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COVER False-colored scanning electron microscopy image of
/ j; V' ]' K2 R/ A7 G- H4 Y! Dcarbonate-silica "flowers," each ~50 micrometers high. A vast array of similarly ; N- _( z( c) F& D! f" T! u
complex, well-defined microstructures can be sculpted by manipulating conditions
8 S/ Z! l- f: b! `+ X" qsuch as pH, temperature, and carbon dioxide concentration. With insight into ) U4 z# u( f; t
molecular growth mechanisms, these structures are dynamically steered toward
2 g6 E2 s& g. m6 |4 [arbitrary, hierarchically assembled architectures. See pages 822 and 832, as well ) V9 t0 h; Y7 |4 ^! w7 M4 T" U
as a slideshow online. Image: Wim Noorduin and Joanna Aizenberg
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