1. Colloids Can “See” the Light
Theodore Hueckel, Stefano Sacanna 
Chem 
Volume 2, Issue 1, Pages (January 2017)
DOI: /j.chempr
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2. Figure 1 Artificial Phototactic Microswimmers
(A) SEM image showing a microfabricated “forest” of light-responsive nano-trees on a silicon wafer.
(B) A schematic of an active nano-tree shows its complex morphology and Janus character. TiO2 nanowires (yellow) are grown on one end of the silicon nanowires (pink), whereas platinum nanoparticles (black dots) are attached to the exposed silicon nanowire and act as electrocatalysts. On illumination, a photoelectrochemical reaction on the nano-tree surface generates charged species. This results in a self-generated electric field that propels the particle.
(C) Time lapse demonstrating the phototactic behavior of a suspension of artificial microswimmers (bottom) and, as a comparison, similar behavior for green algae E. gracilis (top).
Images are adapted by permission from Macmillan Publishers Ltd: Nature Nanotechnology (Tang et al.9), copyright 2016.
Chem 2017 2, 17-19DOI: ( /j.chempr )
Copyright © 2017 Elsevier Inc. Terms and Conditions