溶剂热插层法制备荧光石墨相氮化碳量子点及其在Fe3+检测中的应用

利用溶剂热法, 基于氢氧化钾的插层作用制备了荧光氮化碳量子点(g-C₃N₄ QDs). 所获得的氮化碳量子点具有良好的水溶性和荧光稳定性. 透射电子显微镜(TEM)照片显示, 氮化碳量子点的粒径约为2.3 nm; X射线光电子能谱(XPS)和红外光谱(FTIR)结果表明, 氮化碳量子点表面存在大量的亲水基团; 荧光发射光谱(PL)结果表明, 氮化碳量子点具有激发波长依赖性. 基于三价铁离子(Fe³⁺)对荧光氮化碳量子点荧光的猝灭现象, 构建了一种用于检测Fe³⁺的荧光传感器, 在Fe³⁺浓度为5~100 μmol/L范围内, 检测体系表现出良好的线性关系, 检出限约为0.5 μmol/L, 实现了对Fe³⁺的高效、 灵敏、 选择性检测.     

(2R)-莰烷磺内酰法合成红褐林蚁和多点林蚁哟虫信息 素的主要组分3-乙基－4 －甲基戊酸甲酯

以(2R)-莰烷磺内酰胺为手性助剂,经不对称Michale加成、断裂等简单步骤合成红褐林蚁和多点林蚊尾虫信息(3R)和(3S)-3-乙基－4－甲基戊酸甲酯(1),该合成的对映异构体纯度均达94％e.e.以上,另外其关于中间体(3'R)－N'－3'-乙基-4-甲基戊酰基莰烷-10,2-磺内酰胺的单晶结构进行了报道,并讨论了在有或无CuBr·Me~2时Michael加成反应的机理。     

Investigation of europium(Ⅲ)-doped ZnS for immunoassay

Biofunctional europium(Ⅲ)-doped ZnS(ZnS:Eu) nanocrystals are prepared by a sol–gel method. The characteristic luminescence of ZnS:Eu is used as a probe signal to realize sensitive immunoassay. The luminescence intensity of the Eu~(3+) in the ZnS matrix shows strong concentration dependence, and the optimal doping concentration is 4%. However,the emission wavelengths of the ZnS:Eu nanocrystals are not dependent on doping concentration nor the temperature(from 100 K to 300 K). Our results show that these features allow for reliable immunoassay. Human immunoglobulin, used as a target analyte, is captured by antibody modified ZnS:Eu probe and is finally enriched on gold substrate for detection.High specificity of the assay is demonstrated by control experiments. The linear detection range is 10 nM –800 nM, and the detection limit is about 9.6 nM.     

硫酸钡粒径调控剂C-N-CDs的制备、应用及机理

通过柠檬酸与乙二胺水热反应制备羧基、氨基修饰碳点(C-N-CDs),其具有优异的硫酸钡粒径调控作用：可使沉淀法制备的BaSO₄颗粒平均粒径减小到45.3 nm,小于同等条件下传统配位剂乙二胺四乙酸(EDTA)调控制备的BaSO₄颗粒平均粒径(73.7nm)。将所制备的纳米BaSO₄样品添加进聚乙烯醇(PVA)薄膜中可增强薄膜的力学性能。研究发现C-N-CDs的化学性能、表面电性、空间位阻是影响BaSO₄粒径大小的重要因素。     

Coherent interaction and action-counteraction theory in small polaron systems,and ground state properties

Based on the coherent interaction and action-counteraction principles, we investigate the ground state properties for small polaron systems, the coherent-squeezed fluctuation correction, and the anomalous lattice quantum fluctuation, with the new variational generator containing correlated squeezed-coherent coupling and quantum entanglement. Noting that $-2t $ is the T.B.A. energy, for the coherent interaction effect, we find the ground-state energy $E_0$ to be $-2.428t$, in which the coherent squeezed fluctuation correction $-A_0 t$ is $-0.463t $ (where $ t $ is the hopping integral, $\omega $ is the phonon frequency), with the electron-one-phonon coupling constant $g=$1 and the electron-two-phonon coupling constant $g_{1}=-0.1$. However, as a result of the action-counteraction effect, $\tilde{{E}}_{0} $ is $-2.788t$, but $-\tilde{{A}}_{0} t$ is $-0.735t$. As to the polaron binding energy $(E_{\rm P} )$, for the coherent interaction effect, $E_{\rm P} $ is $-1.38\omega $, but for the action-counteraction effect, $\tilde{{E}}_{\rm P}$ is $-1.88\omega $. In particular, the electron-two-phonon interaction noticeably enlarges the coherent interaction and the coherent squeezed quantum fluctuation correction. By intervening with the quantum entanglement, the evolutions of the squeezed coherent state and the lattice quantum fluctuation begin to take control. At that time, we encounter a new quantum phase coherence phenomenon — the collapse and revival of inversion repeatedly for the coherent state in the entangled evolution.     

Synthesis and Structure of Copper(Ⅱ) Complex [Cu(C_5H_5N)_2(H_2O)(C_6H_5COO)_2]

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Synthesis and Crystal Structure of 13-Phenyl-1,10- dithia-4,7-dioxa-13-aza-15-Crown-5

1　ＩＮＴＲＯＤＵＣＴＩＯＮＣｒｏｗｎａｎｄａｚａｃｒｏｗｎｅｔｈｅｒｈａｖｅｂｅｅｎｕｓｅｄｗｉｄｅｌｙａｓｈｏｓｔｓｆｏｒｒｅｃｏｇｎｉｚｉｎｇｇｕｅｓｔｍｅｔａｌｉｏｎｓ.[1～ 4] Ｔｈｉａｃｒｏｗｎｅｔｈｅｒｓｉｎｃｏｒｐｏｒａｔｉｎｇｏｎｌｙｓｕｌｆｕｒａｔｏｍｓｉｎｒｉｎｇａｌｓｏｈａｖｅｂｅｅｎｓｔｕｄｉｅｄａｓｅｘｔｒａｃｔｉｎｇｒｅａｇｅｎｔｓｆｏｒｓｏｍｅｓｏｆｔｍｅｔａｌｉｏｎｓ.[5] Ｏｎ ｌｙｆｅｗｓｔｕｄｉｅｓｏｎｍｉｘｅｄ ｄｏｎｏｒｃｒｏｗｎｅｔｈｅｒｃｏｎｔａｉｎ ｉｎｇ…     

金川露天矿高边坡的反射地震CT探测研究

高边坡的岩体结构和稳定性研究是工程地质研究的一个重要课题。本次探测使用高分辨率数字地震仪和反射地震CT方法,对金川露天矿高边坡的岩体结构进行了深入细致的探测与研究,清楚地揭示了边坡岩体中优势结构面的产状和组合关系,以及边坡表层松动带厚度分布,未发现顺坡软弱岩层。     

面向组装的小批量生产工序管控系统研究

为解决多品种小批量生产模式企业生产脱离工艺与质量管控的问题,自主开发了面向组装作业的小批量生产工序管控系统;通过结合可视化工艺系统,并采用人机交互技术、无线射频识别技术、传感器技术、数据检测与采集技术实现了组装作业的可视化指导、批量生产管理、关键工序严格受控、检测数据实时记录、产品信息可追溯的目标;确保了生产工艺得到完全落实,产品质量得到严格把控。     

Mn3O4多面体纳米晶体的制备及其电化学性能

通过对未加添加剂的醋酸锰-乙醇体系的一种简易的水基热解过程,制备了Mn3O4多面体纳米晶体。借助X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱法(FTIR)、拉曼光谱和X-射线光电子能谱(XPS)等对Mn3O4的结构和形貌进行了表征。提出了Mn3O4多面体纳米晶体的形成机理。循环伏安法(CV)测试结果表明,所制得的Mn3O4电极呈现良好的赝电容性能。在扫描速率为5 mV.s-1时,得到了Mn3O4的最大比电容值173 F.g-1。