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many materials in this class are not soft to the touch. It is better defined as "mesoscopic matter" since the size of the basic constituents ranges from a few nano-meters to about one micro-meters (Fiugre 12-35a) - at the boundary between quantum and classical objects (Figure 12-35b). It is the properties and interactions of these mesoscopic structures that determine the macroscopic behavior of the material; the quantum |
Figure 12-35a Soft Matter |
Figure 12-35b Length Scale |
effect in the atomic or molecular scale are unimportant. Some examples for the soft matter are listed below. |
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Table 12-07a Colloids |
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Figure 12-35c Polymer Structure [view large image] |
in a liquid, these chains wind into little balls. In the presence of large numbers of chains and depending on the process of production, they can grow intertwined into a kind of solid like the plastics shown in Figure 12-35c, diagram d and Figure 12-35a. |
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Most polymers are in either amorphous or semi-crystalline forms. Depending on temperature, they can also exist in rubbery and melt states (Figure 12-35d). Thermo-plastics do not undergo chemical change in their composition when heated and can be |
Figure 12-35d Polymer Properties [view large image] | Table 12-07b Plastics Families [view table] |
moulded repeatedly. Thermosets type plastics can melt and take shape once; they stay solid after solidification. |
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Figure 12-35e Vesicle |
Figure 12-35f Emulsion |
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Figure 12-35g Emulsion Examples [view large image] |
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Figure 12-35h Liquid Crystal Phase |
Figure 12-35i Liquid Crystal Examples [view large image] |
between the molecules. Actually, in the meso-phase the 3-dimensional ordering has been reduced to 1 or 2-dimensional ordering (Figure 12-35h). Figure 12-35i shows the various types of liquid crystals. |
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Figure 12-35k Bio-molecules |
Figure 12-35l Organic Compounds [view large image] |
2. DNA and RNA are also polymers made from nucleotides (the monomers). In a biological system the combination of the mono-mers cannot be at random. It has to be very specific and coiled up into chromosomes, otherwise the organism would not survive. |