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排序方式: 共有193条查询结果,搜索用时 15 毫秒
191.
Ryota Matsuoka Ryojun Toyoda Ryota Sakamoto Mizuho Tsuchiya Ken Hoshiko Tatsuhiro Nagayama Yoshiyuki Nonoguchi Kunihisa Sugimoto Eiji Nishibori Tsuyoshi Kawai Hiroshi Nishihara 《Chemical science》2015,6(5):2853-2858
One-dimensional coordination polymers (1D-CPs) tend either to dissociate into constitutive ligands and metals readily in solution, or to aggregate randomly and amorphously, which prevents them from widespread application. In the present research, 1D-CPs comprising bridging dipyrrin ligands and divalent metal ions (Zn2+, Ni2+, and Cu2+) are synthesized. A liquid/liquid interfacial reaction gives rise to single crystals suitable for X-ray diffraction analysis: A dichloromethane solution of the ligand is layered with aqueous metal(ii) acetate, such that the coordination reaction proceeds at the liquid/liquid interface. Isolated single fibers of the zinc coordination polymer may be exfoliated from the single crystal or bulk solid upon ultrasonication. Atomic force microscopy (AFM) detects the isolated fibers with lengths of more than several μm. The exfoliated 1D-CP wires feature good processability, realizing a conjugate with single-wall carbon nanotubes (SWCNTs), and a thin film on a transparent SnO2 electrode. The processed materials show electric conversion ability: For example, the modified SnO2 electrode serves as a photoanode for a photoelectric conversion system. The designability and tunability of the present 1D-CPs is demonstrated by a ligand modification, affording a luminescent property and an extension of the photoelectric conversion response to longer wavelengths. 相似文献
192.
Katsuya Nagayama Toshimasa Tanaka Kazuhiro Tanaka Hiroshi Hayami Shinichiro Aramaki 《Experiments in fluids》2008,44(5):843-850
Loach has a unique swimming style of bending the whole body and staying at the bottom of water. We studied the three-dimensional
flow field around and behind the loach using stereoscopic-PIV. We captured flow fields in horizontal and vertical plane, and
it seems loach leaves vortex tube arches. From the analysis of body motion and flow field, we propose flow structure with
vortex tube arches connected along the loach body. After being released, they are separated and flow away and dissipate.
This research article was submitted for the special issue on Animal locomotion: The hydrodynamics of swimming (Vol. 43, No.
5). 相似文献
193.
Tatsuhiro Takahashi Koichiro Yonetake Kiyohito Koyama Tokio Kikuchi 《Macromolecular rapid communications》2003,24(13):763-767
Polycarbonate (PC)/vapor‐grown carbon fiber (VGCF™) composite was prepared through melt compounding. It was unexpectedly found from differential scanning calorimetry (DSC) and wide angle X‐ray diffraction (WAXD) that the crystallization of PC was substantially accelerated in the presence of the ordered graphite surface of VGCF™. To make an aligned structure of PC crystallization together with the orientation of VGCF™, a magnetic field of 2.4 T was applied to the composite under several temperature profiles. The WAXD pattern revealed that not only dispersed VGCF™ but also matrix PC crystallization was magnetically aligned through the optimization of processes. The evidence for PC crystallization by VGCF™ with and without magnetic force is described.