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RISS 인기검색어
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- 저자 : ZHAOQIAN LI (검색결과 3 건)
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Qingping Luo,Chonghua Pei,Guixiang Liu,Yongjun Ma,Zhaoqian Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3
Cyclotrimethylenetrinitramine (RDX) is an energetic material (EM) from the class of cyclic nitroamine explosive widely used in military applications because of its excellent integral properties. Using bacterial cellulose (BC) gelatin with a three-dimensional network as a matrix, N,Ndimethyllformamide (DMF) as the solvent of RDX, the RDX nanostructured explosives were prepared through the solvent/nonsolvent method. It was found that the solvent had a great impact on the crystallization of RDX in the solution and the RDX content in the nanostructured explosive. The RDX particles in the nanostructured explosives smoothly coated to the nanofibers of BC gelatin network at high RDX concentrations, and the granularity distributions of RDX in the nanostructured explosives were very uniform in the range of 30–50 nm. The average contents of the RDX in the nanostructured explosives are greater than 83 wt.% when the RDX concentrations of the soaked solutions are greater than 0.20 g/mL. The average content is approximately 91 wt.% when the RDX concentration is 0.30 g/mL. The decomposition temperatures of the RDX nanostructured explosives were found to decrease approximately to 20 C and their mechanical sensitivities decreased greatly compared to that of raw micro-size RDX. It opens a useful way to prepare nanostructured explosives with high energy and low mechanical sensitivity.
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YONG DING,SONGYUAN DAI,Litao Jia,YANMEI MA,ZHAOQIAN LI,CHANGNENG ZHANG,JIANXI YAO,LIE MO,LINHUA HU,BING ZHANG,LING JIANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5
The sub-microspheres play multiple roles in enhancing dye adsorption and light-scattering toimprove the performance of dye-sensitized solar cells (DSSCs). In this work, the well-de¯ned TiO 2sub-microspheres with anatase granular-like nanocrystals are prepared in high yield by com-bining hydrolytic process with solvothermal treatment. Scanning electron microscopy (SEM) andtransmission electron microscopy (TEM) results indicated that plenty of rhombic nanoparticleswith ? 18 nm diameter having mutual contacts to neighboring nanoparticles were densely self-assembled into sub-microspheres, and abundant mesopores existed in the whole sub-microsphereswith superior light scattering ability. The appropriate pore diameter and relatively high speci¯csurface area of the as-obtained sub-microsphere result in a higher dye adsorption. As expected, byusing the sub-microspheres as a scattering layer, a higher photovoltaic conversion e±ciency of10.15% is obtained for DSSCs.
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Fully implantable, battery-free wireless optoelectronic devices for spinal optogenetics :
Samineni, Vijay K.,Yoon, Jangyeol,Crawford, Kaitlyn E.,Jeong, Yu Ra,McKenzie, Kajanna C,Shin, Gunchul,Xie, Zhaoqian,Sundaram, Saranya S.,Li, Yuhang,Yang, Min Young,Kim, Jeonghyun,Wu, Di,Xue, Yeguang,F Ovid Technologies (Wolters Kluwer) - Lippincott Wi 2017 Pain Vol.158 No.11
<P>The advent of optogenetic tools has allowed unprecedented insights into the organization of neuronal networks. Although recently developed technologies have enabled implementation of optogenetics for studies of brain function in freely moving, untethered animals, wireless powering and device durability pose challenges in studies of spinal cord circuits where dynamic, multidimensional motions against hard and soft surrounding tissues can lead to device degradation. We demonstrate here a fully implantable optoelectronic device powered by near-field wireless communication technology, with a thin and flexible open architecture that provides excellent mechanical durability, robust sealing against biofluid penetration and fidelity in wireless activation, thereby allowing for long-term optical stimulation of the spinal cord without constraint on the natural behaviors of the animals. The system consists of a double-layer, rectangular-shaped magnetic coil antenna connected to a microscale inorganic light-emitting diode (m-ILED) on a thin, flexible probe that can be implanted just above the dura of the mouse spinal cord for effective stimulation of light-sensitive proteins expressed in neurons in the dorsal horn. Wireless optogenetic activation of TRPV1-ChR2 afferents with spinal m-ILEDs causes nocifensive behaviors and robust real-time place aversion with sustained operation in animals over periods of several weeks to months. The relatively low-cost electronics required for control of the systems, together with the biocompatibility and robust operation of these devices will allow broad application of optogenetics in future studies of spinal circuits, as well as various peripheral targets, in awake, freely moving and untethered animals, where existing approaches have limited utility.</P>
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