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cent reaction conditions. The mass yield is assigned as m(t)/m(¥) The data are fitted into the three-parameter Avrami equation (see text, Eq. 1) using Microcal Origin 4.1 software package on a PC-compatible computer.AFM experiments were performed using a Digital Instruments Nano-Scope III with a phase-extender module, operating in tapping mode. Samples were prepared on a graphite substrate by placing the substrate (for a few seconds) in the synthesis solution with a reactant mole ratio of 100 H 2 O : x HCl : 0.11 CTACl : 0.13 TEOS (for fiber, x = 7; for gyroid, x = 3.5), with subsequent gentle washing in distilled water. The A+B feedback signal was~3 V, whereas the root mean square (rms) signal was set at 0.3 V. Feedback gain parameters were set between 1 and 2 for both integral and proportional gains. UltraSharp NT-MDT silicon cantilevers SCS11 (resonance frequency is 300±380 kHz) were used throughout the study. The drive amplitude was set between 600 and 800 mV, whereas the working frequency was chosen to be~360 kHz. The D scan head (maximum scan area is 12.5´12.5 mm 2 , z-sensitivity is 9 nm/V) was employed throughout the study. Scan rates of~1 Hz were chosen.TEM experiments were performed using a Philips 430 microscope operating at 100 kV with 100 000´magnification. The samples were prepared by dipping a carbon-coated copper TEM grid into the aqueous solution with a mole ratio of 100 H 2 O : x HCl : 0.11 CTACl : 0.13 TEOS (for fiber, x = 7; for gyroid, x = 3.5). The excess solution was then blotted off from the grid and air dried. The white and black amorphous-like regions are probably adventitious surfactant and silicate residues, respectively, that had been incompletely removed from the seed during the blotting step.

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