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adsorption/desorption of Low-density Lipoprotein on a Heparinized Surface of Gold Sensors

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Chemical Research in Chinese Universities 2012年第2期28卷 323-328页

作者： LAN Ping JI Jing HUANG Xiao-Jun GUDURU Deepak GROTH Thomas VIENKEN Jorg D1NG Hui College of Materials and Textiles Jiaxing UniversityJiaxing 314001P.R.China Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of EducationDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027P.R.China Biomedical Materials Group Department of Pharmaceutics and BiopharmaeeuticsInstitute of PharmacyMartin Luther University Halle-WittenbergHalle(Saale)06120Germany Fresenius Medical Care of Deutschland GmbH BioSciences DepartmentBad Homburg 61352Germany College of Mathematics Physics and Information Engineering Jiaxing UniversityJiaxing 314001P.R.China

Heparin has been considered to be a potentially useful ligand for low-density lipoprotein（LDL） detection and analysis in a clinical *** order to construct an affinity surface for preferential adsorption of LDL,heparin-modified gold surface（GS-Hep） was fabricated by a self-assembling method and hydrophobic-modified gold surfaces（GS-Hydro） was used as a *** morphologies of the modified gold surfaces were investigated by atomic force microscopy（AFM） and the quantity of heparin bound to gold surface was assayed by the toluidine blue（TB） colorimetric *** contact angles were determined to investigate wettability on GS-Hep and *** plasmon resonance（SPR） technique was used subsequently to detect the selective binding of LDL with *** the investigation on the effect of pH on LDL adsorption suggests that lower pH lead to higher quantities of LDL adsorption on *** with GS-Hydro,GS-Hep is selective for LDL from both single and binary protein ***,adsorbed LDL on GS-Hep could be washed off by injecting elution solution,such as NaCl solution,for the purpose of the regeneration of GS-Hep for further LDL adsorption.

关键词： adsorption/desorption Low-density lipoprotein(LDL) Heparinized surface Surface plasmon resonance

Review of Molecular Simulation Method for Gas adsorption/desorption and Diffusion in Shale Matrix

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Journal of Thermal Science 2019年第1期28卷 1-16页

作者： WANG Hui QU Zhiguo YIN Ying BAI Junqiang YU Bo School of Aeronautics Northwestern Polytechnical University MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power Engineering Xi'an Jiaotong University Mechanical Engineering College Beijing Institute of Petrochemical Technology

Shale gas is becoming an increasingly promising alternative energy resource because of its high efficiency and environment-friendly characteristic. The amount of adsorbed gas on the shale matrix surfaces and dissolved gas in the shale matrix bulk is the dominant factor in the long-term productivity of shale reservoir. Although experimental measurements have been extensively carried out to investigate the gas adsorption and diffusion properties in the shale matrix, they cannot provide the detailed information on the microscopic transport mechanism of shale gas during the gas production process. Molecular simulation can accurately visualize the gas adsorption/desorption and diffusion processes in the shale matrix. In the present study, the recent research advances of molecular simulation on gas adsorption/desorption and diffusion in the shale matrix are reviewed. Firstly, the density functional theory(DFT) for shale gas molecule desorption/adsorption on the surface of the matrix crystal is illustrated. Then, the grand canonical Monte Carlo(GCMC) method predicting the amount of shale gas desorption/adsorption in the shale matrix crystal is introduced. Finally, molecular dynamics simulation(MD) for gas diffusion in the shale matrix is elucidated. Further developments of the molecular simulation method in shale gas production are also discussed.

关键词： shale gas molecular simulation adsorption/desorption diffusion

Mechanism model for shale gas transport considering diffusion, adsorption/desorption and Darcy flow

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Journal of Central South University 2013年第7期20卷 1928-1937页

作者： WEI Ming-qiang DUAN Yong-gang FANG Quan-tang WANG Rong YU Bo-ming YU Chun-sheng State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University) Chengdu 610500 China School of Physics Huazhong University of Science and Technology Wuhan 430074 China

To improve the understanding of the transport mechanism in shale gas reservoirs and build a theoretical basic for further researches on productivity evaluation and efficient exploitation, various gas transport mechanisms within a shale gas reservoir exploited by a horizontal well were thoroughly investigated, which took diffusion, adsorption/desorption and Darcy flow into account. The characteristics of diffusion in nano-scale pores in matrix and desorption on the matrix surface were both considered in the improved differential equations for seepage flow. By integrating the Langmuir isotherm desorption items into the new total dimensionless compression coefficient in matrix, the transport function and seepage flow could be formalized, simplified and consistent with the conventional form of diffusion equation. Furthermore, by utilizing the Laplace change and Sethfest inversion changes, the calculated results were obtained and further discussions indicated that transfer mechanisms were influenced by diffusion, adsorption/desorption. The research shows that when the matrix permeability is closed to magnitude of 10^-9D, the matrix flow only occurs near the surfacial matrix; as to the actual production, the central matrix blocks are barely involved in the production; the closer to the surface of matrix, the lower the pressure is and the more obvious the diffusion effect is; the behavior of adsorption/desorption can increase the matrix flow rate significantly and slow down the pressure of horizontal well obviously.

关键词： shale gas diffusion adsorption/desorption transport mechanism horizontal well

Determination of Energetic and Geometric Properties of Plant Roots Specific Surface from adsorption/desorption Ishoterm

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American Journal of Plant Sciences 2013年第8期4卷 1554-1561页

作者： Grzegorz Jozefaciuk Malgorzata Lukowska Justyna Szerement Institute of Agrophysics of Polish Academy of Sciences Lublin Poland.

Background and Aims: Structure and composition of plant roots surfaces are extremely complicated. Water vapor adsorption/desorption isotherm is a powerful tool to characterize such surfaces. The aim of this paper is to present theoretical approach for calculating roots surface parameters as adsorption energy, distribution of surface adsorption centers, as well as roots geometric and structure parameters as surface fractal dimension, nanopore sizes and size distributions on example of experimental isotherms of roots of barley taken from the literature. This approach was up to date practically not applied to study plant roots. Methods: Simplest tools of theoretical analysis of adsorption/desorption isotherms are applied. Results: Parameters characterizing energy of water binding, surface complexity and nanopore system of the studied roots were calculated and compared to these of the soils. Some possible applications of root surface parameters to study plant-soil interactions are outlined. Conclusions: Physicochemical surface parameters may be important for characterizing root surface properties, their changes in stress conditions, as well as for study and model plant processes. Physicochemical and geometrical properties of plant roots differ from these of the soils.

关键词： adsorption Energy adsorption/desorption Isotherm Fractal Dimension Nanopore Plant Roots

Experimental research on adsorption/desorption for petroleum pollutants in the soil in Daqing oilfield

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Acta Geochimica 2006年第S1期 260-260页

作者： Xiaoyan LIU1, Yingli LI1, Guocheng MAO2, Jungang LI1, Chun LI1, Jingxin SUN1, Qianya ZHU1 1 Geoscience College, Daqing Petroleum Institute, Daqing 163310, China 2 Security and Environment Protection Department, Daqing Petroleum Administrative Bureau, Daqing 163453, China

Numerical research for contaminant release from un-suspended bottom sediment under different hydrodynamic conditions

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Journal of Hydrodynamics 2013年第4期25卷 620-627页

作者：程鹏达朱红伟樊靖郁费敏锐王道增 School of Mechatronical Engineering and Automation Shanghai University Shanghai Institute of Applied Mathematics and Mechanics Shanghai University

Contaminant release from bottom sediments in rivers is one of the＂ main problems to study the environmental hydrodyna- mics. Contaminant will release into the overlying water column under different hydrodynamic conditions through pore-water in sedi- ment, the release mechanism can be roughly divided into convection diffusion, molecular diffusion and adsorption/desorption. In this article, phosphorus was as a typical contaminant with sorption. Through theoretical analysis of the contaminant release, according to different particle-sized and hydraulic conditions, the mathematics model of contaminant release can be established by the coupled Navier-Stokes equation, Darcy equation, solute transport equation and adsorption/desorption equation. Then that model was verified by flume experiment. Numerical studies show that, under different velocity, the instantaneous concentration of convection diffusion is about 6 times to 50 times larger than that of molecular diffusion during initial stages. The concentration of molecular diffusion is about 1 times to 4 times larger than to that of convection diffusion during late stages. Through analysis, the diffusive boundary layer near the interface can be obtained. In addition, the release will increase with particle size decreasing, and the release will be influe- nced much more by the size change when the particle size is relatively big under different velocity.

关键词： sediment contaminant instantaneous release coupling adsorption/desorption

Current research into the use of supercritical CO2 technology in shale gas exploitation

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International Journal of Mining Science and Technology 2019年第5期29卷 739-744页

作者： Wang Meng Huang Kai Xie Weidong Dai Xuguang School of Resources and Earth Science China University of Mining&TechnologyXuzhou 221116China Key Laboratory of Coalbed Methane Resource&Reservoir Formation Process Ministry of EducationChina University of Mining&TechnologyXuzhou 221008China College of Geology and Mining Engineering Xinjiang UniversityUrumqi 830046China

The use of supercritical CO2 for shale gas extraction is a promising new *** paper explores current research into this process,looking at analysis of the mechanism of CH4 displacement in nanoporous shale,the positive and negative effects accompanying its use for sequestration as well as organic extraction,the migration of elements and the swelling process,and the macro and micro control mechanisms involved in permeability enhancement in *** directions for future research are also considered through comparison with hydraulic *** research findings indicate that ScCO2 fluid replacement can be used to increase gas production and seal up greenhouse gases as an effective,clean and safe method of shale gas *** is particularly effective for promoting the desorption of CH4 in shale reservoirs that have developed fine neck-wide body pores,and the subtle structural changes effected by ScCO2 fluid in sensitive minerals in reservoirs with a high brittle mineral content also have a positive effect on permeability and storage *** adsorption process has been characterized as consisting of three stages:short-term shrinkage,slow swelling,and stability;an expansion equation has been proposed for CO2/CH4 that incorporates competitive adsorption,collision desorption,and impingement ***2 fracturing has been found to be more effective than hydraulic fracturing for dense reservoirs and more effective at linking up pore-micro-fissure-fracture systems.

关键词： Shale gas Supercritical CO2 adsorption/desorption Physical properties Geological sequestration

Sequestration of organic contaminants in soil/sediment and its impact on contaminant fate

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Acta Geochimica 2006年第S1期 262-263页

作者： Mason B. Tomson Department of Civil and Environmental Engineering Rice University

Two Ways of Denaturation Leading to Different Transition States of Fibrinogen

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Tsinghua Science and Technology 1997年第1期2卷 69-73页

作者：赵南明公衍道李菲张秀芳 Department of Biological Science and Biotechnology State Key Laboratory of Biomembrane and Membrane Biotechnology Tsinghua University Beijing 100084

HFG (human fibrinogen) desorbed from a PTFE (polytetrafluoroethylene) surface and thermally denatured HFG were conformationally studied by using FTIR (Fourier transform infrared) spectroscopy. It is shown that some irreversible conformational changes of HFG, including a decrease in the α helix content and an increase in the β structure content, were induced by the PTFE surface adsorption/*** suggests that some α helix structures should transform into β *** HFG was thermally denatured as well as the native HFG under a thermal incubation of 30 min at 73 ℃ .After the same thermal treatment, the α helix content in the thermally denatured desorbed HFG was obviously less than that in the former native HFG.

关键词： human fibrinogen (HFG) polytetrafluoroethylene (PTFE) thermal denaturation adsorption/desorption