Crystal modification agent

Function Humectant texturizing agent stabilizer thickener crystal modification agent. 

The second approach is thru the modification of the Compn B formulation and the elimination of cast charge defects, especially at the interface with the projectile base. Studies have centered primarily in the utilization of crystal control agents — polymeric materials, HNS, etc, the finish on the interior of the projectile, and on controlled loading cooling processes... 

Takahashi, T. (2002). Crystal modification in polypropylene fibers containing P-form nucleating agent. Sen Gakkaishi, Vol.58, No. 10, pp.357-364. 

Photoelectrical properties of phthalocyanine powders and their films on a variety of substrates have been the object of numerous investigations. Photoconductivity is affected by the nature of the phthalocyanine substrate as well as its crystal modification, doping agents employed [201], and by the way the... 

Crystal modifications of two steroids-androsterone (male sex hormone with functional prostate property) and beclomethasone dipropionate (important for pharmaceutical industry, an anti-inflammatory agent)-have been characterized by solid-state NMR. The C CP MAS NMR spectra of androsterone were assigned by comparison with... 

Although the antibacterial spectmm is similar for many of the sulfas, chemical modifications of the parent molecule have produced compounds with a variety of absorption, metaboHsm, tissue distribution, and excretion characteristics. Administration is typically oral or by injection. When absorbed, they tend to distribute widely in the body, be metabolized by the Hver, and excreted in the urine. Toxic reactions or untoward side effects have been characterized as blood dyscrasias crystal deposition in the kidneys, especially with insufficient urinary output and allergic sensitization. Selection of organisms resistant to the sulfonamides has been observed, but has not been correlated with cross-resistance to other antibiotic families (see Antibacterial AGENTS, synthetic-sulfonamides). 

Crystal structure modification, in smart materials, 22 707 CS (riot control agent), 5 823-824 CS2, formation in the Claus furnace, 23 605. See also Carbon disulfide C-scan images, 17 424, 429 Cs isotopes, decay of, 21 303-304. 

Various ways to modify ZSM-5 catalyst in order to induce para-selectivity have been described. They include an increase in crystal size (15,17,20) and treatment of the zeolite with a variety of modifying agents such as compounds of phosphorus (15,18), magnesium (15), boron (16), silicon (21), antimony (20), and with coke (14,18). Possible explanations of how these modifications may account for the observed selectivity changes have been presented (17) and a mathematical theory has been developed (22). A general description of the effect of diffusion on selectivity in simple parallel reactions has been given by Weisz (23). 

Other Crystalline Forms.—In addition to the foregoing crystalline modifications of sulphur, at least two others have been observed. When using boiling sulphur as the heating agent in the outer jacket of a Victor Meyer vapour density apparatus, Friedel,2 in 1879, noticed the formation of very unstable triclinic crystals inside the upper part of the jacket these crystals rapidly underwent change into ordinary octahedral sulphur, Various crystalline stuctures may be observed when sulphur condenses in droplets on a glass jdate and solidifies.3 Such crystals axe also unstable. 

---