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COVER False-colored scanning electron microscopy image of
8 j }. [& T7 f- n) O* D9 fcarbonate-silica "flowers," each ~50 micrometers high. A vast array of similarly 4 ~# M: a U; L" N* }
complex, well-defined microstructures can be sculpted by manipulating conditions
) J1 ]3 A/ k& P6 E8 O2 ssuch as pH, temperature, and carbon dioxide concentration. With insight into c8 \" O/ t5 L; n5 B. l! _* m8 S
molecular growth mechanisms, these structures are dynamically steered toward - L% |- {- B; M% H: X. D( v( i
arbitrary, hierarchically assembled architectures. See pages 822 and 832, as well
; \: y3 J/ X1 S; C; S/ Ias a slideshow online. Image: Wim Noorduin and Joanna Aizenberg
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