Aminophosphonic and Aminophosphinic Acids: Chemistry and by Valery P. Kukhar, Harry R. Hudson

By Valery P. Kukhar, Harry R. Hudson

Aminophosphinic and aminoposphonic acids, man made analogs to traditional amino acids, have attained a place of prominence in research--particularly in examine related to the amendment of physiological tactics in residing organisms.

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7 SAFETY When working with any material, safety considerations should be uppermost. There are several important precautions to take when working with ceramics. Toxicity of powders containing, for example, Pb, Cd, or fluorides should be known. When shipping the material, the manufacturer supplies information on the hazards associated with their product. It is important to read this information and keep it accessible. Some standard resources that give information about the toxicity of powders and their “acceptable” exposure levels are given in the References at the end of the chapter.

This property becomes evident at high temperatures, when it undergoes viscous deformation. Glasses are clearly special ceramics. We may crystallize certain glasses to make glass-ceramics such as those found in Corningware®. , making it into a ceramic). We stand by Kingery’s definition and have to live with some confusion. We thus define ceramics in terms of what they are not. It is also not possible to define ceramics, or indeed any class of material, in terms of specific properties. 4 ▪ We can’t say “ceramics are brittle” because some can ▪ ▪ be superplastically deformed and some metals can be more brittle: a rubber hose or banana at 77 K shatters under a hammer.

The purpose of this section is to remind you that although our subject is old it is also quite young, and many of the innovators never thought of themselves as ceramists. 1 Which of the following materials could be classified as a ceramic. Justify your answer. (a) Solid argon (Ar); (b) molybdenum disilicide (MoSi2); (c) NaCl; (d) crystalline sulfur (S); (e) ice; (f) boron carbide (B4C). 2 Is silicone rubber (widely used as a caulking material in bathrooms and kitchens) a ceramic or a polymer? Explain your reasoning.

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