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One-step synthesis of FeO(OH)nanoparticles by electric explosion of iron wire underwater

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Defence Technology（防务技术） 2022年第1期18卷 133-139页

作者： Hao Yin Xin Gao Peng-wan Chen Insitute of Systems Engineering China Acaderry of Engineering PhysicsMianyang.Sichuan 612900.China State Key Laboratory of Explosion Science and Technology Beijing Ins titute of Technology Beijing100081.China

In this study,we investigated electric explosion of iron wire in distilled water with different energy input adjusted by charging voltage.The as-prepared samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy(XPS),showing the presence of iron and multiple iron-based compounds oxides with contents influenced by the experimental conditions.In particular,pure FeO(OH)nanoparticles were obtained using electric explosion of iron wire with energy input of 1125 J at charging voltage of 15 kV.Analysis of discharge current and resistive voltage data indicate that the high energy input induced bystrong plasma discharge at high charging voltage is a key factor to form FeO(OH).This study presents a one-step method to synthesize FeO(OH)nanoparticles using electric explosion of iron wire.

关键词： Electric wire explosion Plasma tunnel Nanopartides FeO(OH)

Application of the Chemical-Looping Concept for Azoetrope Separation

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Engineering 2021年第1期7卷 84-93页

作者： Xin Gao Xueli Geng School of Chemical Engineering and Technology Tianjin University&National Engineering Research Center of Distillation Technology&Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin 300350China

The need for the separation of azeotropic mixtures for the production of high-end chemicals and resource recovery has spurred significant research into the development of new separation methods in the chemical industry.In this paper,a green and sustainable method for azeotrope separation is proposed based on a chemical-looping concept with the help of reversible-reaction-assisted distillation.The central concept in the chemical-looping separation(CLS)method is the selection of a reactant that can react with the azeotrope components and can also be recycled by the reverse reaction to close the loop and achieve cyclic azeotrope separation.This paper aims to provide an informative perspective on the fundamental theory and applications of the CLS method based on the separation principle,reactant selection,and case analysis,for example,the separation of alkenes,alkane,aromatics,and polyol products.In summary,we provide guidance and references for chemical separation process intensification in product refining and separation from azeotropic systems for the development of a more sustainable chemical industry.

关键词： Chemical-looping Azeotropes Reactive distillation Reactants screening Process intensification

Design and optimization of reactive distillation: a review

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Frontiers of Chemical Science and Engineering 2022年第6期16卷 799-818页

作者： Chang Shu xingang Li Hong Li Xin Gao School of Chemical Engineering and Technology National Engineering Research Center of Distillation TechnologyCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin 300072China

Reactive distillation process,a representative process intensification technology,has been widely applied in the chemical industry.However,due to the strong interaction between reaction and separation,the extension of reactive distillation technology is restricted by the difficulties in process analysis and design.To overcome this problem,the design and optimization of reactive distillation have been widely studied and illustrated for plenty of reactive mixtures over the past three decades.These design and optimization methods of the reactive distillation process are classified into three categories:graphical,optimization-based,and evolutionary/heuristic methods.The primary objective of this article is to provide an up-to-date review of the existing design and optimization methods.Desired and output information,advantages and limitations of each method are stated,the modification and development for original methodologies are also reviewed.Perspectives on future research on the design and optimization of reactive distillation method are proposed for further research.

关键词： reactive distillation process intensification design method reactive phase diagram optimization algorithm

A generalized CFD model for evaluating catalytic separation process in structured porous materials

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Chinese Journal of Chemical Engineering 2022年第11期51卷 168-177页

作者： Anshi Hong Zisheng Zhang xingang Li Xin Gao School of Chemical Engineering and Technology National Engineering Research Center of Distillation TechnologyCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin 300072China Department of Chemical and Biological Engineering University of OttawaOttawa K1N 6N5Canada

A hybrid multiphase model is developed to simulate the simultaneous momentum, heat and mass transfer and heterogeneous catalyzed reaction in structured catalytic porous materials. The approach relies on the combination of the volume of fluid(VOF) and Eulerian–Eulerian models, and several plug-in field functions. The VOF method is used to capture the gas–liquid interface motion, and the Eulerian–Eulerian framework solves the temperature and chemical species concentration equations for each phase.The self-defined field functions utilize a single-domain approach to overcome convergence difficulty when applying the hybrid multiphase for a multi-domain problem. The method is then applied to investigate selective removal of specific species in multicomponent reactive evaporation process. The results show that the coupling of catalytic reaction and interface species mass transfer at the phase interface is conditional, and the coupling of catalytic reaction and momentum transfer across fluid–porous interface significantly affects the conversion rate of reactants. Based on the numerical results, a strategy is proposed for matching solid catalyst with operating condition in catalytic distillation application.

关键词： CFD(computational fluid dynamics) Hybrid multiphase model SiC foam Mass transfer Catalytic distillation

Carrier-free supramolecular nanomedicines assembled by small-molecule therapeutics for cancer treatment

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Chinese Chemical Letters 2023年第5期34卷 121-131页

作者： Jianhui Zuo Xin Gao Jianru Xiao Yiyun Cheng Department of Thoracic Surgery The First Affiliated Hospital of Anhui Medical UniversityHefei 230022China Shanghai Changzheng Hospital Joint Research Center for Orthopedic Oncology East China Normal UniversityShanghai 200241China Department of Orthopedics Oncology Changzheng HospitalNavy Medical UniversityShanghai 200003China

Nanomedicines have shown great promise in cancer therapy,but are challenged by limited drug loading,safety concerns of drug carriers,and complexity of function integration.Recently,carrier-free nanomedicines produced by supramolecular assembly of small-molecule therapeutic functionalities and their conjugates were proposed to address these issues.These nanomedicines achieve very high drug loading,enhanced tumor accumulation and improved therapeutic efficiency,and avoid carrier-related safety problems.In this review article,the applications of these nanomedicines in chemotherapy,photodynamic therapy,photothermal therapy as well as combination therapies will be reviewed.The concept of nanomedicine design and mechanism of supramolecular assembly will be discussed.Finally,future perspectives of carrier-free supramolecular nanomedicines for cancer therapy will be highlighted.

关键词： Nanomedicine Carrier-free Cancer therapy Supramolecular assembly Combination therapy

New horizons for selenium in animal nutrition and functional foods

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Animal Nutrition 2022年第4期11卷 80-86页

作者： xin Gu Chun-qi gao Guangdong Provincial Key Laboratory of Animal Nutrition Control/Key Laboratory of Chicken Genetics Breeding and ReproductionMinistry of AgricultureCollege of Animal ScienceSouth China Agricultural University GuangdongChina College of Animal SciencesZhejiang UniversityHangzhouChina

Selenium(Se),one of the indispensable nutrients for both human health and animal growth,participates in various physiological functions,such as antioxidant and immune responses and metabolism.The role of dietary Se,in its organic and inorganic forms,has been well documented in domestic animals.Furthermore,many feeding strategies for different animals have been developed to increase the Se concentration in animal products to address Se deficiency and even as a potential nutritional strategy to treat free radical-associated diseases.Nevertheless,studies on investigating the optimum addition of Se in feed,the long-term consequences of Se usage in food for animal nutrition,the mechanism of metallic Se nanoparticle(SeNP)transformation in vivo,and the nutritional effects of SeNPs on feed workers and the environment are urgently needed.Starting from the absorption and metabolism mechanism of Se,this review discusses the antioxidant role of Se in detail.Based on this characteristic,we further investigated the application of Se in animal health and described some unresolved issues and unanswered questions warranting further investigation.This review is expected to provide a theoretical reference for improving the quality of food animal meat as well as for the development of Se-based biological nutrition enhancement technology.

关键词： Selenium Antioxidant Meat quality Functional foods

Special issue on computational biology and bioinformatic applications to the COVID-19 pandemic

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Quantitative Biology 2022年第2期10卷 123-124页

作者： Francesco Napolitano Xin Gao Computational Bioscience Research Center(CBRC) King Abdullah University of Science and Technology(KAUST)Thuwal 23955Saudi Arabia Department of Science and Technology(DST) University of Sannio82100BeneventoItaly

The COVID-19 pandemic has caused a global crisis that prompted the scientific community to tackle new,extraordinary challenges.The urge to make informed decisions with dramatic impact on public health,wealth and society as a whole has pushed the scientific community to produce knowledge and tools at an unprecedented pace.This massive effort resulted in a deep understanding of the SARS-CoV-2 infection,spread and pathogenetic mechanisms,together with the assessment of non-pharmaceutical interventions(NPIs),and the development of therapies and vaccines.We argue that a remarkable contribution to the fight against the pandemic has been provided by the availability of computational biology and bioinformatics tools,which contributed to boost the research process in any possible application area and better cope with the urgent needs determined by the pandemic.

关键词： boost prompt massive

The role of single deformed bubble on porous foam tray with submerged orifices on the mass transfer enhancement

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Frontiers of Chemical Science and Engineering 2023年第12期17卷 2127-2143页

作者： Peng Yan Xueli Geng Jian Na Hong Li Xin Gao School of Chemical Engineering and Technology National Engineering Research Center of Distillation TechnologyCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin 300350China College of Petrochemical Technology Lanzhou University of TechnologyLanzhou 730050China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Foam trays with porous submerged orifices endow bubbles uniformly distributed,which are considered attractive column internals to enhance the gas-liquid mass transfer process.However,its irregular orifice and complex gas-liquid flow make it lack pore-scale investigations concerning the transfer mechanism of dynamic bubbling.In this work,the actual porous structure of the foam tray is obtained based on micro computed tomography technology.The shape,dynamic,and mass transfer of rising bubbles at porous orifices are investigated using the volume of fluid and continue surface force model.The results demonstrate that the liquid encroaching on the gas channels causes the increasing orifices velocity,which makes the trailing bubble easily detach from the midst of the leading bubble and causes pairing coalescence.Additionally,we found that the central breakup regimes significantly improve the gas-liquid interface area and mass transfer efficiency.This discovery exemplifies the mechanism of mass transfer intensification for foam trays and serves to promote its further development.

关键词： bubble formation porous submerged orifices process intensification foam tray

Experimental Study on the Reduction Effect of Pit Texture on Disassembly Damage for Interference Fit

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Chinese Journal of Mechanical Engineering 2023年第2期36卷 249-260页

作者： Dan Zhou Yi Xu Xin Gao Haihong Huang Songjiang Lv Key Laboratory of Green Design and Manufacturing in Machinery Industry Hefei University of TechnologyHefei 230009China CRRC Nanjing Puzhen Co.Ltd Nanjing 210031China

After remanufacturing disassembly,several kinds of friction damages can be found on the mating surface of interference fit.These damages should be repaired and the cost is closely related to the severity of damages.Inspired by the excellent performance of surface texture in wear reduction,5 shapes of pit array textures are added to the specimens’surface to study their reduction effect of disassembly damage for interference fit.The results of disassembly experiments show that the order of influence of texture parameters on disassembly damage is as follows:equivalent circle diameter of single texture,texture shape and texture surface density.The influence of equivalent circle diameter of single texture and texture shape are obviously more significant than that of texture surface density.The circular texture with a surface density of 30%and a diameter of 100μm shows an excellent disassembly damage reduction effect because of its perfect ability of abrasive particle collection.And the probability of disassembly damage formation and evolution is also relatively small on this kind of textured surface.Besides,the load-carrying capacity of interference fit with the excellent texture is confirmed by load-carrying capacity experiments.The results show that the load-carrying capacity of the excellent texture surface is increased about 40%compared with that of without texture.This research provides a potential approach to reduce disassembly damage for interference fit.

关键词： Remanufacturing Interference fit Disassembly damage Surface texture Load-carrying capacity