Co3O4 Decorated Ti/TiO2 Nanotubes for Photogenerated Cathodic Protection of 304 Stainless Steel

The Co₃O₄ decorated TiO₂ nanotube arrays(NTAs) coatings are fabricated by the combination of anodization and impregna-ting methods. It is found that the introduction of Co₃O₄ can reduce the diffraction intensity of (101) plane of the TiO₂ and accelerate the separation of photogenerated electron/hole pairs. In addition, the open circuit potential(OCP) and the corrosion potential of 304 stainless steel(304SS) with or without Co₃O₄ decorated TiO₂ NTAs were measured under visible light, which indicated the 304SS coupled with Co₃O₄ decorated TiO₂ NTAs had better anticorrosion performance than that of the 304SS or the 304SS coupled with pure TiO₂ NTAs. The enhancement of the cathodic protection performance of the Co₃O₄ decorated TiO₂ NTAs can be ascribed to the matched energy levels and strong interaction between Co₃O₄ and TiO₂ NTAs, and the improvement of light absorption.     

Recent Process of Photo-responsive Materials with Aggregation-induced Emission

The research of photo-responsive materials, with changed absorption and emission under light stimulus, has drawn more and more attention due to their wide applications. However, most of them suffered from the notorious aggregation-caused quenching(ACQ) effect, which often led to the unconspicuous luminescent change in photo-responsive process. To solve this problem, the strategy of combining aggregation-induced emission(AIE) and photochromic properties was utilized, which largely enriched the phenomenon and application of photo-responsive materials. This short review summarized the recent progress of photo-responsive AIE materials with changed UV absorbance or PL phenomenon under UV-irradiation, including the types of molecular structures, internal mechanisms and the practical applications. Also, some outlooks were given on the further exploration of this field at the end of this paper.     

Recent Progress and Perspectives of Sodium Metal Anodes for Rechargeable Batteries

Sodium metal anodes have attracted significant attention due to their high specific capacity,low redox potential and abundant resources.However,the dendrites and unstable solid electrolyte interphase(SEI)of sodium anodes restrict the development of sodium metal batteries.This review includes the recent progress on the Na anode protection in sodium metal batteries.The strategies are summarized as modified three-dimensional current collectors,artificial solid electrolyte interphases,and electrolyte modifications.Conclusions and perspectives are envisaged for the further understanding and development of Na metal anodes.     

基于乙炔基-苯并噁嗪单元双重交联反应的聚酰亚胺树脂的制备与性能

为开发可低温固化的聚酰亚胺树脂, 通过分子结构设计将苯并噁嗪单元引入聚酰亚胺树脂中, 合成了含苯并噁嗪单元及乙炔基封端的双官能化新型聚酰亚胺预聚体(PIBzA). 经高温处理, 苯并噁嗪单元发生开环交联, 同时, 乙炔基端基发生三聚成环反应, 从而在固化树脂中形成双重交联网络结构. 苯并噁嗪单元的引入使聚酰亚胺树脂最快固化反应温度降低约32 ℃, 有效降低了固化温度. 同时, 苯并噁嗪单元的引入未大幅度降低树脂的耐热稳定性, 其玻璃化转变温度(T_g)介于266~290 ℃之间, 5%热失重温度(T_d,5%)接近500 ℃, 依然可以满足耐高温复合材料的应用需求. 此外, PIBzA固化树脂具有低介电特性, 其介电常数k介于2.3~3.0, 介电损耗介于0.002~0.008, 可满足透波复合材料及先进微电子封装材料的应用需求.     

细菌感染成像的研究进展

由致病菌或条件致病菌侵入机体繁殖而产生的毒素和其它代谢产物所引起的感染性疾病是目前全球范围内的主要死亡原因之一. 感染性疾病的早期诊断是对其进行有效治疗与控制的重要途径. 分子影像技术的快速发展给体内细菌感染的评估带来了前所未有的变化和机遇. 本文综合评述了计算机断层扫描、 正电子发射断层扫描、 超声成像、 磁共振成像、 荧光成像及光声成像等成像方式在细菌感染体内成像中的研究进展、 不足和发展方向等, 以期为活体细菌感染检测方法的发展提供参考.     

Mitochondrion-anchoring AIEgen with Large Stokes Shift for Imaging-guided Photodynamic Therapy

Photosensitizers that can target and accumulate in mitochondria are expected to achieve good therapeutic effects in photodynamic therapy,as mitochondria are the energy generation factory in cells.Herein,we designed and synthesized a novel mitochondrion-targeting photosensitizer TPC-Py with aggregation-induced emission characteristics for image-guided photodynamic therapy.TPC-Py possessed an efficient production of 1O2,with a quantum yield of 11.65%,upon mild white light irradiation(6 mW/cm²).TPC-Py exhibited good biocompatibility under dark condition,but showed remarkable cytotoxicity towards human cervical carcinoma(HeLa)cells with a half maximal inhibitory concentration(IC50)of 3.2μmol/L when exposed to white light irradiation(14.4 J/cm²).In addition,the Stokes shift of TPC-Py was as high as 150 nm,so that it could prevent self-absorption and increase the signal-to-noise ratio of fluorescence imaging.The excellent performance of TPC-Py makes it a promising candidate in imaging-guided clinical PDT for cancer in the near future.     

酰胺型冠醚液晶的合成及性质研究

冠醚液晶出现至今仅十几年，由于其具有冠醚和液晶的各种性质而受到人们的关注［‘－‘1．我们在已有工作的基础上，设计合成了5种酸胺型冠醚液晶分子（4—8），其中3种分子（4－6）具有液晶性．合成路线如下：1结果与讨论合成样品4－8经IR、MS、‘HNMR和元素分析确证其结构．用DSC和Texture图测定了4－6的液晶性质，其结果见图1．化合物7、8无液晶性，分子长径比分别为5．8：I，满足一般律状向列液晶分子长径比的要求．当在其分子链中增加1个苯环（5、6）时，分子的刚性链比例增大，整个分子的刚性增加，则具有液晶性．双臂型冠醚液…     

硫堇衍生化自组装膜修饰金电极的电化学性质及其对抗坏血酸的电催化氧化

将硫堇共价键合到自组装在金电极表面的半胱胺单分子层上,制成了衍生化自组装单分子膜修饰电极,并用电化学方法研究了它的电化学性质.循环伏安图显示其在pH＝7.7的磷酸盐缓冲液中,于－0.45～＋0.50V(vs.SCE)范围内有2对氧化还原峰.峰电位分别为E_pa¹＝214mV。E_pc¹＝82mV,E_pa2＝－75mV,E_pc2＝－160mV(vs.SCE).pH在5.0～9.0范围内,峰1有2个质子参与反应,峰2有1个质子参与反应.它的表面电子转移速率常数k_s＝0.02S^－1.此膜对抗坏血酸的氧化有催化作用,其氧化过电位较在裸金电极上降低了约250mV.催化电流与抗坏血酸的浓度在1.0×10^-6～4.0×10^-3mol/L范围内呈良好的线性关系.抗坏血酸催化氧化的异相速率常数为2.68×10^-3cm/s.     

高效毛细管电泳-电化学检测对外消旋氯霉素前体的拆分研究

用毛细管电泳-电化学检测法对外消旋苏式-2-氨基-1-对硝基苯基-1,3-丙二醇(氯霉素前体)进行了拆分研究．考察了影响检测及分离效果的实验参数,同时对其拆分机制进行了初步探讨．     

Structure of Cytochromec and Its Platinum-modified Derivatives by Fourier Transform Infrared Spectroscopy

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