Coating powders preparation

All paint, gypsum, and natural stone samples were broken perpendicularly to the surface so as to produce rough surfaces. To avoid artifacts, most analyses were performed either on ultra-thin carbon-coated samples for the purpose of improving the conductivity or, if possible, on non-coated samples. Ultra-thin carbon-coated powder preparations were made from silicone-coated fillers. 

Chromium carbide is important in powder preparations designed for thermal spray apphcations of corrosion and wear-resistant coatings on tool and machine parts. Lower carbon carbides of chromium are important in hardfacing tods and electrodes for weld-apphed ovedays on machine wear surfaces. However, these carbides are usually formed in situ from Cr and C in the rod and not added as preformed carbides. The properties of Ci2C2 are hsted in Table 2. 

Oral pancreatic enzyme supplements are available as powders, uncoated or coated tablets, capsules, enteric-coated spheres and microspheres, or enteric-coated microtablets encased in a cellulose or gelatin capsule (Table 28-2). Microencapsulated enteric-coated products are not superior to recommended doses of conventional non-enteric-coated enzyme preparations. The quantity of active lipase delivered to the duodenum appears to be a more important determinant in pancreatic enzyme replacement therapy than the dosage form. GI side effects appear to be dose related but occur less frequently with enteric-coated products. 

Powder coatings were prepared by extruding stoichiometric quantities of methylene dianiline with epoxy resins varying only in branch concentration. More highly branched resins result in a more tightly cross-linRed thermoset network. 

In this section, we calculate the energy for the preparation of monolayer particle-coated powder. Firstly, the energy is calculated on the assumption that the pure electrostatic interaction works mainly on adhesion between particles (11). Second, the energy is calculated on the basis of the assumption that the electrostatic and van der Waals interaction work together (12). 

Ukita, K., Kuroda, M., Honda, H., and Koishi, M., Characterization of powder-coated microsponge prepared by dry impact blending method, Chem. Pharm. Bull., 37, 3367, 1989. 

Most of the samples being investigated by SEM in the field of pharmaceutical technology are powders prepared by different methods, granules, pellets, tablets, and films from coated tablets. The sample preparation of bulk materials includes the following steps ... 

Aritomi H, Yamasaki Y, Yamada K, et al. Development of sustained-release formulation of chlorpheniramie maleate using powder-coated microsponge prepared by dry impact blending method. J Pharm Sci Tech Yakukzaigaku 1996 56(1) 49-56. 

Oral pancreatic enzyme supplements are available as a powder, uncoated or coated tablet, capsule, enteric-coated sphere (ECS) and microsphere (ECMS), or enteric-coated microtablet (ECMT) encased in a cellulose or gelatin capsule (Table 39-8). Recommended dosages of microencapsulated enteric-coated products are not necessarily more effective than recommended dosages of the non-enteric-coated enzyme preparations. This is because a lesser quantity of lipase is usually administered at each meal with the enteric-coated preparations. 

Dense (powder and polymer ratio of 1 1) and porous (ratio of 5 1) 1-3 pm thick YSZ films were prepared on sapphire and Pt foil substrates and evaluated. The dense YSZ coatings (powder and polymer ratio of 1 1) appeared to be transparent after deposition (annealing temperature 400°C). The YSZ coatings (powder and polymer ratio of 5 1) were semitransparent. The coatings on both sapphire and Pt substrates were free of cracks as they were initially made and after the further high temperature annealing (up to 1,000°C). The microstructure of fracture cross sections of... 

Attenuated total reflectance (ATR) accessories are especially useful for obtaining IR spectra of samples that cannot be readily examined by common transmission methods. Such accessories are suitable for studying thick or highly absorbing solid and liquid samples, including films, coatings, powders, threads, adhesives, polymers, and aqueous samples. ATR requires only little sample preparation for most samples, it is one of the most versatile sampling techniques. 

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