反应温度对蒙脱石载银量及其缓释性能的影响

以钠基蒙脱石(Na-MMT)为载体,氧化银与氨水反应形成的银氨络合物[Ag(NH₃)₂OH]为前驱体,通过离子交换和三乙醇胺(TEA)还原两步法制备了载银蒙脱石(Ag-MMT)。 用佛尔哈德法测定了载银蒙脱石(Ag-MMT)的载银量,探讨了反应温度对MMT 载银量及其缓释性能的影响,并用FI-IR、XRD等技术手段对Na-MMT和Ag-MMT的结构进行了表征。 结果表明,在蒙脱石与Ag⁺的质量比为20:1、离子交换时间为1 h、反应温度50 ℃,然后再加入三乙醇胺和聚乙烯吡咯烷酮,50 ℃下反应2 h,MMT的载银量最大,银的利用率达到86.89%,释放时间最持久,并且MMT的层状结构没有被破坏。     

Structure Analysis of Needle-like Copper Tantalum Trisulfide Crystals by XPS and Raman Spectroscopy

High-quality needle-like CuTaS3 single crystals have been synthesized through a chemical vapor transport(CVT)process.Crystallographic data show the special double chains of edge-sharing TaS6 octahedra....     

低通量慢中子对Bi系超导体的辐照效应

本文研究低通量慢中子对Bi系超导体的辐照效应。实验结果表明:(1)Bi系超导体在适量慢中子辐照后,临界电流密度J_c和零电阻温度T_c0都有不同程度提高;(2)低通量慢中子和高通量快中子对Bi系超导体具有相似的辐照效应。 关键词：     

蓝宝石整流罩光学加工建模研究

采用了面向对象的Petri网(Object-Oriented Petri Net,OOPN)作为建模方法对蓝宝石整流罩的光学加工过程进行研究,通过对加工过程的分析,以对象化的方式进行封装,建立了OOPN模型并进行了性能分析,证明利用该方法建模可以充分发挥面向对象技术和petri网原理的优点,做到简化流程,便于分析,易于扩展和复用,为光学等特殊加工过程的建模和分析提供了一种思路。     

基于咔唑-靛红双-硫代碳酰腙衍生物的NMR研究

采用多种核磁共振（NMR）技术（包括¹H NMR、¹³C NMR、¹H-¹H COSY、¹H-¹³C HSQC、¹H-¹³C HMBC），对基于咔唑-靛红双-硫代碳酰腙新型衍生物2，即1-[（3Z）-2-氧代吲哚-3-亚基]-5-[（9-己基-3-咔唑基）亚基]硫代碳酰腙的¹H和¹³C NMR信号进行了全归属，确定了其结构．     

基于表面等离子体子共振成像技术研究苏拉明和顺铂对肝癌细胞生长的抑制作用简

基于表面等离子体子共振成像(SPRi)技术提出了一种实时、非标记的新型抗癌药物药效评估方法. 以聚二甲基硅氧烷(PDMS)为材料,制作了包含微柱结构的微流控芯片作为流通反应池,配合自行设计组装的SPRi生物传感器完成肿瘤细胞的特异性捕获及检测,研究了苏拉明和顺铂对肝癌细胞HepG2的生长抑制作用. 同时引入辅助验证实验,即采用常规八肽胆囊收缩素(简称CCK-8)法测定上述药物对肝癌细胞增殖的抑制作用. SPRi检测结果表明,苏拉明和顺铂能抑制肿瘤细胞HepG2增殖并呈现剂量、时间依赖关系.     

冰冻人血清中尿酸标准物质复制的定值EI北大核心CSCD

为了满足该标准物质的需求,进行了第二次尿酸血清标准物质的复制。针对复制的尿酸血清标准物质,基于单四极杆质谱的液相色谱-同位素稀释质谱法(LC-IDMS),用乙腈沉淀法去除蛋白质,BEH C18色谱柱和电喷雾离子源负离子模式(ESI^(-)),同位素稀释的单点校准法进行定值、均匀性检验、稳定性检验以及不确定度评定等研究。此定值方法经过CCQM-K109(血清中尿酸分析)国际关键比对进行验证。复制的2种不同浓度水平尿酸(肾病患者和正常人)血清标准物质的定值结果分别为(73.5±1.3)μg/g,(47.5±1.1)μg/g,其均匀性和稳定性评估结果良好。     

Polyamide Nanofiltration Membrane from Surfactant-assembly Regulated Interfacial Polymerization of 2-Methylpiperazine for Divalent Cations Removal

Removal of metal ions from water can not only alleviate the scaling problem of domestic and industrial water, but also solve the water safety problem caused by heavy metal ion pollution. Here, we fabricate a positively charged nanofiltration membrane via surfactant-assembly regulated interfacial polymerization(SARIP) of 2-methylpiperazine(MPIP) and trimesoyl chloride(TMC). Due to the existence of methyl substituent, MPIP has lower reactive activity than piperazine(PIP) but stronger affinity to hexane, resulting in a nanofiltration(NF) membrane with an opposite surface charge and a loose polyamide active layer. Interestingly, with the help of sodium dodecyl sulfate(SDS) assembly at the water/hexane, the reactivity between MPIP and TMC was obviously increased and caused in turn the formation of a positively charged polyamide active layer with a smaller pore size, as well as with a narrower pore size distribution. The resulting membrane shows a highly efficient removal of divalent cations from water, of which the rejections of MgCl₂, CoCl₂ and NiCl₂ are higher than 98.8%, 98.0% and 98.0%, respectively, which are better than those of most of other positively charged NF membranes reported in literatures.     

Removal of Anionic Dyes from Aqueous Solution with Layered Cationic Aluminum Oxyhydroxide

It is highly desired yet challenged to find an adsorbent with low cost and excellent performance in the removal of organic dyes from aqueous solution. Here we reported that a layered cationic aluminum oxyhydroxide material hydrothermally synthesized from the low-cost source materials of AlCl₃∙6H₂O, CaO and H₂O, known as JU-111, can meet such criterion in removing methyl orange(MO) and Congo red(CR). JU-111 shows fast adsorption kinetics[especially for CR(15 s)] and high adsorption capacity(MO:>1000 mg/g; CR:>2900 mg/g), surpassing most of the reported adsorbents. Comprehensive characterizations of the adsorption process of MO and CR revealed that both adsorptions were achieved via the anion exchange process. The characteristics of extremely low cost and excellent performance render JU-111 great potential in the practical applications in the removal of anionic dyes.