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稀土离子激活的稀土氧化物和稀土硫氧化物的蓝、绿、红上转换发光与光谱特性 稀土离子激活的稀土氧化物和稀土硫氧化物的蓝、绿、红上转换发光与光谱特性
Science in China. Series B, Chemistry Pub Date : 2007-04-20 DOI: 10.1360/ZB2007-37-2-148
罗昔贤, 曹望和
{"title":"稀土离子激活的稀土氧化物和稀土硫氧化物的蓝、绿、红上转换发光与光谱特性","authors":"罗昔贤, 曹望和","doi":"10.1360/ZB2007-37-2-148","DOIUrl":"https://doi.org/10.1360/ZB2007-37-2-148","url":null,"abstract":"采用冷等静压预处理工艺合成了微细稀土硫氧化物上转换发光材料, 用该法合成的硫氧化物颗粒具有球形形貌、粒径分布均匀与发光亮度高的特点. 对Y 2 O 2 S:Yb,Tm(蓝色)、Y 2 O 2 S:Yb,Er(绿色)和Y 2 O 3 :Yb,Er(红色)三基色上转换发光材料的光谱特性进行了详细研究. 研究出了一种操作简便、亮度准确的测量上转换发光绝对亮度的新方法. 研究结果表明: 将Y 2 O 2 S:Yb,Tm, Y 2 O 2 S:Yb,Er, Y 2 O 3 :Yb,Er按适当比例混合, 可实现全色发光; Y 2 O 2 S和Y 2 O 3 基质中的Er 3+ 离子具有不同的上转换发光机理; Y 2 O 2 S:Yb,Er的绿色绝对发光亮度是Y 2 O 3 :Yb,Er的6.5倍; Y 2 O 2 S:Yb,Er发光粉在5.56 W/cm 2 功率密度(980 nm LD)激发下, 其发光亮度高达1100 cd·m -2 . 上述数据表明, 稀土硫氧化物是一种高效的上转换发光基质材料.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"1 1","pages":"148-155"},"PeriodicalIF":0.0,"publicationDate":"2007-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88638870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
纳米Fe 0 降解2,4-二氯酚的影响因素及其机理 纳米Fe 0 降解2,4-二氯酚的影响因素及其机理
Science in China. Series B, Chemistry Pub Date : 2007-02-20 DOI: 10.1360/ZB2007-37-1-82
程荣, 王建龙, Zhang Wei-xian
{"title":"纳米Fe 0 降解2,4-二氯酚的影响因素及其机理","authors":"程荣, 王建龙, Zhang Wei-xian","doi":"10.1360/ZB2007-37-1-82","DOIUrl":"https://doi.org/10.1360/ZB2007-37-1-82","url":null,"abstract":"采用化学还原法制备了纳米Fe 0 , 并研究了不同条件下纳米Fe 0 对2,4-二氯酚(2,4-DCP)的降解情况, 探讨了纳米Fe 0 降解2,4-二氯酚的反应途径. 结果表明, 纳米Fe 0 对2,4-二氯酚的去除作用包括吸附、脱氯、开环三种机制. 其中脱氯作用是一种界面反应, 发生在氯酚分子被吸附到Fe原子表面之后. 2,4-二氯酚可以脱去一个氯原子生成2-氯酚或4-氯酚, 也可以脱去两个氯原子生成苯酚. 随着氯酚初始浓度的增大, 其相对去除率略有降低, 但绝对降解量有较大提高. 温度不仅影响脱氯速率, 而且影响氯酚的去除途径. 温度较高时脱氯作用占主导地位, 先脱氯后开环, 温度较低时吸附作用占主导地位, 较易发生先开环后脱氯的情况.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"26 1","pages":"82-87"},"PeriodicalIF":0.0,"publicationDate":"2007-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87200863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DNA在Mg/聚2,6-吡啶二甲酸膜上的固定和杂交及其PAT基因片段的电化学阻抗谱测定 DNA在Mg/聚2,6-吡啶二甲酸膜上的固定和杂交及其PAT基因片段的电化学阻抗谱测定
Science in China. Series B, Chemistry Pub Date : 2007-02-20 DOI: 10.1360/ZB2007-37-1-36
焦奎, 杨涛, 杨婕, 冯媛媛
{"title":"DNA在Mg/聚2,6-吡啶二甲酸膜上的固定和杂交及其PAT基因片段的电化学阻抗谱测定","authors":"焦奎, 杨涛, 杨婕, 冯媛媛","doi":"10.1360/ZB2007-37-1-36","DOIUrl":"https://doi.org/10.1360/ZB2007-37-1-36","url":null,"abstract":"以静电吸附法使Mg 2+ 修饰于玻碳电极(GCE)上电聚合的2,6-吡啶二甲酸膜(PDC)上, 制得的Mg/PDC/GCE电极, 成为DNA固定及杂交的良好平台. 应用微分脉冲伏安法和电化学阻抗谱对DNA的固定和杂交进行表征. 以电化学阻抗谱免标记法检测目标DNA比以亚甲基蓝为指示剂的微分脉冲伏安法有更高的灵敏度. 固定于电极表面的DNA探针与互补单链DNA杂交后使电负性的[Fe(CN) 6 ] 3-/4- 的表面电子传递电阻值显著增大, 以此作为检测信号可以高灵敏度地测定目标DNA. 电化学阻抗谱检测转基因植物外源PAT基因片段, 线性范围为1.0×10 -9 ~ 1.0×10 -5 mol/L, 检测限为3.4×10 -10 mol/L.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"43 1","pages":"36-42"},"PeriodicalIF":0.0,"publicationDate":"2007-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82680452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SiO 2 大分子单体与苯乙烯共聚制备PS/SiO 2 纳米复合材料 SiO 2 大分子单体与苯乙烯共聚制备PS/SiO 2 纳米复合材料
Science in China. Series B, Chemistry Pub Date : 2007-02-20 DOI: 10.1360/ZB2007-37-1-25
欧宝立, 李笃信
{"title":"SiO 2 大分子单体与苯乙烯共聚制备PS/SiO 2 纳米复合材料","authors":"欧宝立, 李笃信","doi":"10.1360/ZB2007-37-1-25","DOIUrl":"https://doi.org/10.1360/ZB2007-37-1-25","url":null,"abstract":"利用过量的2,4-甲苯二异氰酸酯(TDI)对SiO 2 纳米粒子表面进行修饰合成出表面含—NCO基团的功能化SiO 2 (SiO 2 -TDI), 功能化SiO 2 与丙烯酸羟丙酯(HPA)反应将表面－NCO转化为可聚合乙烯基合成大分子单体(SiO 2 -HPA). 用传统自由基共聚方法利用苯乙烯(St)与SiO 2 大分子单体共聚制备PS/SiO 2 纳米复合材料. 系统研究了单体投料比及聚合时间对共聚反应的影响. 此外, 利用红外光谱(FTIR), DSC和TGA 等实验手段对纳米复合材料进行了表征分析. 结果表明: 共聚产物为一交联结构, SiO 2 纳米粒子在复合材料中起着物理交联点和化学交联点作用; 复合材料玻璃化转变温度( T g )明显地高于其均聚物玻璃化转变温度, 随着纳米SiO 2 含量的增加, 复合材料玻璃化温度升高.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"19 1","pages":"25-30"},"PeriodicalIF":0.0,"publicationDate":"2007-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84393314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
机械运动诱导的 111 In和 32 P核衰变速率变化 机械运动诱导的 111 In和 32 P核衰变速率变化
Science in China. Series B, Chemistry Pub Date : 2007-02-20 DOI: 10.1360/ZB2007-37-1-1
何裕建, 戚菲, 戚生初
{"title":"机械运动诱导的 111 In和 32 P核衰变速率变化","authors":"何裕建, 戚菲, 戚生初","doi":"10.1360/ZB2007-37-1-1","DOIUrl":"https://doi.org/10.1360/ZB2007-37-1-1","url":null,"abstract":"考察了外在的机械运动诱导的放射性核素 111 In的电子俘获衰变和 32 P的β衰变速率的变化. 结果表明, 在地球北半球的顺时针和逆时针圆周离心运动中(半径8 cm, 2000 r/min), 111 In电子俘获衰变的半衰期比文献值(2.83 d)分别降低2.83%和增加1.77%, 32 P的β衰变的半衰期比文献值(14.29 d)分别降低3.78%和增加1.75%; 当顺时针和逆时针圆周运动的转速增加为4000 r/min时, 111 In的半衰期分别降低11.31%和增加6.36%, 32 P的半衰期分别降低10.08%和增加4.34%. 当外在机械运动作用取消后, 放射性核素 111 In和 32 P的衰变速率均分别恢复到正常文献值. 发现外在圆周运动依赖顺时针和逆时针方向分别明显增加和降低 111 In和 32 P衰变过程的衰变速率, 并且其效应随圆周离心运动转速的增加而增加. 这些结果可能起因于不对称的力学作用.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"22 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2007-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73363982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sr含量对La 2- x Sr x NiO 4 ( x = 0.0~1.2)上NO分解的影响 Sr含量对La 2- x Sr x NiO 4 ( x = 0.0~1.2)上NO分解的影响
Science in China. Series B, Chemistry Pub Date : 2006-12-20 DOI: 10.1360/ZB2006-36-6-465
朱君江, 杨向光, 许雪莲, 魏可镁
{"title":"Sr含量对La 2- x Sr x NiO 4 ( x = 0.0~1.2)上NO分解的影响","authors":"朱君江, 杨向光, 许雪莲, 魏可镁","doi":"10.1360/ZB2006-36-6-465","DOIUrl":"https://doi.org/10.1360/ZB2006-36-6-465","url":null,"abstract":"研究了Sr含量对La 2 − x Sr x NiO 4 上氧化还原性能和NO分解的影响, 发现活性在 x = 0.6时达到最大值. TPD和TPR等的表征结果说明样品在 x = 0.6时具有比较匹配的氧化、还原能力, 从而使O 2 的脱附和NO的吸附变的相对容易, 提高了催化活性. 研究结果说明在 T 2 的脱附比较困难, 是NO分解反应的速控步骤; 随着反应温度的增加( T >700℃), O 2 的脱附变的容易, NO的活化吸附(NO + V o + Ni 2+ →NO − -Ni 3+ )成为反应的速控步骤. 氧空位的存在是NO分解的前提条件, 但氧空位的量与反应活性并不是呈正比关系.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"104 1","pages":"465-470"},"PeriodicalIF":0.0,"publicationDate":"2006-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80855814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
基于FKBP12结构的药物发现: L -1,4-噻嗪-3-羧酸衍生物的设计、合成及其神经营养活性 基于FKBP12结构的药物发现: L -1,4-噻嗪-3-羧酸衍生物的设计、合成及其神经营养活性
Science in China. Series B, Chemistry Pub Date : 2006-12-20 DOI: 10.1360/ZB2006-36-6-522
聂爱华, 肖军海, 王莉莉, 廖国超, 刘洪英, 任珅, 李松
{"title":"基于FKBP12结构的药物发现: L -1,4-噻嗪-3-羧酸衍生物的设计、合成及其神经营养活性","authors":"聂爱华, 肖军海, 王莉莉, 廖国超, 刘洪英, 任珅, 李松","doi":"10.1360/ZB2006-36-6-522","DOIUrl":"https://doi.org/10.1360/ZB2006-36-6-522","url":null,"abstract":"以神经亲免素FKBP12为靶点, 基于FKBP12, FK506与Calcineurin的复合物晶体结构, 设计、合成和筛选能够特异地靶向FKBP12的只具有促神经生长作用的功能而不影响免疫系统的新结构神经退行性疾病治疗药物. 结果显示化合物N308作为一种促神经生长和保护的候选药物具进一步开发的前景.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"1 1","pages":"522-533"},"PeriodicalIF":0.0,"publicationDate":"2006-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82287258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
基于纳米金/硫堇层层自组装的新型电流型酶-癌胚抗原免疫传感器 基于纳米金/硫堇层层自组装的新型电流型酶-癌胚抗原免疫传感器
Science in China. Series B, Chemistry Pub Date : 2006-10-20 DOI: 10.1360/ZB2006-36-5-425
袁若, 卓颖, 柴雅琴, 张英, 孙爱丽
{"title":"基于纳米金/硫堇层层自组装的新型电流型酶-癌胚抗原免疫传感器","authors":"袁若, 卓颖, 柴雅琴, 张英, 孙爱丽","doi":"10.1360/ZB2006-36-5-425","DOIUrl":"https://doi.org/10.1360/ZB2006-36-5-425","url":null,"abstract":"将Nafion 膜固定在金电极(Au)表面, 通过静电吸附和共价键合作用将硫堇(Thi)和纳米金颗粒(nano-Au)层层自组装到Nafion膜修饰的金电极表面. 再通过形成的纳米金单层吸附癌胚抗体(anti-CEA), 最后用辣根过氧化物酶(HRP)代替牛血清白蛋白(BSA)封闭电极上的非特异性吸附位点, 并同时起到放大响应电流信号的作用, 从而制得高灵敏、高稳定电流型酶-癌胚抗原(CEA)免疫传感器. 通过循环伏安和交流阻抗考察了电极表面的电化学特性, 并对该免疫传感器的性能进行了详细的研究. 该传感器对CEA检测的线性范围为2.5~80.0 ng/mL, 检测限为0.90 ng/mL.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"34 1","pages":"425-432"},"PeriodicalIF":0.0,"publicationDate":"2006-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77800504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
牛血清白蛋白影响聚氧乙烯-聚氧丙烯-聚氧乙烯嵌段共聚物胶团形成的荧光光谱研究 牛血清白蛋白影响聚氧乙烯-聚氧丙烯-聚氧乙烯嵌段共聚物胶团形成的荧光光谱研究
Science in China. Series B, Chemistry Pub Date : 2006-08-20 DOI: 10.1360/ZB2006-36-4-310
郭晨, 王靖, 梁向峰, 郑丽丽, 刘会洲
{"title":"牛血清白蛋白影响聚氧乙烯-聚氧丙烯-聚氧乙烯嵌段共聚物胶团形成的荧光光谱研究","authors":"郭晨, 王靖, 梁向峰, 郑丽丽, 刘会洲","doi":"10.1360/ZB2006-36-4-310","DOIUrl":"https://doi.org/10.1360/ZB2006-36-4-310","url":null,"abstract":"应用芘荧光光谱研究了牛血清白蛋白(BSA)对聚氧乙烯-聚氧丙烯-聚氧乙烯嵌段共聚物(PEO-PPO-PEO)Pluronic系列聚集行为的影响, BSA可以使Pluronic嵌段共聚物水溶液的临界胶团温度(CMT)增加. 应用“紧密堆积模型”获得了胶团形成过程中的标准自由能(Δ G 0 )、标准焓(Δ H 0 )和标准熵(Δ S 0 )等热力学参数, 胶团形成的标准焓和标准熵随着BSA浓度的增加而降低, 嵌段共聚物的PPO含量越高, 焓和熵的改变越大. 疏水的PPO嵌段是Pluronic嵌段共聚物与BSA作用的主要因素. PPO和BSA之间的疏水相互作用会引起PPO嵌段之间相互作用的改变, 进而使CMT升高和Pluronic嵌段共聚物胶团形成的热力学参数改变.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"268 1","pages":"310-316"},"PeriodicalIF":0.0,"publicationDate":"2006-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88394862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A a D d 型氢键流体的统计理论(II): 氢键网络的统计特征 A a D d 型氢键流体的统计理论(II): 氢键网络的统计特征
Science in China. Series B, Chemistry Pub Date : 2006-08-20 DOI: 10.1360/032005-99
王海军
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