surface characterization Articles
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Defluoridation of water by chemical impregnated Artocarpus hirsutus sawdust
Sawdust of Artocarpus hirsutus impregnated with ferric hydroxide and activated alumina (SFAA) has been studied for defluoridation of water. This paper presents a detailed surface characterization of the adsorbent by studying pore size distribution and surface morphology. By combining the constituents in the right proportion, an adsorbent with a well-developed pore size distribution could be ...
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A comparison of electrochemical oxidation performance of PbO2 and SnO2 electrodes
PbO2 and SnO2 are two promising anode materials for electrochemical oxidation. In order to highlight the difference between two kinds of electrodes in an electrochemical oxidation process, their morphology, structural, oxygen evolution overpotential (OEP), electrochemical activity and service life-time were compared in detail in this paper. Surface characterization by scanning electron ...
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An insight into the mechanism of biosorption of copper by Bacillus polymyxa
Our main objective was to isolate bacteria from soil contaminated with effluents from electroplating wastewater and assess their potential to remove copper from the aqueous phase. The strain identified as Bacillus polymyxa accumulated copper inside the cell, where it bound to the cell wall. The intracellular metal accumulation led to the inhibition of dehydrogenases, which is essential for the ...
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Realisticstable Water-In-Oil Emulsions at Ohmsett
ABSTRACT This paper discusses the first two phases of a multiphase study to create predictable stable water-in-oil (W/O) emulsions at Ohmsett including a lab study and a large tank-scale study. The first stage of the study refined the process of creating, characterizing, and testing small batches of W/O emulsions under controlled and reproducible conditions in the laboratory to determine if the ...
By OHMSETT
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Dynamic Ressource Management: Contribution of the Chlorophyll-a Monitoring in Karstic Systems - Case Study
Main goals: Characterize a karst system exploited by springs and wells Characterize the surface karst water connections Results: Well on the Drain Annex System (DAS) Sping on the main karstic Drain (D) Opportunities: Inversion monitoring (estavelle) and dynamic pumping management in karstic systems ...
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One-step hydrothermal synthesis of CTAB-modified SiO2 for removal of bisphenol A
A stable SiO2 material marked as CTAB-Ms(x) was synthesized by a novel sol-gel method. It was modified with hexadecyl trimethyl ammonium bromide (CTAB), which resulted in high adsorption capacity. Its microstructure and surface functional groups were characterized by scanning electron microscope, transmission electron microscope and Fourier transform infrared. The results showed that ...
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Dispersion Properties of an Alumina Nanopowder Using Molecular, Polyelectrolyte, and Steric Stabilization
A commercial alumina nanopowder was characterized and its dispersion was studied using electrostatic, electrosteric, and steric surfactants. Citric acid was used as the electrostatic dispersant, ammonium polymethacrylic acid (Oarvan C) as the electrosteric dispersant, and Hypermer KD-1 in ft-terpineol as a purely steric system. Phase stability in water was examined by X-ray diffraction, and the ...
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Characterizing cell surface of blooming Microcystis in Lake Taihu, China
Microcystis occurs as colonies in the natural environment but disaggregates into single cells in laboratory cultures. In order to explore the mechanism of how Microcystis forms colonies, the zeta potentials of Microcystis cells from the laboratory and the field were studied, and the hydrophobicity of Microcystis colonies in different sizes was investigated in Lake Taihu. The incubation ...
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New Surface Area Reference Materials to Support Exemplary Quality Assurance in Routine Measurements
Micromeritics Instrument Corp., a global leader in surface area measurement, has introduced a new range of secondary standards which makes it easier to demonstrate the highest levels of data integrity when characterizing surface area by gas adsorption. Traceable to either NIST (National Institute of Standards and Technology) or BAM (Bundesanstalt für Materialforschung und -prüfung) ...
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Observational needs for four-dimensional air quality characterization
Surface-based monitoring programs provide the foundation for associating air pollution and causal effects in human health studies, and they support the development of air quality standards and the preparation of emission reduction strategies. While surface-oriented networks remain a key tool for addressing traditional single pollutant human exposure challenges, these networks in isolation are not ...
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Effects of DMSO and glycerol additives on the property of polyamide reverse osmosis membrane
The polyamide reverse osmosis (RO) membranes were prepared through interfacial polymerization of m-phenylenediamine (MPD) and trimesoyl chloride (TMC). The use of dimethyl sulfoxide (DMSO) and glycerol as additives for the formation of thin-film composite (TFC) was investigated. We studied the effect of DMSO and glycerol addition on membrane property and RO performance. Microscopic morphology ...
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A simple methodology for surface layer characterization during diabatic extremes
Abstract Increased global environmental awareness has fostered widespread use of remote automated weather station (RAWS) networks to monitor meteorological conditions, and reliance on atmospheric dispersion modeling for decisions concerning pollutant dispersion. Dispersion models require as input a characterization of surface layer (SL) heat and momentum fluxes and turbulence. Characterization ...
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Bentonite surface modification and characterization for high selective phosphate adsorption from aqueous media and its application for wastewater treatments
Raw and modified bentonite has been used to develop effective sorbents to remove phosphate from aqueous solution. Acid thermoactivation, Rewoquate, Irasoft, calcium, Fe and Al were employed to treat the bentonite. Results show that samples adsorption capacity for phosphate is in the order of, unmodified bentonite = acid thermoactivation < Rewoquate < calcium ≅ Irasoft < Fe < Al ≅ ...
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The hydrogeochemistry of the Lake Waco drainage basin, Texas
The origin of surface water chemistry in highly impacted drainage basins must be investigated on a drainage-basin scale if the causes of the pollution are to be elucidated. This study characterizes and deciphers the surface water chemistry of a nutrient polluted river system in central Texas. Four tributaries of the Lake Waco reservoir were chemically characterized temporally and spatially in ...
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Environmental characterization of surface runoff from three highway sites in Southern Ontario, Canada: 1. Chemistry
Highway runoff is a significant source of contaminants entering many freshwater systems. To provide information on effects of highway runoff on aquatic biota, runoff samples were collected from three sites representing different classes of highways with low, intermediate and high traffic intensities. Samples were analysed for chloride, trace metals and polycyclic aromatic hydrocarbons (PAHs). ...
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Surface characterisations and photocatalytic property of MWO 4 (M = Fe 2+ , Co 2+ , Ni 2+ ) nanoparticles
MWO 4 (M = Fe 2+ , Co 2+ , Ni 2+ ) nanocrystalinee synthesised by a salt aqueous solution reaction show similar nanoparticle size, good ultraviolet-visible light absorption and narrow bandgap energy. The oxidation-reduction potential of methyl orange aqueous solution with initial pH = 5−7 is positively varied as presence of the nanoparticles in ultraviolet-visible light irradiation, ...
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Characterisation of surface organisation and morphology of some new experimental dental resin–based composites
The aim of this work was to investigate the morphology and to determine the roughness of a series of three new experimental resin–based composite materials containing different inorganic fillers using the AFM technique. Dental composites with photochemical initiation of polymerisation were prepared using the same resin consisting of synthesised aromatic dimethacrylic oligomers mixture containing ...
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Complete and Fast 3D Measurement Solution, New S neox Five Axis
Sensofar Metrology is proud to announce the release of a New S neox Five Axis. The new 3D optical profiler still combining the same high-accuracy rotational module, the high-resolution translation platform and advanced inspection and analysis capabilities but includes the best improvements in terms of design, functionality, performance and speed. This enables automated 3D surface measurements at ...
By Sensofar
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Coating techniques for glass beads as filter media for removal of manganese from water
Dry as well as wet coating techniques were developed to coat glass beads as filter media to remove manganese from water. For dry coating, powdered manganese oxide ore was fixed on the media surface. Wet coating was achieved by depositing synthetic manganese oxides onto the bead surface. The media were characterized by electron microscopy as well as by testing the removal of Mn2+ in a ...
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Temperature dependent morphological evolution of Rh nanopyramids
The temperature dependent oxygen–induced nanopyramidal faceting of atomically rough Rh(210) surface has been studied using scanning tunnelling microscopy (STM). Rh(210) surface is annealed in oxygen at temperature ≥550 K, the surface completely covered with nanometre–scale facets. The annealing temperature is found to be one of the responsible factors for the nucleation and growth of faceted ...
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