Structural and Morphological Studies on Strontium Tin Phosphate SrSn(PO4)2 Nanopowder

A correlative study on electrochemical and optical properties of LLZO (Li7La3Zr2O12) garnet electrolyte

The aim of this study was to explore a new nano-composite carbon adsorbent material for the removal of arsenic from water. The multilayer carbon nanotubes (MCNTs) were treated with different acids and/or modified with iron to create more surface COOH sites or Fe-impregnated MCNTs for the enhanced uptake of As(V). Tests were conducted as a function of initial As(V) concentrations, contact time, and solution pH. The coverage of ferric hydroxides on MCNTs and the uptake of As on Fe-MCNTs were independently confirmed by field emission scanning electron microscope and energy dispersive X-ray spectroscopy analyses. With an As(V) uptake capacities of 27 mg/g on Fe-MCNTs and 14 mg/g on acid-MCNTs, the material showed superior performance for As(V) removal.

Spray dried powder of lutein-rich supercritical carbon dioxide extract of gamma-irradiated marigold flowers: Process optimization, characterization and food application

A one-step process for copper nanopatterning on a silicon surface is reported. The patterns were formed by selective copper electroless deposition from a diluted solution on defect sites on the silicon surfaces introduced by nanomechanical scratching. Field emission scanning electron microscopy and energy dispersive X-ray spectroscopy analyses show that copper particles were deposited preferentially on well-defined defect sites with high selectivity. The experiment demonstrated here shows a new one-step approach for metallic nanopatterning formation on a silicon surface. © 2003 The Electrochemical Society. All rights reserved.

The current study considered the calcium lignosulfonate as a stabilizing material to stabilize black cotton soil as it do not release CO2 upon reacting with soil, unlike traditional stabilizers and can be a sustainable material that helps to achieve Sustainable Development Goals as it is an eco-friendly, non-traditional stabilizer and organic polymer. In addition to that, it is vital to understand the micro-structural properties of treated soil to have a comprehensive knowledge on strength improvement mechanism. To examine the optimum calcium lignosulfonate content, black cotton soil was mixed with different dosages of calcium lignosulfonate ranging from 1 to 5% with an increment of 1% and the optimum content of 4%. The densely packed structure contributed by formation of Calcium Silicate Hydrate in treated soil enhanced the soaked California Bearing Ratio up to 8.13% and Unconfined Compressive Strength up to 203.80 kPa. This enhanced strength characteristics in the black cotton soil appraised by the X-Ray Diffraction, Field Emission Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy analyses. The optimum CBR value and decreased thickness of the pavement made the stabilized BC soil suitable for subgrade material for pavement construction.

PurposeTo evaluate the shear bond strength (SBS) between Y-TZP and a resin luting agent, after 1 of 2 enhancing strategies with TiO2--nts was applied, either to the resin luting agent or the Y-TZP mass, in different concentrations. MethodsIn the Strategy TiO2-nts on ceramic, the resin luting agent Panavia F2.0™ (Kuraray) and an experimental Y-TZP with added concentrations of TiO2--nts (0%, 1%, 2%, and 5% vol/vol) and a commercial Y-TZP, comprised 5 different groups (n = 10). In the Strategy TiO2-nts on cement, the resin luting agent RelyX U200™ (3 M ESPE) was added with different concentrations of TiO2--nts (0%, 0.3%, 0.6%, 0.9% wt/wt) luted to a commercial Y-TZP, comprising 4 different groups (n = 10). The Y-TZP discs were included in acrylic bases, and a cylinder (3 × 3 mm) of the correspondent luting agent for each respective group was applied over them. After 24 h, specimens were subjected to SBS assessments in a universal testing machine. Field emission scanning electron microscopy and energy dispersive X-ray spectroscopy analyses were also performed on Y-TZP surfaces. Data were analyzed via analysis of variance and Tukey tests (α = 0.05). ResultsTiO2-nts on ceramic influenced the bond strength significantly, but not linearly; TiO2-nts on cement did not influence bond strength when analyzed separately, nor in comparison with the first. ConclusionY-TZP enhancements with TiO2-nts led to a higher SBS with Panavia F2.0, a 5% TiO2--nt concentration presented the highest bond strength. Modified Rely X U200 did not improve SBS.

The current study considered the calcium lignosulfonate as a stabilizing material to stabilize black cotton soil as it do not release CO2 upon reacting with soil, unlike traditional stabilizers and can be a sustainable material that helps to achieve Sustainable Development Goals as it is an eco-friendly, non-traditional stabilizer and organic polymer. In addition to that, it is vital to understand the micro-structural properties of treated soil to have a comprehensive knowledge on strength improvement mechanism. To examine the optimum calcium lignosulfonate content, black cotton soil was mixed with different dosages of calcium lignosulfonate ranging from 1 to 5% with an increment of 1% and the optimum content of 4%. The densely packed structure contributed by formation of Calcium Silicate Hydrate in treated soil enhanced the soaked California Bearing Ratio up to 8.13% and Unconfined Compressive Strength up to 203.80 kPa. This enhanced strength characteristics in the black cotton soil appraised by the X-Ray Diffraction, Field Emission Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy analyses. The optimum CBR value and decreased thickness of the pavement made the stabilized BC soil suitable for subgrade material for pavement construction.

A hydroxyapatite (HAp) coating on 2304 duplex stainless steel (DSS) through an electrophoretic deposition process has been investigated in this work. The deposition voltage was 30 V with a time of 2 min. Field emission scanning electron microscopy and energy dispersive X-ray spectroscopy analyses were used for the microstructural and chemical examination of coatings, respectively. The Ca to P ratio for the nano HAp coating on 2304 DSS has been determined as equal to 1.642. It was observed from X-ray diffraction patterns that HAp nanoparticles were successfully combined into the substrate. The corrosion behavior of all samples was tested in simulated body fluid using a potentiodynamic polarization study. A homogeneous structure with a thin crack-free layer was obtained. Moreover, the porosity of this coating was very low leading to a high corrosion resistance, thus promoting good biocompatibility.

Nano-ferrite of the general formula Mg0.7Cu0.3Fe2O4 was prepared by citrate-gel auto combustion method. The structure was studied by X-ray diffraction, Brunauer–Emmet–Teller, field emission scanning electron microscopy and energy dispersive X-ray spectroscopy analyses. The crystallite size of the investigated nano ferrite was ≅39 nm. The magnetic hysteresis measurements at different temperatures (100, 170, 240, and 300 K) were performed using a vibrating sample magnetometer. A correlation between magnetic behavior and lattice strain has been established. Arrott plot has been employed to understand the magnetic behavior of nano-crystalline Mg0.7Cu0.3Fe2O4. The magnetic susceptibility was carried out using Faraday’s method. Magnetic constants such as Curie temperature, effective magnetic moment, saturation magnetization, and coercivity were obtained and reported. Based on UV diffuse reflectance spectroscopy studies, the optical band gaps are in the range from (1.3–1.9 eV), hence the investigated samples could act as visible light driven photo catalysts.

Hetero-structured CoTiO3 nano-composite photocatalyst was produced by a modified sol–gel process diethylene glycol as as stabilizer and coated on glass as a thin film by Doctor Blade coating. CoTiO3 nano-composites were calcinated at 550, 650 and 750 °C to study the structure and phase formation of CoTiO3 nano-composites. X-ray diffraction results showed that the pure CoTiO3 nano-crystalline phase is formed at 650 °C while Co3O4 and TiO2 were present as impurities at 550 and 750 °C annealing temperatures. Field emission scanning electron microscopy and energy dispersive X-ray spectroscopy analysis of hetero-structured CoTiO3 nano-composite coated on a glass reveal the formation of spherical shape of nano-crystalline phases with an average size of 75 nm. The Fourier transform infrared spectroscopy results showed the existence of Co–O, Ti–O, and Ti–O–Co bonds. Thermogravimetric and derivative thermogravimetric analysis show that the weight loss phases are completed at 750 °C with peak temperatures of 107 and 345 °C. The UV–vis diffuse reflectance spectra reveal the optical band gaps of 1.587 eV (781 nm) and 2.079 eV (596 nm). Photocatalytic activity of hetero-structured CoTiO3 nano-composite photocatalyst was examined for degradation of Nile blue dye and the results showed complete degradation in 2.5 h of light irradiation. This is attributed to the efficient separation of electron–hole pairs of the CoTiO3 nano-composite, narrow band gap, and visible-light harvesting ability.

A biomineral is a crystalline or amorphous mineral product of the biochemical activity of an organism and the local accumulation of elements available in the environment. The cactus family has been characterized by accumulating calcium oxalates, although other biominerals have been detected. Five species of Cacteae were studied to find biominerals. For this, anatomical sections and Fourier transform infrared, field emission scanning electron microscopy and energy dispersive x-ray spectrometry analyses were used. In the studied regions of the five species, they presented prismatic or spherulite dihydrate calcium oxalate crystals, as the predominant biomineral. Anatomical sections of Astrophytum asterias showed prismatic crystals and Echinocactus texensis amorphous silica bodies in the hypodermis. New findings were for Ariocarpus retusus subsp. trigonus peaks assigned to calcium carbonate and for Mammillaria sphaerica peaks belonging to silicates.

With continuous improvements in nanotechnology, the development of micro/nanoscale pores and fractures in reservoirs can be more clearly identified, and great progress has been made in tight sandstone and shale. Bedrock has an ultralow porosity and is a reservoir with low permeability. To study the characteristics of micro/nanoscale pore development and reveal their petroleum significance in the eastern segment of the Altun Piedmont, research has been conducted with the use of cathodoluminescence, field emission scanning electron microscopy and energy spectrum analysis, formation microresistivity image logging, high-pressure mercury injection and nuclear magnetic logging. The results have shown that the porosity of the bedrock reservoir in the eastern segment of the Altun Piedmont, as measured by helium injection and nuclear magnetic logging, is between 0.004% and 9.76%, the average porosity is between 1.663% and 3.844%, and the permeability is between the maximum of 0.002 mD and 33.239 mD. The average permeability is between 0.02 mD and approximately 3.836 mD. Micro/nanopores are generally developed, with the majority being intragranular micro/nanopores, intercrystalline micro/nanopores and microcracks, as summarized by the field emission scanning electron microscopy and energy dispersive spectroscopy analysis. Four differently sized pores develop: micropores account for approximately 20%, transition pores account for approximately 30%, and mesopores and macropores account for approximately 25% each. The pore throat development below 100 nm is greater than 50% according to the collation of experimental data from high-pressure mercury intrusion; therefore, micro/nanopores are the main storage space in the study area, and the gas logging shows good results. Micro/nanopores are also one of the main reservoir spaces of bedrock reservoirs in conjunction with the conventional reservoir space, and thus, micro/nanopores have important petroleum significance.

Multifunctional characterization of multiferroic [Pb(Fe0.5Nb0.5)O3]0.5 - [(Ca0.2Sr0.8)TiO3]0.5 for storage and photocatalytic applications

Introducing of WO3@NiCo2O4/rGO ternary nanocomposites as active material for high-performance supercapacitor applications

Luminescence properties of ZrO2: Dy3+ phosphor for solid-state lighting applications