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. 2017 Jan 23;7:41327. doi: 10.1038/srep41327

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) Time-lapse series of video images showing blue light-induced transformation of a single trans-azoTAB:PAA particle into a multipodal trans/cis-azoTAB:PAA micro-architecture within 20 s; scale bars = 5 μm. (b) Optical microscopy high magnification image showing two multipodal trans/cis-azoTAB:PAA micro-architectures comprising straight-sided filamentous outgrowths connected through a central core, scale bar = 5 μm. (c) Optical (i) and corresponding polarized (ii) microscopy images showing birefringence associated with the core and an adjacent filament of a multipodal trans/cis-azoTAB:PAA structure, scale bars = 5 μm. (d) Optical microscopy images showing simultaneous growth of straight-edged filaments from the corners of a single hexagonal platelet of trans/cis-azoTAB:PAA after exposure to blue light for (i) 10 s and (ii) 20 s to produce a discrete multipodal architecture; scale bars = 5 μm. (e) Time-lapse series of confocal fluorescence microscopy images of a single trans-azoTAB:PAA microparticle containing Cy5-ssDNA before (i) and after exposure to blue light for 10 s (ii), 45 s (iii) and 80 s (iv); scale bars = 5 μm. (f) Plots showing time-dependent increases in filament length (L_f) under blue light (turned on at t = 0) at varying light intensities (I/I_max). (g) Plot showing time-dependent changes in filament length (L_f) under repeated cycles of dark and blue-light irradiation (marked as white and blue regions, respectively).