Poly-3BCMU薄膜上光栅的制备

报道了利用光致漂白现象在Poly－3BCMU薄膜上制备光栅的方法。对于不同条件下制备的光栅的衍射效率进行了测量。并建立了简单的模型，对实验结果进行了解释。     

He-Ne激光、紫外线诱变氧化亚铁硫杆菌及耐砷菌株的选育

对适合氧化亚铁硫杆菌(Thiobacilus ferrooxidans)特点的诱变方法进行了研究:把菌体制成无铁细胞悬液进行小剂量、多次数的诱变.氧化亚铁硫杆菌菌株S₁经多次紫外线和激光照射,并结合逐级驯化处理,最终选育出了优良耐砷菌株S_x,它能在含11g/LA_s2O₃的环境中生长,比出发菌株的0.7g/L提高了近14.7倍.在用该菌株进行浸矿的实验结果表明:浸矿能力良好,在同样是10%接种量时,浸出时间比出发菌缩短了一天,并且砷元素的浸出率由原先的76%提高至85.7%.     

Aggregation‐Induced Emission and Aggregation‐Promoted Photo‐oxidation in Thiophene‐Substituted Tetraphenylethylene Derivative

Aggregation‐induced emission combined with aggregation‐promoted photo‐oxidation has been reported only in two works quite recently. In fact, this phenomenon is not commonly observed for AIE‐active molecules. In this work, a new tetraphenylethylene derivative (TPE‐4T) with aggregation‐induced emission (AIE) and aggregation‐promoted photo‐oxidation was synthesized and investigated. The pristine TPE‐4T film exhibits strong bluish‐green emission, which turns to quite weak yellow emission after UV irradiation. Interestingly, after solvent treatment, the weakly fluorescent intermediate will become bright‐yellow emitting. Moreover, the morphology of the TPE‐4T film could be regulated by UV irradiation. The wettability of the TPE‐4T microcrystalline surface is drastically changed from hydrophobic to hydrophilic. This work contributes a new member to the aggregation induced photo‐oxidation family and enriches the photo‐oxidation study of tetraphenylethylene derivatives.     

Ag(Ⅲ)-聚六亚甲基双胍配合物的合成及抗菌性能表征

采用水溶液反应法,以不同粘均相对分子质量的聚六亚甲基双胍(PHMB)作为配体,合成出一系列稳定的由400 nm左右的小颗粒团聚而来的微米级四配位Ag(Ⅲ)-PHMB配合物,并对其进行表征证明了物质的结构与价态。通过抗菌活性实验发现,Ag(Ⅲ)-PHMB配合物的抗菌活性随着配体PHMB的粘均相对分子质量的升高而增大,随着粒径增大而减小。在低浓度条件下,微米级Ag(Ⅲ)-PHMB配合物的抗菌性能高于同等质量浓度的AgO、AgNO_3与PHMB;随着质量浓度的升高,微米级Ag(Ⅲ)-PHMB配合物与细菌的实际接触面积、缓释出的抗菌活性物质增长趋缓,因而抗菌活性升高趋缓。     

宽带准连续光纤激光在周期极化铌酸锂中倍频特性的研究

双包层光纤激光器和非线性光学材料(如周期性极化的铌酸锂晶体,PPLN)相结合,开辟了实用性非线性光学器件的一个新领域。研究了准相位匹配周期性极化反转铌酸锂晶体对宽带准连续光纤激光倍频的温度特性和频谱特性。在理论上,从准相位匹配相位失配关系出发,推导了晶体温度与抽运源中心波长的关系以及温度响应带宽,并和已报道实验结果进行了比较,二者符合得很好。此外,还推导了倍频周期极化铌酸锂晶体对抽运基频光源的响应谱线带宽。在实验上,采用长度20mm,极化周期6．5μm,厚度0．5mm的周期极化铌酸锂晶体光纤激光器准连续宽带输出进行了倍频,获得了在不同控制温度下的倍频光光谱,并对此进行了详细分析。     

A novel method to calibrate LiNbO_3-based polarization controllers

A fast and reliable method to calibrate LiNbO3-based polarization controllers （PCs） presented theoretically and experimentally. Particle swarm optimization （PSO） algorithm is used as an adaptive searching algorithm. Experimental results show that PSO algorithm is powerful in calibrating LiNbO3-based multistage PCs. Only less than one minute is spent for all stages of the PC to be calibrated thoroughly.     

Octaphenylbiphenylene and dodecaphenyltriptycene

Octaphenylbiphenylene, the expected dimer of tetraphenylbenzyne, has been prepared in low yield by diazotization of 3,4,5,6-tetraphenylanthranilic acid, and its X-ray structure has been determined. The X-ray structure of a second, abnormal dimer of tetraphenylbenzyne, 1,2,3,8,9,10-hexaphenyldibenzo[fg,op]naphthacene has also been determined; this is a saddle-shaped polycyclic aromatic hydrocarbon. 1,2,3,4,5,6,7,8,13,14,15,16-Dodecaphenyltriptycene, perhaps the most crowded triptycene derivative yet prepared, has been made by the reaction of tetraphenylbenzyne with 1,2,3,4,5,6,7,8-octaphenylanthracene, which in turn was synthesized in two steps from commercial starting materials. The X-ray structure of the dodecaphenyltriptycene nonabenzene solvate is a remarkable channel containing structure in which more than 50% of the unit cell volume is occupied by the benzene molecules.