Whether you're looking for spherical silica powder or silica micropowder, there are some things you'll want to consider before buying. The two materials are both known for their flowability and particle-size distribution, but they're also very different.
Flowability of spherical silica powder
Flowability of spherical silica powder is not well characterized. There are two reasons for this. First, the aggregation of the microparticles prevents production of the desired silica powder. Second, the size of the microparticles is not uniform and can vary, which results in different flowability properties.
In this study, we investigated the influence of particle size, particle diameter, and surface modification on the flowability of EMC. Moreover, we measured the flowability of the external additive-mixed toner.
We analyzed the flowability of the spherical silica powder under various compressibility conditions, including compression in a rotating drum, flow through an orifice, and compression in a shear cell. We used an external additive-mixed toner with an average particle size of 7 um. We performed flowability measurements in a sample mill.
The results of this study showed that the flowability of EMC improved with the filling of silica. In particular, the melting viscosity decreased with increasing shear rate in the high shear rate range. The particle size was also an important factor in the flowability of EMC.
Flowability of hydrophobic spherical silica microparticles was significantly improved compared to that of hydrophilic spherical silica microparticles. The basic flowability energy of the hydrophobic spherical silica was less than 500 mJ. This can be beneficial in a variety of applications, including improved coating properties, cosmetic products, and synthetic resins.
In addition, surface modification can drastically improve the flowability of powders, especially those relevant to industrial applications. For example, the surface treatment method disclosed in patent reference 12 is used to treat silica microparticles with a ketone-based solvent. The ketone-based solvent forms a liquid film that holds the particles in place and prevents dispersion. In addition, the fineness of the powder agglomerates increases the adhesive forces between the particles, thereby improving the flowability.
In addition, we found that the surface-treated spherical silica microparticles can be hydrophobically treated with an alkyltrialkoxysilane compound. These hydrolyzable groups are derived from the partial hydrolysis-condensation product of tetraalkoxysilane. These silanol groups are large and present at the surface of the microparticles.
Flowability of hydrophilic spherical microparticles was also improved by treating them with a silazane compound. This compound is a monofunctional silane compound with a very low charge quantity.
Particle size distribution in spherical silica powder
Various methods are employed to generate submicrometer-sized silica spheres. In addition to agglomeration, particle size distribution also plays an important role in the synthesis process. This article demonstrates the effect of different catalysts and particle size distribution on silica synthesis.
The starting material of a silica aerogel powder may be crystalline silica, quartz, or fused silica. The starting silica powder is then fed to a burner flame to melt and spheroidize. However, this method has some disadvantages such as high process cost and long processing time.
One method involves using glycerol to stabilize the silica spheres. This method produces submicrometer-sized silica spherical particles with a narrow particle size distribution. This method is suitable for the synthesis of silica aerogel powders due to its fast synthesis time and short duration of solvent exchange processes. Compared to the traditional silica synthesis process, the glycerol method produces larger mean particle size and lower porosity.
Another method involves using oxidative combustion of non-halogenated siloxane as an auxiliary flame in the production process. This method increases the flame temperature, which facilitates spheroidization. Nevertheless, the oxidative combustion of non-halogenated gas can produce more heat than the theoretical melting of the starting silica powder. The result is a lower thermal expansion coefficient and improved thermal conductivity. This method also allows for better thermal energy efficiency of the silica spheres.
In addition to the glycerol method, oxidative combustion of acetic acid and isopropanol was also used to produce submicrometer-sized silica-ethyl acrylate spheres. This method produces particles with a larger mean particle size and a narrow size distribution. This method is suitable for the production of spherical silica aerogel powder.
The effect of different particle size distributions on the agglomeration process was also examined. Besides varying the particle size, the amount of water also affects the dispersion of partially condensed product. The larger the amount of water, the more difficult it is to obtain silica gel with a uniform particle size.
Particle-size distributions of five powders were collected using three different instruments. The particle size distributions of the five powders were as follows.
Comparison with well-known brands in spherical silica gels
Generally, spherical silica gels are produced with tetra-ethylorthosilicate (TEOS), a polymer formed through sol-gel polymerization. This chemical modification involves binding functional groups to silanol groups on the silica gel surface. This tetra-ethylorthosilicate is then heated to gelation. This gel is used in normal-phase chromatography. During this process, the polymerization produces a reduction in volume.
There are various methods used for the manufacture of spherical silica gels. For instance, it can be obtained by a slurry with silica gel particles. Alternatively, the gel can be produced by a spray-drying method. However, the production process is fairly expensive. Alternatively, the gel can be produced from an aqueous solution. This method is used to accelerate relations.
The process can be carried out with deionized water. If the desired pore volume is not achieved, calcination treatment can be performed. However, this method is usually expensive. Alternatively, the production process can be carried out using compact equipment. The particle size of spherical silica can be measured using a scanning electron microscope or microtome.
The specific surface area of spherical silica is a good indicator of the quality of the material. The surface area of a spherical silica can range from 1 to 1,000 m2/g. However, this is usually not reflected in the price. In general, the pore volume of a spherical silica gel particle is around 0.6 cm 3 / g. However, the pore volume of a kugelformigen Kieselgel is around 0.66 cm 3 / g. This type of kieselgel has a uniform particle size and less likelihood of having rise and vertiefungen.
The size of the particles is typically around 30 to 100 mm. This range is considered to be the strongest. Particles with recessed surfaces are also likely to be formed. However, this is not a required property. A sample of 0.1 mm thick silica gel particles was viewed using a light microscope and a scanning electron microscope. The pore size was measured by MICROTRAC HRA-X100.
This invention also demonstrates the manufacturing process for kugelformigen Kieselgels. In addition, it shows how this type of kieselgel can be made using a relatively inexpensive process.
Characteristics of spherical silica gels
Various characteristics of spherical silica gel have been studied. These include pore volume, specific surface area, and compressive strength. They can be used for various applications such as adsorption, drying, catalyst support, column packing for chromatography and resin filler.
Typical commercial silica gel has a pore volume of 0.55 cm3/g and specific surface area of 750 m2 /g. The average particle size of the particles is between 0.4 and 8.0 mm. Using a scanning electron microscope, the surface of the particles were examined for any cracks or hollows. The surface of the particles were found to be smooth and free of cracks and hollows.
Spherical silica particles have high mechanical strength and adsorption capacity. In addition, spherical particles have a high internal porosity, which means that they have a large internal surface area. This allows for a more uniform column bed. They are also useful in thin-layer chromatography.
Spherical silica particles can be produced under a variety of conditions. These include the use of a non-polar solvent. Non-polar solvents may include liquid paraffin, hexane, and aromatic solvents. These solvents are preferably used in a ratio of between 1-100 parts by weight of the dispersion medium.
The relative humidity of the gas in contact with the particles is preferably between twenty and thirty percent. This is essential to suppress the formation of cracks. If the relative humidity is low, it is possible to obtain weak spherical particles. If the relative humidity is high, then the gelation rate may be inadequate.
In the water-glass process, spherical silica sol is produced by emulsifying an aqueous solution of the alkali-silicic acid series. In this process, water glass contains three to thirty percent by weight of silica. The quantity of water glass added to the dispersion medium is usually between 0.1 and 20 parts by weight. This ratio depends on the desired particle diameter of the spherical silica gel.
A spray method is commonly used to produce spherical silica gel. This method combines a polar solvent and an alkali-silicic acid series. The alkali-silicic acid series contains Na2 O. The polar solvent is used in a ratio of approximately one to ten parts by weight. This ratio can be adjusted to control the aeration rate.
Spherical Quartz Powder Price
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Spherical Quartz Powder Supplier
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