)can be tuned to enable transformation-induced plasticity(TRIP),which significantly improves the ductility of these *** calls for an accurate and efficient method to map the structural stability as a function of composition.A key challenge for atomistic simulations is to separate the structural transformation between the bcc and theωphases from the intrinsic local lattice distortions in such chemically disordered *** solve this issue,we develop a method that utilizes a symmetry analysis to detect differences in the crystal *** this method in combination with ab initio calculations,we demonstrate that local lattice distortions largely affect the phase stability of Ti–Zr–Hf–Ta and Ti–Zr–Nb–Hf–Ta *** relaxation effects are properly taken into account,the predicted compositions near the bcc–hcp energetic equilibrium are close to the experimental compositions,for which good strength and ductility due to the TRIP effect are observed.

关键词： alloys ductility distortion

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SNP barcodes generated using particle swarm optimization to detect susceptibility to breast cancer

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Natural Science 2013年第3期5卷 359-367页

作者： Cheng-Hong Yang Yu-Da Lin Li-Yeh Chuang Hsueh-Wei Chang department of Biomedical Science and Environmental Biology Center of Excellence for Environmental Medicine Cancer Center Kaohsiung Medical University Hospital Kaohsiung Medical University Kaohsiung Taiwan department of chemical engineering & institute of Biotechnology and chemical engineering I-Shou University Kaohsiung Taiwan department of Electronic engineering National Kaohsiung University of Applied Sciences Kaohsiung Taiwan

Considerable research has been devoted to investigating variations in disease susceptibility using SNPs associated with the individual cooccurrence of single nucleotide polymorphisms (SNPs) in genetic and phenotypic variability. Without the raw genotype data, these association studies are difficult to conduct and often omit SNP interactions, thus limiting their reliability and potential applicability. In this study, we apply a particle swarm optimization (PSO) algorithm to detect and identify the best protective SNP barcodes (i.e., SNP combinations and genotypes with a maximum difference between cases and controls) associated with chronic dialysis patients. SNP barcodes containing different numbers of SNPs were computed. We evaluated the combined effects of 27 SNPs related to nine published epigenetic modifier-related genes on breast cancer. Eleven different SNP combinations were found to be protective associated with the risk of breast cancer (odds ratio, OR p-value in silico analysis.

关键词： Single Nucleotide Polymorphism Particle Swarm Optimization SNP-SNP Interaction Breast Cancer

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Consistent apparent Young’s modulus of human embryonic stem cells and derived cell types stabilized by substrate stiffness regulation promotes lineage specificity maintenance

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Cell Regeneration 2020年第1期9卷 155-170页

作者： Anqi Guo Bingjie Wang Cheng Lyu Wenjing Li Yaozu Wu Lu Zhu Ran Bi Chenyu Huang Jiao Jiao Li Yanan Du department of Biomedical engineering Tsinghua-Peking Center for Life SciencesMOE Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical BiologySchool of MedicineTsinghua UniversityBeijing 100084China School of Life Sciences Tsinghua UniversityBeijing 100084China department of Biomedical engineering McKelvey School of EngineeringWashington University in St.LouisSt.Louis 63130USA institute of Systems engineering Academy of Military SciencesBeijing 100071China department of Dermatology Beijing Tsinghua Changgung HospitalSchool of Clinical MedicineTsinghua UniversityBeijing 102218China Kolling institute University of SydneySydneyNSW 2006Australia

Background:Apparent Young’s modulus(AYM),which reflects the fundamental mechanical property of live cells measured by atomic force microscopy and is determined by substrate stiffness regulated cytoskeletal organization,has been investigated as potential indicators of cell fate in specific cell ***,applying biophysical cues,such as modulating the substrate stiffness,to regulate AYM and thereby reflect and/or control stem cell lineage specificity for downstream applications,remains a primary challenge during in vitro stem cell ***,substrate stiffness could modulate cell heterogeneity in the single-cell stage and contribute to cell fate regulation,yet the indicative link between AYM and cell fate determination during in vitro dynamic cell expansion(from single-cell stage to multi-cell stage)has not been ***:Here,we show that the AYM of cells changed dynamically during passaging and proliferation on substrates with different ***,the same change in substrate stiffness caused different patterns of AYM change in epithelial and mesenchymal cell *** stem cells and their derived progenitor cells exhibited distinguishing AYM changes in response to different substrate stiffness that had significant effects on their maintenance of pluripotency and/or lineage-specific *** substrates that were too rigid or too soft,fluctuations in AYM occurred during cell passaging and proliferation that led to a loss in lineage *** a substrate with‘optimal’stiffness(i.e.,3.5 kPa),the AYM was maintained at a constant level that was consistent with the parental cells during passaging and proliferation and led to preservation of lineage *** effects of substrate stiffness on AYM and downstream cell fate were correlated with intracellular cytoskeletal organization and nuclear/cytoplasmic localization of ***:In summary,this study suggests that optimal substrate stiffness regulated consi

关键词： Apparent Young’s modulus Human embryonic stem cells Substrate stiffness YAP Cell fate

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