scholarly journals Investigation of Adsorption Behavior of Cu2O Submicro-Octahedra towards Congo Red

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Xu Zhang ◽  
Ying Zhang ◽  
Dong Wang ◽  
Fengyu Qu
Keyword(s):  
Cuprous Oxide ◽  
Congo Red ◽  
Adsorption Behavior ◽  
X Ray Diffraction ◽  
Adsorbed Species ◽  
Adsorption Ability ◽  
Chemical Additive ◽  
X Ray ◽  
Short Time ◽  
Facile Route

Perfect cuprous oxide (Cu2O) nanocrystals with octahedron shape were successfully synthesized by a facile route without chemical additive in a short time. The products were characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM). The adsorption ability of the products towards congo red (CR) as the pollutant was investigated and FTIR spectroscopy was employed to identify the adsorbed species. The adsorption behavior was analyzed based on the microstructure of Cu2O submicro-octahedra.

Leaching Studies of Cement-Glass Package Containing Sodium Borate

1986 ◽  
Vol 84 ◽  
Author(s):  
Masahiro Okamoto ◽  
Koichi Chino ◽  
Tsutomu Baba ◽  
Tatsuo Izumida ◽  
Fumio Kawamura ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Liquid Waste ◽  
Sodium Borate ◽  
Pressurized Water Reactor ◽  
X Ray Diffraction ◽  
Adsorption Ability ◽  
Pressurized Water ◽  
X Ray ◽  
Solidification Reaction ◽  
Main Components

AbstractA new solidification technique using cement-glass, which is a mixture of sodium silicate, cement, additives, and initiator of the solidification reaction, was developed for sodium borate liquid waste generated from pressurized water reactor (PWR) plants. The cement-glass could solidify eight times as much sodium borate as cement could, because the solidifying reaction of the cement-glass is not hindered by borate ions.The reaction mechanism of sodium silicate and phosphoric silicate (initiator), the main components of cement-glass, was studied through X-ray diffraction and compressive strength measurements. It was found that three- dimensionally bonded silicon dioxide was produced by polymerization of the two silicates. The leaching ratio of cesium from the cement-glass package was one-tenth that of the cement one. This low value was attributed to a high cesium adsorption ability of the cement-glass and it could be theoretically predicted accordingly.

Development of WC-Fe3Al Composites by Spark Plasma Sintering Process

2016 ◽  
Vol 881 ◽  
pp. 307-312
Author(s):  
Luis Antonio C. Ybarra ◽  
Afonso Chimanski ◽  
Sergio Gama ◽  
Ricardo A.G. da Silva ◽  
Izabel Fernanda Machado ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Zinc Stearate ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Plasma Sintering ◽  
Al Composite ◽  
Spark Plasma ◽  
Short Time ◽  
Vibration Mill

Tungsten carbide (WC) based composites are usually produced with cobalt, but this binder has the inconvenience of shortage, unstable price and potential carcinogenicity. The objective of this study was to develop WC composite with intermetallic Fe3Al matrix. Powders of WC, iron and aluminum, with composition WC-10 wt% Fe3Al, and 0.5 wt% zinc stearate were milled in a vibration mill for 6 h and sintered in a SPS (spark plasma sintering) furnace at 1150 °C for 8 min under pressure of 30 MPa. Measured density and microstructure analysis showed that the composite had significant densification during the (low-temperature, short time) sintering, and X-ray diffraction analysis showed the formation of intermetallic Fe3Al. Analysis by Vickers indentation resulted in hardness of 11.2 GPa and fracture toughness of 24.6 MPa.m1/2, showing the feasibility of producing dense WC-Fe3Al composite with high mechanical properties using the SPS technique.

Effect of NABr on the Pore Size and Surface Morphology of Cu Foam Prepared by Hydrogen Bubble Templating

2021 ◽  
Vol 880 ◽  
pp. 83-88
Author(s):  
Mary Donnabelle L. Balela ◽  
Reginald E. Masirag ◽  
Francis O. Pacariem Jr. ◽  
Juicel Marie D. Taguinod
Keyword(s):  
Polyethylene Glycol ◽  
Cuprous Oxide ◽  
Active Material ◽  
Current Collector ◽  
Hydrogen Bubble ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cu Foam ◽  
Interconnected Pores

Binderless supercapacitor electrodes are currently being employed to increase the surface contact between the active material and current collector, leading to enhanced capacitance. In binderless electrodes, the active material is directly grown on the surface of the current collector, omitting the use of insulative polymer-based binders. In this work, Cu foam was successfully electrodeposited on Cu sheet by dynamic hydrogen bubble templating (DHBT) using polyethylene glycol (PEG) and sodium bromide (NaBr) as additives. The current density was set at 3 A·cm-2 and electrodeposition was performed for 20 s. At 200 mg/L PEG, increasing the NaBr concentration from 0 to 80 mM produced Cu foam with decreasing pores sizes of about 75.15 to 34.10 μm. However, the walls of the interconnected pores became thicker as the pore diameters were reduced. This indicates that NaBr promotes Cu deposition rather than hydrogen evolution reaction (HER), leading to smaller pore sizes. X-ray diffraction confirms the oxidation of the Cu foam under ambient conditions forming cuprous oxide (Cu2O). The Cu2O/Cu foam was then utilized as binderless electrode for supercapacitor, resulting to a specific capacitance of 0.815 F·cm-2 at 5 mV·s-1. Results show the potential of the fabricated Cu2O/Cu foam as binderless electrode for pseudo-type supercapacitors.

Synthesis of Nickel Hydroxide with Different Morphologies Using an Ionic Liquid

2010 ◽  
Vol 663-665 ◽  
pp. 1163-1166
Author(s):  
Cun Ying Xu ◽  
Yi Xin Hua
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ionic Liquid ◽  
Volume Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Reaction Media ◽  
Solvothermal Conditions ◽  
Facile Route ◽  
Scanning Electron

A new and facile route has been developed to synthesize β-Ni(OH)2 nanostructures using ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) as reaction media under solvothermal conditions. The β-Ni(OH)2 with different morphologies, such as nanoflakes, nanoplatelet and nanorods, can be obtained by controlling the volume ratio of the ionic liquid to water and reaction temperature. The as-prepared products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).

Adsorption behavior of samarium(III) from aqueous solutions onto PAN@SDS core-shell polymeric adsorbent

2015 ◽  
Vol 103 (6) ◽  
Author(s):  
Mamdoh R. Mahmoud ◽  
Mohamed A. Soliman ◽  
Karam F. Allan
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Aqueous Solutions ◽  
Sodium Dodecyl ◽  
Adsorption Behavior ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Polymeric Adsorbent ◽  
X Ray ◽  
Radiation Induced ◽  
Ft Ir

AbstractAdsorption behavior of samarium(III) radionuclides from aqueous solutions onto a novel polyacrylonitrile coated with sodium dodecyl sulfate (PAN@SDS), prepared by gamma radiation-induced polymerization, was studied in this work. The developed polymeric adsorbent was characterized by FT-IR, X-ray diffraction and N

Study on Manufacturing Process and Applying of Galvalume

2011 ◽  
Vol 704-705 ◽  
pp. 1406-1409
Author(s):  
Meng Song ◽  
Yun Li Feng ◽  
Jing Bo Yang
Keyword(s):  
Annealing Treatment ◽  
Alloy Coating ◽  
Alloy Layer ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Elongation ◽  
Coated Surface ◽  
Short Time ◽  
Zn Alloy ◽  
Thermal Simulation Experiment

Annealing and dip galvanizing treatments of Galvalume were studied by using methods of Gleeble thermal simulation experiment and optical microscopy (OM), scanning electronic microscopy (SEM), X-ray energy dispersive analysis (EDAX), X-ray diffraction (XRD) and so on. Meanwhile, surface morphology, microstructure, phases and the respective compositions of Al-Zn alloy coating plate were analyzed. The results show that decreased rate and prolonged time of annealing treatment cause less effect on process ability of product, which all because of the short time of annealing process in continuous aluminum-zinc treatment. However, coarse grain which causes low strength, high elongation and r value occurs when rising annealing temperature. To get better coated surface, in-zinc pot temperature should be controlled in the range of 590~610°C, and height of air-knife nozzle should be kept in the range of 150~200mm. Surface layer of 55％Al-Zn alloy coating is covered by Al-Zn alloy, the intermediate alloy layer is consisted of binary and ternary compounds, such as θ phase (FeAl3), Al0.3Fe3Si0.7 and Al3.21Si0.47. Keywords: Galvalume, Process, Microstructure, Properties

scholarly journals The impact of crystal size and temperature on the adsorption-induced flexibility of the Zr-based metal–organic framework DUT-98

2019 ◽  
Vol 10 ◽  
pp. 1737-1744 ◽  
Author(s):  
Simon Krause ◽  
Volodymyr Bon ◽  
Hongchu Du ◽  
Rafal E Dunin-Borkowski ◽  
Ulrich Stoeck ◽  
...  
Keyword(s):  
Crystal Size ◽  
Metal Organic Framework ◽  
Adsorption Behavior ◽  
Switching Behavior ◽  
Type I ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
The Impact ◽  
Organic Framework

In this contribution we analyze the influence of adsorption cycling, crystal size, and temperature on the switching behavior of the flexible Zr-based metal–organic framework DUT-98. We observe a shift in the gate-opening pressure upon cycling of adsorption experiments for micrometer-sized crystals and assign this to a fragmentation of the crystals. In a series of samples, the average crystal size of DUT-98 crystals was varied from 120 µm to 50 nm and the obtained solids were characterized by X-ray diffraction, infrared spectroscopy, as well as scanning and transmission electron microscopy. We analyzed the adsorption behavior by nitrogen and water adsorption at 77 K and 298 K, respectively, and show that adsorption-induced flexibility is only observed for micrometer-sized crystals. Nanometer-sized crystals were found to exhibit reversible type I adsorption behavior upon adsorption of nitrogen and exhibit a crystal-size-dependent steep water uptake of up to 20 mmol g−1 at 0.5 p/p 0 with potential for water harvesting and heat pump applications. We furthermore investigate the temperature-induced structural transition by in situ powder X-ray diffraction. At temperatures beyond 110 °C, the open-pore state of the nanometer-sized DUT-98 crystals is found to irreversibly transform to a closed-pore state. The connection of crystal fragmentation upon adsorption cycling and the crystal size dependence of the adsorption-induced flexibility is an important finding for evaluation of these materials in future adsorption-based applications. This work thus extends the limited amount of studies on crystal size effects in flexible MOFs and hopefully motivates further investigations in this field.

scholarly journals Formation of amyloid-like aggregates through the attachment of protein molecules to a Congo red scaffolding framework ordered under the influence of an electric field

2010 ◽  
Vol 8 (1) ◽  
pp. 41-50 ◽  
Author(s):  
Barbara Stopa ◽  
Barbara Piekarska ◽  
Leszek Konieczny ◽  
Marcin Król ◽  
Janina Rybarska ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Electric Field ◽  
Congo Red ◽  
Polarized Light ◽  
Sodium Dithionite ◽  
Ordered Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Protein Molecules ◽  
Ordered State

AbstractThis study describes a technique which makes it possible to introduce the amyloid-like order to protein aggregates by using the scaffolding framework built from supramolecular, fibrillar Congo red structures arranged in an electric field. The electric field was used not only to obtain a uniform orientation of the charged dye fibrils, but also to make the fibrils long, compact and rigid due to the delocalization of pi electrons, which favors ring stacking and, as a consequence, results in an increased tendency to self-assemble. The protein molecules (immunoglobulin L chain lambda, ferritin) attached to this easily adsorbing dye framework assume its ordered structure. The complex precipitating as plate-like fragments shows birefringence in polarized light. The parallel organization of fibrils can be observed with an electron microscope. The dye framework may be removed via reduction with sodium dithionite, leaving the aggregated protein molecules in the ordered state, as confirmed by X-ray diffraction studies.

X-Ray Diffraction Analysis of Oxide Layers of Zr-Based Alloys

2007 ◽  
Vol 567-568 ◽  
pp. 237-240
Author(s):  
Galina Gosmanová ◽  
Ivo Kraus ◽  
Michal Kolega ◽  
Věra Vrtílková
Keyword(s):  
Residual Stresses ◽  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
Transient Conditions ◽  
Oxide Layers ◽  
X Ray ◽  
Corrosion Kinetics ◽  
Short Time ◽  
Kinetics Of ◽  
Tubular Specimens

The results of X-ray diffraction analysis of macroscopic stresses σ and crystallite size D in oxide layers are presented in this contribution. The oxide layers were formed on tubular specimens of Zircaloy 4 and Zr1Nb alloys which were simultaneously oxidized for various times under temperature transient conditions (oxidation in water at 360 °C with a short-time shock in steam at 500 °C). A qualitative relation was outlined between the residual stresses in oxide layers and corrosion kinetics of the alloys under investigation.

Image intersification applied to biological problems

1972 ◽  
Vol 5 (3) ◽  
pp. 295-347 ◽  
Author(s):  
George T. Reynolds
Keyword(s):  
Specific Activity ◽  
Biological Research ◽  
Biological Processes ◽  
X Rays ◽  
Radioactive Tracers ◽  
X Ray Diffraction ◽  
Time Intervals ◽  
X Ray ◽  
Rapid Sequence ◽  
Short Time

In many important types of observations in biological research, the information provided by the specimens is in the form of photons-quanta of visible light, u.v., or X-rays. The process of observation becomes one of recording this information in useful form, with as high an efficiency as possible. The problem becomes particularly important when for some reason or other the total number or rate of quanta provided by the specimen is small. Examples of such limitations are included in the following: (i) Processes permitting only low-intensity illumination in order not to interfere with the biological processes under observation. (ii) Processes changing very rapidly and requiring rapid sequence recording. (iii) Processes providing only a limited number of photons per event, such as bioluminescence. (iv) Processes in which radioactive tracers are utilized, and observation of radioactivity is desirable at low specific activity or within short time intervals. (v) X-ray diffraction processes where the specimen is weakly diffracting or where the X-ray intensity must be kept low in order not to damage the specimen. (vi) Processes involving the observation of fluorescence, where the intensity is low because of limitations on the amount of tagging material.

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