The job of the materials engineer or any other

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Unformatted text preview: er engineer, is to select (or develop) the right material for each A camcorder also contains a large number of electronic com- component. ponents, including: (1) electrically conducting wires made from | v v 21 | e-Text Main Menu | Textbook Table of Contents pg022 [V] G6 7-27060 / IRWIN / Schaffer H A P T E 2 R ATOMIC SCALE STRUCTURES 2.1 Introduction 2.2 Atomic Structure 2.3 Thermodynamics and Kinetics 2.4 Primary Bonds 2.5 The Bond-Energy Curve 2.6 Atomic Packing and Coordination Numbers 2.7 Secondary Bonds 2.8 Mixed Bonding 2.9 The Structure of Polymer Molecules | v v C ak 12-24-97 pgm 1-14-98 QC1 | e-Text Main Menu | Textbook Table of Contents pg359 [R] G5 7-27060 / IRWIN / Schaffer rps 01-06.98 iq 01.20.98 QC rps MP M A T E R I A L S I N A C T I O N Bonding Forces are exerted between atoms and groups of atoms that are in near proximity. In many cases these forces are attractive in nature and the atoms group together through the formation of bonds. These bonds have different characteristics depending on the atoms or groups of atoms in question. The bond character determines the physical, mechanical, and chemical properties including the state of aggregation (in other words, gas, liquid, or solid) as well as the structure (for example, crystalline or amorphous) under a given set of conditions. The fact that the “valence” electrons in a piece of metal are not localized on individual atoms means that they are free to conduct electricity under an applied electric field. This accounts for the excellent electrical conductivity of metals. On the other hand, most polymers (typically consisting of carbon, hydrogen, and oxygen in various combinations) are rather poor conductors of electricity. We shall see that in the bonds that constitute polymers, the electrons are localized and not free to move. These materials thus are excellent insulators as a result of their bond character. An example of the way in which the bond character determines the structure and properties is found with carbon. It turns out that the bonds of carbon may have a different character,...
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This note was uploaded on 02/25/2013 for the course PHYS 2202 taught by Professor Sowell during the Spring '10 term at Georgia Institute of Technology.

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