排序方式: 共有29条查询结果,搜索用时 797 毫秒
11.
A series of ethylene oxide-ethylene terephthalate segmented copolymers (EOET) weresynthesized and complexed with LiClO_4 to form some new polymer electrolytes. The EOET-LiClO_4 electrolytes exhibit not only high ionic conductivity, but also good mechanical strengthand toughness. The EOET 3400--25--LiClO_4 complex possesses the highest conductivity (4. 65×10~(-5)s·cm~(-1) at room temperature when the ratio [Li~+]/[EO] equals 1/16. The structures of these electrolytes were examined with FTIR analysis, X-ray diffractionand DSC thermograms, and the results of high ionic conductivity of the segmented copolymerswere discussed. 相似文献
12.
Zhao Siyuan Wu Xinjian Hu Xiaodan Chang Shuquan Zhang Haiqian 《Journal of Radioanalytical and Nuclear Chemistry》2020,324(1):359-365
Journal of Radioanalytical and Nuclear Chemistry - The Fe3+ diffusion in Fricke gel dosimeter, widely used for the measurement of accurate dose distributions in radiotherapy, results in a gradual... 相似文献
13.
Feng Chen Prakash Manandhar Md Salauddin Ahmed Shuai Chang Namuna Panday Haiqian Zhang Joong Ho Moon Jin He 《Macromolecular bioscience》2019,19(2)
In‐depth understanding of the biophysicochemical interactions at the nano–bio interface is important for basic cell biology and applications in nanomedicine and nanobiosensors. Here, the extracellular surface potential and topography changes of live cell membranes interacting with polymeric nanomaterials using a scanning ion conductance microscopy‐based potential imaging technique are investigated. Two structurally similar amphiphilic conjugated polymer nanoparticles (CPNs) containing different functional groups (i.e., primary amine versus guanidine) are used to study incubation time and functional group‐dependent extracellular surface potential and topographic changes. Transmembrane pores, which induce significant changes in potential, only appear transiently in the live cell membranes during the initial interactions. The cells are able to self‐repair the damaged membrane and become resilient to prolonged CPN exposure. This study provides an important observation on how the cells interact with and respond to extracellular polymeric nanomaterials at the early stage. This study also demonstrates that extracellular surface potential imaging can provide a new insight to help understand the complicated interactions at the nano–bio interface and the following cellular responses. 相似文献
14.
Concept of a high-resolution miniature spectrometer using an integrated filter array 总被引:1,自引:0,他引:1
A high-resolution miniature spectrometer has been demonstrated by utilizing a 128-channel integrated filter array, fabricated by using the combinatorial deposition technique, as a dispersive component whose passbands range from 722.0 to 880.0 nm with a bandwidth (or spectral resolution) from 1.7 to 3.8 nm and an average channel interval of 1.2 nm. The miniature spectrometer is smaller than 1 cm3 without any moving parts. This kind of miniature spectrometer has the advantages of very low payload, high resolution, and high reliability simultaneously, which are especially urgently needed for space applications. 相似文献
15.
Chang Shuquan Chang Ling Han Wei Li Zheng Dai Yaodong Zhang Haiqian 《Journal of Radioanalytical and Nuclear Chemistry》2018,316(1):209-219
Journal of Radioanalytical and Nuclear Chemistry - Novel Prussian blue/natural porous framework nanocomposites (PB@Apple, PB@Corn stalk and PB@Pomelo peel) were successfully produced in aqueous... 相似文献
16.
Yingying Li Xiang Dong Chuanwei Cheng Xuechao Zhou Peigen Zhang Junshan Gao Haiqian Zhang 《Physica B: Condensed Matter》2009,404(21):4282-4285
Large scale densely packed and vertically oriented ZnO nanorod arrays were grown on F-doped SnO2 (FTO) substrates through a simple hydrothermal synthesis route. Based on the arrays of hexagonal ZnO nanorod with size of 60100 nm in diameter, and 1.5 μm in length, a prototypical photoelectrical device was fabricated for ultraviolet detection, showing good reproducibility and a large photocurrent of around 6.71 mA at the applied voltage of 0.4 V. The large photocurrent and the ohmic I–V characteristics of the ZnO nanorods under the illumination could be ascribed to the decrease of the barrier height among the ZnO nanorods and the Schottky barrier between the nanorods and the Au electrodes and, in particular, to the accumulation of conduction electrons, resulted from the neutralization between photogenerated holes and negatively charged oxygen ions. The photoresponse curve is well fitted to an exponential curve with the relaxation time constant of 9 s in rising edge and 90 s in decaying one, representing the accumulation of conduction electrons. These well-aligned ZnO nanostructures of high quality could be easily fabricated by a cost-effective chemical route and used for constructing nanoscale devices with excellent performances. 相似文献
17.
Wei Zhang Kaikai Wang Xiaodan Hu Xiaohong Zhang Shuquan Chang Haiqian Zhang 《先进技术聚合物》2020,31(10):2127-2135
The irradiation of tumors in radiotherapy requires accurate 3D dosimetry. The Fricke 3D dosimeters, which were considered to be high potential of application in 3D dosimetry, suffer from a reduced temporal integrity of dose distribution caused by Fe3+ ions diffusion. To overcome the drawback, we firstly synthesized a kind of amphiphilic molecules with critical micelle concentration of 0.45 g/L and hydrophile‐lipophile balance value of 10, then prepared multiple emulsions by self‐assembling those molecules in Fricke solution under liquid paraffin, and finally obtained Fricke hydrogel embedded with the multiple emulsions. The diffusion coefficient of Fe3+ ions in the embedded Fricke hydrogel was measured to be 0.17 mm2/h. The hydrogel dosimeter exhibits considerable potential for use in dose verification applications. 相似文献
18.
Surface morphologies and microstructures of C60/Ag composite films were studied by atomic force microscope (AFM) and transmission electron microscope (TEM). The surface
roughness depended on the substrate temperature, and the transition of surface morphology of rough→smooth→rough was observed
when the substrate temperature increased from −50 to 120°C. Although the rms values are similar, the scaling properties of
the thermal roughing and the kinetic roughing surfaces are quite different. The relations between the scaling properties,
microstructures and roughing mechanisms are discussed based on the AFM and TEM results.
Project supported by the National Natural Science Foundation of China (Grant No. 59529204). 相似文献
19.
Development of Novel Graphene/g‐C3N4 Composite with Broad‐Frequency and Light‐Weight Features
下载免费PDF全文
![点击此处可从《Particle & Particle Systems Characterization》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Hualiang Lv Haiqian Zhang Guangbin Ji 《Particle & Particle Systems Characterization》2016,33(9):656-663
In this study, a novel graphene/g‐C3N4 microwave absorber is developed to solve the electromagnetic wave interference problem. Graphene/g‐C3N4 composite is synthesized by loading g‐C3N4 nanosheets on graphene through a simple liquid‐phase approach. High‐performance electromagnetic absorption performance can be achieved. The optimal reflection loss value is up to ?29.6 dB under a thin coating layer of 1.5 mm. At the same time, the corresponding absorption bandwidth of this composite can reach 5.2 GHz (12.8–18 GHz). Excellent electromagnetic absorption property may be attributed to the current attenuation theory which has been proven by replacing graphene with porous graphene or graphene oxide. The results reveal that free electron numbers and loading mass of g‐C3N4 on graphene play the key roles in the intensity of current attenuation and resistance value. 相似文献
20.
SiOx (x = 0- 2) films were deposited on BK-7 substrates by a low frequency reactive magnetron sputtering system with the oxygen flow rate (OFR) changing from 0 to 30 sccm. The samples were characterized by atomic force microscopy, spectrophotometer, and X-ray photoelectron spectroscopy. The extinction coefficient and refractive index decrease, while the optical transmittance increases with the increase of OFR from 0 to 17 sccm. The root mean square surface roughness has a maximum at 10 sccm OFR. The highest deposition rate is at 15 sccm OFR. Our results show that the films deposited at 20 sccm OFR are stoichiometric silica with relatively high deposition rate, low extinction coefficient, and low surface roughness. Therefore, a precise control of OFR is very important to obtain high quality films for optical applications. 相似文献