Molecular Simulation Study of Alkyl monolayers on Si(Ⅲ） Surface

The structure of eight-carbon monolayers on the H-terminated Si(Ⅲ） surface was investigated by molecular simulation method.The best substitution percent 50% for octene or octyne-derived monolayer can be obtained using molecular mechanics calculation.And the densely packed,well-ordered monolayer on Si(Ⅲ） surfacec and be shown through energy minimization in the suitable-size simulation cell.     

Abnormal Fluorescence Behavior of Pyrene Functionalized Chitosan Films to Some Quenchers

Investigation of the fluorescence behavior of a pyrene functionalized chitosan film (PSC-CS) to some quenchers,including KI,CH3NO2 and Cu(NO3)2,has revealed that the monomer emission from the PSC-CS film increased rather than decreased,whereas the excimer emission decreased with the increase of time of duration after addition of KI or Cu(NO3)2.Both the increasing and decreasing processes could last as long as 20min to 40min,Unlike that observed in the system containing KI or Cu(NO3)2,for CH3NO2 system,both the monomer emission and the excimer emission increased with introduction of the quencher,but the excimer emission only started to increase after an hour-long induction period.The position of the excimer emission of the PSC-CS film did not change very much with addition of KI or Cu(NO3)2.However,addition of CH3NO2 made the excimer emission blue shifted for at least 20nm indicating formation of distorted excimers opr partially overlapped excimers.The fluorescence response of the film to external additions is sensitive but is low in selectivity.This property may make the film use as a novel sensing material for monitoring the purity of water.     

A Capillary Electrophoresis Detection Scheme for Water-soluble Vitamins Based on Luminol-BrO^- Chemilumlinescence System

A novel chemiluminescence detection scheme has been developed for detecting water-soluble vitamins following capillary electrophoresis(CE) separation.This detection was based on the inhibitory effect of vitamins on the CL reaction between luminol and BrO^- in basic aqueous solution.Detection of vitamins was accomplished with a borate-based background electrolyte at pH9.2.The luminol was used as a component of the separation carrier electrolytc.     

g-C3N4/ZnO复合光催化剂的制备及其光催化活性

以硝酸锌、三聚氰胺、氢氧化钠为原料,采用回流法合成g-C3N4/ZnO复合光催化剂.利用傅里叶红外光谱(FTIR),X射线衍射(XRD),扫描电子显微镜(SEM),紫外可见漫反射光谱(UV-Vis DRS)及N2吸附-脱附(BET)等技术对所合成样品的组成和形貌进行表征.在模拟太阳光条件下,以亚甲基蓝为模拟污染物评价催化剂的活性.结果表明,g-C3N4加入量为5wt;,煅烧温度500℃,煅烧时间2 h条件下制备的复合光催化剂具有最佳的光催化活性.5wt;g-C3N4/ZnO复合光催化剂在反应40 min时对亚甲基蓝的降解率可达到98.5;,其光催化降解速率为纯ZnO的2.8倍.     

基于MEMS光栅平动式光调制器信号处理分析

依据傅里叶光学理论,采用在频谱面上放置两种空间滤波器的方法进行信号处理,分析了光栅平动式光调制器在成像面上的强度分布情况,实现了对光能量的调制.分析表明：当滤出±1级谱时,像面上可以得到完全均匀的暗场;但是由于边框和悬臂梁的影响,得不到完全均匀的亮场;当滤出零频谱时,由于边框和悬臂梁的影响,得不到完全均匀的暗场和亮场.设计时,为了要在像面上得到更高的亮度均匀性,需要满足可动光栅栅条宽度为光栅周期的一半,同时应尽量减少悬臂梁和边框的宽度.     

导电硅橡胶理论研究进展

综述了导电硅橡胶的理论研究进展，包括导电通路的形成以及体系的电学性能。并讨论了该领域有待于入研究的问题。     

超高效液相色谱-飞行时间质谱法高通量筛查乳制品中20种镇静剂

利用超高效液相色谱/高分辨飞行时间质谱,结合数据库,建立了乳制品中20种镇静剂的高通量筛查方法。样品以乙腈和酸化乙腈沉淀蛋白质和脂肪,冷冻离心浓缩,经超高效液相色谱分离,采用电喷雾离子源,正离子模式,基质匹配法进行定量分析,可在9 min内对20种镇静剂进行高通量筛查和定量分析。镇静剂的质量浓度在1～500μg/L或5～1000μg/L范围内具有较好的线性关系,检出限为0.3～1.5μg/L,定量限为1～5μg/L。在5和50μg/L添加水平时,平均回收率为76.1%～108.2%,相对标准偏差为2.5%～9.0%。利用TargetAnalysis软件建立镇静剂数据库,并应用于加标样品的筛查分析。通过数据库比对,样品中添加的镇静剂被全部筛查出来,鉴定准确度达到了100%,保留时间偏差小于0.1 min,质量偏差小于3mDa,同位素峰形匹配度大于89.5%。利用本方法对购自超市的8个不同品牌的50余份乳制品进行了筛查分析,均未检出阳性样品。     

两种磺胺嘧啶锌配合物的合成、晶体结构和荧光性质(英文)

以磺胺嘧啶为配体,合成了两种新的Zn(Ⅱ)配合物[Zn(L)2(bpy)](1)and{[Zn(L)2(bpp)]}n(2)(L=磺胺嘧啶,bpy=2,2′-吡啶,bpp=1,3-二(4-吡啶基)丙烷)。并对其进行了单晶X-射线衍射,粉末X-射线衍射,元素分析,热分析,红外光谱,紫外光谱和荧光光谱测定。单晶X-射线分析表明化合物1是单核结构,属三斜晶系,P1空间群,Zn(Ⅱ)是四方锥配位结构。化合物2是一维结构,属单斜晶系,P21空间群,Zn(Ⅱ)是四面体配位结构。热分析表明化合物1和2都有很高的热稳定性。     

CMC-Na辅助磁性Fe3S4纳米复合物的合成及其吸附与吸波性质研究

以羧甲基纤维素钠(CMC-Na)为模板,采用简单温和的水热法制备了一种薄片状含碳Fe3S4纳米复合物,并探讨了反应时间和反应温度的影响。采用X射线衍射、扫描电镜、透射电镜、FT IR、振动磁强计和UV-Vis对材料进行了表征。结果表明,这种纳米复合材料在常温下具有较好的吸波性质和对污水中亚甲基蓝染料的吸附作用。     

吡蚜酮镍及铜配合物的合成、晶体结构与电催化性能研究

以吡蚜酮为配体合成了单核的镍配合物[Ni（L）₂（Ac）₂（H₂O）₂]·4H₂O（1）和双核的铜配合物[Cu₂（L）₂（Ac）₄]·2H₂O（2）（L=吡蚜酮）,并对化合物进行了元素分析、红外、热重、X射线衍射、循环伏安等分析。X-射线单晶衍射仪分析表明：化合物1属于三斜晶系,P1空间群,镍离子采用六配位的变形八面体几何构型。化合物2属于单斜晶系,P2₁/c空间群,两个醋酸根桥连相邻的Cu（Ⅱ）离子形成了双核结构。电催化实验发现化合物1和2对H₂O₂具有明显的电催化活性。