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Growth and aggregation of Cu nanocrystals on ionic liquid surfaces

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Chinese Physics B 2020年第6期29卷 394-398页

作者： Jia-Wei Shen Xun-Heng ye Zhi-Long Bao Lu Li Bo Yang Xiang-Ming Tao gao-Xiang ye Department of Physics Zhejiang UniversityHangzhou 310027China

We report a catalyst-free growth of Cu nanocrystals on ionic liquid surfaces by thermal evaporation method at room *** deposition of Cu on ionic liquid surfaces,ramified Cu aggregates *** is found that the aggregates are composed of both granules and nanocrystals with triangular or hexagonal *** sizes of the nanocrystals are in the range of tens to hundreds of nanometers and increase with the nominal deposition *** growth mechanism of the Cu aggregates and nanocrystals is presented.

关键词： ramified aggregates Cu nanocrystals liquid substrates critical state

Nucleation, Growth, and Aggregation of Au Nanocrystals on Liquid Surfaces

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Chinese Physics Letters 2020年第2期37卷 74-77页

作者： Lu Li Zhi-Long Bao Xun-Heng ye Jia-Wei Shen Bo Yang gao-Xiang ye Xiang-Ming Tao Department of Physics Zhejiang UniversityHangzhou 310027

We report the formation of gold ramified aggregates after deposition of Au on an ionic liquid surface by thermal evaporation method at room *** is observed that the aggregates are composed of both granules and nanocrystals with hexagonal or triangular *** most probable size of the nanocrystals is much larger than that of the granules and it increases with the nominal deposition *** formation mechanism of the granules,nanocrystals and aggregates is presented.

关键词： temperature. nominal hexagonal

Theoretical and experimental investigation on vertical tank technology for sinter waste heat recovery

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Journal of Central South University 2017年第10期24卷 2281-2287页

作者： FENG Jun-sheng DONG Hui gao Jian-ye LIU Jing-yu LIANG Kai State Environmental Protection Key Laboratory on Eco-industry Northeastern UniversityShenyang 110819China

In the present work, the gas flow pressure drop and gas–solid heat transfer characteristics in sinter bed layer of vertical tank were studied experimentally on the basis of the homemade experimental setup. The gas flow pressure drop through the sinter bed layer was measured with different gas velocity and particle diameters, as well as the sinter and air temperatures. The influences of gas superficial velocity and particle diameter on the gas flow pressure drop and gas solid heat transfer in sinter bed layer were analyzed in detail. The revised Ergun's correlation and gas solid heat transfer correlation were obtained according to the regression analysis of experimental data. It is found that, the pressure drop of unit bed layer height gradually increases as a quadratic relationship with increasing the gas superficial velocity, and decreases as an exponential relationship with the increase of sinter particle diameter. For a given sinter temperature, the heat transfer coefficient in sinter bed layer increases with increasing the gas superficial velocity, and increases with decreasing the sinter particle diameter. In addition, the heat transfer coefficient also gradually increases with increasing the sinter temperature at the same gas superficial velocity and sinter particle diameter. The mean deviations between the experimental data obtained from this work and the values calculated by the revised Ergun's correlation and the experimental heat transfer correlation are 7.22% and 4.22% respectively, showing good prediction.

关键词： sinter waste heat pressure drop heat transfer coefficient experimental study

Microstructure and Properties of 7075Al Alloy Fabricated by Directly Combined of Spray Forming and Continuous Extrusion Forming under Different Atomization Gas Pressures

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Acta Metallurgica Sinica(English Letters) 2016年第9期29卷 804-812页

作者： ye-gao Chen Yi Zhong Jiang-Cheng Yin Li-Qiang Wang Li-Na Liu Huan Yang Ying-Li Liu Faculty of Materials Science and Engineering Kunming University of Science and Technology

A new process consisting of the spray forming and the continuous extrusion forming for manufacturing 7075A1 alloy was proposed. The microstructure evolution, mechanical properties and the resistance to stress corrosion cracking of the alloy were studied. The results indicate that the spray forming process induces obviously grain refinement and greatly lower segregation microstructure. Besides, the Conform process produces finer grains and conduces to more uniform distribution of the precipitates of A1Cu and MgZn2 phases. The fabricated alloy shows good comprehensive mechanical properties and superb performance of stress corrosion resistance. Moreover, a better combination of the mechanical properties and the resistance to stress corrosion cracking could then be obtained under a certain condition of atomization gas pressure of 0.19 MPa. The enhanced properties are attributed to the following factors, which include the grain refinement, the fine and homogeneous distribution of A1Cu and MgZn2 phases, the high density of the extruded products, as well as the discontinuous distribution of the grain boundaries after retrogression and reaging （RRA） heat treatment.

关键词： 7075A1 alloy Spray forming Continuous extrusion forming Microstructure Property

Pore structure and tracer migration behavior of typical American and Chinese shales

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Petroleum Science 2015年第4期12卷 651-663页

作者： Qin-Hong Hu Xian-Guo Liu Zhi-ye gao Shu-Gen Liu Wen Zhou Wen-Xuan Hu China University of Geosciences (Wuhan) The University of Texas at Arlington State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Nanjing University

With estimated shale gas resources greater than those of US and Canada combined, China has been embarking on an ambitious shale development program. However, nearly 30 years of American experience in shale hydrocarbon exploration and production indicates a low total recovery of shale gas at 12 %-30 % and tight oil at 5 %-10 %. One of the main barriers to sustainable devel- opment of shale resources, namely the pore structure （ge- ometry and connectivity） of the nanopores for storing and transporting hydrocarbons, is rarely investigated. In this study, we collected samples from a variety of leading hydrocarbon-producing shale formations in US and China. These formations have different ages and geologic char- acteristics （e.g., porosity, permeability, mineralogy, total organic content, and thermal maturation）. We studied their pore structure characteristics, imbibition and saturated diffusion, edge-accessible porosity, and wettability with four complementary tests： mercury intrusion porosimetry, fluid and tracer imbibition into initially dry shale, tracer diffusion into fluid-saturated shale, and high-pressure Wood＇s metal intrusion followed with imaging and ele- mental mapping. The imbibition and diffusion tests use tracer-bearing wettability fluids （API brine or n-decane） to examine the association of tracers with mineral or organic matter phases, using a sensitive and micro-scale elemental laser ablation ICP-MS mapping technique. For two molecular tracers in n-decane fluid with the estimated sizes of 1.39 nm x 0.29 nm x 0.18 nm for 1-iododecane and 1.27 nm ~ 0.92 nm ~ 0.78 nm for trichlorooxobis （triph- enylphosphine） rhenium, much less penetration was observed for larger molecules of organic rhenium in shales with median pore-throat sizes of several nanometers. This indicates the probable entanglement of sub-nano-sized molecules in shales with nano-sized pore-throats. Overall findings from the above innovative approaches indicate the limited accessibility （several

关键词： Shale - Nanopore - Connectivity - Diffusion Imbibition

Effects of deep alkaline and acidic fluids on reservoir developed in fault belt of saline lacustrine basin

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Petroleum Science 2023年第2期20卷 776-786页

作者： Lei-Lei Yang Xin-Wei Li Guo Wei Yi-Dan Liu Qin-Gong Zhuo Zhi-Chao Yu Zhi-ye gao State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum(Beijing)Beijing102249China The Unconventional Petroleum Research Institute China University of Petroleum(Beijing)Beijing102249China Jilin Oilfield Company Jilin130062China PetroChina Exploration and Development Research Institute Beijing100083China

Through the long development processes of reservoir sedimentation and diagenesis, acidic and alkaline fluids play key roles in controlling deep reservoir development. However, the ways in which deep fluids control and transform the reservoir under complex fault conditions remain unclear. In this study, a 2D model was established based on a typical sub-salt to intra-salt vertical profile in the Qaidam Basin, China. Based on measured data, multiphase flow reaction and solute transport simulation technology were used to analyze fluids flow and migration in the intra-salt and sub-salt reservoirs, determine the mineral dissolution, precipitation, and transformation in the reservoir caused by the deep fluids, and calculate the changes in reservoir porosity. Results show that deep fluid migrates preferentially along dominant channels and triggers a series of fluid–rock chemical reactions. In the first stage, a large amount of anhydrite precipitated in the fault as a result of upward migration of deep saline fluid, resulting in the formation of anhydrite veins and blockage at the base of the fault. In the second stage, organic acids caused minerals dissolution and a vertical channel was opened in previously blocked area, which promoted continuous upward migration of organic acids and the formation of secondary pores. This study clarifies the transformative effects of deep alkaline and acidic fluids on the reservoir. Moreover, the important fluid transport role of faults and their effect on reservoir development were determined.

关键词： Saline lacustrine basin Alkaline and acidic fluids Fault-belt reservoir Mineral transformation Physical conditions

Polyrotaxane-based triblock copolymers synthesized via ATRP of N-isopropylacrylamide initiated from the terminals of polypseudorotaxane of Br end-capped pluronic 17R4 and β-cyclodextrins

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Science China Chemistry 2012年第6期55卷 1115-1124页

作者： LI Shuo WANG Jin gao Peng ye Lin ZHANG AiYing FENG Zeng-Guo School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China

Thermo-responsive polyrotaxane （PR）-based triblock copolymers were synthesized via the atom transfer radical polymeriza- tion （ATRP） of N-isopropylacrylamide initiated with self-assemblies made from a distal 2-bromoisobutyryl end-capped Plu- ronic 17R4 （PPOI4-PEG24-PPOI4） with a varying amount of β-cyclodextrins （β-CDs） in the presence of Cu（I）C1/PMDETA at 25 ~C in aqueous solution. The molecular structure was characterized by means of ~H NMR, FTIR, WXRD, GPC, TGA and DSC analyses. About half of [3-CDs are still entrapped on the Pluronic 17R4 chain while the number of incorporated NIPAAm monomers is nearly a double feed value in the resulting copolymers. The aggregate morphologies in aqueous solution were evidenced by TEM observations. A two-step thermo-responsive transition arising from a combination of a polypseudorotaxane middle block with poly（N-isopropylacrylamide） flanking blocks was also demonstrated by turbidity measurements. Given their thermo-responsive behavior in aqueous solution, these PR-based triblock copolymers show the potential to be used as smart materials for the controlled drug delivery systems, biosensors, and the like.

关键词： β-cyclodextrin polyrotaxane ATRP poly(N-isopropylacrylamide)

THE DETERMINATION OF GLUCOSE IN URINE BY USING CYCLIC VOLTAMMETRY

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Chinese Chemical Letters 1995年第2期6卷 131-134页

作者： Zheng Yu ZHOU Can Zhu gao Qing Cun ZHU Fu ye gao Fan Zhen KONG (Chemistry Department, Qufu Normal University, Qufu Qufu Normal Univ Dept Chem Qufu 273165 Peoples R China

It has been found that the peak current in KRPB solution is of good linear dependence on the concentration of glucose. According to this relation, the standard curve is plotted and the results of determination of glucose concentration have been presented in the urine of diabetes mellitus. The interference from endogenous oxidizable substances such as uric acid, urea, as well as the effect of chloride on,glucose response are also studied.

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Bioconjugated Nanomaterial for Targeted Diagnosis of SARS-CoV‑2

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Accounts of Materials Research 2022年第2期3卷 134-148页

作者： Avijit Pramanik ye gao Shamily Patibandla Kalein Gates Paresh Chandra Ray Department of Chemistry and Biochemistry Jackson State UniversityJacksonMississippi 39217United States

CONSPECTUS:Infectious diseases by pathogenic microorganisms are one of the leading causes of mortality *** and socio-economic development have been seriously affected for different civilizations because of bacterial and viral *** to the Centers for Disease Control and Prevention(CDC),pandemic in 1918 by the Influenza A virus of the H1N1 subtype was responsible for 50 to 100 million deaths ***,the Asian flu pandemic in 1957,Hong Kong flu in 1968,and H1N1pdm09 flu pandemic in 2009 were responsible for more than 1 million deaths across the globe each *** per the World Health Organization(WHO),the current pandemic by coronavirus disease 2019(COVID-19)due to the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)virus is responsible for more than 4.8 M death worldwide until *** the gold standard polymerase chain reaction(PCR)test is more time-consuming,the health care system cannot test all symptomatic and asymptomatic Covid patients every day,which is extremely important to tackle the *** of the significant challenges during the current pandemic is developing mass testing tools,which is critical to control the virus spread in the ***,it is highly desirable to develop advanced material-based approaches that can provide a rapid and accurate diagnosis of COVID-19,which will have the capability to save millions of human lives.

关键词： diagnosis consuming deaths