Particles and powders

Xem 1-15 trên 15 kết quả Particles and powders
  • (bq)the objective of this textbook is to introduce the subject of particle technology to students studying degree courses in disciplines requiring knowledge of the processing and handling of particles and powders.

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  • The magnetic properties of the nanoparticle powders are strongly dependent on the preparation conditions. The milling process produces damages and defects not only on the surface, but also the crystal structure inside the particles, that cause an undesired strong reduction of saturation magnetization (Ms) and an increase of coercivity (Hc). A suitable post-milling heat treatment is able to heal the particles and recover most of their saturation magnetization and magnetic softness. The nanoparticles are then mixed with paraffin for microwave and radar absorption measurements.

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  • The effects of micronization methods, mechanical and jet millings, on the physico-chemical properties of mushroom (Lentinus edodes) powder were investigated in contrast to shear pulverization. The powders of dried mushroom cap and stipe were prepared to obtain six powders. Compared to shear pulverization, mechanical and jet millings effectively reduced particle size and brought about a narrow and uniform particle size distribution.

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  • Influence of mn2 concentration and uv irradiation time on the luminescence properties of mn doped zns nanocrystals. The structure and particle size of the obtained powders were measured by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and shown that all samples are single phase with sphalerite crystal structure and average particle size of about 5-7nm.

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  • The structural and optical properties of the powder were studied carefully with XRD, SEM, FTIR, Raman and UV-Vis measurements. At optimized annealing temperature (from 900 oC to 1000 oC), the synthesized STO nano particles have a good structure. The shape, size and optical band gap of the obtained material are suitable for further applications.

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  • The probability of Type-I error for the plutonium Material Unaccounted For (MUF) is evaluated by the hypothesis testing method as a function of the sizes of powder particles and granules, which are dominant parameters to determine the sample size. The results show the probability of Type-I error is occasionally greater than 5%. However, increasing granule sample sizes could surmount the weakness of material accounting because of the non-uniformity of nuclide composition.

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  • Adsorption occurs whenever a solid surface is exposed to a gas or liquid: it is defined as the enrichment of material or increase in the density of the fluid in the vicinity of an interface. Under certain conditions, there is an appreciable enhancement in the concentration of a particular component and the overall effect is then dependent on the extent of the interfacial area. For this reason, all industrial adsorbents have large specific surface areas (generally well in excess of 100mZg-I) and are therefore highly porous or composed of very fine particles...

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  • The Elastomeric Alloy (EA) materials based on polypropylene (PP) and Vietnam waste Rubber Powder (RP) has been prepared in internal mixer of Haake in melting state with peroxide initiator. Dynamically stabilizing process at presence of radical donor and acceptor systems has leaded to form chemical bonds on the surface between two phases of surspending rubber powder and PP matrix and then to form intermediate phase surrounding Rubber Particles and making EA higher dense than that of materials by simple mixing RP and PP without networking.

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  • This contribution book collects reviews and original articles from eminent experts working in the interdisciplinary arena of novel drug delivery systems and their uses. From their direct and recent experience, the readers can achieve a wide vision on the new and ongoing potentialities of different drug delivery systems. Since the advent of analytical techniques and capabilities to measure particle sizes in nanometer ranges, there has been tremendous interest in the use of nanoparticles for more efficient methods of drug delivery.

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  • (bq) part 2 book “pulmonary drug delivery” has contents: particle engineering for improved pulmonary drug delivery through dry powder inhalers, particle surface roughness – its characterisation and impact on dry powder inhaler performance, drug delivery strategies for pulmonary administration of antibiotics,… and other contents.

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  • Fe3O4 magnetic nanoparticles were synthesized by hydrothermal and thermal decomposition methods. Particles synthesized by hydrothermal method were water soluble meanwhile one by thermal decomposition method were organic soluble. Structure, morphology and magnetic properties of magnetic powders and magnetic fluid samples were characterized.

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  • Preparation of a high purity powder is one of the most important steps in producting transparent MgAl2O4 ceramic. Additionally, the particles are required to have nanoscale scale, uniform size and least agglomeration, which make diffusion enhanced at grain boundary during sintering process, promote densification to achieve full dense bulk material.

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  • In this paper, a mechanically equivalent surrogate plate of UeMo dispersion fuel is presented using tungsten, substitute material of UeMo particle. A surrogate plate, composed of tungsten/ aluminum dispersion meat and aluminum alloy cladding, is manufactured with the same fabrication process with that of fuel plate except that a tungsten powder is used instead of UeMo powder.

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  • TiO2/sepiolite catalysts were prepared by suspension of titanium dioxide and support in solvent accompanying by calcination. The characterization of the obtained powder has been examined by some physical means including XRD, SEM, FT-IR, UV-Vis. The sepiolite support possesses fibrous structure. X-ray diffraction analysis pointed out that the TiO2 particles are firmly distributed on fibrous sepiolite matrix.

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  • In this study, MgO loaded TiO2 Degussa P25 powders were prepared by wet impregnation with difference in the amount of Mg content (i.e 0.5-10%). X-ray patterns studies have not proven the new phases in the MgO loaded TiO2 catalysts as well as BET and SEM studies have not shown the change of its particle size and specific surface area in compared with initial TiO2.

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