Multiple-State Storage Capability of Stacked Chalcogenide Films （Si16Sb33Te51/Si4Sb45Te51/Si11Sb39Te50） for Phase Change Memory

The multiple-state storage capability of phase change memory （PCM） is confirmed by using stacked chalcogenide films as the storage medium. The current-voltage characteristics and the resistance-current characteristics of the PCM clearly indicate that four states can be stored in this stacked film structure. Qualitative analysis indicates that the multiple-state storage capability of this stacked film structure is due to successive crystallizations in different Si-Sb-Te layers triggered by different amplitude currents.     

The Electrochemical Investigation of MEH-PPV in Ionic Liquid

Ionic liquids are a new kind of room-temperature molten organic salts. It can be used as solvents in the organic/polymeric syntheses, and some of them are called "green" solvents because of its recyclability1. Ionic liquids possess the superior properties, such as thermal stability up to 200(C, involatility and re-designability(for both cation and anion). The ionic liquid employed in this work is [bmim] [PF6]- ( butylmethylimidazolium hexafluorophosphate ) which is immiscible with water and h…     

Na＋-丙氨酸二肽络合离子结构的密度泛函理论研究

运用密度泛函理论B3LYP方法在6-311＋＋G**基组水平下研究了Na^＋与丙氨酸二肽(AD)分子结合形成的6种Na^＋-AD 络合离子, 其中包括2种双齿结构和4种单齿结构. 考察了6种Na^＋-AD络合离子的相对稳定性, 分析了丙氨酸二肽分子与Na^＋作用过程中分子骨架Ramachandran角f和Ψ以及分子内氢键的变化.     

一个新颖三维配位聚合物Pb(1，4-napdc)(DMF)的合成、结构及热稳定性研究

A novel 3D metal-organic coordination polymer Pb(1,4-napdc)(DMF) (1,4-napdc=naphthalene-1,4-dicarboxylate) was synthesized at room temperature using slow vapor diffusion method to grow single crystal that has been analyzed by X-ray diffraction. The crystal belongs to orthorhombic with space group P2₁2₁2₁. The unit cell parameters are as fellows: a=0.701 3(2) nm, b=1.407 6(3) nm, c=1.521 5(4) nm, V=1.501 8(6) nm³ and Z=4. In the crystal structure of Pb(1,4-napdc)(DMF), the square grids constructed with paddle-wheel units of Pb(Ⅱ) and 1,4-napdc links stack over each other to generate infinite 3D network, which has square apertures (1.158×1.158 nm²) along the crystallographic a-axis. The thermal stability of compound was investigated by differential scanning calorimetry and thermogravimetric analysis. CCDC: 293617.     

超声提取-超高效液相串联质谱分析沉积物中15种抗生素

在现有方法基础上对沉积物中磺胺类、喹诺酮类、大环内脂类和四环素类抗生素的提取、富集、净化以及仪器分析方法进行了优化。以EDTA-Mcllvaine缓冲溶液与乙腈(V:V,1:1)混合液作为提取液,利用超声波细胞破碎仪进行超声提取,串联强阴离子交换柱(SAX)和HLB固相萃取柱进行固相萃取(SPE),通过超高效液相/串联质谱(UPLC-MS/MS)测定沉积物中抗生素的含量。抗生素基质加标回收率在56.4%~110%,相对标准偏差为1.1%~24.3%,方法检出限0.0055~0.716 ng/g。本方法有效地提高了沉积物中抗生素的提取效率,并应用于实际样品的测定中。     

蛋白质荧光标记中协同效应的高效液相色谱

以牛血清白蛋白和胰岛素为研究对象, 经1,5-I-AEDANS衍生后, 采用高效液相色谱(HPLC)进行分离分析, 发现两者的衍生存在明显的协同作用.     

乙酰化淀粉的塑化和性能研究

以乙酰化改性淀粉为基体,甘油为增塑剂,利用哈克旋转流变仪密炼制备热塑性乙酰化淀粉.实验结果表明制备热塑性乙酰化淀粉的甘油/乙酰化淀粉配比应大于30/100(W/W),且随甘油含量增加,热塑性乙酰化淀粉的脆性降低.动态机械热分析(DMTA)显示热塑性乙酰化淀粉包含富甘油和富淀粉两相,乙酰化淀粉和甘油为部分互溶.流变学分析显示淀粉分子间作用力非常强,表现为类固态行为.同时本文对材料的热稳定性进行了初步研究.     

蓖麻毒素的间接酶联免疫快速检测

建立了间接酶联免疫法快速检测蓖麻毒素的方法。方法的线性范围在0.08~1.25 mg/L之间,相关系数r=0.992 3,检出限为0.02 mg/L。将该法用于检测实际水样、土壤、奶粉和血液蓖麻毒素加标样品,回收率在60%~98%范围。该方法简单、快速、假阳性率低,非常适合蓖麻毒素的快速筛选、定性和半定量分析。     

联吡啶铁/H2O2体系在可见光下降解芥子气模拟剂2-CEES

采用联吡啶铁/H2O2体系在可见光照射条件下(λ>450nm)降解芥子气模拟剂2-氯乙基乙基硫醚(2-CEES).考察了不同反应条件下的降解效果,通过EPR分析确定了反应过程中产生的高活性物种,利用GC-MS和NMR等方法分析了反应的产物,跟踪了反应过程中TOC的变化,并根据结果对2-CEES光催化降解的反应机理进行了探讨.     

七(2,3-二-O-乙酰基-6-O-叔丁基二甲基硅烷基)-β-环糊精毛细管色谱柱的研制及色谱性能

合成了七（2，3-二-O-乙酰基-6-O-叔丁基二甲基硅烷基）-β-环糊精，并采用静态法成功地将其涂渍到弹性石英毛细管柱上。研究了其气相色谱分离性能，发现此固定相涂渍性好，柱效较高，热稳定性好，对卤代芳烃异构体以及难分离的二取代苯的位置异构体具有良好的分离能力。