The term micromeritics was given to the science and technology of small particles by J. M. Good flow properties of granules and powders are important in the. Describe what a derived property of a powder is and identify the important derived The unit of particle size used most frequently in micromeritics is the. Many powder products are shipped and used as blends of primary ingredients. . These rheological properties can be monitored by measuring the density of.
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Length-Number mean, d ln. Surface-length mean, d sl.
Porosity characteristics often are the key to product performance. Because the Elzone measures the volume of a particle, the data are little affected if the droplets change shape as they pass anx the orifice tube.
Micromeritics – Wikipedia
Lippincott Williams and Wilkins. These hydrocarbons are rich in hydrogen and do not contain sulfur or nitrogen. Suppose a powder sample is examined under microscope and the diameter of the particles are measured individually.
Physical characterization of pharmaceutical solids. Over-sized particles create voids piwder the bed, reducing efficiency due to remixing of the separated sample components. Volume-Surface mean, d vs. Materials science Physical chemistry.
For example, these data can indicate to a researcher if a process adequately reduces the bacteria population in drinking water. Elzone results can be used to determine shelf life, proper emulsification, and droplet size of a wide variety of emulsions including pharmaceuticals, foods, and lubricants. Surface and porosity information helps to determine curing and bonding procedures, ensure adequate green strength, and produce a final product of desired strength, texture, appearance, and density.
Film quality is related to the amount of encapsulated air in the starting beads.
Particle size of cement affects setting microemritics and strength characteristics of the finished concrete and cement. Rate of sedimentation in suspension and rate of creaming in emulsion is faster with larger particles. Pharmaceutical principles of solid dosage forms.
The porosity of print media coating is important in offset printing where it affects blistering, ink receptivity, and ink holdout. Density can be used to determine the quantity of entrapped air.
Particle size and surface area influence the release of a drug from a dosage form that is administered orallyrectally, parenterallyand topically. Nanotube surface area and microporosity are used to predict the capacity of a material to store hydrogen.
Also the particle size distribution influences gloss, texture, color saturation and brightness. Powder is released slowly through a funnel on a horizontal round surface. Too high a rate can be dangerous; too low a rate can cause malfunctions and inaccuracy. The surface area of propellants used in the manufacture of munitions directly affects the burn rate. The back-pressure of the packed bed within the column is a direct function of the size of the channels through the bed and, micromeritids, the size rheologh of the column packing material.
The term micromeritics was given to the science and technology of small particles by J. The term was created by J. With knowledge of the dry powder and suspending liquid densities, the quantity of liquid in a slurry mixture can be calculated by measuring the density of the slurry.
The average diameter can be expressed in various ways. On the other hand, too little suspending fluid can lead to difficulty in transporting the slurry due to unfavorable rheological properties of the slurry when the solids content is too high.
To make sure that each batch meets specifications, the sample must be analyzed as a volume weight and population number distribution. Knowledge of pore micromeritice, total pore volume, and pore size distribution is important for quality control of industrial adsorbents and in the development of separation processes. Refers to particles having average surface area. Most of the pharmaceutical particles are not perfectly spherical.
Ammonia chemisorption Temperature-programmed desorption of ammonia Temperature-programmed decomposition of alkyl amines Temperature-programmed desorption of aromatic amines.
Hence, to make a stable suspension or emulsion the particle size must be controlled.
The characterization of these materials includes: Anything smaller than this but bigger than a molecule was referred to at the time as mivromeritics colloid but is now often referred to as a nanoparticle.