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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>
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>
Thiuram, Thiazole, Sulfenamide계 가황촉진제가 실리카로 충진된 천연고무 복합소재의 가황 및 물성에 미치는 영향
나재운 ( Jae Woon Nah ),김광제 ( Kwang Jae Kim ),최창용 ( Chang Yong Choi ),김성민 ( Seong Min Kim ),박영훈 ( Young Hoon Park ),장미경 ( Mi Kyeong Jang ) 한국공업화학회 2011 공업화학 Vol.22 No.4
본 연구에서는 화학적 구조가 다른 thiuram계 tetramethyl thiuram disulfide (TMTD), dipenta methylene thiuram tertasulfied (DPTT), thiazole계 2-mercapto benzothiazole (MBT), 2,2``-dithiobisbenzothiazole (MBTS), sulfenamide계 n-cyclohexyl benzothiazyl- 2-sulfenamide (CBS), n-oxydiethylene benzo-thiazyl-2-sulfenamide (NOBS)를 사용하여 각각의 촉진제가 실리카가 충진된 천연고무의 가황 특성 및 기계적 물성에 미치는 영향을 비교 평가하였다. TMTD는 상대적으로 빠른 가류 속도 와 높은 최대 토크값(Tmax), 우수한 기계적 물성을 보였고 MBT, MBTS는 상대적으로 중간 정도의 가황 시간과 Tmax, 기계적 물성을 보였다. 마지막으로 NOBS는 느린 가황 시간과 낮은 기계적 물성을 나타낸 반면 중간 값의 Tmax를 나타 냈다. Various types of accelerators, thiuram (TMTD, DPTT), thiazole (MBT, MBTS), and sulfenamide (CBS, NOBS) are added into a silica filled natural rubber compound. Their effects on vulcanization and mechanical properties are investigated. TMTD showed the fastest vulcanization rate, the higer maximum torque (Tmax), and the excellent mechanical properties (300% modulus, tensilestrength, elongation). MBT and MBTS showed an intermediate vulcanization rate between thiuram and sulfenamide type and added ones, and also showed the lower Tmax and mechanical properties compared to that of other compounds. Finally, NOBS showed the slowest vulcanization rate and the lower mechanical property but the moderate Tmax.