a) Structures of host and guest functionalized cross linked polyacrylamides for macroscopic self-assembly, b) β-CD-gel and Ad-gel system, c) β-CD-gel, t-Bu-gel, n-Bu-gel system, d) self-sorting α-CD-gel, β-CD-gel, n-Bu-gel, t-Bu-gel system. (Reprinted by permission from ref 27. Copyright 2011, Nature Publishing Group).