In this study, mechanically strong hydrogels are synthesized by photopolymerization of 2‐vinyl‐4,6‐diamino‐1,3,5‐triazine, poly(ethylene glycol) methacrylate, and disulfide‐containing cross‐linker, N′N‐bis(acryloyl)cystamine. The bilayer hydrogel with distinct cross‐linking density is shown to self‐roll into a 3D tube, which could still be well reinforced by hydrogen bondings, upon exposing reductants such as 1,4‐dithio‐DL‐threitol (DTT) or L‐glutathione (GSH), because the redox‐induced cleavage of disulfide bonds results in the imbalanced internal shrinking stress between two layers. At an intracellular level of GSH, model L929 cells‐seeded bilayer gel sheet could curl up into a 3D tubular scaffold where the cells maintained good viability.
Nitrogen self-doped TiO(2) nanosheets with exposed {001} facets (ca. 67%) were synthesized by solvothermal treatment of TiN in a HNO(3)-HF ethanol solution and exhibited much higher visible-light photocatalytic H(2)-production activity than nitrogen doped TiO(2) microcrystallites with exposed {001} facets (ca. 60%) by a factor of 4.1. 相似文献
This Letter investigates the stabilization of three-dimensional chaotic systems in a finite time. Based on the finite-time stability theory, a control law is proposed to realize finite-time chaos stabilization of three-dimensional chaotic systems. Several illustrative examples with numerical simulations are studied by using the results obtained in this Letter. Study of examples shows that our control methods work very well in stabilizing a class of chaotic systems in a finite time. 相似文献
In recent years, fluorescent probes, as an analytical tool that can target and rapidly detect analytes, have been increasingly used for applications related to medical treatment, detection, and bioimaging. Researchers are interested in hemicyanine-based fluorescent probes because of their high quantum yield, tunable spectrum characteristics, absorption and emission in the near-infrared (NIR) region, and good photo-stability. The development of these dyes and their derivatives as NIR fluorescent probes for biological applications has advanced significantly in the last ten years. This review introduces processes for making hemicyanine dyes and the methodology for creating functional activity-based fluorescent probes. A variety of hemicyanine-based probes have been systematically developed for the detection of small biomolecules in various illnesses. Finally, the potential drawbacks of hemicyanine-based functional probes, and the prospects for future research and translation into clinical medicine, are also discussed. This study is intended to provide strategies for the development and design of novel fluorescence probes. 相似文献