Recently, researchers have discovered unexpected bumps in the detection rate curve of yet another steganographic scheme (YASS). We refer to this abnormal phenomenon as non-monotonic security performance. This paper fi...
详细信息
Quantitative structure activity relationship (QSAR) models for prediction of the ECinf50/inf of the peroxisome proliferator-activated receptors (PPARs) have been developed basis on the linear heuristic method(HM). Mol...
详细信息
Ultraviolet (UV) photodetectors (PDs) based on ZnO micro/nanowire (MNW) networks with Pt contacts have been fabricated on glass substrates. The PDs exhibited a high photosensitivity (5×10~3) for 365 nm UV light w...
详细信息
Ultraviolet (UV) photodetectors (PDs) based on ZnO micro/nanowire (MNW) networks with Pt contacts have been fabricated on glass substrates. The PDs exhibited a high photosensitivity (5×10~3) for 365 nm UV light with a fast recovery time (0.2 s) at a reverse bias voltage of 2 V. The light induced modulation of Schottky barrier and MNW–MNW junction barrier was employed to account for the results. It was also observed that the PD had a high on– off ratio of 800 without external bias. The photovoltaic effect was proposed to explain the self-powered phenomenon.
Proton conducting materials having reasonable proton conductivity at low humidification conditions are critical for decrease in system complexity and improvement of power density for polymer electrolyte membrane fuel ...
详细信息
Proton conducting materials having reasonable proton conductivity at low humidification conditions are critical for decrease in system complexity and improvement of power density for polymer electrolyte membrane fuel cells. Thus, construction of newmaterials to improve the efficiency of proton transportation is one of the very important research areas. Herein, we described a new type of proton conductors based on polyelectrolyte brushes which were synthesized through in situ free radical polymerization either from metal oxide nanotubes. The grafting density and grafted chain length can be precisely controlled by controlling the polymerization parameters. The large density of proton conducting moieties and well-distribution of ionic groups makes the free volume inside the materials relatively small and reduces the proton transporting distance. Accordingly, proton conductivity is rather less humidity-dependant. However, both grafting distance and molecular weight of surface-attached polymer electrolyte chains exhibit significant influence on proton conductivity of the formed polymer brushes. With the decrease in average grafting distance of surface-attached polymer chains, the proton conductivity of the synthesized polymer brushes initially increases and then decreases after reaching a maximum value. Non-monotonic behavior of proton conductivity with the increase in molecular weight is also observed. Under optimized conditions, the proton conductivity values of the formed polymer electrolyte brush reach 0.095 Scm~(-1) under 100% relative humidity and 0.01 Scm~(-1) under anhydrous conditions at 140 ℃. Nevertheless, this kind of channelless material has the potential to low-humidity polymer electrolyte membrane applications. This work was financially supported by the National Natural Science Foundation of China (No. 51372192) and Open Foundation from statekeylaboratory of advancedtechnology for materials Synthesis and processing of WHUT (2014-KF-14).
The biocompatibility of the cellulose nanowhisker (CNW) from cellulase hydrolysis was evaluated in vitro for potential applications in drug delivery system. The assessments were comprised of cytotoxicity analysis and ...
详细信息
An overview of current PCE compositions and synthesis methods is provided, followed by novel applications for PCEs including C-S-H-PCE nano-composites and a description of still unresolved challenges for PCE *** addit...
详细信息
An overview of current PCE compositions and synthesis methods is provided, followed by novel applications for PCEs including C-S-H-PCE nano-composites and a description of still unresolved challenges for PCE *** addition, the functionality of chemical admixtures in specific applications for low-carbon cements and concrete systems is *** action mechanisms of retarders and the recycling system of sludge water by using retarder are ***, the influence of fluoride ion and the effectiveness of PCE polymers in blended cements and the effect of non-adsorbed polymer are *** the impact of special interface modifying materials, of a refined pore structure and of chemical admixtures, particularly shrinkage-reducing agents, is *** article concludes that more accurate quantitative micro-analytical methods and modeling tools will be needed to obtain a holistic understanding of factors affecting the microstructure of concrete, with the final goal of achieving a more durable concrete.
暂无评论