Xem 1-20 trên 20 kết quả Desorption
  • Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: Adsorption and desorption characteristics of arsenic onto ceria nanoparticles

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Adsorption and desorption characteristics of arsenic onto ceria nanoparticles Nanoscale Researc

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  • Hấp phụ và giải hấp ion chì (II) từ dung dịch nước bởi gamma – MnO₂ cấu trúc nano. Trong công trình này, các tác giả đã nghiên cứu sự hấp phụ và giải hấp phụ Pb (II) từ dung dịch nước bởi vật liệu gamma – MnO2 cấu trúc nano. Các yếu tố ảnh hưởng đến quá trình hấp phụ như pH, thời gian khuấy và nồng độ đầu đã được nghiên cứu. Động học và cân bằng hấp phụ đạt được từ các thí nghiệm.

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  • Các nhà khoa học Mỹ khẳng định cảnh sát có thể phát hiện dấu vết của heroin, cocaine, cần sa và thậm chí thuốc nổ trên một dấu vân tay. Một nhóm chuyên gia tại đại học Purdue, West Lafayette, bang Indiana (Mỹ) đã sử dụng một kỹ thuật có tên DESI (desorption electrospray ionization), theo đó người ta phun một hợp chất hóa học hòa tan lên bề mặt dấu vân tay rồi phân tích các giọt dung dịch nằm rải rác trên dấu vân bằng phương pháp quang phổ học....

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  • Characterizing the nature of heavy metal release reactions, sorption mechanisms, and movement in the soil is the main topic of this book. Because soils are heterogeneous, heavy metals in soils can be involved in a series of complex chemical and biological interactions including oxidation-reduction, precipitation and dissolution, volatilization, and surface and solution phase complexation. The heterogeneous nature of the different soil constituents adds to the complexity of interactions of heavy metal species with the soil environment....

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  • Experimental Determinations of Surface Structure Low-Energy Electron Diffraction • High-Resolution Electron Microscopy • Field Ion Microscopy Chemical Analysis of Surfaces Auger Electron Spectroscopy • X-Ray Photoelectron Spectroscopy • Secondary Ion Mass Spectroscopy • Infrared Spectroscopy • Thermal Desorption

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  • ● Adsorption chromatography • The stationary phase is an adsorbent (like silica gel or any other silica-based packing) • The separation is based on repeated adsorption-desorption steps. ● Normal-phase chromatography • The stationary bed is strongly polar in nature (e.g., silica gel), and the mobile phase is nonpolar (such as n-hexane or tetrahydrofuran). • Polar samples are retained on the polar surface of the column packing longer than less polar materials.

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  • Ferrante, J. et. al. “Surface Physics in Tribology” Handbook of Micro/Nanotribology. Ed. Bharat Bhushan Boca Raton: CRC Press LLC, 1999 © 1999 by CRC Press LLC Surface Physics in Tribology John Ferrante and Phillip B. Abel 3.1 3.2 3.3 3.4 3.

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  • Toxic heavy metals, i.e. copper (II), lead (II) and cadmium (II), can be removed from water by metallurgical solid wastes, i.e. bauxite waste red muds and coal fly ashes acting as sorbents. These heavy-metal-loaded solid wastes may then be solidified by adding cement to a durable concrete mass assuring their safe disposal. Thus, toxic metals in water have been removed by sorption on to inexpensive solid waste materials as a preliminary operation of ultimate fixation. Metal uptake (sorption) and release (desorption) have been investigated by thermostatic batch experiments.

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  • Porcine reproductive and respiratory syndrome (PRRS) is one of the most significant swine diseases worldwide. Despite its relevance, serum biomarkers associated with early-onset viral infection, when clinical signs are not detectable and the disease is characterized by a weak anti-viral response and persistent infection, have not yet been identified. Surface-enhanced laser desorption ionization time of flight mass spectrometry (SELDI-TOF MS) is a reproducible, accurate, and simple method for the identification of biomarker proteins related to disease in serum.

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  • In this work, platinum nanoparticles were dispersed on SBA-15 mesoporous material by incipient wetness method and the synthesized materials were characterized by XRD, TEM, EDX spectroscopies and N2 adsorption-desorption isotherm measurement. The results indicated that 2D hexagonal ordered structure of SBA-15 was still maintained after grafting Pt on SBA-15 support and platinum nanoparticles existed both inside and outside the pore channels of SBA-15 material. Catalytic activity of these materials was tested in the aqueous phase D-glucose oxidation as a model reaction. ...

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  • Two FCC catalysts with a 60m average size, prepared with different crystallite sizes (0.4 and 0.9m), are studied in terms of total acidity, energy of ammonia desorption, specific surface area, relative amount of Brönsted and Lewis acid sites, crystallite and particle size, and micropore size distribution.

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  • Catalytic oxidation of m-xylene was carried out over the copper oxide catalyst loaded on SiO2 300 m2/g. The various techniques were used to characterize the catalysts x-ray diffraction, TPRH2, N2 adsorption-desorption, scanning electron microscopy (SEM), tranmission electron microscopy (TEM) and CO pulse chemisorptions. The results indicate that the impregnated solution concentration exerts an influence on the catalytic activity.

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  • Mesoporous molecular sieve Al-Si-MCM41 was synthesized by using hexadecyltrimetylammonium bromide (C9H42BrN) as surfactant at room temperature. The material characterization was studied by IR, XRD, HR-TEM, nitrogen desorption-absorption isotherms BET and TPD-NH3 methods.

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  • Saccharomyces cerevisiaepossesses two glycogenin isoforms (designated as Glg1p and Glg2p) that both contain a con-served tyrosine residue, Tyr232. However, Glg2p possesses an additional tyrosine residue, Tyr230 and therefore two potential autoglucosylation sites. Glucosylation of Glg2p was studied using both matrix-assisted laser desorption ionization and electrospray quadrupole time of flight mass spectrometry. Glg2p, carrying a C-terminal (His6) tag, was produced inEscherichia coliand purified.

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  • In 1998, it was first reported that a silica material with large, uniform mesopores arranged into a two-demensional hexagonal structure is synthesized using triblock copolymer and oligomer templates poly (ethylene oxide), (EO)n. This silica was denoted SBA-15. Up to now, it is believed that ordered mesopores of SBA-15 are connected through complementary pores (microporores and small mesopores) in the siliceous pore walls. SBA-15 can be readily synthesized using cheap materials and it shows attractive structural properties, very good hydrothemal stability.

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  • Nanoparticle of Perovskite La1-xSrxCoO3 (x = 0, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7) were prepared by using citric acid sol-gel method. The structure and morphology of products were investigated by X-ray difraction (XRD) and transmission electron microscopy (TEM). The specific surface area (BET) was determined by N2 adsorption/desorption at 77 K. The catalytic oxidation of propene and removal NOx were studied by Temperature Program Surface Reaction (TPSR) over every compositions. The results show that the contened of substituted ion Sr2+ influenced on the oxidation temperature of propene.

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  • The oxide reduction diffusion (ORD) procedure has recently been applied in synthesizing hydrogen storage materials AB5 for Ni-MH batteries. Starting from metal hydroxides and La oxalat precursor, superfine powder alloys LaNi5, LaNi4.5Co0.5 and LaNi3.87Mn1.13 were obtained by this “soft-chemistry” route. Chemical composition, structure and morphology of alloy phases were examined by different analysis techniques such as AAS, EPMA, X-ray and TEM. The H2-absorption and desorption behavior of crystalline products was determined by Sieverts’ method.

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  • The carbohydrate moieties of glycosphingolipids from eggs of the human parasite,Schistosoma mansoni,wereenzy-matically released, labelled with 2-aminopyridine (PA), fractionated and analysed by linkage analysis, partial hydrolysis, enzymatic cleavage, matrix-assisted laser desorption/ionization time-of-¯ight mass spectrometry and nano-electrospray ionization mass spectrometry.

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  • The osmoregulated periplasmic glucans (OPGs) produced byRhodobacter sphaeroides, a free-living organism, were isolated by trichloracetic acid treatment and gel permeation chromatography. Compounds obtained were characterized by compositional analysis, matrix-assisted laser desorption ionization mass spectrometry and nuclear magnetic resonance.R. sphaeroidespredominantly synthesizes acyclic glucan containing 18 glucose residues that canbe substituted by one to seven succinyl esters residues at the C6position of some of the glucose residues, and by one or two acetyl resi-dues....

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