microscope Articles
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Simulation of particle capture in a microfiltration membrane
The present study takes an interest in the description of the fouling mechanisms by a numerical approach at the microscopic scale. At first, an X-ray tomography has enabled the modelling of the membrane structure for the numerical simulations. Next, for different particle size, a same volume of particles has been sent in the modelled membrane and the final permeability has been computed. Thus, ...
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Atomic force microscope-based nanomanipulation with drift compensation
Automating the task of nanomanipulation is extremely important since it is tedious for humans. This paper proposes an atomic force microscope (AFM) based force controller to push nano particles on the substrates. A block phase correlation-based algorithm is embedded into the controller for the compensation of the thermal drift which is considered as the main external uncertainty during ...
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Powder Characterization
Powder characterization The macroscopic, physical properties of a powder pile are the basic characteristics of powder materials. Knowledge of these properties is therefore a crucial factor in powder production, processing and packaging, as well as in the transport, storage and application of these materials. Alongside the large number of measuring instruments for characterizing the microscopic ...
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What is Confocal Raman Microscopy?
Confocal Raman microscopy combines the spectral information from Raman spectroscopy with the spatial filtering of a confocal optical microscope for high-resolution chemical imaging of samples. The spectral Raman information is sensitive to the vibrational modes of the sample and provides extensive chemical, physical and structural insight, while the confocal optics of the microscope enable the ...
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Effect of sludge retention time on characteristics of dynamic membrane in sequencing bioreactors
The characteristics of self-forming dynamic membrane (DM) in sequencing bioreactors under different sludge retention times (SRT) (SRT = 5, 10, 20, 40, 60 days) were studied using a scanning electron microscope, particle sizing distribution and others. The results indicated that the SRT has an evident effect on the characteristics of DM. The content of extracellular polymeric substances and ...
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Particle Shape
The properties of particles include particle size, shape, surface structure and pore structure. The shape of the particles can impact on many properties of a powder sample, including specific surface area, flowability, magnetic property, packing property, abrasive property and chemical activity. In order to improve the characteristics and performance of some products, particle shapes have been ...
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Equilibrium, kinetics and process design of acid yellow 132 adsorption onto red pine sawdust
Linear and non-linear regression procedures have been applied to the Langmuir, Freundlich, Tempkin, Dubinin–Radushkevich, and Redlich–Peterson isotherms for adsorption of acid yellow 132 (AY132) dye onto red pine (Pinus resinosa) sawdust. The effects of parameters such as particle size, stirring rate, contact time, dye concentration, adsorption dose, pH, and temperature were ...
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The Measurement of Gas Bubble Size Distributions in a Three Phase Laboratory Gassy Soil
The technique developed can be used to measure the total void, gas void, or particle size distribution in both gassy and saturated sediments provided the void spaces, or particles, can be approximated to spheres. Here the technique is demonstrated for measuring gas bubble size distribution in a reconstituted estuarine silty clay, which has been impregnated with methane gas using the method ...
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A Simple Guide to How Aerosol Particle Counters Work
Overview Aerosol particle counters are built to rapidly count and size contaminant particles in cleanroom air and other controlled environments. Users tend to see this as a device where a button is pressed and absolute results tumble out. However, when measuring anything small, it is important to be aware of the technology within the instrument to understand the relevance of the data generated, ...
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Naturally endowed oxide nanoparticles from carbon ash in Saudi Arabia
Chemical analysis of carbon ash powder obtained from water desalination plants in Saudi Arabia has revealed that 84.3% of the ash is pure carbon while the remaining percentage is combinations of oxide materials, mainly silicon and aluminium. These oxides were extracted by sintering the ash powder at 900°C. Shape and size of the obtained oxide powder were determined by transmission electron ...
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Preparation, characterisation and catalytic activity of gold nanoparticles supported on Co
3O4Gold nanoparticles supported on Co3O4 (Au:Co3O4 = 1:25) were prepared by co–precipitation method. The co–precipitate was studied by using a thermal analysis (Differential Thermal Analysis - DTA and a Differential Thermal Gravimetric Analysis - DTGA). The characterisations of the sample were investigated by using an X–ray Diffraction (XRD), a High–Resolution Transmission Electron Microscope ...
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Super–resolution optical imaging of binary colloidal assemblies
Evaporation induced self–assembly of micro– and nanospheres exhibits 2D and 3D ordered packing. When particles of two different sizes are used, binary colloidal assemblies (BCAs) form metastructures with novel physical properties. Imaging of BCAs with scanning electron microscopy (SEM) limits the view to a surface morphology only. When fluorescence is incorporated into the individual particles, ...
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Sampling Airborne Particles in Clean Rooms - Case study
Our MPS-4G1 Microanalysis Particle Sampler enables engineers in clean rooms to efficiently collect samples of airborne particles for species identification to solve contamination problems. When airborne particles cause contamination problems that affect production of devices in a clean room, steps beyond particle counting are required to pinpoint their sources. Samples of the particles need to ...
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USP 788 vs 1788 - How do They Compare?
Why the USP 1788 update? New flow imaging technologies and therapeutic protein solutions widened the scope of USP 1788. Three primary technologies are discussed in each of the sub-parts of the guidance document: Light Obscuration (LO) is still the preferred first pass method for the USP Normative chapters. If a solution is unable to be tested using LO, either due to clarity (color, opacity) ...
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Activated charcoal–magnetic nanocomposite for remediation of simulated dye polluted wastewater
Herein, we report a straightforward way to fabricate activated charcoal–magnetic nanocomposite (AC–MNC) by chemical precipitation for the sequestration of methylene blue (MB) from a simulated solution. The synthesised nanocomposite was characterised by Fourier transform infra-red (FTIR), Brunauer–Emmett–Teller (BET), transmission electron microscope (TEM) and ...
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Coagulation-adsorption of reactive orange from aqueous solution by freshly formed magnesium hydroxide: mixing time and mechanistic study
The utilization of magnesium hydroxide was successfully carried out to remove reactive orange by coagulation-adsorption from aqueous solution. The coagulation-adsorption mechanisms and magnesium hydroxide-reactive orange floc property were analyzed through zeta potential, scanning electron microscope (SEM), X-ray diffraction and Fourier transform infrared spectroscopy (FT-IR). Flocculation ...
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Response surface modeling of bioremediation of acid black 52 dye using Aspergillus flavus
Bioremediation is an efficient process to remove metals and dyes from solutions using different micro-organisms. In the present study, the efficiency of growing Aspergillus flavus (isolated from the effluent of an electroplating industry) to treat a synthetic solution of acid black 52 dye (a trivalent chromium complex dye) was investigated. Maximum removal of dye and chromium was observed to ...
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Differences in Centrifuges
Like microscopes, centrifuges come in many variations. It can be challenging to pinpoint precisely which kind of centrifuge you need when there are things like rotor type and size, tube capacity, unit size, speed and refrigeration to consider. We are here to help you learn about the differences in centrifuges, as C & A is a leader in medical equipment designed for ease of use and ...
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Atmospheric Aerosol Research - Case study
Our PC-2H Quartz Crystal Microbalance (QCM) multistage real-time cascade impactor and Microanalysis Particle Samplers have helped scientists worldwide to study particles in the upper atmospheres in all corners of the earth, over volcanoes, oceans, the Arctic and Antarctica regions. Whether it is for measuring the mass concentration and size distribution of particles in the atmosphere over an ...
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