Ultrafast formation of hydrated electrons in water at high concentration: Experimental evidence of the free electron

Using a time-resolved optical interferometric technique, we investigate the ultrafast primary events following the interaction of an ultrashort laser pulse with pure water in the TW/cm² regime. Because our method is sensitive to the quasi-instantaneous electron energy level position, we demonstrate that in contrast to the well-known low-intensity regime, where the free electrons are instantaneously captured by preexisting traps, in this new regime of excitation, free electrons are clearly observed, exhibiting a substantial contribution in the near IR. The delayed localization is attributed to the saturation of pre-existing cavities in the liquid by the large number of the excited electron states created.     

Key module for a novel all-optical network coding scheme

<正>We introduce a novel network-coding scheme that can be implemented in all-optical multicast networks.A simple and successful module based on the all-optical XOR gate is designed to realize the network coding scheme.The module is a key hardware component in realizing the proposed scheme.The working principle and the experimental results of the module are also presented.Experimental results show that the function of the module is sufficient in satisfying the requirements of the proposed network coding scheme.     

聚合物PMMA/DR1薄膜棱镜的制备

本文研究了用光漂白方法制备ＰＭＭＡ／ＤＲ１聚合物光棱镜的方法，测量了这种波导棱镜对１．０６４μｍ光的ＴＥ模和ＴＭ模在波导内传播光束的方向改变，并从理论上对测量结果进行了分析。     

An efficient and green preparation of 5-aminophosphonate substituted pyrimidine nucleosides under solvent-free conditions

<正>An environmentally benign and highly efficient one-pot preparation ofα-aminophosphonates under solvent-free conditions was developed.By employing this method,5-aminophosphonate substituted pyrimidine nucleosides were synthesized in good to excellent yields starting from 5-formyl-2'-deoxyuridine,aniline and dimethylphosphite.     

Unlocking the Stereoselectivity and Substrate Acceptance of Enzymes: Proline-Induced Loop Engineering Test

Protein stability and evolvability influence each other. Although protein dynamics play essential roles in various catalytically important properties, their high flexibility and diversity makes it difficult to incorporate such properties into rational engineering. Therefore, how to unlock the potential evolvability in a user-friendly rational design process remains a challenge. In this endeavor, we describe a method for engineering an enantioselective alcohol dehydrogenase. It enables synthetically important substrate acceptance for 4-chlorophenyl pyridine-2-yl ketone, and perfect stereocontrol of both (S)- and (R)-configured products. Thermodynamic analysis unveiled the subtle interaction between enzyme stability and evolvability, while computational studies provided insights into the origin of selectivity and substrate recognition. Preparative-scale synthesis of the (S)-product (73 % yield; >99 % ee) was performed on a gram-scale. This proof-of-principle study demonstrates that interfaced proline residues can be rationally engineered to unlock evolvability and thus provide access to new biocatalysts with highly improved catalytic performance.     

Multi-functionalized single-walled carbon nanotubes as delivery carriers: promote the targeting uptake and antitumor efficacy of doxorubicin

Journal of Inclusion Phenomena and Macrocyclic Chemistry - As one of carbon-based nanomaterials, single-walled carbon nanotubes (SWCNTs) are widely regarded as potentially potent drug delivery...     

石墨烯三维结构组装体制备及光热水蒸发和水处理研究进展

水资源短缺是世界长期面临的问题,当前全球80多个国家的约15亿人口面临淡水不足,其中26个国家的3亿人口完全生活在缺水状态。近年来,人们开发了新型太阳能界面水蒸发材料和技术,能够利用高效光热材料吸收太阳能转化为热能,实现大量的、快速的水蒸发,冷凝后收集便得到洁净水,是一种高效、绿色、低成本水处理和解决水资源短缺的方法。石墨烯三维组装体材料的物理和化学性质优异,光热转化效率高,同时其太阳光吸收率高,内部微纳孔道丰富,具有良好的水传输通道,表面水蒸发面积大,在太阳光照射下能够实现超高的水蒸发速率,在光热水处理方面展现了巨大的科学研究意义和实用价值。本文将综述石墨烯三维组装体的制备及光热水处理方面的研究进展,包括石墨烯三维结构组装体制备方法,其光热水蒸发性能,总结了石墨烯三维结构组装体在光热水蒸发及水处理方面的应用,最后分析了石墨烯三维结构组装体光热水处理面临的问题及展望。     

烯碳纤维基能源器件的研究进展

纤维状能源器件的研究极大地推动了可穿戴电子设备的快速发展。烯碳纤维主要包括碳纳米管纤维和石墨烯纤维,其微观组成单元具有独特的碳碳共轭分子形态,宏观结构具有高度可调控性,表现出高的比强度、优良的导电性和导热性、以及良好的机械柔韧性等,被广泛应用于先进能源器件的研究和开发,有效促进了柔性可穿戴电子器件的发展。本文综述了烯碳纤维基能源器件包括能量转换和储能器件等的研究和应用进展,具体介绍了烯碳纤维基太阳能电池、湿气发电机、热电发电机、超级电容器以及电化学电池等的最新成果,重点讨论了烯碳纤维基能源器件的制备方法和可穿戴应用,分析了烯碳纤维基储能及能量转换器件面临的问题和挑战,期望能够为未来高性能纤维基可穿戴能源器件的发展提供有价值的研究思路。