i. Optical glass fibers and fiberglass for composite reinforcement have the same
ID: 1025277 • Letter: I
Question
i. Optical glass fibers and fiberglass for composite reinforcement have the same composition and are made in the same way (circle one): (2) true; false j. A glass is in thermodynamic equilibrium (circle one): (2) [true; false k. In a glass-ceramic, quenched glass is reheated, where the desired crystals and grow by (circle one): (2) [ripen; nucleate:; germinate L. The three main types of crystal growth are solution-grown, melt-grown, andgrown: (2 impurity; pressure; vapor m· The most important single crystal growth method for silicon is : (2) IVermeui/flame-fusion; Bridgman-Stockbarger, Czochralski]Explanation / Answer
(i) False: Optical fibers are mostly made up of silica whereas fiberglass is made up of marbles. We now that optical fibers are mostly used fiber optic communication whereas fiberglass are just used as normal reinforcement materials so they can not be prepared in similar way. In optical fibers more additive are added.
(j) False: Glasses are formed by liquids that can be supercooled or quenched into an amorphous state. While the structure, as revealed by diffraction experiments, remains quite similar to the liquid state, the mobility of the atoms or molecules decreases by many orders of magnitude. This loss of mobility makes it impossible to reach thermodynamic equilibrium.
(k) Nucleate: In ceramics there is need for controlled crystallization that's why some nucleation agent are added during the preparation.
(l) Vapour: Single crystals of high purity can be grown from the vapour by sublimation and chemical vapour deposition
(m) Vernueil/flame-fusion
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