Papers by Keyword: Particle Diameter

Abstract: In the present study, a plasma spray coating for titanium particles was studied using software simulations. The governing equations to solve the velocity and temperature distributions of plasma flow and titanium particles considered the effects of electric/magnetic inductions. Seven controlling factors were included in order to investigate their effects on the velocity and temperature of titanium particles colliding with the specimen substrate and the colliding scope of the effective particle depositions. The velocity and temperature distributions of the plasma flow predicted in the present study were expressed in a power form. The results predicted by the present governing equations were thus trustworthy. In general, either a small particle diameter in collaboration with a low electric potential or a large particle diameter in collaboration with a high electric potential is advantageous for a high melting and boiling points.

Abstract: In analytical chemistry, particle diameter is very important during the sample preparation. A model is presented describing the effects of particle diameter on the content of analyte determines the size of the particle; and the particle size determines the weight of samples and relative standard deviation in the results. This new methodology for the optimisation of physical sample preparation is applied for the first time. Based on this relationship, we can find an extensive application in analytical chemistry.

Abstract: The diameter and the shape of particle were the important characteristics of solid particle. The purpose of this paper was to observe the shape and to measure the diameter of bulk material particles included ferroferric oxide, silicon dioxide and sodium chloride, and to explore the most suitable calculation method of these bulk material particles. The studied results showed that the calculation formulas of the equivalent diameter of equal volume sphere and the equivalent diameter of equal surface area sphere were both applicable to the particle with micro-shape approximated to spheroid, such as ferroferric oxide particle. And the formula of the equivalent diameter of equal surface area sphere was more applicable to the particle with micro-shape approximated to regular tetrahedron, such as silicon dioxide particle. As for the particle with micro-shape approximated to regular hexahedron, such as sodium chloride particle, the formula of the equivalent diameter of equal volume sphere was more applicable.

Abstract: The aluminum salt flame retardants powders are prepared with ammonia and aluminum chloride hexahydrate by chemical precipitation method under different conditions. The effect of the reaction temperature, ammonia concentration and aluminum ion concentration on the particle diameter are systematically studied. In addition, the effects of additions on the particles diameter of aluminum salt flame retardants are also explored by adding different additions in the experiments. On the basis of the experimental results, the process conditions synthesizing the minimum particle diameters are obtained, which may provide the beneficial reference for inorganic flame retardant powders.

Abstract: The impact of the reaction temperature, ammonia concentration, aging time and molar ratio on the particle diameters of magnesium salt flame retardants have been systematically investigated through preparing magnesium salt powders under different conditions. Particle diameters are characterized by laser particle size analyzer, and the effect of different factors on the particle diameters is discussed, respectively. On the basis of the analysis, optimization parameters for synthesizing magnesium salts with the minimum particle diameters are found, which may be very helpful to the development of magnesium salt flame retardants

Abstract: Under the same operating mode, the flux of non-bulking MBR（1#） descends much faster than the flux of filamentous bulking MBR（3#）, mainly because the particles adhered to membrane 1# become smaller much more quickly，provided that spherical particles tend to be rushed off into the mixed liquid more easily than filamentous particles. The falling of particles diameter is caused by the decline of flux, which can be interpreted with the formulation for critical diameter and flux as well as Critical Flux Theory.

Abstract: By means of structure analysis, mechanical properties test and microstructure observation，structure of Ni and Ni/TiO₂ group particles have been obtained, the relationship among partic_{Subscript textSubscript text}le diameter，electric field strength and shear ratio of the properties of Ni/TiO₂ group core-shell particles ER fluid have been researched. It has been found that with increasing particle diameter，the shear stress of ER fluid decreased, and with increasing shear ratio，the shear stress of ER fluid increased for same diameter particle and composition ER fluid. At same time, the smaller of particle diameter, the higher of ER properties such as shear stress, but there is a critical value for shear ratio, when shear ratio is larger than critical value, the properties of ER is nearly a value for same composition ER fluid. Particles chain of ER fluid under certain electric field is different with diversity Ni group Particles.

Abstract: In this study, the microcapsule was prepared by emulsion crosslinking method, using trisodium trimetaphosphate (TSTP) as crosslinking agent. The microcapsule was named OMA-MPs because the mixture of Octenyl succinic starch ester(OSA-starch)，maltodextrin starch and arabic gum were used as raw material. Orthogonal experiment was used in this work to find the relationship between the small diameter of OMA - MPs and preparation factors. The better condition is that the small diameter of OMA-MPs technique was that the stirring rate 400 rpm, the materials concentration 15%, the crosslinking agent concentration 1%, and the volume ratios(w₂/w₁) 120:100. Due to the processing route without the use of toxic organic solvents, it is expected that these microparticles can be used as delivery vehicles for controlled release of food and drug.