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Jeong, Kwang-Un,Jang, Ji-Hyun,Kim, Dae-Yoon,Nah, Changwoon,Lee, Joong Hee,Lee, Myong-Hoon,Sun, Hao-Jan,Wang, Chien-Lung,Cheng, Stephen Z. D.,Thomas, Edwin L. Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.19
<P>Combining the physical principle of actuators with the basic concept of photonic crystals, colour-tunable three-dimensional (3D) photonic actuators were successfully fabricated. By controlling the <I>d</I>-spacings and the refractive index contrasts of the self-assembled 3D colloidal photonic crystals, colours of the photonic actuators were tuned. Various shapes of these 3D actuating objects were constructed by transforming the programmed 2D structures <I>via</I> bending, twisting and folding mechanisms. These 2D structures were first programmed by breaking the symmetry. The selective swellings were then applied as driving forces to control the shapes and colours of the photonic actuators. Scroll photonic actuators had been first demonstrated by bending the traditional 2D cantilever structure (K.-U. Jeong, <I>et al.</I>, <I>J.</I><I>Mater.</I><I>Chem.</I>, 2009, <B>19</B>, 1956). By breaking the symmetry of a cantilever structure perpendicular to its long axis, polypeptide-/DNA-like 3D helical photonic actuators were obtained from the programmed 2D structure <I>via</I> twisting processes. Both left- and right-handed scrolls and helices with various colours can be achieved by changing the polarity of solvents. Different types of 3D actuators, such as cube, pyramid and phlat ball, were also demonstrated <I>via</I> the folding mechanism. The reversible 3D photonic actuators transformed from the programmed 2D structures <I>via</I> the bending, twisting and folding mechanisms may be applied in the field of mechanical actuators, and optoelectronic and bio-mimetic devices.</P> <P>Graphic Abstract</P><P>Reversible colour and shape tunable photonic actuators were constructed by transforming the programmed 2D structures to the 3D objects <I>via</I> bending, twisting and folding mechanisms. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm03631e'> </P>
The biaxial lamello-columnar liquid crystalline structure of a tetrathiafulvalene sanidic molecule
Kim, Dae-Yoon,Wang, Lei,Cao, Yan,Yu, Xinfei,Cheng, Stephen Z. D.,Kuo, Shiao-Wei,Song, Dae-Hyun,Lee, Seung Hee,Lee, Myong-Hoon,Jeong, Kwang-Un The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.32
<P>A macroscopically oriented lamello-columnar mesophase was obtained from a newly designed and synthesized symmetric tetrathiafulvalene-based molecule (symTTF11) containing four flexible alkyl chains chemically attached to the periphery of TTF mesogens (L. Wang, <I>et al.</I>, <I>J. Mater. Chem.</I>, 2011, <B>21</B>, 60), and its phase behaviors and physical properties were investigated by the combined experimental techniques. Based on the experimental results and structure analyses, it was revealed that there are two ordered columnar phases below the isotropic phase: a columnar crystalline phase (Col<SUB>K</SUB>) and a columnar smectic liquid crystal phase (Col<SUB>L</SUB>). From two-dimensional wide angle X-ray diffraction patterns of the macroscopically oriented samples, phase structures of Col<SUB>K</SUB> and Col<SUB>L</SUB> were identified and their biaxial molecular packing structures were also proposed. Since the assembled symTTF11 columns were well organized in the ordered layer structures over a macroscopic domain, symTTF11 exhibited a good charge carrier mobility in the Col<SUB>L</SUB> phase.</P> <P>Graphic Abstract</P><P>A newly synthesized symmetric tetrathiafulvalene-based molecule assembled into the lamello-columnar mesophase which may exhibit unique physical properties such as biaxiality and macroscopic polar order. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm32070c'> </P>
Colour-tunable spiral photonic actuators
Jeong, Kwang-Un,Jang, Ji-Hyun,Koh, Cheong Yang,Graham, Matthew J.,Jin, Kwang-Yong,Park, Soo-Jin,Nah, Changwoon,Lee, Myong-Hoon,Cheng, Stephen Z. D.,Thomas, Edwin L. Royal Society of Chemistry 2009 Journal of materials chemistry Vol.19 No.14
<P>Combining the multi-faceted environmental responsiveness of polymers with photonically active structures, we developed spiral photonic actuators which can reversibly change both shape and colour in response to the chemical environment.</P> <P>Graphic Abstract</P><P>Combining the multi-faceted environmental responsiveness of polymers with photonically active structures, we developed spiral photonic actuators which can reversibly change both shape and colour in response to the chemical environment. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b822980p'> </P>