Papers by Keyword: Particle Size

Abstract: Six coal samples are oxidized by the sequence heating-up experiment. The oxygen consumption rates of six coal samples are calculated and analyzed at different temperature. And the general trend of the same particle size is discussed at different temperature. Then the oxygen consumption rates and particle size are handled by the dimensionless variable. The best-fitting curve of the relationship with dimensionless particle size and oxygen consumption rate is gained. Finally, the particle size influence function of experimental coal samples is determined at low-temperature oxidation.

Abstract: There are 6 group of experimental research to explore the relationship between shale ceramist concrete compressive strength and ceramic cylinder compressive strength, particle size, absorption time. The result shows that the strength of shale ceramist concrete is not only relevant with the ceramic cylinder compressive strength, but also relevant with the aggregate size, absorption time. For single graded particle size concrete, the strength of concrete decreased with grain size increasing. The longer time of ceramic absorption, the more sufficient the ceramist concrete strength development.

Abstract: This paper is to study factors that affect soaping color fastness of inkjet printing ink. Considering ink as a constant, discuss the affect of curing conditions on soaping fastness by altering curing temperature and curing time. Considering curing condition as a constant, study the affect of other factors on soaping fastness of ink, like particle size, the binder content and varieties of binder. The results show that: the soaping fastness is better when the curing temperature is 180°Cand curing time is 3minites; The smaller the particle size of ink is, the higher the soaping fastness is; the soaping fastness is well when the binder content of ink accounts for 20% of the total. The water-based polyacrylate and water-based polyurethane have the same effects on soaping fastness.

Abstract: Co0.6Mg0.4 Fe2O4 samples are prepared by auto-combustion method at various pH values of the solutions (sols). The precursors for the solids are different gels obtained from metal nitrates and citric acid by sol-gel process. The pH is varied by adding ammonia. The gels thus obtained are heated at 2000C and they exhibited self propagating combustion behavior. The residues are heated for one and half hours at 6000C. XRD analysis of the final solids revealed that after combustion the gel is directly transformed into nano sized cobalt magnesium ferrite particles. The samples are sintered at 6000C and higher temperatures. However, the samples sintered at 6000C have shown single phase nano particles. The ferrites formed have shown variation in particle size for varying pH values. FTIR of the samples supported the Octahedral and Tetrahedral site absorption values. The DC conductivity of the above samples has been studied and the results are discussed.

Abstract: Solid solution of m-dinitrobenzene (DNB) and 4-bromo-2-nitro aniline (BNA) in urea (U) were prepared based on the prior study of phase diagram. The formation of solid solution was studied using the powder X-ray diffraction techniques. The powder X-ray data were also used for the study of particle size and strain in solid solution. The vapor sorption and desorption studies revealed that the hygroscopic character of urea was modified in solid solution. The study for the second harmonic generation efficiency of urea, DNB, BNA and the solid solution was done with fundamental of Nd:YAG laser (1064 nm).

Abstract: Al2O3-glaze composite ceramic coating was prepared with enamel coating as transition layer and Al2O3 as hard antiwear facies on Q235A steel surface in this paper, and the effects of the particle size and volume fraction of ceramic coating on erosive wear behavior of composite coating were investigated. The results show that enamel performance of ceramic coating is better when the particle size of glaze is 16µm; the anti-wear property of composite ceramic coating is improved by adding Al2O3 particle, and the coating with 50μm particle size and 40% volume fraction particles, eroded at 45° impact angle at 15MPa pressure, is the best, which is 4.2 times than that of the enamel coating without Al2O3.

Abstract: There is an increasing concern about environmental problems associated with the rising emissions of CO₂, NO_x and SO_x due to the use of fossil fuels. Thus, renewable energy based on biomass could contribute to relieve the environmental and energy problems. Biomass energy conversion covers the processing of industrial and agricultural wastes, taking advantage of materials that would be discarded. In this work, tobacco residue characterization is studied; the material is a waste of tobacco industry. Values of true density were inferred for three different ranges of particle sizes and particles size and shape were studied for the three set of particles using dynamic digital image processing. The results show differences in physical characteristics of the biomass, varying the particle size.

Abstract: Electrorheological uids (ER) are commonly known as suspensions composed of semiconducting particles dispersed in insulating oil that respond to electric fields by gelling. The increase in suspension viscosity on application of the field is typically rapid and reversible and as a result, the ER response is amenable to applications where real time control of stress transfer properties is required. Ferroelectric particles are interesting in this application due to the presence of spontaneous polarization and high dielectric constant. Particularly, Bismuth Titanate (Bi₄Ti₃O₁₂ - BIT) is well-known as layer-structured ferroelectrics, so the typical morphology of these crystals is lamellar. Therefore, these particles dispersed in oil, in the presence of an electric field must produce an interesting ER response. Thus, BIT powders were prepared by the conventional solid state reaction method and the particles size was adjusted using ball milling process. Different ER fluids containing average particles size about 2.5 to 0.5 μm were dispersed in silicon oil about 10% vol and were submitted to AC and DC electric field. The relation between the BIT particles size with the ER response was observed, presenting an increase of the shear stress with the reduction on particle size.

Abstract: 2D Potts model Monte Carlo simulation was carried out on a square lattice to investigate the effects of varying the size of second phase particles on the Zener limit of grain growth, in two-phase polycrystals. Simulations were carried out on a 1000^2 size matrix with Q-state of 64, dispersed with second phase particles of various sizes and surface fractions, and run to stagnation. Different grain growth parameters such as mean grain size, largest grain size, fraction of second phase particles lying on grain boundaries, etc., were computed for the pinned microstructures. The pinned average grain size or the Zener limit increased with increase in particle size, as per the classic Smith-Zener equation. The Zener limit scaled inversely with the square root of the particle fraction for all particle sizes, while it scaled exponentially with the fraction of second phase particles lying on the grain boundaries (ϕ), for all particle sizes tested.

Abstract: The thermal shock resistance of ZrO₂/LaPO₄ composites containing LaPO4 with different particle size was investigated. Microstructure, mechanical properties and RIV para_{Subscript text}meter were evaluated and discussed. On the basis of theoretically calculated RIV values and experimental results, resistance to thermal shock damage would be more strongly favoured with composites containing LaPO₄ calcined at 1100°C for 1 h