CHEM 204 Lecture Notes - Base Pair, Collagen, Dna Origami
15 Jul 2013
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Document Summary
Coil entropy: to see how random walks of diffusion apply to polymers, can be described well as random walks, to learn how to define the entropy of a random walk coil. Polymers behave differently than molecules, and all our impressive features like skin, bone, muscle, dna are all polymers. A simple model for polymers is n segments of size a. N is extremely variable but a is usually 3-10 angstroms. Coil entropy s =-3/2 [ r2/r02 + r02/r2 ] r= the raduis we want to know the entropy of. R0= most likely random walk of radius a . Using the rule doesn"t give us the perfect length, real coils are actually longer. Diffusion theory works well for gas molecules, but polymer coils can"t be in the same space at different times. No crossing over is allowed; it is a self avoiding walk. A balance between entropy and enthalpy is the base of all self-organizing material.
